Technical Description DD- /10.06.2014

TELECONTROLLED OVERHEAD MEDIUM VOLTAGE

LOAD BREAKERS OF SF6 or VACUUM TYPE

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CONTENTS

1. SCOPE ................................................................................................................................................................. 3 2. STANDARDS .................................................................................................................................................... 3 3. OPERATING CONDITIONS ......................................................................................................................... 4 4. GENERAL ............................................................................................................................................................... 5 5. MINIMUM TECHNICAL REQUIREMENTS ............................................................................................. 5 6. BASIC FEATURES .............................................................................................................................................. 5

6.1. DESIGN ....................................................................................................................................................................... 5 6.2. OPERATING MECHANISM ......................................................................................................................................... 6 6.3. PROVISION FOR REMOTE CONTROL ....................................................................................................................... 6 6.4. CONNECTION ............................................................................................................................................................. 7 6.5. DEGREE OF PROTECTION ......................................................................................................................................... 7 6.6. EARTHING ................................................................................................................................................................... 7 6.7. BREAKING AND DISCONNECTING ........................................................................................................................... 7 6.8. INSULATORS AND BUSHINGS .................................................................................................................................. 8 6.9. PROTECTION AGAINST CORROSION ........................................................................................................................ 9

7. CONTROL PANEL OF THE LBS ................................................................................................................... 9 7.1. CONTROL PANEL - RTU ........................................................................................................................................... 9 7.2. FUNCTIONS AND CAPABILITIES OF THE RTU – CONTROL CABINET ................................................................ 11 7.3. DEGREE OF PROTECTION ....................................................................................................................................... 11 7.4. PROTECTION AND SAFETY ....................................................................................................................................... 11

8. FAULT DETECTION ......................................................................................................................................... 12 9. THREE CURRENT TRANSFORMERS (3 SINGLE PHASE) ......................................................... 13 10. ONE VOLTAGE TRANSFORMER (DOUBLE PHASE) FOR POWER SUPPLY ................... 14 11. SIX ELECTRONIC VOLTAGE SENSORS (CAPACITIVE) ......................................................... 14 12. COMMUNICATION CAPABILITIES.................................................................................................... 14

12.1. MEANS OF COMMUNICATION .............................................................................................................................. 14 12.2 COMMUNICATION WITH EXISTING CENTRAL CONTROL SYSTEMS .................................................................... 14

13. PROTOCOL CONVERTER (GATEWAY) .............................................................................................. 15 14. GSM/GPRS ROUTERS............................................................................................................................... 15

14.1. GENERAL FEATURES ............................................................................................................................................. 15 14.2 STANDARDS–SPECIFICATIONS–INSTRUCTIONS .............................................................................................. 16 14.3. ANTENNA ............................................................................................................................................................... 16 14.4. INSTALLATION ....................................................................................................................................................... 17 14.5. SPECIAL TERMS .................................................................................................................................................... 17

15. TESTS .................................................................................................................................................................. 17 15.1 TYPE TESTS ............................................................................................................................................................. 17

15.1.1. Type tests for RTU ................................................................................................................................ 18 15.1.2. Type tests for Load Breaker and supply voltage transformer ......................................... 18

15.2 ROUTINE TESTS ...................................................................................................................................................... 19 15.3 SAMPLE TESTS (FACTORY ACCEPTANCE TESTS - FAT) ................................................................................ 19

16. SPARE PARTS................................................................................................................................................. 20 17. SPECIAL INFORMATION THAT MUST BE GIVEN WITH THE BID - REFERENCES ... 20 18. DOCUMENTATION...................................................................................................................................... 21 19. TRAINING ....................................................................................................................................................... 22 20. GUARANTEE................................................................................................................................................... 22 21. NAMEPLATES AND MARKING ............................................................................................................. 23 22. PACKING ......................................................................................................................................................... 24

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Technical Description DD- /10.06.2014

TELECONTROLLED OVERHEAD MEDIUM VOLTAGE

LOAD BREAKERS OF SF6 or VACUUM TYPE

1. SCOPE

This specification covers the general requirements of design, manufacturing, testing, supply, delivery and performance requirements of three phase, SF6 gas insulated or

vacuum Load Break Switches (LBS) for medium voltage (20 and 15 kV) overhead power distribution systems, with RTU.

2. STANDARDS

This TD is based on the following standards: IEC International Electrotechnical Commission

- IEC 62271-1:High-voltage switchgear and controlgear - Part 1: Common specifications - IEC 62271-100: High-voltage switchgear and controlgear - Part 100: Alternating

current circuit-breakers - ΕΝ 62271-102: 2001: High-voltage switchgear and controlgear - Part 102: Alternating

current disconnectors and earthing switches

- IEC 62271-103: High-voltage switchgear and controlgear - Part 103: Switches for rated voltages above 1 kV up to and including 52 kV

- ANSI/IEEE C37.63 Requirements for Overhead, Pad-Mounted, Dry Vault, and Submersible Automatic Lines Sectionalizers for Alternating Current Systems

- IEC 60068-2-17: Basic environmental testing procedures. Part 2: Tests – Test Q:

Sealing - IEC 60059: IEC standard current ratings

- IEC 60-870-2-1 Telecontrol systems – operating conditions - IEC 60071-1 & 60071-2: Insulation Coordination - IEC 60129: Alternating Current Disconnections (Isolators) and earthing switches

- IEC 60376: Specification of technical grade SF6 for use in electrical equipment - IEC 60273: Characteristics of Indoor & Outdoor Post Insulators for Systems with

Nominal voltage greater than 1000 V - IEC 62217:2005: Polymeric insulators for indoor and outdoor use with a nominal

voltage >1000V – General definitions, test methods and acceptance criteria

- IEC 61952: 2008: Insulators for overhead lines – Composite line post insulators for A.C. systems with a normal voltage greater than 1000V. - Definitions, test methods

and acceptance criteria - IEC 60383-1:1993: Insulators for overhead lines with a nominal voltage above 1000V –

Part 1 Ceramic or glass insulator units for a.c. systems. Definitions, test methods and acceptance criteria

- IEC 60437: Radio Interference test on high-voltage insulators

- IEC 60507: Artificial pollution tests on high-voltage insulators to be used in alternating current systems

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- IEC 60529: Degrees of protection provided by enclosures (IP code) - IEC 60060-2: High voltage test techniques

- IEC 60815: Guide for the selection of insulators in respect of polluted conditions - IEC 61869-2: Additional requirements for current transformers

- IEC 61869-3: Additional requirements for inductive voltage transformers - IEC 60044-7: Requirements for electronic voltage transformers - IEC 600044-2: Requirements for Voltage Transformers

ISO International Organization for Standardization

- EN ISO 1460:1999: Hot dip galvanized coatings on iron and steel - ISO 1459: Metallic Coatings -Protection against Corrosion by Hot Dip Galvanizing –

Guiding Principles

- ISO 9000: Quality management and quality assurance standards -Guidelines for selection and use.

