424-60

Specification No. 424-60

CONTENTS SECTION TITLE

1.0 SCOPE 2.0 RATINGS AND CAPABILITY 3.0 INSULATING OIL 4.0 TRANSFORMER COILS 5.0 TANKS AND RELATED ACCESSORIES 6.0 LOAD-TAP-CHANGER (LTC) 7.0 GROUNDING PROVISIONS 8.0 OIL PRESERVATION SYSTEM 9.0 COOLING EQUIPMENT

10.0 BUSHINGS 11.0 SURGE ARRESTERS 12.0 CURRENT TRANSFORMERS ON THE TRANSFORMER 13.0 OTHER TRANSFORMER INDICATION, ALARM AND RELAY DEVICES 14.0 CONTROL CABINET 15.0 AUXILIARY WIRING 16.0 TRANSFORMER NAMEPLATE 17.0 TRANSFORMER TESTING 18.0 TRANSFORMER LOSS EVALUATION 19.0 AC STATION SERVICE AUXILIARY TRANSFORMERS 20.0 CIRCUIT BREAKER 21.0 DIFFERENTIAL AND OVERCURRENT RELAYING AND METERING 22.0 VOLTAGE TRANSFORMERS AND METERING FACILITIES 23.0 PHASE, DESIGNATION, ROTATION, COMPARISON AND MARKING 24.0 SWITCHES AND MOTORIZED OPERATOR 25.0 SEMI-TRAILER 26.0 GENERAL CONSTRUCTION REQUIREMENTS 27.0 CPS INSPECTION, TEST AND ACCEPTANCE 28.0 DRAWINGS, MANUALS, EXCITATION CURVES AND TEST REPORTS 29.0 ENVIRONMENTAL 30.0 WARRANTY 31.0 PROPOSAL INFORMATION REQUIRED FROM MANUFACTURER 32.0 MANUFACTURER’S CHECKLIST 33.0 MANUFACTURING PROCESS AND UNUSUAL EVENT OR DAMAGE 34.0 MANUFACTURING DEFICIENCIES AND EXPENSE REIMBURSEMENT 35.0 COMMUNICATIONS, TRANSACTIONS AND DOCUMENTATION 36.0 DESIGN REVIEW 37.0 REQUIREMENTS AND PROCEDURES FOR PRODUCT AND

MANUFACTURER APPROVAL 38.0 SHIPPING INSTRUCTIONS 39.0 GENERAL INSTRUCTIONS

Appendix A PROPOSAL DATA SHEET Appendix B MANUFACTURER’S CHECKLIST Drawings

CPS Specification No. 424-60 Approved: November 18, 2004 Page 1

1.0 SCOPE 1.1 Application. This specification covers the minimum electrical and mechanical requirements for a three-phase, 60 hertz, load-tap-changing, Mobile Unit Substation. The mobile unit substation is to be mounted on a semi-trailer and shall include a 138,000 volt transformer, 138 KV switching equipment, secondary breaker, low voltage switching equipment, control power transformers, instrument transformers, and associated relaying. 1.2 Applicable Standards. The transformer shall be designed in accordance with ANSI C57, although mobile unit substation transformers are not specifically covered. Equipment covered by this specification shall comply with the national standards listed below except where they conflict with this specification. The order of precedence shall be the requirements of this specification, then the following standards: ANSI C37.06-1979(R2000); AC High-Voltage Circuit Breakers Rated on Symmetrical Current Basis-Preferred Ratings and Related Required Capabilities IEEE C57.12.00-2000; General Requirements for Liquid-Immersed Distribution, Power and Regulating Transformers ANSI C57.12.10-1997; Transformers- 230 kV and Below 833/958 through 8333/10,417 kVA, Single-Phase, and 750/862 through 60,000/80,000/100,000 kVA, Three-Phase without Load Tap Changing; and 3750/4687 through 60,000/80,000/100,000 kVA, with Load Tap Changing-Safety Requirements IEEE C57.12.70-1978 (R2001); Terminal Markings and Connections for Distribution and Power Transformers IEEE C57.12.80-1978 (R2002); Terminology for Power and Distribution Transformers IEEE C57.12.90-1999; Test Code for Liquid-Immersed Distribution, Power, and Regulation Transformers and Guide for Short-Circuit Testing of Distribution and Power Transformers IEEE C57.13-1978 (R1993); Requirements for Instrument Transformers IEEE C57.19.00-1991; General Requirements and Test Procedure for Outdoor Power Apparatus Bushings IEEE C57.19.01-2000; Performance Characteristics and Dimensions for Outdoor Apparatus Bushings IEEE C57.91-1995; Guide for Loading Mineral-Oil-Immersed Power Transformers


IEEE C62.11-1993(R1999); Metal-Oxide Surge Arresters for AC Power Circuits ASTM A153-95(R2003); Specification for Zinc Coating (Hot-Dip) on Iron and Steel Products ASTM D3283-92(R1998); Air as an Electrical Insulating Material ASTM D3487-93(R2000); Mineral Insulating Oil Used in Electrical Apparatus NEMA TR1-1993(R2000); Transformers, Regulators and Reactors NIST Technical Note 1204; Calibration of Test Systems for Measuring Power Losses of Transformers SSPC-Steel Structures Painting Manual; Volume 1 (1993) Good Painting Practice and Volume 2 (1995) Systems and Specifications Federal Specification A-A-50553; Fittings for Conduit, Metal, Rigid (Thick-wall and Thin-wall (EMT) type) ASTM A36-2004; Standard Specification for Carbon Structural Steel ASTM A 325-2004; Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 KSI Minimum Tensile Strength ASTM A 529-2004; Standard Specification for High-Strength Carbon-Manganese Steel of Structural Quality ASTM A 572-2004; Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel ASTM A 242-2004; Standard Specification for High-Strength Low-Alloy Structural Steel ASTM A 588-2004; Standard Specification for High-Strength Low-Alloy Structural Steel with 50 KSI (345 MPA) Minimum Yield Point to 4-IN. (100-MM) Thick ASTM A 514-2004; Standard Specification for High-Yield-Strength, Quenched and Tempered Alloy Steel Plate, Suitable for Welding 1.3 Semi-Trailer. Semi-Trailer shall be in accordance with the “Texas Department of Transportation, Austin, Texas, Regulations for oversize, overweight, permits” of latest issue. Requirements of the Texas Department of Transportation shall take precedence over the requirements of this specification.


1.4 Applicable CPS Specifications. The following CPS specifications apply to equipment included as part of this specification.

CPS Specification No. Title

420-08 Transformers, Voltage, Outdoor Type, 5 kV, 15 kV and

34.5 kV Class

680-07 Breaker, Circuit, Outdoor, Oil less, 15.5 KV

681-02 Switch, Disconnect, 138 KV Vertical Break, Three-Pole, Group Operated

681-05 Switch, Fault-Initiating, High-Speed, Single-Pole, 138 KV

681-06 Operator, Motorized, For 138 KV and 345 KV Disconnect

Switches

781-06 Bushing, Power Transformer

814-04 Transducers, Watt, Var, Volt, and Amp

000-01 Requirements and Procedures for Product/Manufacturer Approval

1.5 Mobile Unit Substation Covered By This Specification.

CPS Material No. Description

9003500 TRANS POWER MOBILE UNIT SUBSTATION 40MVA 138,000 DELTA TO 13,800GRDY/7,967 VOLT

9003502 TRANS POWER MOBILE UNIT SUBSTATION 60MVA 138,000 DELTA TO 36,000GRDY/20,783 VOLT

2.0 RATINGS AND CAPABILITY 2.1 MVA Rating. The transformer shall be capable of continuous operation at the MVA rating listed in the table below without exceeding 95°C average winding rise by resistance with no additional loss of life expectancy, when the ambient temperature does not exceed 40°C and the twenty-four hour average ambient temperature does not exceed 30°C. No component of the transformer, including the load-tap-changer, shall limit the capability to a value less than that specified above.


CPS Material No. Capacity (95° Rise)9003500 40 MVA 9003502 60 MVA

2.2 Voltage Ratings (Grounded Neutral System).

2.2.1 High Voltage. 138,000 Volts Delta 2.2.2 Low Voltage.

CPS Material No. Low Voltage

9003500 13,800/7,967 Volts Grounded Wye 9003502 36,000/20,783 Volts Grounded Wye

2.3 Full-Wave Impulse Level and BIL Level– kV Crest

CPS Material No.

138 kV Line (H)

36 kV Line (X)

13.8 kV Line (X)

Neutral (X0)

9003500 450 150 110 9003502 450 200 110

2.4 Impedance. The manufacturer shall design the transformer to the lowest impedance practical within good design criteria. In no case shall the impedance exceed 20% and shall not vary from the impedance stated in the proposal outside the tolerance as allowed in ANSI standards. 2.5 Sound Level. The audible sound level shall not exceed 75 dBA at the full rating. 3.0 INSULATING OIL The insulating oil will be Virgin Type II inhibited mineral oil manufactured from naphthenic base crudes in accordance with ASTM Standard D3487. Distillates from these crudes may be acid refined, hydrogen treated, solvent extracted, or processed by other suitable refining methods. This oil will contain no more than 0.3% of 2,6 Ditertiary-Butyl Para-Creosol or 2,6 Ditertiary-Butyl Phenol oxidation inhibitor and will be so stated in the manufacturer code. The oil will be free of any matter or contaminants, which may be injurious to insulation, paint, varnish, metal, and/or other parts of the transformer. 4.0 TRANSFORMER COILS 4.1 Conductors. Rectangular copper conductors with rounded edges shall be used on all coils.


4.2 Windings. Single or multi-strand disc or multi-strand helical windings are preferred. The winding cylinders and radial spacers shall be precompressed high-density material. The radial spacers shall have rounded edges. The conductor shall not be spliced within the winding. 4.3 Winding Insulation. All coil and lead conductors shall be insulated with “Nomex” insulation material. No conductors or any coils shall be insulated with only a “dipped” or “sprayed- on” insulation. The insulation shall be stored and installed in an environmentally controlled clean room where the air is filtered and dried. The windings shall be fabricated and stored in an environmentally controlled clean room. (Note: If a separate clean room is not available, CPS may waive this requirement after review of the manufacturer’s facility to insure that the intent of the specification is met.) 4.4 Coil Clamping. The windings shall be supported top and bottom by a full size (at least the size of the coils) coil clamping system that uses solid, high density, insulating coil-clamping rings. The clamping rings shall be of sufficient size to restrain the short circuit and static pressures and to give full radial spacer support for even clamping pressure to all areas of the coils. 4.5 Core and Coil Inspection. CPS reserves the right to inspect the core and coil assembly and the tank itself immediately prior to the tanking of the core and coil assembly. Should CPS elect to perform the inspection, the manufacturer shall provide transportation and accommodations and cover all other reasonable expenses for two CPS inspectors. 5.0 TANKS AND RELATED ACCESSORIES 5.1 Design Pressure. The main transformer tank and any attached compartment that is subjected to operating pressures shall be designed to withstand, without permanent deformation, pressure 25 percent greater than the maximum operating pressures. 5.2 Vacuum Filling. Tanks, radiators and the LTC compartment shall be designed for vacuum filling at full vacuum in the field. Auxiliary compartments, when not designed for vacuum filling, shall be so designated and valves shall be provided to isolate them from the main transformer tank. Specific instructions concerning vacuum procedures shall be provided in the instruction manual. 5.3 Vacuum Flange. Both the main tank and LTC compartment shall have a 4-inch cover-mounted vacuum hose connection with flange and bolted cover plate. Flange and cover plate shall have an 8-hole, 7 1/2-inch bolt circle for 5/8-inch diameter bolts. Suitable isolation shall be provided between this opening and the oil filling inlet. On the LTC compartment a 2-inch to 4-inch adapter will be acceptable. 5.4 Pressure Relief Device. The main transformer tank and the LTC compartment shall each be equipped with a mechanical pressure relief device. Each device shall have


electrical alarm contacts and a mechanical flag to indicate operation. Paralleled alarm contacts shall provide a signal to the annunciator panel and be wired to terminal points in the control cabinet. 5.5 Valves. The transformer main tank shall be equipped with one (1) lower valve and one (1) upper valve. The tap-changing compartment shall be equipped with one (1) lower valve and one (1) upper valve. The lower valves shall allow oil to be drained from the extreme bottom of the transformer main tank and the tap-changing compartment. All valves shall be free of obstructions. All valves shall be globe design constructed of stainless steel, bronze or brass with flanged inlet and a threaded 2-inch NPT outlet. All valves shall be Milwaukee Type 506-201 without the sampling device. All valves shall have a rating of 300 WOG (water, oil, and gas). A plug made of the same material as the valve body shall be installed on each valve. All seals, sealants and gasket materials associated with the valves shall be compatible with mineral oil. 5.6 Transformer Tank Cover. A non-skid surface shall be installed on the transformer tank cover. This surface shall be an integral part of the paint used on the tank cover. Materials installed with an adhesive tape are not acceptable. 5.7 Manholes. One or more manholes shall be provided on the transformer tank cover. The manhole(s) shall have removable bolted covers with a minimum diameter of 18 inches. Manhole covers weighing more than 45 pounds shall be hinged. All manhole covers shall have handles. 5.8 Gaskets. All joints for manhole covers, bushings and other bolted covers shall be gasketed. These joints shall be designed so gaskets will not be exposed to the weather and shall be provided with mechanical stops to prevent crushing. Three (3) sets of gaskets shall be provided with each transformer: one set for shipment, one set for final installation, and one spare set. All gaskets shall be made of BUNA-N gasket material with durometer hardness ("A" Scale) 60 or 70. 5.9 Lifting Facilities. Lifting means shall be provided for removing the cover and untanking the transformer. The bearing surfaces of the lifting means shall be free from sharp edges. 5.10 Warning Lights. Two (2) red warning lights visible from 360° radius of the unit shall be provided to automatically provide an indication whenever the mobile substation unit is energized. 6.0 LOAD-TAP-CHANGER (LTC) 6.1 Load-Tap-Changer Placement. The transformer shall be equipped with an automatic load-tap-changer located either on the high-voltage windings or the low volatage windings.


6.2 Load-Tap-Changer Voltage Regulation. The LTC shall use line drop compensation to regulate the low voltage. The LTC shall provide 20% voltage regulation, 10% above and 10% below rated secondary voltage, in thirty-two (32) 5/8% steps. The LTC shall deliver rated MVA at the seventeen (17) positions that are at or above rated voltage and shall deliver rated low-voltage current at the sixteen (16) positions below rated voltage.

6.2.1 Load-Tap-Changer Design. The LTC shall be an MR Reinhausen with the required current rating. The tapped LTC windings shall be separate layer or disc-type windings and shall be constructed to distribute the minimum unbalance for minimum short circuit forces. Copper conductors shall be of sufficient thickness to prevent them from climbing over adjacent strands. A Reinhausen vacuum interrupter monitoring system with type RMV monitoring circuit board model B shall be provided. The monitoring scheme shall interrupt and lock-out the LTC when the scheme senses vacuum bottle failure. The scheme shall include alarm contacts, a failure indicating lamp and a reset button. The failure-indicating lamp shall be located in the control cabinet. The reset button shall be located near the LTC motor drive. Alarm contacts shall provide a signal to the annunciator panel and be wired to terminal points in the control cabinet.

