esolar-1662 electrical acceptance testing r0

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Specification No. ES-1662

SPECIFICATION REVISION PAGE

REV. NO. SIGNATURE AND TITLE DATEPAGES AFFECTED

REVISION NOTATIONS

Manager, Design Engineering

Construction Services

Manager, Engineering


Manager, Quality






Manager, Quality






Manager, Quality






Manager, Quality






Manager, Quality






Manager, Quality


ES-1662 i

CE203-1, REV.0 03/18/92


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Specification Number: ES-1662

Revision Number: 0

ES-1662

TABLE OF CONTENTS

Paragraph Page

1.0 Scope 1

2.0 References 1

3.0 General Requirements 1

4.0 Testing Requirements 3

5.0 Commissioning Requirements 5


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ELECTRICAL ACCEPTANCE TESTING

1.0 SCOPE

This Specification covers the general requirements for field testing and commissioningof electrical facilities.

2.0 REFERENCES

The applicable provisions of the following publications are considered part of thisSpecification.

ANSI (American National Standards Institute):

ANSI/IEEE C57.106 Guide for Acceptance and Maintenance of Insulating Oil inEquipment (latest issue).

ANSI/IEEE Std. 43 Recommended Practice for Testing Insulation Resistance ofRotating Machinery (latest issue).

API (American Petroleum Institute):

RP 14F Recommended Practices for Design and Installation ofElectrical Systems for Offshore Production Platforms,(1985).

3.0 GENERAL REQUIREMENTS

3.1 The requirements of this Specification reflects only the minimum standards andprocedures to be followed before electrical facilities are placed in service or

turned over to COMPANY as being electrically and mechanically complete. Itshall be the responsibility of the CONTRACTOR to make any additional test orcommissioning checks necessary to provide a safe, reliable and functionallysound electrical installation.

3.2 Where alternative methods are preferred by the CONTRACTOR or arerequired to proof-test specific or specially rated equipment or systems, it shallbe the responsibility of the Contractor to obtain COMPANY approval.


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3.3 Where applicable, the testing and commissioning requirements of thisSpecification shall be conducted in accordance with the manufacturer'sinstructions or under the supervision of a manufacturer's representative whenequipment warranties would otherwise be voided.

3.4 Details of the procedures for testing and commissioning, including applicabletables and forms for recording results, shall be developed by theCONTRACTOR and submitted to COMPANY for approval.

3.5 All test equipment shall be provided by the CONTRACTOR and be subject toapproval by COMPANY for accuracy, calibration and suitability for the intended

function. Equipment should be operated only by trained personnel.

3.6 Measurement instruments, used to determine the quality of product, shall becalibrated to maintain the accuracy of displayed quantities. The accuracy shallmeet the minimum requirements of the National Bureau of Standards.

Calibration certification documents shall be maintained by the vendor. Thesedocuments shall be made available to the purchaser upon request.

3.7 COMPANY reserves the right to witness all tests and commissioning functionsand shall be notified in advance. The timing of the advance notice shall be

mutually agreed to by the appropriate field personnel of both COMPANY andthe CONTRACTOR.

3.8 Prior to high-voltage testing, the CONTRACTOR shall take necessary safetyprecautions, such as issuing notices of intended testing and posting safetysigns and barriers.

3.9 Records of the results for each test and commissioning function shall besubmitted to COMPANY on a weekly basis unless otherwise mutually agreedby the appropriate field personnel of both COMPANY and theCONTRACTOR.

Normally, the results of repetitive-type tests or commissioning functions, suchas megohmmeter testing of motors or of motor feeding and control cables,may be grouped on a single record form.

