Answer / anadi biswas

Hi dear,
First of all tell me the condition
Are all these running parallel?If yes,then check the
individual winding to body insulation resistance with a
Multimeter.
Also you may check the transformer oil properties i.e.
dielectric strength as well in order ensure the minimum
leakages.

If individually connected , then check all the above+ the
nature of loads connected with the earthing system.
Also in all the above case check the body earthing of each
tranformer with Earth pits connected and individual earth
pits and measure the value. You will get the conclusion.

Answer / sreenu

Hi dear,

Pls check the differential relay is not working properly, if its work this problem not faced. Pls check the primary current is equal to secondary current more than 30 times to the secondary winding.

Ex; if u have 2500kva transformer gives secondary current as per designing it vl gv 3477Amps is equal to primary current. Both r matches their is no problems transformer.

Answer / k.prakashchandra

Check the insulation resistance of No. 1.Connect a voltmeter
between body and the earth and measure the leakage voltage
which is expected to be more 86V.Unbalanced currents are
also due to contact resistance .

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