6.2.2 Housing. The LTC switching mechanisms shall be housed in a separate compartment mounted on the transformer tank and shall be designed to prevent any interchange of oil between the LTC compartment and the transformer tank. The LTC compartment shall be provided with hinged inspection openings. 6.2.3 Voltage Regulating Relays. A Beckwith Electric Company Model M-2001C6SLAA digital tap-changer control relay with a Model M-2067 adapter panel and a Beckwith Electric Company Model M-0329A LTC backup control relay shall automatically control the LTC. The M-0329A LTC backup control relay shall provide “first customer protection” as specified in the M-0329A instruction book. Circuit breakers shall isolate and protect the voltage regulating relays. Fuses are not allowed. Alarm contacts from the LTC backup control shall provide a signal to the annunciator panel and shall be wired to terminal points in the control cabinet. 6.2.4 Sensing Potentials. Nominal 120 volt rms sensing potentials from two different phases of the voltage transformers of Section 22.3, one phase potential for the tap-changer control relay and the other phase potential for the LTC backup control relay, shall be wired to the LTC.

6.2.5 Series Connected Contact Provision. A series connected auxiliary “a” contact

from the secondary cabinet (Section 20.2.1) shall be wired between the tap-changer control relay and the circuit breaker protecting the tap-changer control relay (specified in Section 6.2.3). A series connected auxiliary “a” contact from the secondary cabinet (Section 20.2.1) also shall be wired between the LTC backup control relay and the circuit breaker protecting the LTC backup control relay (specified in Section 6.2.3).


6.2.6 Load-Tap-Changer Motor Control. A mechanical switch shall be provided to select Automatic or Local Manual mode of operation. Controls shall be provided for manual operation of the LTC when in the manual mode. All controls shall be located in the control cabinet. The manufacturer shall operate all controls to ensure proper installation and performance. A double-pole, single-throw circuit breaker shall isolate and protect the tap-changer controls and motor. Fuses are not allowed. An LTC handcrank interlock switch shall be provided immediately ahead of the tap-changer motor to de-energize the motor.

6.2.7 Position Indicator. Both local and remote position indication shall be provided.

Local indication shall be in accordance with Section 6.2.7.1. Remote indication shall be in accordance with Section 6.2.7.2.

6.2.7.1 A mechanical position indicator shall be provided. An Incon Model 1292KS Selsyn synchro transmitter shall monitor the tap-changer position. The transmitter shall be connected to an Incon 1250BA-1-120-R-S monitor. The monitor shall be mounted in the control cabinet and shall be visible from the manual controls.

6.2.7.2 The manufacturer shall provide a Beckwith Electric Company Model

M-2025B current loop interface module to provide LTC tap position information to the M-2001C6SLAA digital tap-changer control relay.

6.2.8 Operation Counter. An operation counter shall register the accumulated number of tap changes performed.

6.2.9 Loss of Station Service to LTC Alarm. A voltage alarm relay shall be installed to sense a loss of station service voltage on all phases and on all auxiliary control circuits supplying the LTC motor. All alarm relays shall be located on the load side of the last practical interrupting device (e.g. breaker, handcrank interlock switch) in any circuit that could disable normal LTC operation. Alarm contacts from each relay shall be paralleled and provide a signal to the annunciator panel and be wired to an interconnect terminal block located in the control cabinet. Individual relays shall be labeled 27-1a, 27-1b, etc. The relays shall be Potter & Brumfield, KRPA series, socket-mount type with Potter & Brumfield screw terminal sockets.

6.2.10 Loss of Sensing Potential Alarm. A voltage alarm relay shall be installed

across the phase potential supplying the tap-changer control relay. A voltage alarm relay shall also be installed across the phase potential supplying the LTC backup control relay. The alarm relays shall be located on the load side of the last practical interrupting device (e.g. breaker, contact, internal or external supply switch) that could interrupt the potentials to the relays. Alarm contacts from each relay shall be paralleled and provide a signal to the annunciator panel and be wired to terminal points in the control cabinet. Individual relays shall be labeled 27-2a and 27-2b. The relays shall be Potter & Brumfield, KRPA series, socket mount type with Potter & Brumfield screw terminal sockets.


6.2.11 Freeze Position Relay. A latching relay, Struthers-Dunn Model B255BXBP-

125VDC, shall be provided to allow CPS to remotely freeze the tap-changer position in-place during circuit switching. A normally closed contact of the relay shall be installed between the circuit breaker protecting the tap-changer control relay (specified in Section 6.2.3) and the terminal points provided for the series connected contact (specified in Section 6.2.5). A second normally closed contact of the relay shall be installed between the circuit breaker protecting the LTC backup control relay (specified in Section 6.2.3) and the terminal points provided for the series connected contact (specified in Section 6.2.5) Terminal points shall be provided in the control cabinet for each coil of the latching relay. A normally open contact of the latching relay shall provide a signal to the annunciator panel and be wired to terminal points in the control cabinet. 7.0 GROUNDING PROVISIONS 7.1 Trailer Ground Bus. The mobile unit substation grounding shall be accomplished through the frame of the semi-trailer. The frame shall have 3” x 1/4” copper ground bus all the way around the trailer running the full length on each side and on each end of the trailer and as well as across the middle of the trailer. The bus shall be continuous. All equipment attached to the trailer shall be grounded to the bus on both sides of the trailer.

7.1.1 Transformer. The transformer shall be grounded to the trailer ground bus on both sides of the tank through grounding terminal points. Two (2) NEMA 6-hole steel based, copper-faced grounding pads shall be welded to the transformer tank on diagonally opposite sides near ground level. All holes in the pads shall have 1/2 - 13 UNC threads.

7.1.2 Arrester. Each arrester shall have a separate ground conductor attached to the ground bus. One (1) NEMA 2-hole steel based, copper-faced grounding pad shall be welded on each arrester mounting bracket near the base of the surge arrester position. All holes in the pads shall have 1/2 - 13 UNC threads.

7.1.3 Fault-initiating Switch. The fault-initiating switch shall have a separate ground conductor attached to the ground bus. 7.1.4 Low Voltage Cables. A ground bus with termination shall be provided for the connection of cable shielding leads at the low voltage output cable termination support structure.

7.1.5 Neutral. The transformer neutral bushing shall be grounded to a terminal on top of the transformer tank.

7.1.6 Conductors. All grounding conductors shall be appropriately sized bare copper, pre-formed, with compression terminals.


7.2 Clearances. All high-voltage and low voltage parts less than seven feet above ground level shall be shielded from accidental contact by use of permanently mounted metal shields. 7.3 Ground Connections. CPS will provide fittings and conductors for all ground connections to the trailer. 7.4 Core Ground Bushing. The manufacturer shall provide an external core ground test point from each insulated or isolated segment of core steel to an external low voltage bushing located on the top of the transformer. The bushings shall be Auburn Catalog F-200-1H. The bushings shall be capable of withstanding a test voltage of 1000 volts DC. For each core ground bushing, a permanent tag shall designate which core is attached to the bushing. Core ground bushings shall be housed in an accessible enclosure. NEMA 2-hole steel based, copper-faced-grounding pads shall be welded to the transformer tank cover, one each adjacent to each core ground bushing. All holes shall have 1/2 - 13 UNC threads. 8.0 OIL PRESERVATION SYSTEM An automatic nitrogen pressure oil preservation system shall be supplied with a nitrogen cylinder or nitrogen generator, a cabinet for the nitrogen cylinder or generator, transformer tank high and low pressure alarms, a nitrogen cylinder or generator low pressure alarm, a nitrogen pressure gauge, and all gas pressure regulating equipment. The cabinet shall be mounted as low as possible to the bottom of the semi-trailer for ease of access. Alarm contacts from each alarm relay shall be paralleled and provide a signal to the annunciator panel. Alarm contacts from each alarm relay shall be separately wired to terminal points in the control cabinet. The primary regulator shall be a two-stage type with BUNA-N diaphragm. Pressure gauges shall be provided for both the high side and the low side of the regulator. The connection fitting to the nitrogen cylinder shall fit a CGA #580 valve. Valves shall be provided to permit purging the gas space and testing the seal on the transformer tank by admitting dry nitrogen under pressure. A device shall be provided at a convenient level for sampling the gas. 9.0 COOLING EQUIPMENT The transformer shall be equipped with a forced oil, forced air cooled heat exchanger system. The heat exchanger system shall consist of an assembly of a tube bundle and fans mounted in a steel housing through which oil is pumped to dissipate heat. 9.1 Heat Exchangers and Pumps. Heat exchangers and pumps shall be removable and shall be located to not interfere with connections to the high and low-voltage bushings. Each section shall have shutoff valves enabling the removal of each section and 3/4-inch NPT drain and vent plugs. Heat exchangers and pumps shall be mounted


on the transformer by means of a header assembly and not be mounted directly to the transformer tank wall. Heat exchangers and pumps shall be assembly checked with the transformer tank at the factory to assure proper fit and alignment. The manufacturer shall perform a pressure test to 20 psi and a vacuum test on each section. Harley shall manufacture the pumps. 9.2 Motors. The fans and pump motors shall have Class F insulation and shall be designed to operate on a nominal 240-volt, 60 hertz circuit. Fan motors shall have sealed, permanently lubricated ball bearings. Oil circulation pump motors shall be designed to minimize maintenance. A double-pole, single-throw circuit breaker shall isolate and protect each fan and pump. Fuses are not allowed. 9.3 Fans. All fan blades shall have side and rear guards. Dayton or Krentz shall manufacture the fans. 9.4 Controls. Controls for manual operation of all cooling equipment shall be provided and shall include an “off” position on the control switch. The manufacturer shall test operate all controls to ensure proper installation and performance. A separate circuit breaker shall be provided to isolate and protect the controls. Fuses are not allowed. 9.5 Heat Exchanger Alarms. Voltage alarm relays shall be provided for loss of each phase voltage on the load side of the circuit breakers feeding each bank of heat exchangers. Alarm contacts from each alarm relay shall be paralleled and provide a signal to the annunciator panel and wired to terminal points in the control cabinet. Individual relays shall be labeled 27-3a, 27-3b, etc. The relays shall be Potter & Brumfield, KRPA series, socket-mount type with Potter & Brumfield screw terminal sockets. 9.6 Control Alarms. Voltage alarm relays shall be provided for loss of each phase voltage on the load side of the circuit breakers feeding the controls. The “Off” position on the controls shall be detected by the voltage alarm relays as a loss of voltage. Alarm contacts from each alarm relay shall be paralleled and provide a signal to the annunciator panel and wired to terminal points in the control cabinet. Individual relays shall be labeled 27-4a, 27-4b, etc. The relays shall be Potter & Brumfield, KRPA series, socket mount type with Potter & Brumfield screw terminal sockets. 9.7 Oil Flow Indicators. A vane-operated oil flow indicator shall be used with each forced oil pump on the transformer. These vane-operated oil flow indicators shall provide a visual indication that the pumps are properly operating to give an adequate flow of oil for cooling. Contacts on the oil flow indicators shall provide a red indicating light in the event of pump failure. Contacts also shall be wired to trip and block closing the secondary breaker in the event of pump failure. Alarm contacts shall be paralleled and provide a signal to the annunciator panel and be wired to an interconnect terminal block located in the control cabinet. Tripping and alarming shall be time delayed, adjustable from 0-15 sec.


9.8 Reverse Phase Voltage Relay. A reverse phase voltage relay shall sense reverse phase sequence and under voltage of the fans and pump circuits to the heat exchanger system. For a reverse sequence condition, contacts from this relay shall trip and block closing of the secondary breaker. For an under voltage condition, contacts from this relay shall be wired to trip and block closing of the secondary breaker. Alarm contacts shall provide a signal to the annunciator panel and shall be wired to an interconnect terminal block located in the control cabinet. Tripping and alarming shall be time delayed, adjustable from 0-15 seconds. 9.9 Exciting Current Requirement. The transformer is not required to have a self-cooled rating, but shall be capable of carrying exciting current indefinitely upon failure of the fans or pumps without raising the temperature to a value that might be injurious to the transformer. 9.10 Connections. Rubber hose connections between the heat exchangers and main tank, main tank and pumps, or pumps and heat exchangers are not acceptable. No rubber hose connections are acceptable in the cooling oil-flow path. Connections and expansion joints shall be stainless steel and have flange-type connections. 9.11 Operation. Cooling system shall be designed such that the transformer shall continue to operate successfully under conditions of loss of cooling capability and load until such continued operation jeopardizes the safety of the transformer. 10.0 BUSHINGS All bushings shall be capacitance-graded type bushings meeting the requirements of CPS Specification 781-06 and the following additional requirements. 10.1 Type. All bushings shall be oil-filled. The high-voltage bushings shall also be draw-lead type. 10.2 Terminals. The high voltage and low voltage phase bushings shall be provided with NEMA 4-inch, 4-hole copper pad terminals rated for maximum current. External current transfer points shall be tinned or silver-plated. The neutral bushing shall be provided with a terminal that will accommodate stranded copper conductor in the size range from 4/0 to 500 kCM. 10.3 Capacitance taps. Bushings shall have capacitance taps for power factor testing.


10.4 Insulation Level. The minimum insulation level of the bushings shall be as follows:

CPS Material No.

Bushing H (138 kV)

Bushing X (36 kV)

Bushing X (13.8 kV)

Bushing XO (Neutral)

9003500 650 kV 150 kV 150 kV 9003502 650 kV 250 kV 150 kV

10.5 Creep Distance. The minimum creep distance of the bushings shall be as follows:

CPS Material No.

Bushing H (138 kV)

Bushing X (36 kV)

Bushing X (13.8 kV)

Bushing XO (Neutral)

9003500 79 Inches 17 Inches 11 Inches 9003502 79 Inches 35 Inches 11 Inches

10.6 Manufacture. Bushings shall have been manufactured by Lapp 10.7 Orientation. Manufacturer shall orient bushings such that no oil reservoir is required. 11.0 SURGE ARRESTERS The mobile unit substation shall be equipped with three high-voltage surge arresters and three low-voltage surge arresters. 11.1 Type. Surge arresters shall be station class metal-oxide-varistor (MOV) gapless type. All arrester housings shall be polymer or porcelain and shall be sky gray in color. 11.2 High-Voltage Surge Arrester Rating.

Arrester Duty Cycle Voltage

Arrester MCOV

108 kV 84 kV 11.3 Low-Voltage Surge Arrester Rating.

CPS Material No.