Harmonized European Standards or Other - EN 10882-2: 20.06.2005: Stainless steel flat products for general purpose.

- ΧΚ 11.02/11.03.2008: Hot dip galvanizing in iron and steel hardware - ΧΚ 11.04/ 11.03.2008: Electrolytic tin plating

Where any provision of this specification differs from those of the standards listed above, the provision of this specification shall apply. In case of conflict, the order of

precedence shall be: This specification

IEC standards, in the sequence listed above.

3. OPERATING CONDITIONS 3.1 Environmental conditions

The product shall be suitable for operation outdoors, under the following

environmental conditions: Ambient temperature: -20°C to +50°C with the presence of ice or snow. Altitude: Up to 1000 meters above sea level.

Isokeraunic level: Mean value 25, max 100 Exposure to solar radiation: More than 2800 hours annually

Relative humidity: 15% to 95% Areas of coastal salt spray and / or industrial pollution with equivalent salt

deposit densities in the range 2.0 to 3.0 g/m2

3.2 Distribution system characteristics

LBS is intended to be used in a three phase three wire network, grounded at the sending end (MV node of HV/MV substation), through a resistance limiting the single

phase earth fault current to 1000A. MV network shall have the following characteristics:

Nominal system voltage: 15 kV and 20 kV. Maximum system voltage: 24 kV.

Rated frequency: 50 Hz. Short circuit level: 250 MVA.

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4. GENERAL

The three phase LBS, SF6 gas insulated or vacuum type, will be used in 20kV or 15kV overhead power distribution lines to isolate sections of the main distribution lines/

branches (spurs) of the distribution networks. The LBS shall be 20kV, 3 phase, pole mounted type suitable for outdoor use in service

conditions specified in paragraph 3 (above) of this specification.

5. MINIMUM TECHNICAL REQUIREMENTS The minimum technical requirements shall be as follows:

Operating Voltage: 20kV Max. Voltage: 24kV

Number of phases: 3 Rated frequency: 50Hz

Rated continuous current: 630A Rated breaking capacity: 630A Rated short time current (RMS): 16kA/1s

Rated fault making capacity (peak): 40kA Power frequency withstand voltage:

a) Phase to earth: 50 kV rms b) Across the terminals of open switch (of same phase): 60 kV rms

Lightning Impulse withstand voltage (1.2/50µs) wet & dry

a) Phase to earth: 125kVp b) Across the terminals of open switch (of same phase): 145kVp

“class E3 general purpose switch” (having the capability of frequent switching of higher currents and a higher frequency of making on short-circuits) according to IEC 62271-103.

“class M2 general purpose switch” (for special service applications and for frequent operation having an extended mechanical endurance of 5000 operations)

according to IEC 62271-103.

6. BASIC FEATURES 6.1. Design

The LBS shall be a compact, lightweight, maintenance free type that can be easily installed on a frame/platform on a vertical pole approximately 2600 to 3300mm

diameter section of 20kV or 15 kV lines. The frame/platform shall be suitable for single pole mounting and steel gantry structure mounting. The LBS shall be complete

with operating mechanism and other components necessary for operation, including mounting hardware for LBS main body and control panel (mounting frame/platform, adjustable support brackets, clamp type terminal plates, cross arms, bolts, nuts and

washers), cables with suitable plugs connecting the main body of the LBS to the control panel as well as the supply power transformer to the control panel. . The

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mechanical design and strength of the unit and all components shall be able to bear the mechanical forces on the switch terminals when installed and during operation.

They shall withstand the electro-dynamic forces without any reduction in reliability and/or current carrying capacity of the switches.

All non-metallic parts including insulating materials of cables shall be able to withstand effects due to ultra violet radiation. Where SF6 is used for insulation and interruption, static filters for absorbing moisture

and arc products shall be mounted inside the SF6 filled chambers.

6.2. Operating Mechanism

The LBS shall operate either locally via an insulating hook-stick or its control panel or remotely by a remote Control Center.

The switch operating mechanism shall be a rapid open and close operation and independent of the operator. Any manual, hook-stick operation will declutch the actuator motor within the mechanism compartment for unhindered operation.

The minimum distance between the live parts of the LBS and the ground will be 5m

and the maximum distance will be 9 m. HEDNO will specify upon drawing approval the exact lengths of the required cables (mainly 8m from control panel-RTU to the LBS and 11m from control panel-RTU to supply power transformer).

LBS shall be able to control as follows:

a) The operation (ON/OFF) shall be carried out manually by means of an insulating

hook-stick. b) All three poles of the LBS shall be operated simultaneously by the operating

mechanism. Sufficient insulation between the live parts and the operating

handle shall be provided for the safety of the operator. c) Before the switch is operated via the hook-stick, a lock handle shall be operated

(again via the hook-stick) to FREE the hook-stick mechanism. Typically, the lock handle is operated to LOCK off the switch as a Point of Isolation when in the OFF state. Conversely, the switch is closed (ON) by FREEING the lock

handle and operating the hook-stick mechanism. Manual operations therefore require a two stage procedure to reduce operator error. When the lock handle

is operated to the LOCK off position, then this action inhibits both local and remote operations of the built-in actuator motor. The status of the lock handle shall also be available as a volt free contact for SCADA monitoring.

An operations counter shall be provided to positively indicate the number of

operations of the LBS. The operations counter shall be clearly visible from the ground even under bad weather conditions.

The source side and the load side of the LBS shall be interchangeable.

