ht panel commissioning

ADANI POWER MAHARASHTRA LIMITED

STATION: APML- Unit # -

660 MW Super-critical SHEET

PLANT AREA : ELECTRICAL HT Switchgear TESTING SCHEDULE: Procedure for commissioning of HT Switchgear

ITEM LIST OF CONTENT

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

11.0

11.111.2

11.3

12.0

Switchgear Details & technical specification

Testing objectives & proposals. Services required.

Safety.

Emergency procedures.

State of the Switchgear.

Test method

Reinstatement & preservation.

Staffing

Responsibilities & communications.

Appendices:

Safety clearance certificate. Checklist-1 pre-commissioning.& Check sheets. (Annexure-2)Annexure-3

Defect list format

1





ITEM 1 TECHNICAL SPECIFICATIONS

GENERAL REQUIREMENTSThe switchgear and its components are designed for design ambient temperature of 50ºC. Switchgear is designed for natural air cooling.

6.6KV /11 KV Switchgear1. Basic performance parametersRated voltage: 6.6kV / 11 KVRated frequency: 50 HzBus bar working ratings: As per specificationShort circuit current ratings (rms): 40KA for 1 secOne minute test voltage at power frequency: 32kV (dry test)/ Basic Insulation level: 60 KV/ 75 KV6.6kV/ 11KV systems are earthed through resistance.

2. The 6.6KV/11KV switch cabinet is indoor type, metal-clad and removable type and made of prefabricated parts. All components for functional units within the cabinet are segregated electrically.The protection class of cabinet is IP32

3. The feeders are equipped with vacuum circuit breaker, when motor capacity (or L.V. auxiliary transformer capacity) is equal to or greater than 1500kW. Otherwise the vacuum contactor F-C circuit is applied when the capacity is between 160Kw and 1500kW.

4. The main and branch bus bars of cabinet, all connections and various links, etc. are insulated.The main and branch bus bars of cabinet are capable of tolerating the maximum mechanical and thermal stresses due to short circuit of bus bar.

5. Relay compartment with necessary protection relays are provided in each switch cabinet.

6. Each switch cabinet is provided with necessary instruments and control devices such as current meter, kWh meter, and current, power transmitters except P.T. panels.Each P.T. panel is provided with necessary instruments and control devices such as voltage meter and voltage transmitter.

7. For each 6.6kV distribution section, a voltage transformer with ratio of transformation equal to 6.6kV/110V and rated capacity is 90VA of class 0.5 is provided.

8. Each switch cabinet has provisions for power and control cable

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entries from the bottom and removable plates at its top and back to allow for the connection of power cable and control cable.

9. The circuit breakers have the following characteristics: It is necessary to set up special over voltage protection inside the

panels. The vacuum testing device is provided for circuit breaker.

10. The interrupting capacity and fusing time of H.V. fuse in F-C circuit cabinet are in coordination with vacuum contactor and appropriate for load starting (motor or transformer) and overload status.Since the vacuum contactor is characterized by its low impact, no special over voltage protection at load side is provided in close-open operation.

11. The passage way for operation shall not be less than 2.3m in width when these switch cabinets are arranged in a single row and the passage way shall not be less than 3m in width when they are arranged in a double row. The passage way for maintenance at the back of these switch cabinets shall not be less than 0.8m in width and their side passage way for maintenance shall not be less than 1.0m in width. In addition, some spare space is kept for future installations of switch cabinets in each section.

TECHNICAL SPECIFICATION

Switch Board Name/Location

SR. NO.

DESCRIPTION

01 Make02 Voltage Rating03 Frequency04 No. Of phase05 Degree of protection06 System fault level07 Auxiliary supply08 Power supply for spring charging

09Clearance in air Phase to phase: Phase to earth:

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10Main bus & Earth bus size & material

11 CB Rating, Type & no’s

12 Contactor Rating, Type & no’s

13 Switch Rating, Type & no’s

14 Fuses Rating, Type & no’s

15 Protective relay Rating, Type & no’s

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ITEM 2 TEST OBJECTIVE REMARK2.1

2.2

Objectives

To commission 6.6 KV/ 11KV Switchgears Incomer Tie and out going feeders.