Arrester Duty Cycle Voltage

Arrester MCOV

9003500 10 kV 8.4 kV 9003502 27 kV 22 kV

11.4 Mounting. The manufacturer shall minimize the distance between the bushing and its associated surge arrester on each phase. The surge arresters shall be properly mounted and braced to withstand shocks and to avoid vibration during transit. 12.0 CURRENT TRANSFORMERS ON THE TRANSFORMER


The following current transformers shall be provided on the transformer. 12.1 Current Transformers For Relaying. There shall be two (2) complete sets of current transformers provided as shown on Drawing 7. Current transformers shall be multi-ratio, bushing-type with fully distributed windings as indicated below. The current transformers shall be furnished as follows:

Bushing

CT Rating

Relay Accuracy Classification

Quantity Each Bushing

Total Quantity

138 kV (upper) 600:5 C800 1 3 138 kV (lower) 2000:5 C800 1 3

Neutral 600:5 C800 1 1 The upper set shall be used for transformer differential and backup overcurrent relaying. The lower set shall be reserved for use by CPS for 138 KV bus differential relaying. 12.2 Other Current Transformers. Additional bushing-type current transformers shall be provided for “hot spot” winding temperature and line drop compensation. 12.3 Polarity Marks. All CTs shall have easily identifiable polarity marks on both primary and secondary terminals. 12.4 Termination. Secondary leads for all CTs shall be wired to terminal blocks equipped with shorting bars located in the control cabinet. There shall be one terminal block for each CT. A metal nameplate showing current transformer tap connections and ratios shall be mounted in the same general vicinity as the terminal blocks. 13.0 OTHER TRANSFORMER INDICATION, ALARM AND RELAY DEVICES The following additional control, alarm, and protection devices shall be mounted and wired in the control cabinet. 13.1 DC Voltage. All alarm and relay contacts shall be rated for use at 125 volts DC. 13.2 Liquid Level Indicators. The transformer shall have liquid level indicators with alarm contacts for each isolated oil-filled compartment. Alarm contacts shall provide a signal to the annunciator panel and shall be wired to an interconnect terminal block in the control cabinet. 13.3 Liquid Temperature Indicator. The transformer shall have a liquid temperature indicator with alarm contacts. The gauge on the indicator shall be marked at the temperature setting of the alarm, or the setting may be indicated on a suitable nameplate adjacent to it. Alarm contacts shall provide a signal to the annunciator panel and shall be wired to an interconnect terminal block in the control cabinet.


13.4 Winding Temperature Indicator.

13.4.1 Excessive Temperature. The transformer shall have a re-settable winding temperature indicator with contacts to trip and block closing the secondary breaker when the maximum safe operating temperature of the winding will be exceeded. Contacts shall provide a signal to the annunciator panel and be wired to an interconnect terminal block located in the control cabinet. A red indicating light shall be provided.

13.4.2 Warning Temperature. The indicator shall also indicate the approach of the

maximum safe operating temperature of the winding. Alarm contacts shall provide a signal to the annunciator panel and shall be wired to an interconnect terminal block located in the control cabinet. An amber indicating light shall be provided.

13.4.3 Indicating Gauge. The indicator shall be equipped with a gauge marked at

the temperature setting of the alarm and at the temperature setting of the trip. As an option, the settings may be indicated on a suitable nameplate adjacent to the gauge.

13.5 Direct Reading Temperature Indicators. Manufacturer shall provide an option for direct reading fiber optic probes to measure the top oil temperature, the bottom oil temperature, and the primary and secondary B phase winding hot spot temperature. Nortech shall manufacture the products. 13.6 Rapid Pressure Relay. A Qualitrol Model 910-014-02 rapid pressure relay together with a Qualitrol Model 208 mechanical pressure relief device shall be mounted on the main transformer tank cover. The rapid pressure relay shall be wired to a Qualitrol Model 909-200-01, 125 volt DC seal-in relay located in the control cabinet. The seal-in relay shall trip the transformer lockout (Device 86T). Alarm contacts from the seal-in relay shall provide a signal to the annunciator panel and be wired to an interconnect terminal block located in the control cabinet. 13.7 Annunciator Panel. The mobile unit substation shall be supplied with an industrial grade annunciator panel that will reliably perform after extensive road and transformer vibration. The information regarding the type of annunciator shall be supplied at the time of bid for evaluation purposes. All alarm signals listed below shall be wired to separate points on the annunciator panel located in the control cabinet. One dry contact from the annunciator panel shall be wired to a terminal block located in the control cabinet for supervisory alarming when any of the individual alarms operate.

a. Main Tank and LTC Pressure Relief (63PR), Section 5.4 b. LTC Vacuum Bottle Failure (86X), Section 6.2.1 c. LTC Backup Control (59/68), Section 6.2.3


d. LTC Loss of Station Service (27-1), Section 6.2.9 e. Loss of Sensing Potential (27-2), Section 6.2.10 f. Freeze Position Activation (FPR), Section 6.2.11 g. Oil Preservation (63), Section 8.0 h. Heat Exchanger (27-3), Section 9.5 i. Heat Exchanger Control (27-4), Section 9.6 j. Oil Flow (80Q), Section 9.7 k. Reverse Phase Voltage (47), Section 9.9 l. Liquid Level Main Tank (71Q-1), Section 13.2 m. Liquid Level LTC (71Q-2), Section 13.2 n. Liquid Temperature (26Q-1), Section 13.3 o. Excessive Winding Temperature (49T-1), Section 13.4.1 p. Winding Temperature Warning (49T-2), Section 13.4.2 q. Rapid Pressure (63X), Section 13.6 r. Loss of AC to Control Cabinet Heaters (27-5), Section 14.8 s. Loss of AC to Secondary Breaker Motor (27-6), Section 20.4 t. Loss of DC to Secondary Breaker Motor (27-7), Section 20.4 u. Loss of AC to Secondary Cabinet Heaters (27-8), Section 20.4 v. Secondary Breaker Low Energy Alarm (ILEA), Section 20.4 w. Loss of Transformer Primary Overcurrent Relay (IL50/51P), Section 21.2.2 x. Loss of Transformer Differential Relay (IL87T), Section 21.2.3 y. Loss of DC to Transformer Differential Circuit (27-9), Section 21.2.4 z. Loss of Secondary Breaker Overcurrent Relay (IL50/51S), Section 21.3.1


aa. Loss of Voltage Transformer Potentials (ILPT), Section 21.3.1 bb. Loss of DC to Secondary Breaker Circuit (27-10), Section 21.3.3 cc. Status of Fault-Initiating Switch, Section (I57), 24.3.5 dd. Loss of DC to Motorized Operator (27-11), Section 24.4.4 ee. Spares

13.8 Loss-of-DC To Rapid Pressure Relay. A voltage alarm relay shall be provided to monitor the DC source of section 14.6. The alarm relay shall be located in the control cabinet on the load side of the last practical interrupting device (e.g. breaker, contact, internal or external supply switch) that could interrupt the potential. The alarm contacts shall be wired to terminal points in the control cabinet. The relay shall be Potter and Brumfield Model KRP11DG, socket-mount type with Potter & Brumfield screw terminal sockets. The relay shall be labeled 27-6. 13.9 Gauge Covers. All gauges or indicating dials shall have removable face plates. 14.0 CONTROL CABINET The transformer shall have only one (1) control cabinet. Tap changer control equipment as an option may be located in a separate tap-changer equipment cabinet. The cabinet(s) shall be weatherproof and shall be NEMA approved and/or UL listed. No screws or bolts shall penetrate the walls of the cabinet. 14.1 Dimensions. The control cabinet shall be 48 inches wide by 34 inches high or larger. 14.2 Location. The cabinet(s) shall be located at a convenient working height easily accessible for a worker standing on the semi-trailer. 14.3 Vents. The cabinet(s) shall have vents with replaceable filters. 14.4 Doors. The door(s) of the control cabinet shall swing in the horizontal plane and shall have a wind latch device for keeping the door(s) open. The door(s) shall have full height hinges and a three-point latching mechanism. The door(s) shall have a hinged panel on the inner side that can be lowered to a horizontal position to hold a multimeter while making tests in the cabinet and shall have a compartment for holding the Instruction Manual and one set of drawings. Door(s) to all cabinets shall have a provision for CPS to install a padlock for securing the cabinet.


14.5 Conduit Provision. The bottom of the control cabinet shall include a bolt-on removable steel plate not less than 12 inches x 24 inches in size. The plate shall be constructed such that CPS can remove and cut 2-inch to 4-inch diameter conduit holes for CPS wiring. 14.6 Grounding Provision. The cabinet(s) shall have a safety grounding connector. 14.7 Lighting and Duplex Outlet. The cabinet(s) shall be equipped with a 130 VAC, 60 Hz, 100-watt incandescent light with a switch and a 120-volt duplex outlet. Both shall be protected by a 20-amp circuit breaker. The cabinet also shall be equipped with an external, weatherproof, 120-volt duplex outlet protected by a 20-amp circuit breaker. 14.8 Heater. The cabinet(s) shall be provided with a thermostatically-controlled heater for humidity control. The thermostat shall be set to cut-off when temperature rises above 90°F. A voltage alarm relay shall be provided for loss of voltage on the heaters. Alarm contacts from the alarm relay shall provide a signal to the annunciator panel and be wired to terminal points in the control cabinet. The relay shall be labeled 27-5. The relay shall be Potter & Brumfield, KRPA series, socket-mount type with Potter & Brumfield screw terminal. 14.9 Terminations. Controls, contacts from alarms and devices, analog signals and CT secondary leads for CPS use (as specified throughout this specification) shall be wired to terminal block points in the control cabinet. The manufacturer shall terminate wires and locate terminal blocks as indicated in Drawing 9. References to applicable sections of this specification are shown on Drawing 9 for clarification. The manufacturer shall test operate all relays and devices to ensure proper alarm and contact operation. All terminal blocks shall be clearly marked, easily accessible to workers and also accessible to the control cable entering the bottom of the control cabinet without the control cable overlapping other components in the cabinet. There shall be no manufacturer connections on the side of the terminal block allocated for CPS connections. These interconnect blocks shall include the following:

a. Pressure Relief Main Tank and Tap Changer (63PR-1 and 63PR-2), Section 5.4. b. LTC Vacuum Bottle Failure (86X), Section 6.2.1 c. LTC Backup Control (59/68), Section 6.2.3 d. Loss of AC to Tap Changer (27-1), Section 6.2.9 e. Loss of Sensing Potentials (27-2), Section 6.2.10 f. Freeze Position (FPR/O, FPR/R and FPR), Section 6.2.11


g Transformer Nitrogen Low Pressure (63LT), Section 8.0 h. Transformer Nitrogen High Pressure (63HT), Section 8.0 i. Nitrogen Cylinder Low Pressure (63LC), Section 8.0 j. Loss of AC to Heat Exchanger (27-3), Section 9.5 k. Loss of AC to Heat Exchanger Controls (27-4), Section 9.6 l. Oil Flow (80Q), Section 9.7 m. Reverse Phase Voltage (47), Section 9.8 n. All transformer multi-ratio taps of current transformers Section 12.4 o. Low Oil Level Main Tank (71Q-1), Section 13.2 p. Low Oil Level Tap Changer (71Q-2), Section 13.2 q. High Oil Temperature (26Q-1), Section 13.3 r. Hot Spot (49T-1), Section 13.4.1 s. Hot Spot Warning (49T-2), Section 13.4.2 t. Rapid Pressure (63X), Section 13.6. u. Annunciator alarm dry contact (30AL), Section 13.7 v. Loss of AC to Control Cabinet Heaters (27-5), Section 14.8 w. One secondary breaker “b” contact for breaker status, Section 20.2.6 x. One remaining secondary breaker “a” and one remaining secondary breaker “b”

contact, Section 20.2.7 y. All multi-ratio taps of current transformers for use by CPS for secondary bus

differential relaying, Section 20.3.3 z. All multi-ratio taps of current transformers for use by CPS for metering, Section

20.3.4 aa. Loss of AC to Secondary Breaker Motor (27-6), Section 20.4


bb. Loss of DC to Secondary Breaker Motor (27-7), Section 20.4

cc. Loss of AC to Secondary Cabinet Heaters (27-8), Section 20.4 dd. Secondary Breaker Low Energy Alarm (ILEA), Section 20.4 ee. Provision for 125-volt DC for transformer differential relay circuit, Section 21.2 ff. One set of normally open and two sets of normally closed contacts from the

transformer lockout (86T), Section 21.2.1.1 gg. Loss of Transformer Primary Overcurrent Relay (IL50/51P), Section 21.2.2 hh. Loss of Transformer Differential Relay (IL87T), Section 21.2.3 ii. Loss of DC to Transformer Differential Relay Circuit (27-9), Section 21.2.4

jj. Provision for 125 volt DC for secondary breaker relay circuit, Section 21.3

kk. Loss of Secondary Breaker Overcurrent Relay (IL50/51S), Section 21.3.1 ll. Loss of Voltage Transformer Potentials (ILPT), Section 21.3.1

mm.Supervisory secondary breaker trip and close interposing relay coil (201T52

and 201C52), Section 21.3.2 nn. Loss of DC to Secondary Breaker Relay Circuit (27-10), Section 21.3.3 oo. Output from the Watt (W), Var (R) and Volt (V) transducers, Section 21.3.7. pp. Voltage Transformer Potentials, Section 22.2 qq. Two fault-initiating switch “a” contacts for CPS use (57a), Section 24.3.4 rr. Two fault-initiating switch “b” contacts for CPS use (57b), Section 24.3.4 ss. One fault-initiating switch “a” contact for status (I57), Section 24.3.5 tt. Provision for 125 volt DC for motorized operator, Section 24.4 uu. Supervisory motorized operator open and close interposing relay coil (201TMO

and 201CMO), Section 24.4.2 vv. One motorized operator “a” auxiliary switch contact reserved for CPS use, Section 24.4.3


ww.One motorized operator “b” auxiliary switch contact reserved for CPS

use,Section 24.4.3 xx. Loss of DC to Motorized operator (27-11), Section 24.4.4 yy. One motorized operator “b” contact for status (IMO), Section 24.4.6

14.10 Other Accessories. The control cabinet shall include the following:

a. All accessories named in this specification, which are to be located in the control cabinet

b. Load-tap-changer control equipment c. One (1) three-pole power distribution block capable of terminating one (1) #12 to

2/0 primary connection per pole and four (4) #12 to #4 secondary connections per pole (Gould Model 63133 or equal)

d. Properly sized molded-case circuit breakers for all 120/240 VAC and 125 VDC

loads. Knife switches and fuses are not allowed. 14.11 Connection for Load-Tap-Changer Control Equipment. The control cabinet or the tap changer equipment cabinet (if supplied) shall include provision for CPS connection to load-tap-changer control equipment. 14.12 Marking. All terminals and equipment shall be permanently marked and clearly identified. 14.13 Safety Grounds. Safety ground wiring for individual electrical components shall be separate from the 120 VAC power neutral and shall be wired to a separate terminal block. Control, alarm, and power circuit wiring for electrical components shall be isolated from the safety ground wiring. Safety grounds shall not be consecutively (series) wired from component to component. 14.14 General Equipment Requirement. All terminal blocks, relays, switches, control equipment, etc. shall be NEMA approved and/or UL listed. 15.0 AUXILIARY WIRING Auxiliary wiring shall be furnished in accordance with the following requirements: 15.1 Type. All wiring shall be 600 volt, flame-resistant, moisture-resistant, heat-resistant, oil-resistant, 90°C rated insulation over stranded, copper conductors.


