Answer / n.venkidusamy

I think that site tests.ie. Pre commissioning Tests of
following.
1. Insulation Resistance Test for breaker and protection
and other cables
2. Check for spirit level
3. Mechanical spring charge test
4. Mechanical ON/OFF test
5. Electrical spring charge test
6. Electrica ON/OFF Both Local and remote Test
7. Contact resistance Test
8. opening and Closing timings tests.
9. Protection trip Test
10. Check for operation of Closing coil at 80% and Trip
coil at 70% rated Control D.C.voltage

Answer / pillay

I belive you mean commisioning tests.
some of them are,
A)INSULATION TEST
b)contact resistance test
c)HV holding test
d)primary and sec injection test on the protection cct
e)transformers insulation, ratio test,vector group, insulating
oils dielectric tests.
f)cables insulation, phasing test

Answer / mriganka das

Transformer:
1)IR Test
2)Magnetising Current Test
3)Magnetic Core Balance Test
4)Vector Group Test
5)Ratio Test
6)Polarity Test
7)Oil Test (DGA,Dielectric Strength,Moisture content)
8)RLA test (Dirana, Thuran)
Current Transformer :
1) Ratio Test
2) IR Value Tset
3) Polarity Test
4) Knee Voltage Check
5) Winding Resistance Test
6) Back to Back Test
7) Tan Delta Test
8) High Voltage Test
Breacker Test:
1) IR Value Tset
2) Contact Resistance Test
3) Closing Tripping Timing Test
4) High Voltage Test
Isolator Test:
1) IR Value Tset
2) Contact Resistance Test
3) Closing Tripping Timing Test
4) High Voltage Test
5) Hot point Check ( in running condition)

how many winding in the single phase transformer?

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