Friday, December 24, 2010

TESTING TIPS -2

Voltage for fuse failure relay should take at final stage of the voltage circuit.
It will block the operation of the main relay if any open wiring and faultily FT switch open operations.

Monday, December 20, 2010

DESIGN TIP -1 CT CIRCUIT

1.CT secondary star point should be equipment side and P2 should be equipment side.

Thursday, December 16, 2010

CT CIRCUIT

To short the live CT put short link in the CT TB
To Isolate the equipment from the CT circuit open the CT FT switch

Monday, December 6, 2010

AC power panel Commissioning

AC power panel Commissioning

Set the proper current value in the main incomer MCCB.

Because when AC panel components operates the current goes peak value. This peak current should be withstand incomer MCCB.





Sunday, December 5, 2010

380 KV GIS HI POT TEST

HI POT TEST

1. WHILE APPLYING VOLTAGE IN ONE PHASE OTHER TWO PHASE SHOULD BE EARTH
2. 380 KV APPLIED VOLTAGE FOR NEW SYSTEM = IMPULSE VOLTAGE X 40 % X 80%

EXAMPLE : - FOR 380KV 1425KV X 0.4 X 0.8 = 515 KV

3. SECOND TIME = Un X 1.2 = 380KV =454 KV

4. MEASURE SECONDARY VOLTAGE IN FLUK MULTIMETER 187 DON'T USE OTHER MULTIMETER

5. IF NEAR BUS IS ALREADY CHARGED ONLY SWITCHING TEST IS DONE . MEANS NEW BUS AND EQUIPMENT IS CHARGED WITH RATED VOLTAGE AND MONITOR 24 HOURS.

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THIS IS SIVA T&C ENGINEER IN NCC LTD - SAUDI.