15.2 Size. All auxiliary wiring shall be minimum No. 14 AWG or equivalent. All CT wiring shall be minimum No. 10 AWG or equivalent. 15.3 Terminals. Each stranded conductor shall have compression type terminals. 15.4 Marking. Each end of a conductor shall be permanently marked and clearly identified. 15.5 Containment. All wiring shall be bundled or contained. All auxiliary wiring external to the transformer shall be in threaded rigid conduit. Conduit shall contain external wiring and shall be terminated to J-boxes or cabinets with a watertight conduit hub meeting Federal Specification A-A-50553. Flex or thin wall conduit is not acceptable except for short runs between the main conduit and devices. Conduit shall not be installed across the transformer tank cover except as necessary to make connections to devices mounted on the tank cover. There shall be no conduit entrances in the top of terminal boxes or control cabinets. 15.6 Splices. Splices in any auxiliary wiring will not be allowed. 16.0 TRANSFORMER NAMEPLATE Nameplate information shall be stamped or laser engraved into stainless steel or anodized aluminum nameplates. The information on the nameplate shall be applied such that it is weatherproof, ultraviolet resistant, scratch resistant and permanent for the life of the transformer under normal handling and operating conditions. Silk-screened and laser etched paint are not acceptable. The following information shall be listed on the transformer nameplate in addition to ANSI nameplate requirements:

a. LTC type, manufacturer, model number, serial number, voltage rating, continuous current rating and tables of voltages and currents at maximum KVA and all LTC taps.

b. Statement the transformer tank and LTC compartments are individually designed

for vacuum filling at full vacuum c. CFM rating per fan d. Current transformer diagrams marked with polarity and multi-ratio informatione. e. The words "< 1ppm PCB at time of mfg"

17.0 TRANSFORMER TESTING The tests enumerated below shall be performed on the transformer after the transformer has been permanently installed on the semi-trailer.


17.1 Transformer Tests. All tests shall be performed with the bushings and cooling equipment that are to be shipped with the transformer. Test bushings and test cooling equipment are not permitted. Oil used during testing shall meet the requirements of Section 3.0. The manufacturer shall notify CPS when test results do not meet required standards or specifications prior to shipment. All “Routine” tests listed in IEEE C57.12.00 and the following additional tests, as specified by CPS, shall be performed on the transformer in accordance with IEEE C57.12.00 and IEEE C57.12.90. 17.1.1 Winding Resistance. Resistance measurements shall be made phase to phase on the primary windings. Resistance measurements shall be made phase-to-neutral on the secondary windings in all LTC steps. Winding temperature should be recorded at the time of the test. The test set used to perform these measurements shall have a four (4) digit display with an accuracy of ± 0.5%. Resistance measurements between adjacent phases shall be within 2%.

17.1.2 Transformer Turns Ratio(TTR). The turns ratio shall be measured in all LTC steps. The turns ratio between windings shall not deviate more than 0.5% from adjacent phases and the calculated ratio. The test set used to perform these measurements shall have a five (5) digit display with an accuracy of ± 0.1%. 17.1.3 No-Load Losses. Excitation current and losses shall be measured at 100% rated voltage. 17.1.4 Impedance and Load Losses. The impedance and load-losses shall be measured at rated MVA in the 16L, 15L, 8L, 2L, 1L, N, 1R, 2R, 8R, 15R and 16R tap positions.

17.1.5 Temperature Rise. Temperature rise tests made at the maximum forced-cooled ratings are required on the transformers. The temperature rise test shall be a twenty-four hour test. Temperature test data on duplicate transformers is not acceptable to fulfill this requirement. Measure and report both the top and bottom oil rises for the maximum forced-cooled rating. The oil temperature tests shall be performed on the same LTC tap. Oil samples shall be taken for gas-in-oil (GIO) analysis immediately before and after the temperature tests. In addition, an oil sample shall be taken for gas-in-oil analysis a minimum of eight (8) hours after the completion of the temperature tests. The gas-in-oil analysis from the two samples taken after the completion of the temperature tests shall be compared to the gas-in-oil analysis from the pretest sample. The maximum allowable increases in the gas levels are based on the difference of the measured gas densities before and after the tests and shall be as follows:

Hydrogen 10 ppm Ethylene 2 ppm Methane 2 ppm


Ethane 2 ppm Acetylene 0 ppm Carbon Monoxide 20 ppm Carbon Dioxide 100 ppm

The gas-in-oil analysis shall be performed by one of the following independent test labs or an independent lab approved by CPS:

Weidmann TJH2B Doble ATI Morgan Schaffer

If the gases have increased by more than the limits outlined above, CPS shall be contacted and a course of action determined. In general, it is expected that the manufacturer shall locate and correct any problem that results in gas values above these limits.

17.1.6 Excitation, 24-hr Test. A 24-hour excitation test at 110% voltage is required. Excitation test data on duplicate transformers is not acceptable to fulfill this requirement. Oil samples shall be taken for gas-in-oil analysis immediately before and after the excitation test. In addition, an oil sample shall be taken for gas-in-oil analysis a minimum of eight (8) hours after the completion of the excitation test. The gas-in-oil analysis from the two samples taken after the completion of the excitation tests shall be compared to the gas-in-oil analysis from the pretest sample. The maximum allowable increases in the gas levels are based on the difference of the measured gas densities before and after the tests and shall be as follows:

Hydrogen 4 ppm Ethylene 1 ppm Methane 2 ppm Ethane 2 ppm Acetylene 0 ppm

The gas-in-oil analysis shall be performed by one of the following independent test labs or an independent lab approved by CPS:

Weidmann TJH2B Doble ATI Morgan Schaffer


If the gases have increased by more than the limits outlined above, CPS shall be contacted and a course of action determined. In general, it is expected that the manufacturer shall locate and correct any problem that results in gas values above these limits. 17.1.7 Audible Sound. Transformer audible sound level measurements shall be made in accordance with NEMA TR-1. Test data on duplicate transformers is not acceptable to fulfill this requirement. 17.1.8 Power Factor. Insulation power factor measurements for each winding shall be made in accordance with IEEE C57.12.90 Table 1, Method 2. Dissipation factor tests reads will not be accepted. The test shall follow all induced potential and applied potential tests. CPS will not accept the transformer with insulation power factor tests (CH, CL, CHL) greater than .500%, corrected to 20°C. Test connections shall be in accordance with Table l below. Insulation power factor measurements shall be performed with a 10kV Doble test set.

17.1.9 Insulation Resistance. Insulation resistance measurements for each winding shall be made in accordance with IEEE C57.12.90. This test shall be performed at 2.5 kV DC. Initial measurements shall be taken after fifteen (15) seconds, then five (5) more readings shall be taken at one (1) minute intervals. The one-minute reads shall be greater than those specified in Table Il. All reads shall be corrected to 20°C in accordance with Table IIl. For each winding, the measurements with the winding guarded shall be greater than the measurements with the winding grounded. The measurements shall be increasing after each time interval. The test set used to perform these measurements shall have a range greater than 50,000 megohms at 2.5 kV. Test connections shall be in accordance with Table l.

Table I - Test Connections

1) High Energized With Case and Low Grounded 2) High Energized With Case Grounded and Low Guarded 3) Low Energized With Case and High Grounded 4) Low Energized With Case Grounded and High Guarded

Table Il -One Minute Reads to Ground

Minimum Insulation Resistance in Oil at 20° C

L-L kV Class Megaohms

138 13800 34.5 3450 13.8 1380


Table IIl -Insulation Resistance Temperature Correction

Transformer Correction Transformer Correction Temperature °C Factor Temperature °C Factor

95 89.0 35 2.50 90 66.0 30 1.80 85 49.0 25 1.30 80 36.2 20 1.00 75 26.8 15 0.73 70 20.0 10 0.54 65 14.8 5 0.40 60 11.0 0 0.30 55 8.1 -5 0.22 50 6.0 -10 0.16 45 4.5 -15 0.12 40 3.3

17.1.10 Ground Resistance. Prior to shipment, a core ground DC resistance measurement shall be made. The transformer shall have all bushings removed and shall be filled with dry air under a slight positive pressure not to exceed 5 psig. The test set used to perform this measurement shall have a range of 10,000 megaohms at 500 volts and 20,000 megaohms at 1.0 kV.

17.1.11 Dew Point. Prior to shipment, a dew point test shall be made. The transformer shall have all bushings removed and shall be filled with dry air under a slight positive pressure not to exceed 5 psig. The transformer shall then sit for 24 hours prior to performing the dew point test. The measured 24-hour dew point read shall be less than the maximum dew point value calculated in the formula below to insure the transformer is dry.

Max. dew pt. in °C. = [.83 x (insulation temp. in °C)] + [.3 x (tank PSIG)] - 48 17.1.12 Excitation. Excitation measurements shall be made on the primary

windings with the LTC positioned in all steps. The excitation measurements shall be performed with a 10kV Doble test set.

17.1.13 Induced Voltage. An induced voltage test shall be made in accordance with IEEE C57.12.90. Partial discharge measurements shall be made every one-minute during the one hour period. Partial discharge measurements in pico-coulombs per IEC may be allowed with CPS approval.

17.1.14 Frequency Response. A frequency response test shall be made using a Framit test set manufactured by Star Logic equipped with software version 3.0.2. If this test set is not available, CPS reserves the right to perform the test at the factory using


CPS equipment. Should CPS elect to perform this test, the manufacture shall reimburse CPS one thousand dollars ($1000.00). 17.2 Bushing Tests. The manufacturer shall perform power factor and capacitance tests on all bushings while the bushings are installed on the transformer. The manufacturer shall provide a report with the results of these tests as well as a certified test report for all bushings from the bushing manufacturer. The certified test report shall include initial power factor measurements. 17.3 Quality Control Testing. Prior to shipment, load-tap-changing equipment, cooling equipment, current transformers, and all other transformer accessories, relays and indicating devices shall be subjected to appropriate quality control testing to verify correct operation, assembly and connection. The manufacturer shall provide a copy of any quality control certifications, such as ISO 9001, as part of the proposal. 17.4 Testing Sequence and Pre-Approved Test Results.

17.4.1 Testing Sequence. The tests shall be performed in the following sequence: a. Resistance Measurements b. Ratio Tests c. Polarity and Phase Relation Tests d. Excitation Losses and Percent Excitation Current Measurements e. Percent Impedance and Load Loss Measurements f. Lightning Impulse Test g. Applied Potential Test (100% test level) h. Induced Voltage Test and Partial Discharge Measurement i. Frequency Response j. Insulation Power factor Measurements k. Doble Excitation Measurements l. Insulation Resistance Measurements

m. Audible Sound Level n. Temperature Rise (24 Hour) and GIO Analysis o. Excitation (110%) & DGAs p. Core Ground DC Resistance Measurement q. Bushing Tests (Power Factor and Capacitance) r. Dew Point Measurement

17.4.2 Test Results. Test results for all tests indicated in Section 17.4.1 shall be

approved by CPS prior to shipment of the transformer. These test results shall be faxed to the CPS Supervisor of Substation Engineering and Protection (Fax Number 210-353-4449). 17.5 Witness of Testing. CPS reserves the right to witness all tests on all transformers purchased. The manufacturer shall fax the testing schedule to the CPS Supervisor of Substation Engineering and Protection (Fax 210-353-4449) at least three (3) weeks


prior to the beginning of factory tests. All tests performed for witnessing by CPS shall be scheduled on consecutive weekdays between 6:00 AM and 7:00 PM. Copies of test results for factory tests witnessed by CPS representatives shall be made available to the representatives at the time of the testing. Should CPS elect to witness transformer testing, the manufacturer shall provide transportation and accommodations and cover all other reasonable expenses for two CPS witnesses. 17.6 Test Reports. In addition to the pre-approved test results indicated in Section 17.4 and the factory witnessed test results indicated in Section 17.5, certified test reports for the transformer shall be submitted to CPS in accordance with Section 28.4. Transformer test reports shall include test measurements and oscillograph photos or computer graphic printouts for all transformer tests made by the manufacturer and shall include a cover sheet containing a summary of all major test results. The manufacturer shall also present evidence of quality control testing and proof that the transformer has passed these tests. Any deviation between the certified test results and the test results reported to CPS per Sections 17.4 and 17.5 may require re-testing of the transformer at the manufacturer's expense. 18.0 TRANSFORMER LOSS EVALUATION 18.1 Evaluation. Transformer losses will not be considered in evaluating transformer bids. 19.0 AC STATION SERVICE AUXILIARY TRANSFORMERS 19.1 Transformers. Two single-phase auxiliary power station service transformers (CPT) will be mounted on the trailer external to the main transformer and externally connected to the low-voltage winding at the location shown on Drawing 1. Station service transformers shall be in accordance with chart below. Secondary of the station service transformers shall be connected open delta for single-phase, three-wire 120/240 volt and three-phase, 240V service to supply all transformer auxiliary requirements as lights, heaters, pump motors, fan motors, accessories, power supplies and load-tap-changer. The primary side shall be connected phase to ground. The single-phase 120/240 volt lighting transformer shall have additional capacity to deliver 100 amps at 240 volts to power additional CPS requirements. The transformers must be sized and designed so that there are no problems with saturation, capacity, high or low voltage conditions under the full range of voltage capability of the power transformer.

CPS Material No. Voltage9003500 7,960 – 120/240 9003502 19,920 – 120/240


19.2 Transfer Switch. Transfer switch provisions shall be provided for energizing all the transformer auxiliary equipment from an external source. One (1) weatherproof connector for connection of the external 120/240 volt AC three-phase power to the mobile substation shall be provided and shall be located near the control cabinet. 19.3 Panelboard. An outdoor panelboard containing molded-case circuit breakers with the proper breaker sizing and interrupting rating for all branch circuit auxiliary transformer loadings as fan motors, pumps, lights, heaters, load-tap-changer, accessories and power supplies. A molded-case circuit breaker also shall be provided to supply the additional CPS requirements of 100 amperes. 20.0 CIRCUIT BREAKER One outdoor, three-phase, circuit breaker shall be supplied connected on the low-voltage side of the transformer. Circuit breaker shall be in accordance with the parameters in the table below including the referenced CPS Specification unless otherwise stated within this specification. Circuit breaker shall be manufactured by Siemens and equipped with porcelain bushings.

CPS Material No.

Voltage Rating

Continuous Current Rating

CPS Specification No.