Proposals

Commissioning HT Switchgear is proposed in the following steps.

Pre commissioning tests Commissioning Checks.

ITEM 3 SERVICES REQUIRED REMARK

3.1

3.2

3.3

3.4

Availability of competent testing team with required test kits for conducting tests.

Availability of operating personal to carry out/coordinate activities.

Availability of lighting arrangements and communication facilities in operating floors.

Availability of LT power supply

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ITEM 4 SAFETY REMARK

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

All members of the test team and all other persons involved in the testing /commissioning schedule must be made familiar with the contents of the testing /commissioning schedule.

Safe access to and adequate escape routes from the confined areas must be maintained.

The test area must be effectively defined.

Access to the test area shall be restricted where necessary by use of barriers and /or warning notices/Danger Boards.

The test area shall be clear of obstructions.

Permanent lighting, supplemented by temporary lighting wherever necessary, must be availed to give adequate lighting to all equipments.

All hand rails access stairs, ladders, guards and trench covers must be permanently fitted unless specified exempted by the test method.

Safety clearance certificate shall be in force

Fire fighting equipment suitable for electrical fire shall be available.

ITEM 5 EMERGENCY PROCEDURE REMARK

5.1

5.2

The test team should be aware of the procedure to be adopted in case of damage to machinery / injury of any personnel connected to the activity.

The test team should be well aware of the procedures to be adopted in case of any

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5.3

5.4

abnormality in the activity

Fire extinguishers to be used for the quenching minor or major fires.

The testing team should be aware of the first aid procedures to be followed in case of accident involving personnel injury.

ITEM 6 STATE OF PLANT REMARK

6.1

6.2

6.3

6.4

6.5

6.6

6.7

6.8

6.9

Electrical PICL / C&I PICL completed

Safety clearance certificate available.

Protocols shall be signed by the concerned authorities

All services must be available ( as per item No.3)

Erection completion must be ascertained (erection shall be inline with the erection drawings and all punch points must be cleared) and House keeping to be done properly. HT Switchgear all shipping sections are erected as per recommended drawing. All erection log sheets are followed up/signed by concerned agencies for HT Switchgear.

All local and remote instrumentation for the system is complete.

Schemes of Incomers Bus coupler/Tie Panel to be checked for proper functioning. Interlocks and protection system simulation checking to be completed.

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ITEM 7 Visual inspection as per check list-1Testing as per annexure-2Charging as per annexure-3

ITEM 8 Reinstatement & preservation

i. Check the vermin proofing of all cable entries & spare gland holes thoroughly.

ii. Check all doors & covers closed properly.

ITEM 9 Staffing.

During testing & charging of panels adequate & Skilled staff members are required with a proper mode of communication

ITEM 10

10.1

10.1.1

10.1.2

10.1.3

10.1.4

10.2

10.2.1

Responsibilities & communications

Test team leader responsibilities are: -

To ensure that all the items within the testing/commissioning Schedules are compiled.He has the authority to delegate some of the functions and checking contained within the schedule. Functional responsibilities of team members shall be clearly defined and communicated To ensure that the effective communications link has been set up and the other affected operating plant.To ensure that the detailed log of all events has been kept.All test team members have responsibility of carrying out the test method in a manner that will safe guard both plant and personnel

Communications:

A reliable communication system must be

8





10.2.2established between the unit control board and switchgear floor.The test team should have a clear understanding of how they should communicate with other during testing.

9





ITEM 11.1

SAFETY CIRTIFICATES.

This is to certify that the 6.6kV / 11kV switchgear to be tested is complete in all respects necessary for the testing and clearance is hereby accorded for its test run.