As a minimum, the records shall contain the following information:


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a. Description of the test or commissioning function, date performed andidentification of the test equipment used.

b. Applicable ratings, equipment numbers and location of thefacilities.

c. Size, length and rating of cables; whether cables are shielded orunshielded; and manufacturer's test values for medium-voltagecables.

d. Ambient temperature and humidity where applicable to theparticular test or commissioning functions.

e. Minimum test values acceptable in compliance with Projectspecifications.

f. Test results including comments where necessary for clarification.

g. Details of any corrective actions taken.

h. Results after correction actions have been taken.

i. Signature of the contractor's representative.

3.10 Where facilities fail to meet acceptable standards or the intended functionsduring testing and commissioning, COMPANY shall be immediately advised.

3.11 Where applicable, cables shall be visually inspected on the reels whenreceived at the platform or terminal. Where damage to metal-clad,metal-sheathed or shielded cables is suspected or indicated, preliminaryinsulation tests shall be performed in accordance with the requirements of thisSpecification to determine that the cables are satisfactory and that theinsulation values are not less than those recommended by the manufacturer.For nonmetallic sheathed and unshielded cables, special testing arrangementsmay be necessary to proof-test cable insulation.

3.12 The insulation resistance of rotating equipment and transformers shall betested in accordance with the requirements of this Specification on receipt atthe job site. The results shall be recorded and forwarded to COMPANY.These initial test results shall be compared with the results obtained at thetime of commissioning to determine if major insulation degradation has takenplace.

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3.13 Periodic clean-up of indoor equipment areas, especially substation andelectrical equipment buildings, shall be performed by the CONTRACTOR

during construction. As part of the final commissioning responsibility, theCONTRACTOR shall thoroughly clean the areas, including dusting andvacuuming of equipment enclosures on both the outside and inside, to ensurethat the equipment is completely free of dust or other contaminants whichcould affect performance and reliability.

4.0 TESTING REQUIREMENTS

4.1 General

4.2.1 The ambient temperature shall be measured and recorded at thetime of all insulation tests. Special humidity measurements will notbe required unless specifically requested by COMPANY,CONTRACTOR or equipment manufacturer for a particularequipment test.

4.2.2 Megohmmeter testers, except as otherwise required in Paragraph4.2.3 of this Specification, are preferred for measuring theinsulation resistance of equipment and materials. Test voltagesshall conform to the following requirements.

a. Equipment rated 1000 V or less shall be tested at 500 Vminimum.

b. Equipment rated 4000 V through 5000 V shall be testedat 5000 V.

4.2.3 Metal-clad, metal-sheathed and shielded medium-voltage cablesshall be acceptance tested using high-voltage direct current. Otherrequirements of these test are as follows:

a. Maximum field test voltage shall be 80% of the factory

test voltage unless otherwise recommended by themanufacturer.

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b. Values of leakage current shall be measured and

recorded at fixed increments of voltage between zeroand maximum field test voltage. Generally, a minimumof 5 and a maximum of 10 voltage increments areacceptable depending upon the voltage class of thecable. Where breakdown of insulation is probablyindicated during testing, the increments of test voltageshall be reduced to enable a more accuratedetermination of the rate of rise of leakage currentversus test voltage.

c. The voltage at each test increment shall be sustained for

a minimum of 1 minute before recording the leakagecurrent. The maximum field test voltage shall besustained for at least 5 minutes with the leakage currentbeing recorded at the end of each 1-minute period.

4.3 Dielectric Tests

4.3.1 All equipment, such as transformers, circuit breakers and switches,containing insulating oil shall have the oil dielectrically tested.Refer to ANSI/IEEE STD 64 for more specific information oninsulating oil for equipment.

4.3.2 Generally, the following dielectric breakdown voltages shall applyfor the testing of insulating oil:

a. Oil for transformers - 26 kV minimum with normallyexpected values of 30 kV or more.

b. Oil for circuit breakers and switches - 24 kV minimumwith normally expected values of 26 kV or more.