9003500 15 kV 2000 Ampere 680-07 9003502 38 kV 1200 Ampere 680-05

20.1 Circuit breaker shall be vacuum-type design. 20.2 Circuit Breaker Auxiliary Switch Utilization. Auxiliary switches specified in CPS Specification 680-05 and 680-07, as applicable, shall be utilized in the following manner.

20.2.1 Auxiliary Switches for LTC Control. Interconnect terminal points for two (2) “a” auxiliary switches labeled 101/102 and 105/106 on the terminal blocks in the breaker cabinet shown on Drawing 6 of Specification 680-05 or 680-07 shall be used to interrupt the automatic control circuit of the transformer load-tap-changer when the breaker is open in accordance with section 6.2.5 of this specification.

20.2.2 Auxiliary Switch for Breaker Open Indication. Interconnect terminal points for one (1) “b” auxiliary switch labeled 103/104 on the terminal blocks in the breaker cabinet shown on Drawing 6 of Specification 680-05 or 680-07 shall be used in conjunction with the SEL-351S green light of section 21.3.7 of this specification to provide a green light open indication.

20.2.3 Auxiliary Switch for Loss of DC. Interconnect terminal points for one (1) “a” auxiliary switch labeled 109/110 on the terminal blocks in the breaker cabinet shown on Drawing 6 of Specification 680-05 or 680-07 shall be used in conjunction with the relay


contact of section 21.3.3 of this specification such that an indication of a loss of DC to the breaker is not received when the breaker is open.

20.2.4 Auxiliary Switches for Motorized Operator. Interconnect terminal points for two (2) “b” auxiliary switches labeled 107/108 and 111/112 on the terminal blocks in the breaker cabinet shown on Drawing 6 of Specification 680-05 or 680-07 shall provide supervision of the motorized operator in accordance with section 24.4.1 of this specification.

20.2.5 Auxiliary Switch for Relaying. Interconnect terminal points for one (1) “a” auxiliary switch labeled 113/114 on the terminal blocks in the breaker cabinet shown on Drawing 6 of Specification 680-05 or 680-07 shall be used to provide breaker status to the SEL-351S relay of section 21.3.1 and to the SEL-587 relay of section 21.2.3.

20.2.6 Auxiliary Switch for Breaker Status. Interconnect terminal points for one (1) “b” auxiliary switch labeled 115/116 on the terminal blocks in the breaker cabinet shown on Drawing 6 of Specification 680-05 or 680-07 shall be wired to the control cabinet to provide supervisory I-wire breaker status.

20.2.7 Spare Auxiliary Switches. All remaining unused “a” auxiliary switch and “b”

auxiliary switch interconnect terminal points on the terminal blocks in the breaker cabinet shown on Drawing 6 of Specification 680-05 or 680-07 shall be wired to the control cabinet for CPS use. 20.3 Circuit Breaker Current Transformers. The mobile unit circuit breaker unit shall be equipped with the following current transformers in place of the current transformers called for in CPS Specification 680-05 and 680-07. Current transformer secondary leads of all winding taps shall be wired to terminal blocks equipped with shorting bars located in the breaker cabinet. A metal nameplate showing current transformer tap connections and ratios shall be mounted in the same general vicinity as the terminal blocks.

20.3.1 Current Transformers for Overcurrent Relays and Transducers. Three (3) current transformers on the transformer side of the breaker WYE connected for overcurrent relaying and transducers (ANSI C57.13 Classification C800 R.F.=1.33) shall be provided in accordance with the table below.

CPS Material No. Current Transformer Ratio9003500 2000/5 Multi-Ratio 9003502 1200/5 Multi-Ratio

20.3.2 Current Transformers for Transformer Differential Relays. Three (3) current

transformers located on the load side of the breaker WYE connected for transformer differential relaying (ANSI C57.13 Classification C800 R.F.=1.33) shall be provided in accordance with the table below.


CPS Material No. Current Transformer Ratio

9003500 2000/5 Multi-Ratio 9003502 1200/5 Multi-Ratio

20.3.3 Current Transformers for CPS Differential Relays. Three (3) current

transformers mounted on the transformer side of the breaker WYE connected and wired from the breaker cabinet to shorting blocks in the control cabinet for use by CPS for 15kV or 38kV differential relaying (ANSI C57.13 Classification C800 R.F.=1.33) shall be provided in accordance with the table below.


20.3.4 Current Transformers for CPS Metering. Three (3) current transformers

located on the load side of the breaker WYE connected and wired from the breaker cabinet to shorting blocks in the control cabinet for use by CPS for metering shall be provided in accordance with the table below. These current transformers may be mounted external to the breaker and shall be 0.3 accuracy class through B-0.5 burden on all taps and have R.F.=1.5.


20.4 Alarms. Alarms for loss of DC to spring motor (27-7), loss of AC to pneumatic, spring or hydraulic motor (27-6), loss of AC to breaker cabinet heaters (27-8) and low energy on breaker operating mechanism as shown on Drawing 6 of Specification 680-05 or 680-07 shall provide a signal to the annunciator panel and shall be wired to the control cabinet. The voltage alarm relays shall be Potter & Brumfield, KRPA series, socket mount type with Potter & Brumfield screw terminal. 21.0 DIFFERENTIAL AND OVERCURRENT RELAYING AND METERING 21.1 Relaying Operating Voltage Range. Relaying and alarms shall operate on 125V DC. The equipment shall be operational without loss of life in an operating range of 105V DC to 131V DC, and at a voltage of up to 150V DC for 24-hour duration during battery equalization charging. 21.2 Transformer Differential and Alarm Relaying and Other Devices. The following relays and devices shall be provided for transformer overcurrent and differential relaying in accordance with Drawings 4 and 5. Equipment shall be mounted and wired in the control cabinet. Provision shall be made on a terminal block in the control cabinet for an external 125 VDC source.


21.2.1 Lockout Relay (86T). One (1) manual reset, lockout relay shall be provided to trip the breaker, lockout the breaker, trip the high-speed fault-initiating switch, supervise the high-speed fault-initiating switch ground circuit, open the 138 kV motor-operated disconnect switch and lock open the 138 kV disconnect switch. This relay shall be an Electro-Switch type WL or a General Electric type HEA.

21.2.1.1 Contacts for CPS Use. One set of normally open and two sets of normally closed contacts from this relay shall be also wired to terminal blocks in the control cabinet for CPS use.

21.2.1.2 Lockout Relay Test Switch. A test switch shall be mounted adjacent to the lockout relay (86T) and shall be connected to interrupt the lockout relay tripping circuits.

21.2.2 Transformer Primary Differential relay (87TP). One (1) digital, current differential relay with percentage and harmonic restraint shall be provided for transformer protection. The relay shall be wired to trip the transformer lockout relay (86T) and breaker as programmed. The relay shall have a self-test alarm to provide a signal to the annunciator panel and be wired to the control cabinet. This relay shall be a Schweitzer Engineering Laboratories SEL-387, Model 0387614X534X4XX.

21.2.2.1 Test switch 30-Pole. One (1) flush-mounted, back connected,30-pole

test switch shall be provided and wired such that each current and output circuit of the 87TP (Section 21.2.2) may be opened for testing. This test switch shall be an ABB FT-19R FR3G073073073 (30 Pole current T/S).

21.2.3 Transformer Backup Differential Relay (87TBU). One (1) digital, current

differential relay with percentage and harmonic restraint shall be provided for transformer and breaker protection. The relay shall be wired to trip the transformer lockout relay (86T). The relay shall have a self-test alarm to provide a signal to the annunciator panel and be wired to the control cabinet. This relay shall be a Schweitzer Engineering Laboratories SEL-587, Model 0587103X531.

21.2.3.1 Test switch 30-Pole. One (1) flush-mounted, back connected,30-pole test switch shall be provided and wired such that each current and output circuit of the 87TBU (Section 21.2.3) may be opened for testing. This test switch shall be a ABB FT-19R FR3G073073073 (30 pole current T/S).

21.2.4 Loss of DC to Transformer Differential Circuit. Loss-of-DC relays shall be provided and connected to alarm for loss-of-DC to the transformer primary differential relay circuit (27-9) and to the transformer backup differential relay circuit (27-10). These relays shall be Potter and Brumfield Model KRPA11DG (110 volt DC, 10K ohm). Alarm contacts shall provide a signal to the annunciator panel and shall be wired to an interconnect terminal block in the control cabinet. The annunciator for this point shall not seal-in, but shall reset when the condition clears.


21.3 Breaker Overcurrent, Control and Alarm Relaying and Other Devices. The following relays and devices shall be provided for breaker overcurrent, control and alarm relaying and metering in accordance with Drawings 2 and 3. Equipment shall be mounted and wired in the breaker cabinet. Provision shall be made on a terminal block in the control cabinet for an external 125 VDC source. Breaker cabinet shall be provided in accordance with CPS Specification 680-05 or 680-07 with the exception that the cabinet may be mounted at the either end of the breaker.

21.3.1 Breaker Overcurrent Relay (50/51S). One (1) digital, directional overcurrent, reclosing, fault locating relay with independent breaker trip/close control switches and indicating lamps shall be provided for phase protection of the breaker. The relay should be wired to trip the breaker as programmed. The relay shall have “Output 107” configured as a normally closed contact. The relay shall have a self-test alarm and a separate alarm for loss of potential. Contacts for these alarms shall be separately wired to provide a signal to the annunciator panel and be wired to the control cabinet. This relay shall be a Schweitzer Engineering Laboratories SEL-351S, Model 0351S713545542X.

21.3.1.1 Test switch 30-Pole. One (1) flush-mounted, back connected,30-pole

test switch shall be provided and wired such that each current and output circuit of the SEL-351S(Section 21.3.1) may be opened for testing. This test switch shall be a ABB FT-19R FR3G073212036 (30 Pole T/S).

21.3.2 Breaker Supervisory Operation (201/T and 201/C). Two (2) interposing relays shall be provided for remote supervisory operation of the breaker. These relays shall be Struthers Dunn, Style 219XBXP (115-125VDC) with Socket 27390J. An arc suppression diode shall be wired in parallel with the relay coil. These relays shall be mounted so that the relay contacts move vertically. Coils of the relays shall be wired to an interconnect terminal block in the control cabinet. 21.3.3 Loss of DC to Breaker. One (1) loss-of-DC relay shall be provided and connected to alarm for loss-of-DC or trip coil failure (open circuit) at the breaker (27-11). The relay shall be a Potter and Brumfield Model KRPA11DG110. An “a” auxiliary switch of section 20.2.3 shall be connected in series with the contact to block the alarm when the breaker is open. Alarm contacts shall provide a signal to the annunciator panel and shall be wired to an interconnect terminal block in the control cabinet.

21.3.4 Ammeters. There shall be three (3) flush-mounted ammeters, one for each phase current. These ammeters shall be single-phase indicating 270° scale, switchboard class, 1% accuracy and shall have burden and overload ratings suitable for continuous operation in the current transformer circuit. The full-scale ampere indication shall be the same as the overall current transformer primary current rating.


21.3.5 Voltmeter. There shall be one (1) flush-mounted voltmeter with phase selector switch. This voltmeter shall be single-phase indicating, 270° scale, switchboard class, 1% accuracy. This meter shall read voltage from the 175:1 or 70:1 ratio potential transformers and shall indicate kilovolts to ground. 21.3.6 Power Factor Meter. There shall be one (1) flush-mounted power factor meter. 21.3.7 Transducers. The following transducers shall be provided by the Vendor:

a. One (1) three-phase, four-wire, watt transducer. b. One (1) three-phase, four-wire, var transducer. c. One (1) single-phase volt transducer.

d. Three (3) single-phase current transducer.

These transducers shall comply with CPS Specification 814-04. Transducers shall be 1800 watt (1500 watt are not acceptable). Terminals 1 and 2 of the transducers shall be wired to an interconnect terminal block in the control cabinet with three-pair and one-pair, twisted, Number 18 stranded copper, vinyl insulated, chrome-vinyl jacketed cable. 21.3.8 Test Switch. One (1) surface-mounted, front-connected, 10-pole, test switch for the transducers shall be installed next to the transducers. This test switch shall be either a Meter Device Company, Catalog A1609 with 209PF cover (or) a The Durham Company, Catalog 1757F-MS6012 with 7843FC-MS4242 cover. Currents and potentials shall enter the test switch from the bottom from terminal blocks in the breaker cabinet. 22.0 VOLTAGE TRANSFORMERS AND METERING FACILITIES 22.1 Voltage transformers. Three voltage transformers shall be connected wye-wye on the load side of the breaker. These voltage transformers shall be used as the source of potential for transducers, the SEL-351S digital relays, LTC control circuits, rotation indication, phase comparison and CPS metering of customer loads. The voltage transformers shall be 110 kV BIL, 0.3 accuracy class with W, X, M, Y burdens and shall be in accordance with Specification 420-08. Each voltage transformer shall have one primary current limiting fuse. The voltage transformers shall have been manufactured by General Electric. 22.2 Transducers. Nominal 120 volt rms potentials from all three phases of the voltage transformers and the neutral shall be brought to terminal points in the breaker cabinet for the transducer test switch of Section 21.3.8 and to the control cabinet for the sensing potentials of Section 6.2.4.


22.3 LTC Control Circuits. Nominal 120-volt rms potentials from two different phases of the voltage transformers shall be brought to terminal points in the control cabinet for the LTC Control Circuits of Section 6.2.4. 22.4 Metering. The following provisions shall be supplied for metering.

22.4.1 Metering Test Switch. The vendor shall wire potentials from the voltage transformers in Section 22.0 and the currents from the current transformers in Section 20.3.4 to a set of test switches. These test switches shall be Eastern Specialty Company 1098B, back-connected with the following color-coded handles: Left-to-right red, orange, green, white, red/red, orange/orange, green/green.

22.4.2 Wiring. CPS will wire its own meters to the top of the metering test switch. Facing the rear of the test switch, current and potential terminals to run 1, 2, 3, right-to-left. CT polarity wires shall enter on the shorting switch side of the current test switch section. All CT leads shall be brought to shorting blocks with all taps accessible for changing CT ratios before they enter the metering test switch. 23.0 PHASE DESIGNATION, ROTATION, COMPARISON AND MARKING 23.1 Phase Designation. Use 1, 2 and 3 for phase designation instead of letters. Associate phase 1 with H1, X1; phase 2 with H2, X2; and phase 3 with H3, X3. Refer to vector phase diagram Drawing 8 for details of rotation and phasing displacement. 23.2 Rotation Indicators. Potentials from the voltage transformers in Section 22.0 and the control power transformers in Section 19.0 shall be utilized for rotation indication. There shall be two (2) rotation indicators, one to indicate the phase sequence of the transformer and another to indicate the direction of pump rotation. The indicators shall be located in the control cabinet.

23.2.1 Transformer. The rotation indicator for the transformer shall be connected to the voltage transformers on the load side of the breaker.

23.2.2 Pump. The rotation indicator that monitors the pump circuit shall be provided by means of a phase reversing switch on the CPT circuit so that proper phase rotation is possible regardless of the high-voltage phase connections. A phase rotation indicator to indicate the direction of pump rotation shall be located on the load side of the reversing switch for checking this condition electrically.

