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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?
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Answer Posted / 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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