6.3. Provision for Remote Control

The SF6 or vacuum LBS shall be equipped with the following features to facilitate remote control and monitoring:

a) A motor actuator to perform OPEN and CLOSE operations and rated for a 24V

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actuator supply. b) Contacts that indicate the positional status of the switch directly fitted to the

operating mechanism. c) For the SF6 switch, low gas pressure contacts

d) Lock handle contacts e) Three phase set of current transformers built into the switching tank or ring

type CT installed on the bushing for current monitoring and phase/earth over-

current fault detection. f) Voltage sensors fitted to the six bushings to monitor a minimum of voltage

presence. The LBS shall comprise a Remote Terminal Unit (RTU) for Remote/Local switching

facilities to select the required operating mode. The RTU shall be compatible with HEDNO’s SCADA control and monitoring system.

6.4. Connection LBS terminals shall be made of tin plated electrolytic copper or brass with a minimum

tin coating thickness of 15 μm. They shall have 2 holes 12 mm in diameter longitudinally placed, and shall be suitable to be connected with plaque or coss type terminals. The terminals are connected with 50 to 240 mm² Cu and Al conductors.

6.5. Degree of Protection The LBS tank must have a degree of protection IP67.

6.6. Earthing

An earthing terminal shall be provided for connecting the LBS metal work and mounting frame to the local earthing electrodes / galvanized steel mounting structure. The mounting frame shall have an earthing terminal suitable for accommodating one

earthing conductor ranging from 5 mm to 15 mm in diameter.

6.7. Breaking and Disconnecting

The breaking chamber of the switch shall be a SF6 gas-filled type or vacuum.

The SF6 breaking chamber shall be a “hermetically sealed pressure system” suitable for

lifetime operation with a service life at least 30 years. The Bidder shall provide reference to prove this. The pressure inside the tank shall be according to the

requirements specified in the relevant standards. No refilling of the gas shall be required over the service life. The SF6 used shall be new in accordance with the requirements of

IEC 60376. Low gas pressure will also trigger a visual mechanical indication to the operator. In

addition, a gas pressure gauge will be fitted indicating a GREEN zone for safe operation and a RED zone to avoid further operations. All these indicators shall be clearly visible from the ground even under bad weather conditions. The led from RTU will

light to alarm “gas low” and the gas gauge can show the low gas value. In addition, a low pressure lock-out device shall operate to inhibit further operations

i.e. the SF6 LBS remains in its normal/operation state.

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The vacuum breaking chamber shall be a “hermetically sealed system” suitable for lifetime operation The service life shall be at least 30 years. The Bidder shall provide

reference to prove this. Furthermore the Bidder shall declare in the offer if the vacuum breaker is equipped or not with a blocking operation as for SF6 above in a

case of loss of the insulating media to the lowest allowable level, or an arrangement indicative of loss of breaking capability of the LBS. This statement shall be only informative and not be subjected to any evaluation.

Bidders shall state the consequences of loss of SF6 gas pressure or loss of vacuum

on: • The voltage withstand capability of an open circuit switch • The ability of the LBS to switch load current

• The ability of the LBS to switch fault current (fault making).

For all the offered types of breakers comprehensive instructions shall be provided for the actions to be taken in case of unpredictable loss of the insulation properties of the insulating media.

The disconnecting function shall be carried out when the separation of the main

contacts is certain. It will be certain when a position indicator, driven by a reliable arrangement directly connected to the movable contacts, indicates the breaking and

isolation position of the LBS. This arrangement shall ensure absolute kinematic correspondence of the indication and the movement of the break and isolation of the LBS and shall be in full conformance with the ANNEX A of IEC 62271-102 and the

paragraph 6.102.6 of IEC 62271-103. Evaluation of the operation and reliability of the arrangement shall be carried out during type tests of the present TD. The indicator

shall be such that the position of the switch shall be clearly visible from the ground even under bad weather conditions. This mechanical position indicator shall indicate ON/OFF position of the LBS.

Tenderers shall describe any techniques employed for handling enclosure overpressure that could arise from internal arcs. Particular attention shall be given to

the direction and energy (mass/velocity) of discharge products. The switchgear shall incorporate a pressure relief/rupture mechanism, which is of a non fragmenting design, and designed to vent the pressure away from the operator in the event of an

internal arc fault.

6.8. Insulators and Bushings

The insulators shall be constructed of the following alternative materials: Silicon rubber according IEC 61952 with a minimum creepage distance of 610 mm.

Solid cycloaliphatic resin, highly resistant to the environmental conditions according to IEC 62217:2005 with a minimum creepage distance of 610 mm

Wet glazed porcelain in accordance with IEC 60383-1 with a minimum creepage

distance of 670mm

Silicon rubber insulators are preferred. Coated insulators and EPDM insulators are not acceptable. Minimum clearance between the most adjacent points of MV terminals shall be not

less than 220mm irrespectively whether a successful dielectric test has been performed.

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6.9. Protection against corrosion The unit shall be weatherproof in the climate conditions defined in the paragraph 3 of

this specification. The tank of the LBS and the bolts shall be made of stainless steel according to EN 10882-2 to withstand dynamic short circuit forces and the vibration of the switch.

Except where specified to the contrary, all iron and steel parts shall be hot dip galvanized after the various processes such as sawing, shearing, drilling, punching,

filing, bending, machining etc. according HEDNO specification ΧΚ11.02 and the specific coating thickness mentioned therein.

7. CONTROL PANEL OF THE LBS

7.1. Control panel - RTU

The cabinet shall be designed for the service conditions specified, adequately ventilated and fitted with substantial door securing devices capable of being padlocked by a padlock

with a shank of 8mm with the door in the closed position. It shall be possible to disconnect the cable at the tank while the LBS is connected to the

power system, without causing damage or mal-operation. Care shall be taken that CT's are not open circuited. A robust, multi-pin weatherproof connector shall be supplied. There shall be connectors at both the tank and the control cabinet.

The supplier shall ensure that the equipment housed in the control cabinet can withstand the heating effect of direct solar radiation without causing failure and/or

mal-operation. Details shall be provided in the tender documentation. The control cabinet shall be mounted below the switchgear tank and shall be connected to the switchgear by a minimum eight meter long multi-core control cable. The multi-core

cable shall be ultra violet stabilised and adequately screened against electrostatic and electromagnetic interference, which can cause malfunctioning of the protection or control

equipment. This cable shall connect into LBS and the control cabinet by means of plug and socket arrangements. Entry of the control cable into the control cubicle shall be from the bottom.

The control panel of the load breaker can be integrated to into the RTU.

The control panel will be equipped with LCD display, appropriate control buttons and indicators (LEDs) for the operation of the unit and monitoring of the load breaker status.