23.2.3 Test Switch. The phase rotation indicator shall be equipped with a test

switch located in the control cabinet. 23.3 Phase Comparison. Potentials from the voltage transformers in Section 22.0 and the control power transformers in Section 19.0 shall be also utilized for phase comparison.


23.3.1 Phase Comparison Circuit. There shall be a phase comparison circuit to

check the phasing across the breaker. The circuit shall consist of three (3) white lights which illuminate upon the phasing being reversed across the open secondary breaker. The phasing shall be compared between the load side voltage transformers and the control power transformers. Auxiliary three-phase voltage transformers in the CPT circuit, connected delta-wye with a 2:1 ratio (240V to 120V), shall be used to shift the potentials in phase with the voltage transformer potentials for comparison purposes. There shall also be three-phase potentials from both sides wired to banana plug terminals in the control cabinet for CPS to make phase angle meter comparison reads. The connections for phasing shall always be connected to the control power transformer regardless of the transfer switch position.

23.3.2 Test Switches. The two (2) four-wire potential sources to the phase

comparison circuit shall have two (2) four-pole potential test switches located in the control cabinet to facilitate testing. 23.4 Instrument Transformer Polarities. All instrument transformers shall have easily identifiable polarity markings on both the primary and secondary wiring terminals. All multi-ratio current transformers shall have all ratios wired to shorting type terminal blocks for easy access for changing ratios. 24.0 SWITCHES AND MOTOROIZED OPERATOR 24.1 Breaker Disconnect Switches. Three single-phase, single throw, hook operated disconnect switches shall be provided. Switches shall be in accordance with CPS Specification 681-17, CPS Material Number 9003285 (1017326). These switches shall be located to allow phase checking with a phase stick when in the open position when paralleling the mobile unit substation with another transformer. Switch terminal pads and insulated support shall be provided to accommodate cables with terminators in accordance with the table below. CPS will furnish the cables and cable terminators. Royal, Turner or USCO shall manufacture the switches.

CPS Material No.

Number of Cables Per Phase

Voltage

Number of NEMA 4-Hole Pads Per Phase

9003500 Three 15 kV Three 9003502 Two 38 kV Two

24.2 Transformer Disconnect Switch. A three-pole, group operated, 138 kV, 1200 ampere, vertical break, air disconnect switch with arc restricting whips suitable for making and breaking transformer magnetizing currents, shall be mounted on a support structure on the 138kV side of the transformer. The disconnect switch shall be in accordance with CPS Specification 681-02, CPS Material Number 9003091. The switch shall have the following additional requirements:


24.2.1 Outer Pole Extension. The phase spacing between centerlines of the poles during operation shall not be less than 8 feet. Provisions shall be made for extension and retraction of the two outer poles by manual means using a hand crank (swing out design will not be acceptable). This structure shall be a very rigid design, not deflect excessively, and not require ground supports when extended. 24.2.2 Manufacturer. Southern States or Pascor shall manufacture the switch. 24.3 Fault-Initiating Switch. The disconnect switch shall be equipped with a one-pole, single throw, high-speed fault-initiating switch. The fault-initiating switch shall be in accordance with CPS Specification 681-05, CPS Material Number 9001390. The fault-initiating switch shall be wired and interconnected in accordance with Drawing 4.

24.3.1 The switch shall be connected to phase one of the 138kV disconnect switch and shall be connected directly to the semi-trailer frame with 4/0 stranded copper ground wire.

24.3.2 The switch shall be tripped by one (1) “a” contact from the transformer

differential lockout relay (86T), Section 21.2.1. Two (2) “b” contacts from the transformer differential lockout relay (86T), Section 21.2.1 shall be paralleled and used in the fault-initiating switch ground circuit.

24.3.3 One (1) “b” contact from the auxiliary switch of the fault-initiating switch shall be wired to the close circuit of the breaker to prevent the breaker from closing when the fault-initiating switch is closed.

24.3.4 Two (2) “a” contacts and two (2) “b” contacts from the auxiliary switch of the fault-initiating switch shall be wired to the control cabinet for CPS use.

24.3.5 One (1) “a” contact from the auxiliary switch of the fault-initiating switch shall provide a signal to the annunciator panel and be wired to an interconnect terminal block located in the control cabinet. The contact shall be used to provide open/close status of the fault-initiating switch.

24.3.6 One (1) “b” contact from the auxiliary switch of the fault-initiating switch shall be wired in series with the close coil of the motor operator to prevent the motor operator from closing when the fault-initiating switch is closed.

24.3.7 Manufacturer. Switch shall be manufactured by Southern States or Pascor.

24.4 Motorized Operator. The disconnect switch shall be equipped with a motorized operator. The motorized operator shall be in accordance with CPS Specification 681-06, CPS Material Number 9003254(1017257). Provision shall be made on a terminal block in the control cabinet for an external 125 VDC source. The motorized operator shall be wired and interconnected in accordance with Drawing 6.


24.4.1 The open coil and close coil of the motorized operator shown as points “T”

and “C” on Drawing 1 of Specification 681-06 shall be supervised with auxiliary “b” contacts of the breaker as provided for in Section 20.2.4 of this specification such that the motorized operator cannot be operated if the breaker is closed.

24.4.2 The close coil of the motorized operator shall be supervised with one “b”

contact from the transformer differential lockout relay (86T), Section 21.2.1.

24.4.3 The open coil of the motorized operator shall be activated with one “a” contact from the transformer differential lockout relay (86T), Section 21.2.1.

24.4.4 Two (2) interposing relays (201TMO and 201CMO) shall be provided for

remote opening and closing operation of the motorized operator. Contacts from these relays shall be in series with the auxiliary “b” contacts of the breaker of paragraph 24.4.1. These relays shall be Struthers Dunn, Style 219XBXP (115-125VDC) with Socket 27390J. An arc suppression diode shall be wired in parallel with the relay coil. These relays shall be mounted so that the relay contacts move vertically. Coils of the relays shall be wired to an interconnect terminal block in the control cabinet.

24.4.5 One (1) loss-of-DC relay shall be provided and connected to alarm for loss-of-DC at the motorized operator (27-12). The relay shall be a Potter and Brumfield Model KRPA11DG110. Alarm contacts shall provide a signal to the annunciator panel and shall be wired to an interconnect terminal block in the control cabinet.

24.4.6 One auxiliary switch “b” contact of the motorized operator shall be wired to the control cabinet to provide motorized operator status.

24.4.7 The trip coil of the transformer lockout (86T) shall be supervised with two auxiliary “a” contacts of the motorized operator such that the rapid pressure auxiliary relay (63X) will not trip the lockout if the motorized operator is open.

24.4.8 One auxiliary switch “a” contact of the motorized operator shall be connected in series with the contact of section 24.4.5 to block the alarm when the disconnect switch is open.

24.4.9 One auxiliary switch “a” contact and one auxiliary switch “b” contact of the motorized operator shall be wired to a terminal block located in the control cabinet for CPS use.

24.4.10 The close coil of the motorized operator shall be supervised with one (1) “b” contact from the fault-initiating switch.

24.4.11 Manufacturer. Southern States or ABB shall manufacture the motorized operator.


24.5 High-Voltage Line Lead Provision. Loops for attaching strain insulators shall be supplied on the high-voltage line side of the disconnecting switch for dead-ending the high-voltage line leads. 25.0 SEMI-TRAILER 25.1 General Requirements. The transformer and equipment described in this specification shall be securely mounted on a suitable semi-trailer, to comply with the “Texas Department of Transportation, Austin, Texas, Regulations for Oversize, Overweight, Permits” of latest issue. The mobile substation shall be designed to withstand, without damage, a maximum speed in transit of forty (40) miles per hour on a first class paved highway. Specific semi-trailer requirements and tractor requirements are given below and shown on drawings 10, 11 and 12. 25.2 Size. The mobile substation unit shall be no more than 13 feet 6 inches in height, 9 feet 6 inches in width and have a main trailer no longer than 77 feet with all axles attached and no longer than 49 feet with the rear most axle group removed. 25.3 Semi-Trailer Requirements. The semi-trailer shall be designed and equipped to meet the following requirements: 25.3.1 Jeep. The semi-trailer shall be furnished with a jeep (or dolly). 25.3.2 Tractor Compatibility. The semi-trailer and jeep shall be designed in such a manner that the tractor furnished by CPS shall be capable of handling the fifth wheel loading and hauling requirements of the semi-trailer. The semi-trailer jeep combination shall be designed such that when the semi-trailer is in the substation the jeep may be removed for maneuverability. No more than 80,000 pounds of weight shall be supported by the fifth wheel of the tractor when the jeep is removed.

25.3.3 Semi-Trailer Lights. The semi-trailer lights shall be in accordance with the State of Texas specifications and rated for use at 12 volts DC. Electrical connection socket shall be a standard TCP 61 or Cole Hersee 1235 6-point connector. The lighting and reflector capabilities of the trailer shall be designed for night operation or when the visibility is less than 1000 ft. The lighting requirements shall be as follows: a. Two (2) amber clearance lamps on front, one on each side near corner.

b. Two (2) amber side marker lamps, one on each side near front. c. Two (2) amber reflectors, one on each side near front.

d. One (1) amber reflector on each side centrally located on body of trailer.


e. One (1) amber side marker lamp on each side centrally located on body of trailer.

f. Two (2) red side marker lamps, one on each side near the rear. g. Two (2) red reflectors, one on each side near the rear.

h. Two (2) red stop lamps, on the rear, one on each side.

i. Two (2) red tail lamps, on the rear, one on each side.

j. Two (2) red reflectors, on the rear, one on each side.

k. Electric turn signal lamps on rear. l. Two (2) red or amber flashing hazard warning lamps, on the rear, one on each

side. m. Two (2) red clearance lamps on the rear, one on each side.

n. Outline lights for operation from a 12-volt battery on the tractor. 25.3.4 Semi-Trailer Axles. The semi-trailer shall be equipped with a triple-axle and double-axle combination with four foot minimum spacing between the first, second, and third axles, and between the fourth and fifth axles. There shall be a twelve-foot spacing between the third and fourth axles. This axle combination shall be rated 105,000 lbs. and be derated to 90% for Class “b” load zoned roads to give a total rear axle rating of 94,500 lbs. Although the manufactured may be capable of meeting weight requirements using a combination such as a double-axle and double-axle on the main trailer, CPS requires that a triple-axle grouping be furnished for trailer weights in excess of 45,000 pounds. The back double-axle shall be hydraulically steerable by manual control, and fixed while in transit. The steerable triple-axle group shall be designed to allow a minimum rotation of 17° both to the right and to the left of transport position but be fixed while in transit. CPS will remove the rear double-axle inside of substations for increased maneuverability. The rear double-axle must be designed to be easily removable. Dimensions on semi-trailer may vary dependent upon manufacturers design weight distributions. Dimensions shall be furnished in accordance with Section 31.0 g.

25.3.5 Jeep Axles and Loading. The semi-trailer jeep (bus) shall be equipped with

triple-axles. The total gross weight of the jeep shall be 60,000 pounds derated by 90% to 54,000 pounds for class “b” load zoned roads. The jeep shall be designed such that it has an adjustable fifth wheel for adjusting more or less load to the tractor, and shall be designed such that the axle spacing between the second axle of the jeep and the first axle of the tractor double axle is within Texas Highway Department regulations for class


“b” roads. Maximum tractor fifth wheel loading to be less than 36,000 pounds from the jeep and 80,000 pounds in the substation without jeep. Note axle requirements may vary based on manufacturer’s design weight distribution.

25.3.6 Semi-trailer and Jeep Brakes. The semi-trailer shall be equipped with double chamber spring air brakes on all axles with emergency breakaway feature. Fittings shall be supplied for connecting the brake system of the semi-trailer and jeep to the tractor. 25.3.7 Semi-Trailer and Jeep Tires. The semi-trailer and jeep shall be furnished with dual wheels equipped with 12-ply pneumatic 12.00 X 20.00 tires mounted on 10-hole Budd wheel rims.

25.3.8 Semi-Trailer and Jeep Suspension. The semi-trailer and jeep shall be supplied with air ride suspension to equalize the load while going over high spots. The suspension on the semi-trailer shall be designed to allow the easy removal of the rear double-axle by deflating the air ride suspension. Any blocks or wedges required for weight transfer shall be of steel (hardwood not acceptable). 25.3.9 Semi-Trailer Leveling Equipment. The semi-trailer shall be equipped with four air/hydraulic leveling jacks and for heavy-duty two-speed screw jacks for ease in leveling the mobile unit substation to within 5 degrees and removing the load from the tires. After the semi-trailer is leveled with the air/hydraulic leveling jacks, the screw jacks can be manually lowered and blocked for final site installation.

25.3.10 Semi-Trailer Landing Gear. The semi-trailer landing gear shall be set back far enough from the semi-trailer king pin to allow maneuverability of the jeep. The fifth wheel height for the jeep and tractor shall be 52 inches. The landing gear shall have a height adjustment range of 16-inch minimum and shall retract to give a minimum ground clearance for the profile view shown in Drawing 12. The operating mechanism shall make it possible for one man to connect or disconnect from the tractor or jeep. The landing gear bearing surface (sand shoe type) on the ground shall be flat and sized in proportion to the load on it with the tractor or jeep disconnected.

25.3.11 Semi-Trailer Accessories. The semi-trailer shall be supplied with the following additional accessories:

a. Chock blocks for holding the trailer stationary when disconnected from the tractor.

b. Fifth wheel plate and two inch diameter king pin suitable for 90 degree turning.

c. Fenders or equivalent to be supplied over all wheels. d. Mud flaps to prevent throwing mud to rear.


e. Towing eyes at end of trailer. f. Embossed instruction plates for air ride controls and air/hydraulic jacks. 25.3.12 Tilt. The semi-trailer shall be designed so that the substation can be tilted sideways up to an angle of twenty (20) degrees without overturning.

25.3.13 Storage Facilities. The semi-trailer shall be equipped with integral storage facilities for all equipment detached during transit and for all auxiliary equipment such as special wrenches, removable manual maintenance closing and opening devices and spare fuses.

