Answer Posted / j.kesavan
Dar means dielectric absorption ratio test in HT
machines.HT megger reading 1minite/30second reading is Dar
test.
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For a 6.6kV Motor it is recommended to do megger test with 500 V d.c and not more than 5kV d.c but the Hi voltage withstand test should be performed by 12kV AC. Why the dc voltage test should be limited but AC voltage withstand test could be with such a high voltage?
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