It will include: A switch for LOCAL / REMOTE operation of the RTU. In LOCAL position the Central

Control System (CCS) will not have the capability to execute commands. LEDs to indicate the state of the MV switchgear (red for closed, green for open) Push-buttons for "open/close" local operation of the switchgear

LEDs to indicate the status of the RTU internal alarms, the presence of the supply voltages, the communication channel status etc., in order to assist the maintenance

personnel. Button (or other means) for "resetting" the RTU (if necessary).

Also the control panel shall accommodate the ports for the communication with a portable PC. The required software will run under Windows of the latest version.

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Ten portable computers must be provided to serve the purpose of programming the RTU and uploading and downloading information at the installation site. These portable

computers shall be of the latest technology to be approved by ΗΕDΝΟ, by prestigious manufacturer.

These portable computers shall have light and rugged case, shall be easily portable (less than 2 kgr weight) with non-reflective and extremely bright display, bright enough to be easily read under direct sunlight. They shall be equipped with a storage medium. Their

battery operating time shall be at least 8 hours (according to manufacturer specs). Their operating system must be MS Windows and the software shall be in Greek language. Their

keyboard (if any) shall have both Latin and Greek characters. All the necessary software for the parameterization of the RTU will be installed.

The control panel shall provide storage of at least 100 time-tagged events. These events will be all the alarms (internal and external) and also the switchgear operations. The user

may have access to them through the portable PC. The control panel must have the mechanism for the functions of the motor, the battery

and the battery charger.

The motor must be operated: Locally, manually by a push-button.

Remotely by closing a contact.

As it is mentioned above, a suitable switch (key) must exist for the «LOCAL/REMOTE»

operation. In the LOCAL operation REMOTE operation must not be allowed. For the open/close local command two buttons must be used. The motor drive shall be connected

to the load breaker with a rigid mechanical transmission rod. In case of power failure there is a battery supply, inside the cabinet, for its continuous

supply. Chargers for the batteries must be provided The batteries will provide energy for the operation of all units (LBS, control panel, RTU and

communication system). The batteries must be hermetically sealed and must be maintenance free. They must have life expectancy of at least 5 years at 40°C operating temperature. The batteries must have the capacity:

to supply the operation of the RTU for at least 24 hours without charging (i.e. with AC supply OFF).

to perform at least 6 cycles of operations (open/close) on the LBS during the above time interval.

The bidder will include in the offer the proof of its compliance with these requirements (according to the battery manufacturer specifications).

The status of the batteries will be monitored and tested automatically. Automatic battery cut-off circuit will be provided in the RTU. It will operate when the DC voltage drops below the safety limit (deep discharge), which may damage the batteries.

Appropriate alarm must be generated and transmitted (several seconds before the cut-off) to the SCADA CCS.

The battery system shall incorporate a battery test facility. An inbuilt instrument / instruments which can by remotely or locally commanded shall indicate the health of the

batteries.

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A 2A HRC fuse or a circuit breaker shall be provided in the secondary terminal box of the supply VT to facilitate the isolation of the secondary wiring in the event of a fault.

7.2. Functions and capabilities of the RTU – control cabinet The RTU will transmit to the CCS the following data:

a. The change of the state of the load breaker (open-close)

b. The status of the RTU control (Local/Remote) c. The status of Lock Handle (on/off) d. Signals of paragraph 8. The following alarms

1. 100 V AC loss of supply 2. Internal alarms of the RTU (watchdog)

3. Six (6) spare alarms (for example door open), activated by closing dry contacts

4. Loss of supply for low level of batteries

5. Low gas pressure (for SF6 LBS) 6. Phase Sync. Check (to prevent closing LBS)

e. The following measurements: (real values after communication RTU-CCS is established)

1. Current (Α) of each phase

2. Voltage (kV) of each phase on both sides of the LBS

The RTU will receive from the CCS the following data: a. Commands for the changing of state of the load breaker (opening-closing).

The operation commands will be given either locally or remotely from the CCS.

b. Time synchronization messages from the communication protocol

7.3. Degree of Protection The degree of protection of the cabinet must be IP43. The lid of the cabinet shall be

equipped with one piece rubber replaceable seal with no joints and gaps. The cabinet must be constructed from stainless steel and all the accessories must be rust-proof, or

must be protected with suitable anticorrosion paint and be internally thermally insulated. The construction must follow the requirements specified with the IEC 60870-2-1 standard.

Also the cabinet of the control unit-RTU must have: Ventilation for cooling

Heating resistance (heavy duty type) driven by a thermostat Provision for antenna installation in such a way that only the top part of the

antenna to extrude from the casing, providing theft protection. This shall be in a

way that will maintain the IP rating of the enclosure.

7.4. Protection and safety

The control cabinet shall have proper terminal for grounding all metal parts. It shall be fitted with an external M12 earthing stud, with a nut, lock nut, and a serrated washer.

Provision shall be made to ensure the electrical continuity of all exposed metal. Earthing

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terminals shall be fitted to all such equipment. An earthing strap shall be provided between the lid and the tank of the cabinet.

The control cable shall be adequately earthed to shield the control equipment against electrical interference.

The cabinet should be suitably shielded so that the mounted GSM / GPRS antenna should not interfere with the normal operation of the equipment. Where minimum distance requirements for the mounting of an antenna apply, these should be stated.

The control panel must comprise an adequate number of digital and analog inputs/outputs. Α galvanic isolation of the input/output cards must exist. The voltage isolation will be 2,5kV

(rms). Current monitoring circuitry in the most important parts of the RTU will be employed, in order to cut-off the supply in case the current exceeds the safety limits (i.e. presence of a short-

circuit). Also the control outputs will be protected against short-circuit, using proper fuses. Detailed information about these features will be included in the offer and in the RTU's

documentation. The Electronic circuits of the control parts shall have protection against overvoltage, spikes and transients. The control panel shall be equipped with a reliable lightning equipment

certified by an in depended Accreditation Body (e.g. KEMA, VDE e.tc). The equipment shall be of class II-2 at least with 10 kA nominal discharge current, according to IEC-61643-

11:2012. All additional means required for protection of the RTU and the rest control circuits and parts of the control cabinet against overvoltages and overcurrents shall be

studied and implemented by the Bidder.