25.3.14 Equipment Enclosure(s). All auxiliary power sources such as engine/compressor, engine/pump combinations, and associated batteries shall be protected in a metal housing(s). The top and sides shall be adequate to provide protection from the weather. The top shall be capable of supporting the weight of a 250-pound man. Louvered panels shall be used to provide ventilation and cooling as required. Doors, holes, and removable panels shall be provided for access to controls and gages, and for maintenance. 25.3.15 Padlocking Provisions. All equipment such as removable maintenance devices, and equipment enclosures, cabinets, and toolboxes shall be provided with a locking device and provisions for padlocking. 26.0 GENERAL CONSTRUCTION REQUIREMENTS 26.1 Additional Space Provision. Manufacturer shall provide additional space on the semi-trailer to accommodate equipment CPS will install upon receipt of the mobile substation unit. An area with dimensions 4 x 8-ft is required for a CPS installed RTU, radio and battery charger. An area with dimensions 3 x 5-ft is required for a CPS installed battery. It is not required the areas be adjacent to one another. Total weight of the CPS installed equipment will not exceed 1200 pounds. 26.2 Fasteners. All external fasteners used in the fabrication of the mobile unit substation shall be stainless steel or shall be galvanized per ASTM A153. 26.3 Paint. All metallic surfaces subject to atmospheric corrosion shall be prepared and painted in accordance with the Steel Structures Painting Council. Any surfaces which will be inaccessible after assembly shall be protected with coatings which will protect for the life of the equipment. 26.3.1 Coatings. The mobile unit substation shall be shop coated with a primer coat, an intermediate coat, and a finish coat with a total minimum dry film thickness of


4.0 mils. (Note: CPS reserves the right to review and approve alternate coatings proposed by manufacturers that would meet the intent of this specification.) 26.3.2 Color. The color of the exterior finish coat shall be Munsell Notation 5BG 7.0/0.4, ANSI No. 70 Light Gray. The interior of the main transformer tank and load-tap-changer (LTC) compartment and the interior of the control cabinet shall be white. 26.4 American Standards. All items (i.e. tires, fittings etc.) furnished with the mobile substation unit shall conform with American standard measures and gauges. 27.0 CPS INSPECTION, TEST AND ACCEPTANCE 27.1 General. Mobile unit substation including transformer, breaker, switches, relaying and all accessories shall be subject to inspection and acceptance tests by CPS representatives upon delivery to assure compliance with CPS requirements. 27.2 Preliminary Tests. CPS will perform dew point and core ground DC insulation resistance measurements on the transformer. If the results of the dew point measurement is not within the limit as required in Section 17.1.11, or if the core ground DC insulation resistance measurement is not within the limits published in the manufacturer's installation instructions, further test by CPS will not continue until an agreement can be reached to resolve these deficiencies. Should a transformer not meet dew point limits imposed by this requirement, the additional cost incurred by CPS to properly dry the transformer during final tests and acceptance outlined in Section 27.3 shall be substracted from the Purchase Order price. 27.3 Final Tests. Should the results of the dew point measurement and the core ground DC insulation resistance measurement prove satisfactory, CPS will conduct final tests. Should the results of the final tests prove satisfactory, CPS will notify the manufacturer in writing of acceptance of the mobile substation unit. The date of this letter will constitute the date of acceptance of the unit. Should the results of the final tests prove unsatisfactory, CPS will not accept the unit but rather will notify the manufacturer in writing of any known deficiencies and payment will not be authorized until the deficiencies are corrected or resolved by the manufacturer either in the field or at an off-site repair facility. Any such unit repaired by the manufacturer will be subject to final test again by CPS. If for any reason CPS should fail to perform final test on the unit within three months after the unit is delivered, or in the event of a unit found with deficiencies within three months of the unit being returned to CPS, CPS will notify the manufacturer in writing of acceptance of the unit. At the time CPS representatives conduct the final tests, appropriate weather conditions must exist in the local area. Delays in the tests due to inappropriate weather conditions are unavoidable and shall not result in any liability to CPS with respect to payment schedule or otherwise. 27.4 Manufacturer's Representative. The manufacturer shall provide a representative to witness the prelimnary test. The manufacturer may at their option provide a


representative during the final tests. CPS will provide two days notice to the manufacturer when the testing is scheduled to take place. The representative shall be available at the specified time or the manufacturer shall reimburse CPS for any expenses incurred by CPS for delays caused by the manufacturer. 27.5 Ownership. Ownership of the mobile substation unit will transfer from the manufacturer to CPS after the unit has been accepted by CPS. 28.0 DRAWINGS, MANUALS, EXCITATION CURVES AND TEST REPORTS 28.1 Drawings and Instructions. The manufacturer shall provide drawings and manuals containing all information necessary for installing, testing, operating and maintaining the mobile unit substation, including the semi-trailer. Such drawings shall include a detailed Master Bill of Material List showing all material to be furnished on the purchase order. All drawings must be 22 x 34-inches in size. With the exception of 31.1 b. all drawings, instructions, excitation curves and test reports shall be sent to the CPS Purchasing Division, Attn: Buyer’s Name.

a. Approval Drawings. No later than 120 calendar days after the receipt of the purchase order, the manufacturer shall provide nine (9) sets of approval drawings for the mobile unit substation. Approval drawings shall consist of a full set of all drawings including outline drawings, nameplate drawings, wiring diagrams, connection diagrams, CT excitation curves and the trailer information required in Sections 28.2.1 and 28.2.2. These drawings shall be returned approved as marked before any manufacturing begins.

b. Relay Instruction Books. No later than 30 calendar days after the receipt of the

purchase order, the manufacturer shall provide fourteen (14) copies of the instruction books for the Schweitzer Engineering Laboratories relay types SEL-351S and SEL-587.

c. Bill of Material. No later than 30 calendar days prior to delivery of the mobile unit

substation, three (3) copies of the Master Bill of Materials List shall be sent to the CPS Superintendent of Stores.

d. Certified Drawings and Instruction Manuals. No later than 30 calendar days prior

to delivery of the mobile unit substation, nine (9) sets of final “certified for construction” drawings and instruction manuals for the mobile unit substation shall be sent to CPS. An additional nine (9) copies of the Master Bill of Materials List shall be included with these final drawings.

e. Photographs. No later than 30 calendar days prior to delivery of the mobile unit

substation, the manufacturer shall supply one (1) set of six (6) photographs of each transformer core and coils. The prints shall be glossy and shall be a


minimum of 8” X 10” in size. The photographs shall show a view of each of the four sides, a top view of the core and coils after assembly and a top view of the core and coils after tanking and before the top of the transformer is installed.

f. Excitation Curves. No later than 30 calendar days prior to delivery of the mobile

unit substation, three (3) copies of excitation curves for each type of current transformer shall be mailed to CPS.

g. Service Manual. The manufacturer shall provide four (4) copies of the service

manual for the mobile unit substation shipped with the unit. The service manual shall contain all necessary maintenance information including disassembly, adjustments, parts tolerances, complete parts breakdowns, and step-by-step maintenance instructions for the entire transformer, controls, and LTC. The Service Manual shall be updated with all service advisories reflecting modifications and design changes for as long as CPS owns the unit.

i. As-Built Drawings. Within 15 calendar days after shipment of the mobile unit

substation, the manufacturer shall provide final "as-built" drawings in a Bentley Systems Microstation 5.x design file format (preferred), Autocad DWG format or DXF format on one of the following media: CD-ROM (preferred media), 3-1/2” diskette, or DVD ROM. A full size hard copy of each drawing shall be sent with the files. The quality of these hard copies shall be adequate for visual verification of the computer files.

j. Checklist. Within 15 calendar days after shipment of the transformer, the

manufacturer shall provide one (1) copy of the completed “Manufacturer’s Checklist” (Appendix B) as outlined in Section 34.0 for each transformer ordered.

28.2 Trailer/Unit Information 28.2.1 Permit Drawings. Manufacturer shall furnish two drawings on 8-1/2 X 11 size paper showing center-to-center axle dimensions and axle weights for the trailer in two transport positions. One shall show the trailer-jeep-tractor in the largest length possible combination of fifth wheel positions. The second drawing shall show the trailer in the shortest or most compact fifth wheel positions. These drawings will be used for permit requirements in Texas. 28.2.2 Maintenance and Operation Information. Complete outline drawings with trailer dimensions and all available trailer component part numbers, diagrams, and operation literature required for future maintenance and operation shall be provided. Manufacturer shall furnish a complete listing of trailer components including but not limited to:


a. trailer manufacturer and address b. air-hydraulic manufacturer and address c. air-hydraulic schematic and design pressures d. air brake manufacturer and address e. air brake line schematic f. trailer axle manufacturer and address g. air ride suspension component manufacturer(s) and address(es) h. air ride suspension line/valve schematic i. steerable axle component manufacturer(s) and address(es) j. steerable axle line/valve schematic

28.2.3 On Site Instruction. The manufacturer shall arrange for a representative to provide on site demonstration and training of CPS personnel on the proper operation of the trailer and air/hydraulic systems at the delivery site. 28.3 Drawing Format Requirements. Wiring diagrams shall show wire connections at devices being connected. A list of wire connections drawn separate from devices will not be accepted. 28.4 Test Reports

28.4.1 Insulating Oil. Four (4) copies of the certified insulating oil test report shall be mailed to CPS within 15 calendar days after shipment of the mobile unit substation.

28.4.2 Transformer and Control Equipment. Four (4) copies of the certified transformer test reports listed in 17.4 shall be mailed to CPS within 15 calendar days after shipment of the mobile unit substation.

29.0 ENVIRONMENTAL 29.1 PCB Statement of Compliance. The manufacturer shall provide to the CPS Environmental Section a "Statement of Compliance" that all items used in the construction of the transformer are PCB free (less than 1.0 ppm PCB) and meet any federal, state, or other governmental regulation that restricts maximum PCB content to a lesser value. Items include but are not limited to the transformer tanks, LTC, bushings, transformer oil used during testing, and capacitors. The manufacturer shall provide a


“PCB Free” label on all motor and control capacitors. The Statement of Compliance shall be sent to the MSDS Data Manager, 100406, P.O. Box 1771, San Antonio, TX 78296-1771. 29.2 Leaks. During the warranty period, the manufacturer shall be liable for material, equipment and labor costs required for repair and clean up due to leaks caused by the manufacturer’s design, workmanship or defective materials. 29.3 Material Safety Data Sheet (MSDS). The manufacturer shall provide copies of the MSDS for any oil, chemical or other applicable substance component supplied in or with the transformer and/or accessories as required by OSHA Communication Standard 29 CFR 1910.120. This requirement applies to any substance for which CPS would be required to have an MSDS due to CPS personnel either using or being exposed to the substance while inspecting, operating or maintaining the transformer. MSDS(s) shall be received prior to or with first delivery. The manufacturer is also responsible for providing any updates of respective MSDS(s). All MSDS(s) and updates shall be sent to the MSDS Data Manager, 100406, P.O. Box 1771, San Antonio, TX 78296-1771. One copy of each MSDS shall be supplied with each packing list. One copy of each MSDS shall be supplied with each manual. 30.0 WARRANTY The manufacturer shall fully warrant all components of the mobile unit substation against defective materials and workmanship for a period of five (5) years from the date of acceptance of the mobile unit substation by CPS. The manufacturer shall bear all direct costs of correction and replacement of the defective materials or workmanship during the warranty period. The manufacturer shall bear all costs and responsibilities for transporting the mobile unit substation and/or components to and from the CPS storage site. If the mobile unit substation is removed from service for repair work subject to the warranty during the fifth year of the warranty period, the warranty period shall be extended such that the repaired mobile unit substation will be covered by warranty for one (1) year from the date of return acceptance by CPS. If the mobile unit substation is removed from service for repair work subject to the warranty during the first four years of the warranty period, the warranty shall be extended one (1) day for each day the mobile unit substation is out of service. CPS reserves the right to witness testing at the manufacturer's testing facility of any CPS transformer that has been repaired under the manufacturer's warranty. Should CPS elect to witness transformer testing, the manufacturer shall provide transportation and accommodations and cover all other reasonable expenses for two CPS witnesses.


CPS reserves the right to locate and operate the mobile unit substation throughout the CPS service area at any time during the warranty period. Such location(s) shall not in any way relieve the manufacturer of the warranty requirements set forth above. 31.0 PROPOSAL INFORMATION REQUIRED FROM MANUFACTURER The manufacturer shall provide the following information with his proposal:

a. Completed “Proposal Data Sheet” (Appendix A). The Proposal Data Sheet will be used by CPS to evaluate the manufacturer’s proposal. All of the information requested on the Proposal Data Sheet shall be furnished.

b. Outline Drawings c. Evidence of Quality Control Certification d. Descriptive literature of the transformer and accessories, including type of

construction, features of design and catalog numbers of important accessories, such as tap changer and bushings.

e. List of all equipment and material which is of non-USA supply or manufacturer.

Information shall include availability of spare parts and service for each item. f. Manufacturer's acceptable core ground test limits for all cores in the transformer

g. Trailer outline drawing showing maximum length, height, width, axle dimensions

and total gross loading for each axle. This drawing will be taken by CPS to the Texas Department of Transportation for preliminary permit approval for class “b” load zoned roads.

h. List all tests which the manufacturer will be performed on the mobile substation

unit and specifically the transformer. i. Detailed method manufacturer proposes to to utilize for providing control power

and voltage indication for the load tap changer. j. List of locations of the transformer where Nomex insulation will be used and

where conventional cellulose materials will be used. For conventional cellulose materials, manufacturer shall address how average oil rise temperature limits from ANSI will be met.

k. Inclusion of all reasonable costs and expenses incurred by CPS to send two (2)

CPS representatives to the manufacturer’s facility on two separate occasions during the course of the manufacturing of the mobile substation unit. The two


visits shall be to witness coil and core tanking (section 33.1) and to witness testing (section 17.5). Design review (section 36.0) will be held at CPS.

l. Design features to prevent the tripping of the mobile substation unit upon partial

loss of cooling capability under light load conditions.

m. Design features of the LTC including placement, ratings and type. 32.0 MANUFACTURER’S CHECKLIST The manufacturer shall complete the “Manufacturer’s Checklist” (Appendix B) and shall submit the completed form to CPS in accordance with Section 31.1 (Item i). A copy of the checklist shall be available for inspection by CPS at any time. CPS provides this checklist to assist the manufacturer in meeting important milestones in the construction of the transformer. 33.0 MANUFACTURING PROCESS AND UNUSUAL EVENT OR DAMAGE 33.1 Manufacturing Process. CPS reserves the right to inspect final Core and Coil Assembly after the final drying process prior to permanent tank installation and to witness the Core and Coil Assembly installation in the tank. Should CPS elect to witness these processes, the manufacture shall reimburse CPS for all reasonable costs and expenses incurred by CPS to send two (2) CPS representatives. 33.2 Unusual Event or Damage. The manufacturer shall notify CPS within 24 hours of any unusual event or damage occurring during the fabrication or testing of the transformer. CPS reserves the right to inspect such damages. Corrective measures shall be subject to acceptance by CPS. 34.0 MANUFACTURING DEFICIENCIES AND EXPENSE REIMBURSEMENT Should CPS, in its reasonable opinion, determine that the mobile unit substation is not being engineered, designed, assembled, etc. in accordance with CPS requirements, or that the manufacturer is failing to meet its obligations under this Agreement, then CPS will notify the manufacturer in writing of the purported deficiencies and the applicable requirement(s) not satisfied by the manufacturer. Upon receiving such notice, the manufacturer shall take all necessary action to correct such deficiencies in an expedient manner and give CPS assurance that such corrective measures have been taken. If the manufacturer fails to provide such assurance within a ten (10) day period of receiving such notice from CPS, CPS reserves the right to take whatever reasonable steps are necessary to obtain this assurance including, but not limited to, inspecting the manufacturer’s facilities, inspecting and reviewing designs, components and materials used in the manufacture and assembly of the mobile unit substation, witnessing manufacture and assembly of applicable components, and witnessing tests on the mobile unit substation at the manufacturer’s facilities. The manufacturer shall reimburse


CPS for all reasonable costs and expenses incurred by CPS in obtaining assurance that the manufacturer has corrected the deficiencies and is in compliance with the CPS requirements and this Specification. If the manufacturer fails to provide said assurances and/or fails to comply with the above requirements, CPS reserves the right to withdraw the order for the mobile unit substation and to place the order with another manufacturer. In the event CPS withdraws the order, CPS reserves the right to suspend the manufacturer from all mobile unit substations covered by the specification. The suspension will be in accordance with Section 37.8. 35.0 COMMUNICATIONS, TRANSACTIONS AND DOCUMENTATION All communications and transactions, oral and written, shall be conducted in English, and all documentation shall be in English with all measures (dimensions, weights, characteristics, etc.) in English units. This shall include, but shall not be limited to, the following:

a. Telephone or in-person contact between CPS personnel and the vendor or manufacturer

b. Written correspondence including manufacturer request for approval, bids,

proposals, etc. c. Documentation including drawings, design details, fabrication details, technical

manuals, test reports, etc. d. Equipment labels and markings

36.0 DESIGN REVIEW Subsequent to CPS receiving approval drawings from the manufacturer and prior to material ordering and manufacturing, engineering representatives from the manufacturer shall participate with CPS representatives in a comprehensive design review meeting covering all aspects of the mobile unit substation design and manufacturing. Approval drawings will not be returned until after the review is completed. The review meeting shall be held at the offices of CPS. 37.0 REQUIREMENTS AND PROCEDURES FOR PRODUCT AND MANUFACTURER APPROVAL The manufacturer shall meet the requirements of CPS Specification 000-01 and the following additional requirements.


