4-Why we measure the insulation resistance of main core and frame in spite of

4-Why we measure the insulation resistance of main core and
frame in spite of that must be connected with ground

before energize the transformer?

Question Posted / sun-moon

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4-Why we measure the insulation resistance of main core and frame in spite of that must be connect..

Answer / rachuri_sree

If there is any fault in the winding or core, the fault
current should be grounded and transoformer should be
tripped on on earth fault. If the transformer is healthy
the insulation resistance measured will be with in the
permisible value.

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4-Why we measure the insulation resistance of main core and frame in spite of that must be connect..

Answer / mrudang

the 2 nd answer is quite right ,

actually we have to know the value of core insulation
its resistance , for its condition ,we have the standads
for it , and match with those value

if there is leakge current , the value should be lesser
we are doing between phase- earth , and phase to phase
so we match the phase to phase value also

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4-Why we measure the insulation resistance of main core and frame in spite of that must be connect..

Answer / sr

Before energizing the transformer we are conforming that
the insulation of the core is healthy.if it got earthed
twice there will chance of circulating current during fault
condition.

Is This Answer Correct ?

1 Yes

2 No

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