8. Fault Detection Fault detection capability is required for the RTU, i.e. when the phase or earth-fault

current exceeds a preselected limit, a signal will be send to appropriate RTU board for elaboration and transmission of the event to the SCADA CCS.

These limits (or settings) for this function will be: a. Adjustable, from 10 Α up to 1000 Α, with step of 10 Α (Precision until 5%) for the

phase current. b. Adjustable, from 5 Α up to 800 Α, with step of 1 Α (Precision until 5%) for the earth

fault.

c. The time interval, for which the phase or earth fault must be sustained in order to be registered by the fault detecting circuitry. The time interval shall be adjustable

from 0,05 to 10 sec, with step of 0,01 sec (Precision until 5%) The selection of the parameters will be done through the control panel parameter

configuration procedure, and will be downloaded to the RTU.

The control cabinet shall be equipped with Inrush restraint, Cold load and Open line detection (loss of phase) functions. Limits will be:

a. Cold load: Multiplier adjustable from 1 to 5, with step 0,1 and Time adjustable from

1 to 60 min, with step 1 min b. Inrush restraint: Percentage of 2nd harmonic from 5 to 50% of the fundamental

frequency, with step 1% and Detect time 0,02 to 1 sec, with step 0,01 sec. c. Open Line detection: Volt ON from 50 to 90% of nominal voltage, with step 5% and

Volt OFF from 50 to 90% of nominal voltage, with step 5%

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The RTU indicates ”fault” when the line voltage is dropped below the voltage OFF-level of the Open Line Detection function after:

a. the measured phase current or earth current is higher than the pickup set value and maintains longer than the corresponding detection time and

b. certified that the measured phase or earth overcurrent isn’t an inrush or a cold load type overcurrent.

The RTU shall be equipped with SEF function. Limits will be: a. Pick-up current adjustable from 1 to 20, with step 1 A

b. Detect time adjustable from 1 to 30 sec, with step 0,1 sec. If this function is ON a signal shall be transmitted to the CCS in case of SEFs.

Furthermore the LBS shall be able to be used as a sectionalizer in conjunction with an

upstream Automatic Circuit Recloser (ACR). When the LBS’s RTU indicates “fault” according to the above mentioned procedure, the sectionalizer shall count one ACR operation (trip). Subsequent ACR operations

shall be counted by the sectionalizer and when a predetermined count is reached the sectionalizer shall isolate the faulty circuit while the ACR is in the open position. The

ACR can then restore power to the healthy part of the system. If the fault is of temporary nature and is cleared before the sectionalizer count

reaches the predetermined number, the sectionalizer shall remain closed and shall reset to its pre-fault condition after the reset time is expired.

The number of predetermined counts for LBS tripping shall be 1, 2 or 3 and the reset

time shall be 20 up to 240 seconds. The sectionalizing function shall be set ON or OFF.

These settings shall be adjustable at the field from the LBS’s control panel.

The standard operating cycle of an upstream ACR is: - Instantaneous opening, Instantaneous reclosing. - Time delayed opening, 5 second reclosing

- Time delayed opening, 5 or 10 second reclosing. - Time delayed opening.

The time delay of the delayed opening may reach up to 7 seconds.

There shall be at least 4 different setting groups regarding the above mentioned functions and their different setting values can be stored individually. The user may select one of these 4 setting groups as active group, whose setting values will be applied.

9. THREE CURRENT TRANSFORMERS (3 SINGLE PHASE)

The current transformers of paragraph 6.3.e. must have the following characteristics: IEC standard 61869 -2

Rated voltage: 24kV Rated secondary current: 1A

Ratio 1000/1A Accuracy: 3%

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10. ONE VOLTAGE TRANSFORMER (DOUBLE PHASE) FOR

POWER SUPPLY

The voltage transformer must have the following characteristics:

Rated primary voltage: 24kV

Dry type cast resin are acceptable with resin insulation IEC standard 60044-2, 61869 -3

Double ration 20-15/0,1 kV ac Rated output: enough for all the units operation Accuracy 5%

Applied voltage 50 kV r,s/1 min Impulse voltage: 1,2/50 μs, 125kV, peak value

11. SIX ELECTRONIC VOLTAGE SENSORS (CAPACITIVE)

Line voltage shall be monitored on all six LBS bushings to allow remote monitoring of voltage presence from either direction. The electronic voltage transformers of paragraph

6.3.f. shall have the following characteristics:

IEC 60044-7 standard

20kV or 15 kV nominal voltage Integrated voltage sensors to provide resistive voltage measurement

Accuracy 0.5% over the operating temperature range. Protection against electromagnetic noise Factory pre-calibrated

12. COMMUNICATION CAPABILITIES

12.1. Means of Communication The equipment (Control Panel / RTU) will communicate with the Central Control System

(CCS) of a SCADA via GPRS using the IEC 60870-5-104 protocol. HEDNO will provide the required SIM cards with a private APN network range.

12.2 Communication with existing central control systems HEDNO has in operation two types of CCS, the Telegyr TG8000, that uses the IEC 101

protocol and the EFACEC SCATEX+, that uses the IEC 104 protocol. By the time of the installation of the first LBS, the Telegyr TG8000 system will be replaced with a SIEMENS Spectrum TS CCS, that will use the IEC 104 protocol for communication with the LBS.

The contractor will have to implement the communication to the SCADA systems,

mentioned above, based on the interoperability and address tables attached in the Call of Tender.

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A protocol converter (gateway) could be used, in the case of communicating with the Telegyr TG8000 CCS, for conversion of the protocol of the offered RTU to the IEC 101

(attached figure 1).

The SCADA system will interrogate the each LBS in a predefined time interval and acquire the information described in par. 7.2. This time interval is user selectable per LBS form the SCADA system. The LBS will have to respond to these requests, but also transmit

events or alarms as they are generated. The Bidders shall provide a calculated value of MBytes per month based on an hourly interval of interrogation. The spontaneous

broadcast of events and alarms will not be part of these calculations.

13. PROTOCOL CONVERTER (Gateway)

The protocol converter (Gateway) must respect the following requirements:

1. Conversion of the RTU protocol to IEC 60870-5-101 2. Each protocol converter (Gateway) shall be able to communicate with and

manage the data from at least 30 RTUs 3. The protocol converter (Gateway) shall be configurable with PC based

software. The software package will be provided by the supplier. The

configuration will be saved in the PC as a portable file and can be downloaded and uploaded from Gateway by the user.