APML

Electrical

Erection ____________________

Electrical

Commissioning ___________

Contractor

______________________

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11.2 Checklist -I

Visual and Mechanical Inspection Remarks

11.2.1

11.2.2

11.2.3

11.2.4

11.2.5

11.2.6

11.2.7

11.2.8

11.2.9

11.2.10

Inspect for physical damage.

Compare equipment nameplate data with the latest diagram and report discrepancies. Inspect for proper alignment, anchorage and grounding.

Inspect doors, panels and sections for dents, scratches, fit and missing hardware or devices.

Inspect bus insulation and insulators for contamination, cracks, chips or any damage that would impair the insulation characteristics.

Check shutter operation, cell switches, and grounding mechanisms for proper operation. Check the cell fit and alignment. Check the racking mechanism.

Inspect CT and PT installations.

Check the breaker cell alignment. Check alignment and penetration of the breaker primary contacts with the bus connection. Perform mechanical operator and contact alignment tests on both the circuit breaker and its operating mechanism. When applicable, verify that filters are in place and/or vents are not obstructed.

Check breakers for interchangeability.

Verify the shipping split bus connections are installed properly and the manufacturer's bolt torquing recommendations are followed. Verify proper installation of the insulating

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11.2.11

11.2.12

11.2.13

11.2.14

11.2.15

11.2.16

11.2.17

11.2.18

11.2.19

boots.

Contact resistance tests are performed.

Check control fuses, wiring, terminal strip identification with the manufacturers drawings and one line drawings. Disconnect all temporary wiring jumpers.

Current Transformer Tests

On all current transformers (CT's), including ground sensors, perform the following using the one line drawings.

All shorting screws removed.

Inspect for physical damage and compliance with design drawings. Report discrepancies or damaged/missing components..

Perform a 500 VDC insulation resistance test on the CT and the secondary control circuit. Do not perform this test on circuits with solid-state or microprocessor relays.

Verify there is only 1 ground on the relay current circuit.

Verify each CT current circuit by injecting 1 amp current from the CT secondary and check for this current at applicable devices while observing proper polarity.

To prevent nuisance tripping on feeder energization, confirm correct installation of phase conductors, ground conductors and shield conductors associated with CBCT applications.

12





11.2.20

11.2.21

11.2.22

11.2.23

11.2.24

11.2.25

11.2.26

11.2.27

11.2.28

Potential Transformers and Control Power Transformers Test

Inspect for physical damage and compliance with the design drawings. Report discrepancies or damaged/missing components.

Check mechanical clearances and proper operation of PT disconnecting and grounding devices. Use an ohmmeter to ensure good connection continuity.

Verify proper operation of grounding or shorting devices.

Winding insulation resistance is measured from primary-to-ground, secondary-to-ground, and primary-to-secondary. Disconnect solid-state and microprocessor devices before performing this test.

Perform a polarity test to verify HI-XI polarity marks.

Determine the turns ratio by the potential method.

Verify connection of secondary PT leads by applying 110 volts to the leads and checking for the voltage at applicable devices.

Verify primary and secondary fuse ratings (or circuit breaker ratings) match the manufacturer's drawings.

On double-ended switchgear, perform a phasing check to ensure correct bus phasing from each source. (annx-3)

13

30001531, 09/04/11,

Not applicable.





Surge Arrester Test

When provided, an insulation resistance test shall be performed on surge arresters. The test voltage is 2500 VDC. Typical minimum results are 2500 megohms for 11 kV switchgear, 1000 megohms for 6.6 kV switchgear. The “kV+1 Megohm Rule” provides a guideline for the minimum acceptable insulation resistance value.

Meter Calibration

Calibrate the metering equipment shown on the one line diagram, i.e., voltmeter, ammeter, power factor meter, kWh demand meter, etc., in accordance with the manufacturer's instructions.

Transducer Calibration

When provided, calibrate watt transducers and current transducers for a 4-20 mA output.