4.3.3 The following procedures and equipment shall be used in testing

dielectric breakdown voltage:

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a. One breakdown voltage test shall be conducted on each

of two separate test samples. If either of the breakdownvoltages are less than the minimum acceptable, abreakdown test shall be made on each of threeadditional samples. The average of the breakdownvoltages from either the two or five tests, as applicable,shall be reported as the dielectric breakdown voltage.

b. Test voltage shall be applied and increased at the rate of3 kV/s.

c. Temperature of test sample shall not be less than 68oF

or greater than 86oF.

d. Test electrodes shall be 1 in. diameter discs spaced at0.1 in.

4.3.4 Insulating oil which breaks down under test shall be filtered byapproved means or replaced where necessary.

5.0 COMMISSIONING REQUIREMENTS

5.1 General

5.1.1 The specific commissioning requirements, including the necessaryprocedures for assuring the operability and proper functioning ofthe various systems and equipment, shall normally be developedby the CONTRACTOR subject to COMPANY approval. Theseshall include, but not be limited to, the applicable requirements ofthis Section.

5.1.2 Tests shall be performed to determine the proper functioning of alldisconnect switches, circuit breakers, motor control equipment,relays, motors, motor-operated valves, essential and main

generator facilities, uninterruptible power systems, including acomplete check of all control, interlock, alarm and sequencecircuits.

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Other checks or tests to be performed shall include:

a. Resistance measurements of grounding systems andconnections.

b. Phase orientation and marking of all applicable busesand cable systems.

c. Tagging for identification purposes all cables andconductors routed through pull and junction boxes orother multicircuit routing points. This tagging shall be inaccordance with applicable installation drawings.

d. Installation of all equipment identification nameplates,instruction plates and circuit directories.

e. Functional test of lighting and receptacle systemsincluding polarity and ground continuity checks ofreceptacle circuits.

f. Check of seal fittings to ensure each has been properlysealed with compound.

g. Check of illumination levels and area lightingrequirements.

5.1.3 All relays and control or equipment components that prove to besluggish or unpredictable in operation and could effect thereliability of the facilities shall be repaired or replaced asnecessary.

5.2 Wire and Cable

Before being connected to equipment, installed wire and cable having all

splices, potheads, stress cones and metallic insulation shielding completeshall be checked in accordance with the following requirements:

a. Test for continuity of all conductors and, where applicable,continuity of metallic insulation shielding to ground.

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b. Test of insulation resistance of low-voltage and unshielded

medium voltage wire and cable using a megohmmeter.Measurements shall be made between each phase conductor andbetween each phase conductor and ground or metallic cover, asapplicable.

c. Test of insulation resistance of medium-voltage wire and cablehaving no metallic insulation shielding or metallic covering using amegohmmeter. Measurements shall be made between eachphase and ground and between phases.

d. Test of insulation resistance of metal-clad, metal-sheathed

shielded medium-voltage wire and cable using high-voltage directcurrent in accordance with the requirements of Paragraph 4.2.3.Tests on metal-clad and metal-sheathed cable having no metallicinsulation shielding shall be made between each phase andmetallic covering and between phases. Tests on wire and cablehaving metallic insulation shielding shall be made between eachphase conductor and the metallic insulation shielding for thatconductor.

5.3 Motors

5.3.1 Insulation resistance shall be measured using a megohmmeterbefore motors are connected to their supply conductors.

5.3.2 The value of insulation resistance for low-voltage motors may bedetermined by a single measurement.

5.3.3 The representative value of insulation resistance formedium-voltage motors shall be determined by the dielectricabsorption ratio calculated from two megohmmeter readings takenduring the same test in accordance with the followingrequirements:

a. For motors rated 1000 HP and less, the representativevalue of insulation resistance shall be the ratio of the60-second reading to the 30-second reading.

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b. For motors rated over 1000 HP, the representative value

of insulation resistance shall be the ratio of the10-minute reading to the 1-minute reading (PolarizationIndex).