4. The protocol converter (Gateway) must support at least the following functions.

a. Communication frame monitoring for master and slave protocol.

b. Modem operation status monitoring. c. Internal database monitoring.

d. Internal database event display. e. Internal database setting.

14. GSM/GPRS Routers

The LBS will be equipped with a GSM/GPRS router and every SCADA CCS will be equipped with the corresponding number of GSM/GPRS routers as well, in order to communicate with the LBSs.

14.1. General Features

The routers shall be equipped as a minimum with the following characteristics :

- Bands: GSM/GPRS/EDGE: 900/1800 MHz - Minimum output power: Class 4 (2W) for 900MHz, Class 1 (1W) for 1800MHz

- GPRS class 12: DL: max. 85.6 kbps, UL: max. 85.6 kbps - CSD data transmission 14.4 kbps, V.110

- Profile-managed packet data connections - Roaming algorithm for flawless network connection around the world. - In case of

GPRS communication fault from one carrier, the modems shall support automatic

roaming functions between other carriers of the same country, given that the SIM cards provided by HEDNO support this function

- NAT disable for framed route configuration

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- Transparent bridge mode using PPPoE to allow the router to transparently forward public WAN IP address to a downstream device

- SIM security management (PIN configuration, enable and disable) - Automatic and manual cellular band selection, and operator selection

- Static routing, RIP (v1/v2), port forwarding, DMZ - VRRP for redundant router failover - VPN functions that will include :

o PPTP client for VPN connectivity to remote PPTP VPN server o IPSec tunnel termination (for up to 5 tunnels)

o GRE tunnelling o Open VPN (client, server and P2P)

- Power supply: From 12V DC up to 24V DC, with protection from overvoltages and

reverse polarity. - LED operation indications, for power status display, for connection status, connected

network type, and connection errors - Upgrade firmware locally via LAN or remotely over the air (HTTP/HTTPS, SNMP, TR-

069)

- Web-based user interface (HTTP/HTTPS) for full device status and configuration - Telnet command line interface for status monitoring, configuration and control

- SMS client (send/receive) including inbox, outbox - Ping monitor watchdog (reset connection on repeated ping failure)

- NTP server support for device system clock network time sync - Advanced diagnostics and control via SMS that will include :

o Query status information such as signal strength, WAN IP, uptime and more

o Execute commands via SMS – such as reboot, reset to defaults, go offline, and many more

o Secure SMS management using sender whitelisting and password management

o SMS acknowledgement replies for queries and commands

- Support for mini USIM/SIM format (2FF) - Reset button

- 1x SMA connector for optional external main antenna - Operating conditions:

o Temperature: -15o C - +60o C

o Humidity: up to 92% RH

14.2 Standards–Specifications–Instructions

According to the ETS 300-342-1 According to Directive 89/336/EEC, on electromagnetic compatibility

According to Directive 98/13/EEC, on telecommunication terminal equipment

14.3. Antenna

Omni-directional SMA plug Gain >4dBi

Dual Band (900/1800 MHz) Connected with at least 2m cable

Optional magnetic base or mounting bracket

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14.4. Installation

In the offer shall be included the necessary connectors, cables, etc. for the mounting of

the device in the RTU cabinet and the corresponding antenna too. For theft or vandalism protection for the antenna, a provision shall be made to be placed inside the RTU, with only the top part of it extruding from the RTU cabinet. Only the base of the antenna will

be inside the cabinet body in order to minimize any interferences to the electronic parts of the control panel.

14.5. Special Terms The supplier must provide the technical manuals of the devices and antennas and the

installation and user’s instructions. Operation and troubleshooting manuals shall be provided in Greek language. All other manual (Engineering, User, Programming etc.) could be only on English language.

The technical solution will include the telecommunication equipment (modem/router).

It is the bidder’s responsibility to provide a technical solution, for the reliable and uninterrupted communication, in cases where there is no GSM/GPRS signal available. The Proposed solutions might include (per location of the LBSs) higher gain antennas or

alternative means of communications requiring or not line of sight (Radio modems, wi-max etc.). These solutions, up to a number of 2% of the total installations will have no

additional cost for HEDNO. More locations, will not be covered by the scope of the tender.

15. TESTS

15.1 Type tests

Type tests shall be carried out at the beginning of the execution of a contract, prior to the delivery of the first lot (and prior to lot acceptance tests), and it is possible to be repeated at the absolute discretion of HEDNO, whenever during the realization of the

contract.

The performance of the tests at the beginning of a contract shall be requested by HENDO within 15 days from the effective date of the contract and take place:

a) HEDNO has not yet procured the specific type of product in the past,

b) Wherever the performance of the type tests is requested by the technical evaluation, or the assigned inspector of PPC. In the last case a written

justification is required. For example tests repetition may be requested whenever test certificates provided have not been issued by an acceptable by HEDNO laboratory, or the tests are found to be inappropriate, or if the product

has been modified regarding to the approved one.

At the discretion of HEDNO, existing test certificates issued by a nationally or internationally recognized laboratories, EN 17025 accredited, is possible to be acceptable. Anyway HEDNO keeps the right to check all or part of the existing test

reports by performing the appropriate tests.

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Type tests will be performed before mass production. It is clarified that the time required for construction of test specimen, type testing, issue of the relevant test reports and tests

evaluation will extracted from the delivery schedule, i.e. the delivery time will be extended equally to the time required for the testing. The supplier will prepare 8 specimen of which

HEDNO will randomly select a suitable number of test specimen upon which to perform the full type testing.

15.1.1. Type tests for RTU

Insulation breakdown voltage, comply with IEC 60255-5

(a) Supply voltage Class VW3, IEC 60870-2.1 (2.5 kV/50Hz/1 min).

(b) Digital inputs Class 3, IEC 60870-3, table 6 (2,5 kV/50 Hz/1 min)

(c) Analogue inputs

Class 2, IEC 60870-3, table 7 (0,5 kV/DC/1 min)

DC impulse voltage withstand, comply with IEC60255-5

(a) Supply voltage Class VW3, IEC 60870-2-1 (5 kV/50 μs/50 Hz) and

Class III, IEC 255-4 (5 kV single HV impulse) (b) Digital inputs

Class 3, IEC 60870-3, (table 6) and

Class III, IEC 255-4 (5 kV single HV impulse) (c) Analogue inputs

Class 2, IEC 60870-3, (table 7) and Class II, IEC 255-4 (2 kV single HV impulse)

Temperature test, comply with IEC60068-2-48

A test must be carried out to check whether the operation of printed circuit boards is in accordance with IEC standard 60870-2-1 standard, class B4 for 48 hours.