DC Bus Test

Prior to connecting 220 VDC from the station batteries to the DC bus, an insulation resistance test is performed on the circuit with a 500 VDC megger.

Functional Test

The functional test of electrical circuits is performed with the circuits as close as possible to the normal operational mode. During functional tests, minimize the number of circuit breaker operations.

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Example: If a vacuum circuit breaker (VCB) is tripped by an 86 device, only one trip of the VCB is required. After initial trip of the circuit breaker by the 86 device, only the 86 device is required to operate.

The functional test should include alarms, lock-outs, field contacts, space heater circuits, and controls, etc. When the functional test is complete, the control circuit should be ready for service. Inspect indicating and control devices for correct operation.

Protective Relays

Relays are inspected for physical damage and compliance with the final one line diagram. If blocking restraints are used, remove before making the electrical tests.

When applicable, perform the following checks and inspection. Inspect the cover gasket and cover glass. Check for the presence of foreign material, corrosion, and moisture. Check the condition of contacts. Inspect shorting hardware, connection paddles and/or knife switches.

When applicable, check mechanical freedom of movement, proper travel and alignment, and tightness of mounting hardware and tap screws. Verify target reset . When applicable, inspect targets. Verify pickup and dropout operation of targets.. When applicable, set the displays contrast.

Report any damaged or missing components.

Each adjustable relay shall be set, calibrated, and tested with a relay test set. Settings,

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calibration points and check points conform to the Relay Setting Sheets.

Using the final Relay Setting Sheets provided, calibrate the relays in accordance with the manufacturer's instructions.

For microprocessor based relays test as per manufacturer’s procedure.

Configure the alarm LEDs & trip LEDs.

16

30001531, 09/04/11,

It is suggested to perform contact resistance test of the entire 11 / 6.6 KV Bus.





Annexure -2

Test of Beaker.

Substation: Feeder name :

Area: Unit Numb

Make

Type

Rated Volts

Rated Current

Rated Frequency

Breaking Current

Serial Number

2. INSULATION RESISTANCE TEST

ReferenceMeasured Values in Giga Ohms

Phase - R Phase - Y Phase - B

Pole - Earth

Pole - Pole

Across Pole (CB Open)

3. CONTACT RESISTANCE VALUE :Reference Applied current Resistance value(µΩ) Result

R – R’

Y – Y’

B – B’

4. TIMING TEST : (ms)Phase R Y B

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CLOSE

OPEN

CLOSE-OPEN

5. OPERATION CHECKS:

ReferenceVoltage (% of rated Control

Voltage)Checked

Close80

110

Open 65

120Spring charge 80

6. COIL RESISTANCE:

Reference Measured Values in OhmsSpring charge motor

Closing CoilTripping Coil

7. HIGH VOLTAGE TEST:

ReferenceMeasured Values

KV MinsLeakage

current(mA)R - Phase Y- Phase B - Phase

8.INSULATION TEST (AFTER HV TEST):

ReferenceMeasured Values in Giga Ohms

Phase - R Phase - Y Phase - B

Pole - Earth

Pole - Pole

Across Pole (CB Open)

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SIGN

APL COMM APL PROJ CONTRACTOR

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POTENTIAL TRANSFORMERS.


Area: Unit Number:

1. NAME PLATE DATA’S:

Manufacturer :

VT Ratio :

Ratio

VA

Class

Sr.No.

R-Phase

Y-Phase

B-Phase

2. INSULATION RESISTANCE TEST:

Description DC Voltage applied

Values GΩR Phase Y Phase B Phase

Primary to Earth 5KV

Primary to core-1 5KV

Core 1 to earth 500V

3.POLARITY CHECKS:

Reference R Y B

Core 1

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4. WINDING RESISTANCE TEST:

Description Values Ω

R Phase Y Phase B Phase

Core -1

PRIMARY INJECTION TEST:

Ratio Check:-

Applied voltage (V)

Actual sec voltage(V)

Measured voltage (V)

