hv switching procedure

Appendix 5: HV SWITCHING PROGRAM FIRST PAGE

High Voltage Switching Procedure

Procedure No.: Page 1 of 4

CP Number:

Purpose: To Bring the TG -3101A Power to the 6.6kv Switch Board

Attachments:

Prepared by: Date:

Print Name Signature Checked by: Date:

Print Name Signature Approved by: Date:

Print Name Signature

Legend I ISOLATE: Circuit breaker to be racked out.

E EARTH: Circuit breaker earth switch to be applied.

L LOCKED: High voltage lock to be applied.

T TAGGED: CP Isolation Tag to be applied with Procedure No. (above) written on it.

CHECK DEAD: Item to be tested and proved dead with HV phasing sticks.

Phasing sticks to be tested before and after test.

DEISOLATE: Tags placed under this procedure to be removed

INSULATION TEST: Phase to earth to be checked using a 5kV megger.

Step Action Performed by Time / Date

1 Check the SWBD Grounding is Connected at both Ends. Switch board is barricaded. Confirm Proper Fire Extinguishers are available.

2 Make Sure All Outgoing Motor Feeder are isolated and Padlocked in Outgoing Cable Earthed Position.

3 Make Sure All Outgoing Transformer Feeder are isolated and Padlocked in Outgoing Cable Earthed Position.

4 Check the TG 3101A incomer breaker is Racked out.

5 Confirm the Bus A, Bus B VT Fuses are inserted and Outgoing MCB is OPEN (Open)

APPENDIX 5: HV Switching Program Subsequent Page


Procedure No.: Page 2 Of 4

CP Number:

Purpose: To Bring the TG 3101A Power to the 6.6kv Switch Board

Attachments:

Prepared by: ( ATE / AEE ) Date:

Print Name Signature Checked by: ( AEE ) Date:

Print Name Signature Approved by: ( Comm Mgr ) Date:


Step Action Performed by Time / Date 6 Confirm the TG-3101 B & 3101 S Incomer Breaker is Open and

isolated and Padlocked in Incomer Cable in Earthed Position.

7 Confirm the Bus Tie A-B Breaker is Open and racked out in Isolated position.

8 Confirm the Bus A & B Earth Switch is In OPEN Position

9 Confirm the Bus A is meggered with 5kV Megger and Record its results. R Y+B Grounded _______ Mohms Y R+B Grounded _______ Mohms B R+Y Grounded _______ Mohms

10 Confirm the Bus B is meggered with 5kV Megger and Record its results. R Y+B Grounded _______ Mohms Y R+B Grounded _______ Mohms B R+Y Grounded _______ Mohms

11 Confirm the Phasing Sticks are Working and In Good shape. HV Gloves and Rescue Sticks are Readily available.

12 Run the TG 3101A and Excite TG 3101A.




CP Number:


Attachments:





Step Action Performed by Time / Date 15 On the TG 3101A Incomer Breaker Panel Lift the shutters of the

Cable side and Measure the Phase & Line Voltages. R-Y ____kV Y-B ____kV R-B ____kV

16 At the TG-3101A Cable Side VT Secondary terminal check the Voltage and Phase Rotation is correct. R-Y ___Volts Y-B ___Volts R-B___Volts Freq ___ Hz

17 Rack in TG-3101A circuit Breaker and Initiate CLOSE Command From TG Control Panel.

18 On the Bus Tie Breaker Panel Lift the shutters of the Bus A side and Measure the Phase & Line Voltages. R-Y ____kV Y-B ____kV R-B ____kV And Confirm the Voltages are same in the Bus A Voltmeter

19 At the Bus A VT Secondary terminal check the Voltage and Phase Rotation is correct. CLOSE the VT Outgoing MCB to CSP R-Y ___Volts Y-B ___Volts R-B___Volts Freq ___ Hz




CP Number:


Attachments:





Step Action Performed by Time / Date 20 Rack in Bus Tie A-B circuit Breaker and CLOSE the Breaker from

TG Control Panel

21 At the Bus B VT Secondary terminal check the Voltage and Phase Rotation is correct. CLOSE the VT Outgoing MCB to CSP R-Y ___Volts Y-B ___Volts R-B___Volts Freq ___ Hz

22 Confirm the Voltage is Steady and no abnormal noises are heard.

Appendix 6: HV ELECTRICAL ISOLATION CERTIFICATE

HV Electrical Isolation Certificate

Certificate No.: 1001

CP No.:

1. CERTIFICATE ISSUED TO (ENTER CP HOLDERS NAME):

2. TAG NO. OF EQUIPMENT ISOLATED:

EQUIPMENT DESCRIPTION:

EQUIPMENT SUPPLIED FROM SWITCHBOARD / DB INCLUDING CUBICLE/CIRCUIT NO.:

3. ISOLATION POINTS (INCLUDING PADLOCK NOS.):

4. EARTHING POINTS (INCLUDING PADLOCK NOS.):

5. ADDITIONAL PRECAUTIONS:

6. ISOLATE

I HEREBY CONFIRM THE EQUIPMENT DETAILED IN SECTION 3. ABOVE IS ISOLATED AND SAFE.

AEE: / /

Print Name

Signature Date & Time

7. ACCEPT I HEREBY AGREE WITH AND ACCEPT THE ISOLATION THAT HAS BEEN PERFORMED ON THE EQUIPMENT

DETAILED IN SECTION 6.6 ABOVE AND ACKNOWLEDGE THAT I UNDERSTAND THE LIMITS OF THE ISOLATION. CP HOLDER: / /

Print Name


8. WORK COMPLETE THE SCOPE OF WORK ASSOCIATED WITH THIS ELECTRICAL ISOLATION CERTIFICATE IS COMPLETE AND

THE WORK AREA IS IN A CLEAN AND SAFE CONDITION. CP HOLDER: / /

Print Name


9. DE-ISOLATION THE ISOLATIONS AND EARTHING POINTS HAVE BEEN REMOVED. THIS CERTIFICATE IS CANCELLED. AEE: / /

Print Name


Appendix 7: HV CHECKLIST

CHECKLIST - High Voltage Isolation / Testing

Electrical Isolation Certificate No.:

CP No.:

INSTRUCTIONS:

1. HV Isolation Checklist to be completed by AEE

2. AEE to attach the completed checklist to the original copy of the electrical Isolation certificate

AEE TO

MARK N/A

OR INITIAL

PRECAUTIONS FOR HV ISOLATION

1. TAG NUMBER VERIFIED

2. CIRCUIT BREAKER REMOVED AND VERIFIED

3. CONTROL FUSES REMOVED

4. VTs RACKED OUT

5. CTs SHORTED

6. CIRCUITS CHECKED, TESTED AND PROVEN DEAD

7. CABLES DISCHARGED AND EARTHED

8. EARTHING SWITCHES CLOSED AND PADLOCKED

9. ISOLATION TAGS FITTED TO ALL PADLOCKS

10. LIMITS OF ISOLATION DEFINED ON AA

PRECAUTIONS FOR HV TESTING

1. Minimum of two persons at the work face at all times 2. TEST EQUIPMENT CHECKED AND OPERATIONAL 3. INSULATION MATS IN POSITION

4. AREA CORDONED OPEN - SIGNS AND BARRIERS IN PLACE

hv switching procedure

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