15.1.2. Type tests for Load Breaker and supply voltage transformer

The total number of the items to undergo all the specified type tests shall not exceed four (4) and the type tests to be performed are the following:

1. Dielectric tests in accordance with the paragraph 6.2 of IEC 62271-1.

2. Measurement of the resistance of the main circuit in accordance with the paragraph 6.4 of IEC 62271-1.

3. Temperature rise test in accordance with the paragraph 6.5 of IEC 62271-1.

4. Short time withstand current and peak withstand current 16 kA, 1s, 40 kA peak current in accordance with the paragraph 6.6 of IEC 62271-1.

5. Test for class of protection in accordance with the paragraph 6.7 of IEC 62271-1 and the IEC 60529.

6. Mechanical operation tests for M2 class LB, in accordance with the paragraph

6.102.2.1 of IEC 62271-103.

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7. Making and braking tests in accordance with the paragraph 6.101 of IEC 62271-103. All breaking tests shall be carried out on a single breaker and all making tests

on another piece. 8. Operating duty tests in accordance with the paragraph 6.11. of ANSI C37.63:2005.

9. Tightness test for SF6, insulated breakers after the mechanical operation test above, in accordance with the paragraph 6.8 of IEC 62271-1 and the test duty Q of IEC 60068-2-17.

10.Electromagnetic compatibility tests in accordance with the paragraph 6.9 of IEC 62271-1.

11.Low and high temperature withstand tests in accordance with the paragraph 6.102.3 of IEC 62271-1.

12.Operation test for position indicator of the LB in accordance with the paragraph

6.102.6 of IEC 62271-1 and the ANNEX a of IEC 62271-102. 13.X-ray emission test for vacuum LB’s in accordance with the paragraph 6.11 of IEC

62271-1. 14.Type tests for the supply voltage transformer in accordance with IEC 61869-3

15.2 Routine tests Routine tests shall be carried out at manufacturer’s premises and the relevant test protocols shall be provided to the assigned inspector. The routine tests are the

following:

1. Dry, short duration power-frequency withstand voltage applied on the main circuit. Test voltage 50 kV rms, 1 min between the phases and the earth and 60

kV rms, 1 min across the isolating distance, in accordance with the paragraph 7.1 of IEC 62271-1.

2. Measurement of the resistance of the main circuit in accordance with the

paragraph 7.3 of IEC 62271-1. The value of the resistance measured shall not exceed 120% of the relevant value measured during the type tests.

3. Tightness test for SF6 insulated LB’s in accordance with the paragraph 7.4 of IEC 62271-1.

4. Design and visual checks in accordance with the requirements of the present TD.

5. Mechanical operation test in accordance with the paragraph 7.101 of IEC 62271-103. More specifically 10 complete open-close cycles shall be performed on the

LBS. No adjustments are permitted during the test and the position indicator shall show the right position in any case, and after completion of the tests no failures shall be found.

6. Insulation breakdown voltage test (2,5kV/50μs/50Hz), on control panel. 7. Operational calibration test in accordance with the paragraph 7.1 of ANSI

C37.63:2005. 8. Routine tests for the supply voltage transformer in accordance with IEC 61869-3.

15.3 Sample tests (Factory Acceptance Tests - FAT) These tests shall be performed in presence of HEDNO’s personnel at the manufacturer’s premises, prior to delivery, after successful routine testing performed on each specimen of

the batch done by the supplier. The assigned HEDNO’s inspector shall select a random sample from any lot under

delivery based on IEC 410 plans, simple or double sampling, normal inspection,

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inspection level II, AQL=2,5%, on which all the tests described in the paragraph 15.2 above shall be successfully carried out.

Also a full operation check must be carried out to ensure that the system operates according to the present specifications. Operational checking must be done using simulation

techniques at the premises of the supplier. The supplier has to propose the procedure and duration of such tests. HEDNO has the right

to modify these procedures, up to 30 days prior to the inspection period.

16. SPARE PARTS

The bidders must attach a complete list of spare parts. The spare parts list must include all the items of the load breaker and the RTU (cards of RTU, modules, interconnecting flat cables etc.) with their unit prices.

The bidder will provide the spare parts mentioned at the Call of each Tender. The price of the spare parts must be included only in the economical evaluation.

In the bid there must be a three year guarantee for all units from the dispatch time. There will be at least 10 years availability period of all spare parts.

All acquired spare parts will be tested during the Guarantee period. The test will be done by installing them in the commissioned units, replacing those which are already functioning. Any

spare part found faulty at the first test will have to be replaced by the supplier free of charge.

17. SPECIAL INFORMATION THAT MUST BE GIVEN WITH THE

BID - REFERENCES

Every bid must be followed with the underneath information–in other case the offer will

be rejected:

Typical drawings, leaflets, etc, that show characteristics of the offered units,

their dimensions and proposed installation layouts with instructions. Maintenance instructions.

Certificates to ensure that the units comply with the IEC standards mentioned in this technical description

A declaration of conformity of the material offered with the requirements of the present TD

Type test certificates and reports from international Laboratories according

to the paragraph 15.1 of the present technical description regarding LBS. It is explicitly stated that Performance test certificates shall not be accepted.