R Y B

6.TESTING INSTRUMENTS DETAILS:

Particulars Make Sr.No Cal. Due date

Multimeter

IR Tester

Micro ohm meter

Remarks:

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SIGN


22





CT TESTING


Area: Unit Number:


Manufacturer :

Frequency :

CT Ratio :

Core-1 Core-2

Ratio

VA

Class

Serial Number

R-Phase

Y-Phase

B-Phase

2. POLARITY CHECKS:

Reference R Y B

Core -1

Core -2



Values GΩR Phase Y Phase B Phase

Primary to earth 5KV



Primary to core-1 5KV

Primary to core 2 5KV

Core 1 to core 2 500V

23






Description R Phase Y Phase B Phase

Core 1

Core 2

5. PRIMARY INJECTION TEST:

Current injected in

amps

ActualSec.

current

Measured secondary current (A)

Core-1 Core-2

R Y B R Y B

6. KNEE POINT TEST:

Applied Voltage Measured current (mA)R Y B

Remarks:

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GENERAL VISUAL INSPECTION

NAME PLATE

PRIMARY SIDE P1 & P2 MARKING

TIGHTNESS CHECK AT CT SEC. TB – CABLE COMPARTMENT

TIGHTNESS CHECK AT CT SEC. TB – LV COMPARTMENT

POSITION OF P2 - TOWARDS BUS / TRANSFORMER

7. MECHANICAL AND ELECTRICAL CHECKS

8. TESTING INSTRUMENTS DETAILS:

Particulars Make Sr.No Cal. Due

date

Multimeter

Ac leakage Tester

Ac Clamp Meter

IR Tester

Remarks:

25





SIGN


26





CBCT TEST:-

Substation: Feeder Name :

Area: Unit Number:


Manufacturer :

Frequency :

CT Ratio :

Ratio

VA

Class

Serial number

2. POLARITY CHECKS:

Reference R Y B

Core -1

Core -2



Value GΩ

Secondary to Earth 500


Description Value Ω

Core 1

27





5. PRIMARY INJECTION TEST:

Applied current(A) Actual sec current(A) Measured secondary current (A)

6.MECHANICAL AND ELECTRICAL CHECKS

Remarks

GENERAL VISUAL INSPECTION

NAME PLATE

PRIMARY SIDE P1 & P2 MARKING

TIGHTNESS CHECK AT CT SEC. TB – CABLE COMPARTMENT

TIGHTNESS CHECK AT CT SEC. TB – LV COMPARTMENT

7.TESTING INSTRUMENTS DETAILS:

Particulars Make Sr.No Cal. Due date

Multimeter

Ac leakage tester

Ac clamp meter

IR Tester

Remarks:

SIGN

28





APML COMM APIL CONTRACTOR

29





SURGE ARRESTER

Location :

1) NAME PLATE DETAILS:-Manufacturer : Type: Rated Voltage: Residual Voltage: Continuous Running Voltage: Serial No:

2) INSULATION RESISTANCE TEST:

R Phase Y Phase B PhaseApplied DC Voltage/1Min 5000V 5000V 5000V

IR Value(Before Hipot)

IR Value(After Hipot)

3) Withstand Voltage Test (DC):

R Phase Y Phase B Phase

U1mA(Voltage at 1mA leakage Current)

75% of U 1mA

Leakage Current at 75% of U 1mA

4) TESTING INSTRUMENTS DETAILS:

Sl.No Instrument Used Make Serial Number

1

Remarks:

SIGN


30





Relay Test:-

DESIGNATION: Relay Test LOCATION : 6.6KV SWITCHGEAR

FEEDER : MAKE:

TYPE SERIAL NO.:

1.MEASUREMENT CHECKS:

Phase RefCurrent & Voltage Applied

Current Measured in RelayProtection Core Metering Core

Ia Ib Ic Ia/Uab Ib/Ubc Ic/Uca

Ia 1A

Ib 1A

Ic 1A

Ua-b 110V

Ub-c 110V

Uc-a 110V

1. OVERCURRENT PROTECTION:

Definite Time Characteristics:

R/Y/B Ct set(A) Ct Inj (A) Time Set(s) Operated time(s)

I_OC1

I_OC2

I_OC3

IDMT Characteristics:

I_OC3 Ct set(A) Ct Inj(A) Tp(TMS) Actual time(s) Operated time(s)

Stand.Inv

Very.Inv

Ex.Inv

31





2. VOLTAGE CONTROLLED OVERCURRENT PROTECTION:

I_OC1 Ct set(A) Ct Inj(A) Time Set(s) Operated time(s)

R/Y/B

V_Neg OV-6VVpp_UV_VCE-68V

- -

3. THERMAL OVERLOAD PROTECTION:

R/Y/B Ct set(A) Ct Inj(A) Time Set(s) Operated time(s)

I_OL

5. CALCULATED EARTH FAULT (3I0):

R/Y/B 3IO_Set(A) R-Set(A) Y-Set(A) B-Set(A) Time set(S) Operated time (S)

3I0_1

3I0_2

6. CURRENT TRANSDUCER:

I Set(A) Actual DC(mA) Measured DC(mA) Remarks0 4

0.50 121 20

TESTING EQUIPMENT USED:

Equipment Name : 3 Phase – Secondary Injection KitMake : Model No. :Sl. No.

SIGN


32





33





Bus PT Relay:-

DESIGNATION: HT Switchgear Bus PT LOCATION :

FEEDER : MAKE: NANJING NARI

TYPE RCS9628CN SERIAL NO.:

RefVoltage Applied

Voltage Measured in RelayProtection Core Metering Core

Ua-b Ub-c Uc-a Ua Ub Uc

Ua-b 110V

Ub-c 110V

Uc-a 110V

4. UNDER VOLATGE PROTECTION:

R/Y/B Vt set(V) Pick Up (V) Time Set(s) Operated time(s)

V_UV1V_UV2V_UV3

5. OVER VOLTAGE PROTECTION:

R/Y/B Vt set(V) Pick Up (V) Time Set(s) Operated time(s)

V_OV

5. RESIDUAL OVER VOLTAGE PROTECTION:

PHASE Vt set(V) Pick Up (V) Time Set(s) Operated time(s)

V_ROV

34





TESTING EQUIPMENT USED:

Equipment Name : Make : Model No. : Sl. No. :

SIGN


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SCHEME TESTING

Type of Breaker:- LOCATION:- FUNCTIONAL CHECKING:-2.1 MANNUAL OPERTAIONS:CLOSE/TRIP EARTH SWITCH OPERATIONSPRING CHARGE BREAKER RACKIN RACKOUT

OPERATION2.2 ELECTRICAL OPERATIONS:2.2.1. LOCAL OPERATIONS:

SA1 SWICH LOCAL BREAKER TEST POSITION

BREAKER OPERATION (SA2 SWITCH)CLOSE TRIP

2.2.2 REMOTE OPERATIONS:

SA1 SWICH REMOTE BREAKERSERVICE POSITION

BREAKER OPERATION (SA2 SWITCH)CLOSE TRIP

3. PROTECTION :3.1 TRIPPING CONTACT:

REFERENCE RELAY TRIPPING CONTACT TERMINALS

STATUS

PROTECTION RELAY

3.2 LOCKOUT RELAY (86):REFERENCE CONTACT TERMINALS STATUSPROTECTION

RELAY

3.3 ANTIPUMPING FUNCTION: -------------------

4. MECHANICAL INTERLOCK: ---------------------

4.1 BREAKER INTERLOCK: ------------------------

EARTH SWITCH POSITION CLOSEBREAKER POSITION

INTIAL POSITION SERVICE POSITIONTEST

4.2 EARTH SWITCH INTERLOCK:BREAKER POSITION SERVICE

EARTH SWITCH OPERATION

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5. INDICATION CIRCUITS:CLOSE (RED) SPRING CHARGE

(WIGHT)OPEN (GREEN) FAULT (YELLO)TEST POSITION (RED)