37.1 A separate request shall be submitted for each transformer size and type for which approval is requested. 37.2 The manufacturer shall have been in operation for a minimum of five (5) years, in the United States. 37.3 The proposed transformer design shall have been in service for a minimum of five (5) years. 37.4 The manufacturer shall have a CPS approved facility to perform all repairs on the transformer, provide technical support, and provide spare parts. This facility shall have been in operation for a minimum of two (2) years with a minimum of one (1) year experience with the proposed transformer design. 37.5 The manufacturer shall provide, as part of the approval process, a factory inspection by two CPS representatives. The manufacturer shall provide transportation and accommodations and cover all other reasonable expenses incurred by CPS in conducting the inspection. Each plant where the proposed transformer is to be manufactured must be inspected and approved. The factory inspection shall include, but shall not be limited to, the design, manufacturing, testing and packaging processes. 38.0 SHIPPING INSTRUCTIONS 38.1 General Instructions. The mobile unit substation shall be prepared for shipment as indicated below. Any items, which do not meet all of the requirements of this specification, shall not be shipped to CPS. The manufacturer shall not ship the mobile unit substation until CPS approves the test results for all the tests listed in Section 17.4. Unless approved by CPS, the manufacturer shall not ship any damaged mobile unit substation. The manufacturer shall be responsible that no damage is incurred during shipment. 38.2 Assembly. The mobile unit substation shall be delivered completely assembled along with the jeep. The mobile unit substation transformer and other accessories with oil containment shall be delivered oil filled. The mobile unit substation shall be such that it can be safely stored outdoors indefinitely. 38.3 Shipment. Mobile unit substation may be shipped either by rail or delivered by a Vendor furnished tractor. CPS will specify the required delivery destinations on the Request for Quotation. The manufacturer shall be responsible for meeting all federal and state transportation requirements for permits and insurance. 38.3.1 Rail Shipment. Mobile unit substation shipped by rail shall be delivered to the CPS designated rail siding on a depressed-center rail car equipped with freight master type end-cushioned coupling. The Vendor shall make provisions for removing the mobile unit substation from the railcar to the pavement.


38.3.2 Tractor Delivery. Mobile unit substation delivered by tractor shall be

delivered to the CPS designated storage site by a Vendor supplied tractor.

38.3.3 Impact Meters. Two (2) recording impact meters, supplied by the manufacturer, shall be directly mounted on opposite ends of the mobile unit substation during shipment. Impact meters shall be a 3-way type for recording both longitudinal, horizontal and vertical impacts. CPS will retain the recording tapes.

38.4 Mobile Unit Substation Delivery and Receiving. 38.4.1 Notification of Delivery. The CPS Supervisor of Substation Construction, Maintenance and Test shall be notified of intended delivery of the mobile unit substation three (3) full working days (Monday thru Friday except holidays) prior to actual delivery. Notification shall be faxed to 210-353-4592 (Attn: Supervisor of Substation Construction, Maintenance and Test) and the fax cover sheet shall boldly indicate “IMPORTANT NOTICE.” 38.4.2 Shipping Weights. Prior to delivery, the manufacturer shall fax the shipping weight of the mobile unit substation to 210-353-4592, Attn: Supervisor of Substation Construction, Maintenance and Test. This information shall be identified with the CPS Purchase Order number. 38.4.3 Receiving. CPS will receive delivery of the mobile unit substation on working days between 9:00 AM and 2:00 PM only. 38.5 Shipment Inspection

38.5.1 Third Party Inspection. At no time during shipment prior to delivery to CPS shall the transformer of the mobile substation unit be opened to atmospheric conditions for internal inspection unless such inspection is necessitated by legal requirements.

38.5.2 Manufacturer Responsibility. In the event of such internal inspection, a

representative of the manufacturer shall be present and the following requirements shall be met.

a. Provisions shall be made to prevent outside atmospheric contaminants from entering the unit. b. After the internal inspection is completed, the unit shall be re-sealed and re-pressurized with dry air in conformance with Section 17.1.11. The unit shall be leak tested to insure the pressure will remain constant for the duration of the transport to the designated job site.


38.5.3 Inspection Witness. CPS reserves the right to witness any inspection of the transformer during shipment including any inspection the manufacturer may conduct. As a minimum to the extent possible, manufacturer shall provide CPS twenty-four (24) hour advanced notice of intent to conduct such an inspection.

38.6 Delivery Ticket. A delivery ticket must be furnished by the carrier of the mobile unit substation to CPS. The delivery ticket shall indicate the CPS Purchase Order number. 38.7 Packing List. Complete packing list shall be sent with the shipment of the mobile unit substation showing the CPS Purchase Order number. One copy of each Material Safety Data Sheet shall be supplied with the packing list (Section 29.3).

a. One (1) copy of the packing list shall be shipped with the mobile unit substation. b. One (1) copy of the packing list shall be mailed to City Public Service, Mission

Road Storeroom, 613 Mission Road, San Antonio, Texas 78210, immediately upon completion of delivery preparations.

38.8 Rail Demurrage. CPS will not be responsible for charges for rail demurrage beginning the later of four (4) working days after notification of delivery or forty-eight (48) hours after actual delivery of the transformer to the rail siding. Provided the transformer is delivered and notification is given as specified in Section 38.4, CPS will have two working days to prepare for delivery and two days to inspect ans to unload the transformer from the rail car before any charges to CPS start accruing. Any charges for demurrage prior to this time or charges resulting from failure to notify CPS of the intended delivery as specified in Section 38.4.1 are the responsibility of the manufaxturer. 39.0 GENERAL INSTRUCTIONS 39.1 Ordering Information. The Requisition, Requests for Quotation and Purchase Order for the mobile unit substation covered by this Specification will contain the following information: a. A brief description of the mobile unit substation. b. Reference to this specification.

c. Reference to Specifications.000-01, 680-07, 681-02, 681-05, 681-06 and 814-04. d. Delivery destination

e. Delivery date.


f. Special instructions not covered by this Specification. 39.2 Copies of Specifications. Copies of this specification and of related CPS Specifications 000-01, 680-05, 680-07, 681-02, 681-05, 681-06, and 814-04 may be obtained from the Purchasing Division of CPS. 39.3 Exceptions. Any and all exceptions to this specification must be listed individually on the Proposal Data Sheet submitted with the quotation. If there are no exceptions, the words "NO EXCEPTIONS" must be written on the Proposal Data Sheet and the quotation. 424-60.doc. 11/11/04 2:59 PM: eg: BHJ

CPS Specification 424-60 Appendix Page A1

PROPOSAL DATA SHEET

Requisition Number

Item Number

Name of Manufacturer

Guaranteed Audible Sound Level

AC Station Service Requirements of the Transformer in kVA At No-Load and Full-Load

Transformer Impedance

Approximate Transformer Weight in Pounds

Core and Coils

Tank and Fittings

Oil

Bushings

Total Assembled Transformer with Oil

Total Gallons (U.S.) of Oil

CPS Specification 424-60 Appendix Page A2

PROPOSAL DATA SHEET Transformer Dimensions in Inches

Overall Height

Overall Width

Overall Depth

Height Above Tank

Height for Untanking

Height of HV Bushing

Number of Heat Exchangers

Fans per Heat Exchanger

Horsepower per Fan

The manufacturer hereby declares that the following list states any and all variations from and exceptions to the requirements of the specification. If no exceptions are taken by the manufacturer, indicate below by entering “No Exceptions.”

(For list of exceptions, attach additional pages, if necessary)

CPS Specification 424-60 Appendix Page B1

MANUFACTURER’S CHECKLIST INSTRUCTIONS TO MANUFACTURER In order to more efficiently and effectively conduct the transfer of information regarding the quality assurance as well as coordination between the manufacturer and CPS, the following checklist is being provided. The manufacturer shall address all items listed below and make proper indication in the space provided. In most cases, the appropriate date and initials of person(s) responsible for the completion of this document shall constitute the completion of each individual item listed.

ITEM(Date and initial each item upon completion)

DATE INITIALS

1. AFTER RECEIPT OF CPS PURCHASE ORDER (PO). Within 120 days of receipt of Purchase Order, nine (9) sets of the following approval information shall be supplied to CPS: • Outline drawings including shipping weight ____________ _________

• Nameplate drawings ____________ _________

• Schematic, interconnect wiring and wiring diagrams

____________

_________

• CT excitation curves ____________ _________

• Trailer information of Section 28.2.1 ____________ _________

2. MANUFACTURING • Assembly Check (Disconnect Switch) ____________ _________

• Assembly Check (Breaker) ____________ _________

• Assembly Check (Heat Exchangers) ____________ _________

• Assembly Check (High Speed Switch) ____________ _________

• Assembly Check (Motor Operator) ____________ _________

• Assembly Check (AC Station Service) ____________ _________

• Assembly Check (Relays and Alarms) ____________ _________

• Assembly Check (Voltage Transformers) ____________ _________

• Assembly Check (Trailer) ____________ _________

• Assembly Check (Brackets) ____________ _________


MANUFACTURER’S CHECKLIST Operational Checks:

• Relays and Alarms ____________ _________

• Heat Exchangers ____________ _________

• LTC ____________ _________

• Motor Operator ____________ _________

• Disconnect Switch ____________ _________

• High Speed Fault-Initiating Switch ____________ _________

• AC Station Service ____________ _________

• Breaker ____________ _________

• Voltage Transformers ____________ _________

• Trailer ____________ _________

Unusual events or damages occurring during manufacture of transformer or accessories were reported within 24 hours. List events with time, date and name of person contacting CPS. Event 1: ___________ _________ _________________________________________ _________________________________________ _________________________________________ Event 2: ___________ _________ _________________________________________ _________________________________________ _________________________________________ (continue on separate page, if necessary, and attach hereto)


MANUFACTURER’S CHECKLIST 3. FACTORY TESTING • Notified CPS three (3) weeks prior to factory

testing of transformer

___________

_________ A. The following tests were performed with original bushings installed: • Resistance Measurements ____________ _________

• Ratio Tests ____________ _________

• Polarity and Phase Relation Tests ____________ _________

• Excitation Losses and Percent Excitation Current Measurements

____________

_________

• Percent Impedance and Load Loss Measurements

____________

_________

• Lightning Impulse Tests ____________ _________

• Applied Potential Test (100% test level) ____________ _________

• Induced Voltage Test and Partial Discharge Measurement

____________

_________

• Insulation Power Factor Measurements ____________ _________

• Doble Excitation Measurements ____________ _________

• Insulation Resistance Measurements ____________ _________

• Audible Sound Level ____________ _________

• Temperature Rise (24 Hour) and DGAs ____________ _________

• Excitation (110%) and DGAs ____________ _________


MANUFACTURER’S CHECKLIST B. Witnessing and Test Results • Factory tests witnessed by CPS (leave blank if

not witnessed)

____________

_________

• Test results (Section 19.4) faxed to the CPS Supervisor of Substation Engineering and Protection at 210-353-4449

____________

_________ C. Tests were performed with transformer filled with dry air and bushings removed: • Core ground DC resistance measurement

(meggar)

____________

_________

• Dew point measurement (24 hours after dry-air fill)

____________

_________

4. PRE-SHIPPING REQUIREMENTS Not later than 30 calendar days prior to delivery of the mobile unit substation, the manufacture shall provide the following for each transformer ordered: • Final drawings and instruction manuals - 9 sets ____________ _________

• Photographs of core and coils - 6 total ____________ _________

• Master Bill of Material list(s) - 9 copies ____________ _________

• Excitation Curves- 3 copies ____________ _________


MANUFACTURER’S CHECKLIST Final Packing Requirements: • Delivery Ticket - to include the CPS Purchase

Order Number and the number of cartons, packages or containers being delivered

____________

_________

• Packing List(s) - to include the CPS Purchase Order Number, carton number and part number

One (1) copy per rail car or truck (attached to unit)

One (1) copy (immediately after completion of packing of rail car or truck) to be mailed to: City Public Service, Mission Road Storeroom, 613 Mission Road, San Antonio, Texas 78210

____________

_________

• Impact Meters installed ____________ _________

• Notification of arrival - The CPS Supervisor of Substation Construction, Maintenance and Test shall be notified three full working days prior to intended arrival of the mobile unit substation (Fax No. 210-353-4592)

____________

_________


MANUFACTURER’S CHECKLIST 5. SHIPPING REQUIREMENT • Service Manual

____________

_________

6. POST SHIPPING REQUIREMENTS Within 15 calendar days after shipment of the mobile unit substation, the following items shall be received by CPS: • Computer drawings

____________

_________

• Manufacturer’s Checklist

____________

_________

• Four (4) copies of Certified Test Reports (to include bushing manufacturer power factor and capacitance test reports)

____________

_________ 7. FINAL INSTRUCTIONS This form shall be completed and sent to CPS. Send to:

City Public Service Purchasing Division, Attn.: (Buyer’s Name) PO Box 1771 San Antonio, Tx. 78296-1771


MANUFACTURER’S CHECKLIST

424-60

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