The bidder must fulfill, with rejection of the offer, the following:

a. The bidder must complete a detailed compliance table with the technical description per paragraph.

b. Must have ISO 9001. c. The bidder must have references from Utilities (name of the Utility, address,

phone number, fax number, e-mail etc), for the same or similar units

(voltage, rated current, short circuit current equal or higher than 20kV,

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630A, 16kA respectively). In the reference letters, the buyer, the type of LBS, the quantity, the date of delivery and the country of installation shall

be mentioned, as well as, whatever information is deemed to be useful for proving the long term successful operation of the material. The units must

be installed in the last 5 years and operate satisfactory. The number of the units must be at least equal to the number of the tender. As proof original or true copies of Appreciation letters are preferred but copies of sales

contract are also accepted. d. Must provide a detailed description on methodology to implement

communication between the offered RTU on the field with two concurrent SCADA systems (Efacec and Siemens).

e. Declaration of the factory where the product is manufactured, with analytical

information (Full address, number of employees, a brief description of the installations, testing capabilities). The factory shall possess the following

certifications and capabilities and provide the relevant certificates: o ISO 9001:2008 certification of the manufacturer, with a certification

scope including the LBS’s. The certificate shall be guaranteed by the

manufacturer, which shall also provide communication data for the Certification Body together with its accreditation certificate, or any

other data requested during the technical evaluation of the offer, facilitating the examination of the soundness of the certificate.

o Adequacy of the testing equipment for routine and lot acceptance testing.

o A declaration of the manufacturer of the insulations offered and the

relevant data regarding quality certification, if requested. HEDNO reserves the right to examine on site the production and the rest

capabilities of the manufacturer of the LBS. f. For the type of insulators offered References (sales list, reference letters

homologations) from Utilities (name, address, phone number, fax number, e-

mail, etc.), proving that the manufacturer is in uninterrupted operation and produced at least 6.000 pieces of the identical type as that offered, and that

these insulators are operating successfully in the network, during the last 5 years, as minimum.

18. DOCUMENTATION

The supplier must provide, for approval by HEDNO within 30 days from the effective date of the contract, three complete sets of the documentation for all units, in hardcopy and in electronic form.

The documentation must include: Description of all offered units

Description of the operation of all units The drawing of the electronic parts of the units which will describe in every

detail the internal wiring of the RTU cabinet with its terminal blocks and

connectors Block diagrams of the various HW modules of the RTU showing the way

they are interconnected and the connections between RTU – LBS Maintenance

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19. TRAINING The supplier will provide free of charge for HEDNO eight sessions of training, each

one lasting three (3) days at different geographical sites in Greece and at different time intervals.

HEDNO and the supplier will agree on the most convenient time for the courses, but that period must be within two months from the delivery time. One RTU and all the necessary equipment (portable computer, protocol converter

(Gateway) etc) and documentation will be used for this training.

The training shall include, at least, the following: The RTU HW components piece by piece

The RTU's SW main functions The function of the RTU as a unit Description of the communication software

Maintenance of the unit Operation of the LBS

The function and maintenance of the protocol converter

20. GUARANTEE

The guarantee period will be three (3) years for all units supplied. The guarantee period

will start from the date of installation and shall not exceed five (5) years from the date of delivery. HEDNO will provide upon request of the Supplier proof of the date of installation of the LBSs.

The supplier must be fully responsible for the proper operation of all the units for the

guaranteed period. During the guarantee time period the supplier, free of charge will: • Intervene to correct any RTU SW fault which will be found. The same is also

valid for the protocol converter SW.

• Correct any communication problems that may arise (due to the equipment supplied).

• Correct any error or omission which will be found in the documentation. • Respond to any information required by HEDNO. • Make any modification requested, which will improve the RTU's compliance

to the specifications.

All costs resulting to HEDNO from replacing any faulty equipment (LBS and RTU) both of removing and reinstalling within the guarantee period will be held from the letter of Guarantee. The Supplier will have to replace within 2 months the parts used, from the

HEDNO’s Lot of Spare Parts, with the repaired or new part. For every month of delay to replace in time, the part used from HEDNO’s Lot, the price of the item will be held

from the letter of guarantee. In case a spare part is not available in HEDNOs warehouses the supplier has to provide it to HEDNO within 15 working days.

Regarding the interventions to correct any RTU and protocol converter SW fault the following will apply:

• Maximum time for answering to HEDNO (notice of a problem) to the telephone, FAX or e-mail : 2 h, from 8 a.m. to 3 p.m. from Monday to Friday,

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except official holidays, as they apply to Greece.

• Maximum time between acknowledging the problem reported above by

HEDNO until the on-site intervention : 15 working days (in case the intervention has to be supplied to all locations shall be concluded within 3

months). • Maximum time between on-site intervention and resolution of the problem

(return to repair conditions): 2 working days.

Failure to provide support within the above mentioned times, will incur a fine of

250,00€ per day of delay. For intermediate delays (e.g. hour, day section) the fine will be determined by linear interpolation. In case of simultaneous events the Supplier shall proceed to interventions and

corrective actions in a sequentially manner. The Supplier won't be responsible for any delays regarding compliance with the

maximum times mentioned above, if those delays result from force majeure cases. The Supplier shall notify HEDNO, by registered letter, in the advent of any situations mentioned in the previous clause immediately or in any case within 15 days from the

occurrence date, if all other means were tried to avoid or minimize the delay in the promised obligations.

The Supplier has the sole responsibility of employing its personnel according to all

the legal requirements and providing all personal and health insurance for him. HEDNO could not be held liable for any injuries or compensation to the personnel of the Supplier.

At the end of the guarantee period, HEDNO and the supplier will sign a protocol on the

equipment's behavior for the release of the Letter of Guarantee.

21. NAMEPLATES AND MARKING LBS’s shall carry a nameplate, suitable to withstand the environmental conditions, at a position visible at normal operation position, with engraved letters including at least

the following data: Name or trademark of the manufacturer

Date of manufacture, type and serial number Contract number Class of the LB according ΕΝ 62271-103 (E3, M2)

Rated voltage Rated current

Rated short time withstand current Rated short circuit making current (rms and peak value) Rated impulse withstand current 1,2/50 μs (BIL) between phases and

the earth and across the isolating distance.

A name plate shall be provided on the auxiliary power supply VT with the following information:

• Manufacturer's name

• Serial number and date of manufacture • Rated impulse withstand level

• Primary and secondary voltages

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• Rated current

22. PACKING

The LBS shall be packed in durable wooden cases of suitable dimensions, with all sides totally closed. The cases shall withstand external environmental conditions, like rain, humidity, ambient temperatures etc.

The packing shall ensure that the LBS shall be protected against damages during transportation, loading and unloading. The wooden cases shall be packed together on

EU type pallets and the total weight of pallet one shall not exceed 550 Kg. On two opposite sides of each case the following data shall be marked in a clear and

indelible way: Manufacturer / Year of manufacture / Contract Number

Type and serial number of the LBS HEDNO material code number

Gross weight in kg

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Figure 1

GATEWAY

CCS SIEMENS

SPECTRUM TS

LBS #1

LBS #3000

CCSTELEGYR TG8000

CCS EFACEC

SCATEX +

IEC 104

IEC 104

IEC 104

IEC 101

After SCADA

Transition