SERVICE POSITION(GREEN)

EARTH SWITCH CLOSE INDICATION(YELLO)

6. BREAKER COUNTERS OPERATION: ------------------7. REMARKS:

SIGN


FUNCTIONAL CHECKS:

1) 1. AC Circuits

a) Cubicle Illumination Lamp Operation

b) Door Switch Operation

c) Heater ON/OFF Switch

d) Sensor Operation

e) Fan ON/OFF

REMARKS:

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SIGN


38





ITEM 11-3 Annexure-3

11.3.1

11.3.2

11.3.3

11.3.4

11.3.5

11.3.6

11.3.7

11.3.8

11.3.9

11.3.10

Civil, Erection, Pre-commissioning & Commissioning activities are completed for the HT swgr, HT Busduct.

Completion of the primary & secondary earthing including earth pits & interconnection of primary earthing with the main plant earthing gridRelay settings adopted for upstream CB & 6.6 KV SWGR Incomer, Bus coupler & Bus PT panels

Availability of 220 V D.C. control supply & 415 V A.C. Supply for HT swgr

Clearance obtained from working parties.

6.6kV / 11 kV switchgear shall be in a condition ready for charging. Remove all temporary Grounds from the switchgear. Ensure that all covers are closed

Test & record final IR value of the HT cable from upstream CB to the 6.6 KV /11kV swgr

Test & record final IR value of the bus

Inspect 6.6kV/ 11kV Incomer panels. Incomer- 1, Bus coupler & Bus PT CBs shall be racked in to Service position. Confirm that relays are in Service, and all alarms are reset.Note upstream Bus voltage and confirm that it is within normal range (6.6kV/ 11kV ± 5%).

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11.3.11

11.3.12

11.3.13

11.3.14

11.3.15

11.3.16

11.3.17

11.3.18

11.3.19

Inspect the charged portions for any abnormality

Check the Voltage at the incomer # 1 relay & voltmeter. Record PT secondary voltages in the table below. Confirm the positive phase sequence

Close incomer # 1 CB thereby charging the Bus 1

Inspect the charged portions of switchgear for any abnormality

Check the Voltage at the Bus 1 bus PT voltmeter & relay. Record PT secondary voltages in the table below. Confirm the positive phase sequence

Rack in & close the bus coupler CB, thereby charging the Bus 2 of the swgr

Check the Voltage at the Bus 2 bus PT voltmeter & relay. Record PT secondary voltages in the table below. Confirm the positive phase sequence.

Phase out between the Incomer, Bus-1 & Bus- 2 PT’s & Record. A proper phase match is essentialNote Energy meter readings of 6.6kV Incomer panels

40





Voltage recordInc-1 PT Bus-1 PT

(fed from I/C-1)

Bus-2 PT (fed from I/C-1)

Measurement terminal nosVan

Vbn

Vcn

Vab

Vbc

Vca

Va-earth

Vb-earth

Vc-earth

Vn-earth

3.1 Phase-out recordI/C-1 PT Bus-1 PT Voltage (Volts) Remarks

Va Va

Vb

Vc

Vb Va

Vb

Vc

Vc Va

Vb

Vc

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Bus-1 PT Bus-2 PT Voltage (Bus-1 and Bus-2 fed from I/C- 1 only)

Remarks

Va Va

Vb

Vc

Vb Va

Vb

Vc

Vc Va

Vb

Vc

Remark:-

Phase sequence check OKPhasing in OK

SIGN


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Defect List

Sl.No. Description of Defects Remark

SIGN


43





44

ht panel commissioning

Documents

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voltage protection

voltage transformer

voltage meter

fc circuit cabinet

protection class of

vacuum circuit breaker

6kv11kv switch cabinet