Method Statement of HV Test

Contract No. D-6990 Replacement Work of 11kV SWGR at W13,E15& Salt and Chlorine Substations Substations Rev. 0

Ref: D6990/RK/15 Method Statement for High Voltage Test at 11kV GIS SWGR

1.

Purpose: This method statement will give a brief steps to be carried out during the AC High voltage testing.

2.

Scope: The method statement applies to New 11 KV GIS SWGR at W13,E15&SLTC site.

3.

Responsibilities:

1.

Testi esting ng and and com commiss missio ioni nin ng Engin gineer eer (Co (Compet mpeten entt Perso erson n): Obta Obtain in safety document from concern authorities, Ensure the work done as per method statement & Testing of the scheme.And to conduct the toolbox talk.

2.

Elec Electr tric ical al Tec Techn hnic icia ian: n: Wor Worki king ng on on the the SWGR SWGR und under er dir direc ectt supe superv rvis isio ion n from Testing and Commissioning Engineer.

3.

HSE Officer: er: Ide Identify all potential haza azards and coordinate ates with competent person to properly control these hazards.

3.

Method: Preparation Preparation work: Before Before the commen commencem cement ent of any electri electrical cal task the follow following ing checks are required to be carried out. SAFETY PRECAUTIONS:

1) Make sure sure work work area area is clean,al clean,alll floor openings openings are are closed. closed. 2) Testing Testing Area to be barricad barricadee with red & White chain chain & Warning Warning Signs Signs to be displayed. 3) Only Author Authorized ized & Testing Testing personal personalss to be allowed allowed in the the barricaded barricaded area of work with the adequate PPE’s. 4) Ensure Ensure the testing testing equipmen equipments ts are calibrated calibrated and the certificate certificate Validity Validity.. 5) Ensure Ensure Proper Proper leads leads & Clamps Clamps for the Connec Connections. tions. Page 1 of 4

Contract No. D-6990 Replacement Work of 11kV SWGR at W13,E15& Salt and Chlorine Substations Rev. 0


6) Ensure the Earthing of the GIS SWGR. 7) Ensure the Discharge Rod is connected with the Earth. SAFETY EQUIPMENTS:

1) GLOVES. 2) DISCHARGE ROD. PROCEDURE: 1) Ensure NO power cables are connected in 11kV GIS. 2) Prior to start the test on BUSBAR –A all breakers to be kept in CLOSE condition except Bus –Section breaker. 3) Ensure the Bus-Section Breaker in OPEN condition. 4) Ensure the Bus Earth Switch & Voltage transformers are in ISOLATED or OPEN condition. 5) Ensure the CT Secondary Circuits are Shorted and earthed. 6) Select +K01 as a reference panel for applying the HV at Bus – A. 7) Select the R Phase for the testing and remaining two phases Y & B to be shorted with earth. 8) Apply 5kV DC Voltage between ‘R’ Phase of +K01 and earth through the calibrated IR Tester for a time duration of 1 MIN. 9) And the Values to be recorded as shown in the test format. 10) Discharge the tested Phase by using the discharge rod & Safety gloves. 11) Repeat the above procedure for the remaining two phases say Y & B. 12) Ensure the Healthiness of the 11kV GIS SWGR insulation through the IR Test Values.

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13) Ensure the Proper earthing of HV Test equipment prior to start the HV Test. 14) Select the R Phase for the testing and remaining two phases Y & B to be shorted with earth. 15) Apply 3kV AC Voltage on R-Ph at Busbar – A. 16) Ensure the healthiness of all HV Indicator ( CAPDIS) mounted at 11kV SWGR. 17) Increase the AC Voltage smoothly to 80% of FAT Value( Power Frequency Voltage test ) or else say 25kV on R-Ph for the time duration of 1 Min. 18) Record the Values as shown in the approved test format & ensure that SWGR is withstanding for the test value. 19) Reduce the Voltage gradually to zero. 20) Discharge the tested phase in safe manner by using the discharge rod with the HV safety gloves. 21) Test to be carried out for the remaining two phases in same manner(i.e., Item no :14 to 20).

NOTE: Above same Procedure to be follow while doing HV Test for Bus Section-B.

Attachements :

1. Risk Assesement. 2. SAT Format.

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Method Statement of HV Test

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