The minimum acceptable values are 1.25 for the 60- and 30-second ratio and 2.0 for the 10- to 1-minute ratio, provided the30-second and 1-minute readings of the respective ratios equals orexceeds the requirements of Paragraph 5.3.4.

5.3.4 Generally, the minimum acceptable value of insulation resistancein megohms shall equal the kilovolt rating of the motor plus 1

megohm corrected to 104oF in accordance with IEEE Std 43.

5.3.5 Other commissioning requirements for motors are as follows:

a. A check shall be made that bearings are properlylubricated and, where applicable, filled to the correct oillevel. If necessary, because of the presence of water orother contaminants in the lubricant, the grease or oilshall be replaced before the motor is energized.

b. Where applicable, drain plugs shall be removed and

motors checked for accumulation of water within thehousing.

c. Each motor shall be checked for correct direction ofrotation.

d. Motors shall be run unloaded with the couplingdisconnected for a period of at least 2 hours for motorsrated 1000 hp and less, and 4 hours for motors ratedover 1000 hp. During the running period, the motorsshall be checked periodically for excessive noise,

vibration or overheating of the bearing housing andmotor frame.

e. A check shall be made that space heaters are properlyinterlocked with the motor controller and energized whenthe motor is not running.

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5.4 Generators

5.4.1 The services of a qualified manufacturer's representative shall beobtained for supervising and performing the necessary tests,inspections and commissioning requirements of the generators aspart of the overall responsibility for the completeengine/turbine-generator equipment.

5.4.2 When the services of the manufacturer are not used for smallerengine-generator units, the applicable commissioningrequirements for motors, Section 5.3, shall apply.

Other precautions and commissioning requirements are as follows:

a. The manufacturer's instructions shall be followed.Unless otherwise stated, insulation tests on the exciterand main generator fields shall be limited to amegohmmeter rated 500 volts maximum. Precaution:Diodes and other solid state field devices shall bedisconnected to avoid possible damage duringmegohmmeter testing of the windings.

b. Insulation testing of the main windings of the generator

shall conform to the requirements of Section 4.2 usingthe same precaution noted in Item a.

c. Where applicable and when permanent references areprovided on the generator shaft, a visual check shall bemade following alignment to assure the generator rotoris located on the magnetic center.

d. Phase rotational tests shall be made on all multiplegenerator installations. Dependence on only theterminal identification for proper phase rotation is not

acceptable.

e. Functional tests shall be made in accordancewith the manufacturer's recommendations on allgenerator control equipment including, as applicable, therequirements of Section 5.5.

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5.5 Switchgear and Motor Control Equipment


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5.5.1 The insulation resistance of switchgear and motor control

equipment shall be tested in accordance with manufacturer'srecommendations before completing the associated wire and cableterminations. Generally, tests will consist of megohmmetermeasurements between each phase and ground and betweenphases.

5.5.2 Precautions required to obtain reliable insulation measurementswill usually include disconnecting lighting arrestors, capacitors,potential transformers and secondary ground connections oncurrent transformers.

5.5.3 On completion of the wire and cable terminations, a final insulationmeasurement using a megohmmeter shall be obtained for theentire system. Preferably, the measurement should be obtained

just prior to the equipment being energized or, where applicable,prior to being turned over to COMPANY as being mechanicallycomplete.

5.5.4 Generally, the service of a manufacturer's representative ispreferred for the purpose of inspecting switchgear andmedium-voltage motor control equipment before energization. Theinspection should include, but not be limited to, a check of the

major components, including contact wipe or alignment, arcchutes, relays and other control devices. Supervision of others inreplacing defective components or making equipment adjustmentsthat are critical to the successful operations of the equipment, shallbe part of manufacturer's service. Relays and control devices shallbe manually tripped or shorted to verify that main protectivedevices will trip.

5.5.5 Bolted bus joints, terminals and other connections for eachseparate equipment installation shall be checked for tightness on aselected basis. Based on the result of these checks, COMPANY

reserves decision on whether additional checks shall be made andhow extensive they should be. Special tools shall be used wherenecessary to conform with the manufacturer's recommendations.

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5.5.6 Protective relays shall be set and tested in accordance with the

requirements of the system coordination study. Relays having anoperating characteristic which varies with time shall be tested at aminimum of three points to verify conformance with themanufacturer's data. The integrity of the circuitry between relaysand their associated current or voltage transformers shall beverified. A sticker shall be attached to each relay verifyingcalibration completion.

5.5.7 Circuit protective devices that have adjustable settings, such asmolded-case circuit breakers, shall be set in accordance with thesystem coordination requirements. At the option of COMPANY,

these devices may require load testing on a selected basis to verifyconformance with the manufacturer's data.

5.5.8 Heater elements of thermal overload relays used for motorprotection shall be individually checked to ensure the properelement has been selected, installed and set for the motornameplate full-load current. Where fuses are used, their ampererating shall be checked for conformance with design requirements.

5.5.9 Other devices having variable timing characteristics shall be setand tested in accordance with the intended control function.

5.6 Transformers

5.6.1 Using a megohmmeter, the insulation resistance of transformerwindings shall be measured between the following points:

a. Primary winding to ground.b. Secondary winding to ground.c. Primary to secondary windings.

5.6.2 Oil-immersed transformers shall be visually inspected for leakage

at fittings, bushings and other externally connected or gasketeddevices, such as oil temperature and level gages.

5.6.3 Control and protective equipment on transformers, such asshutdown and alarm devices, fault-pressure relays and forced-aircooling facilities, shall be checked for proper operation.

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5.6.4 Tap changers shall be manually operated and set at the proper tap


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setting in accordance with the load-flow or voltage profile studies.

5.6.5 Where liquid-immersed transformers have been shipped by themanufacturer completely assembled, filled and factory tested,tanks shall not be opened for internal inspections unless specificconditions indicate otherwise. When tanks must be opened, everyprecaution shall be taken to prevent the entrance of water or othercontaminants and, where applicable, to ensure properrepressuring of the tank with dry air or inert gas as required.

5.6.6 Insulating oil of oil-immersed transformers shall be dielectricallytested in accordance with the requirements of Paragraph 4.3 withinthe two-week period prior to the transformer being energized.

5.7 Uninterruptible Power Systems

5.7.1 Preferably, an authorized manufacturer's representative shouldfield inspect and commission uninterruptible power systems.

5.7.2 In addition to routine inspection, the following minimum fieldchecks and tests shall be conducted:

a. Adjustment of the battery charger for normal float andequalizing charge rates including, as applicable, a check

of the battery electrolyte or cell voltage.b. Short-circuit test to check the performance of the inverter

in the current-limit mode and, where applicable, theoperation of the transfer switch without loss of load.

c. Transient-response tests, as applicable to that particularinstallation, including measuring and recording theresults.

d. Simulation of all alarm conditions.

5.7.3 For short-circuit and transient-response tests, equivalent test loadsmay be used when the actual loads cannot be connected for test.

5.7.4 Transient-response tests shall be made under the followingconditions:

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a. Simulation of inverter failure and operation of thetransfer switch without loss of load.

b. Retransfer of full load to the inverter without loss of load.c. Simulation of an alternating-current power failure to the


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battery charger and direct-current power from thecharger.

d. Simulation of a battery failure where facilities areprovided to ensure successful inverter operation underthis condition.

e. Energization of the single largest inductive load orcombination of loads which may be energizedsimultaneously without loss of other operating loads.

5.8 Alarms

Systems and circuits shall be individually checked by manually operating theinitiating device for each alarm condition.

5.9 Packaged Facilities

Where required or recommended by the manufacturer, special tests shall beperformed to confirm that equipment operation is in accordancewith the intended service.

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esolar-1662 electrical acceptance testing r0

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