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Answer Posted / k.prakashchandra
Roughly,megger values should be 2 Meg-ohms for every KV
rating at 60' C for 11KV and above.The value doubles itself
for every 10' C fall in temp.For LT 500v/1000v megger is
used ,and IR value should be more than 1 M-ohms.For HT 5 KV
megger is used.PI value can also be measured with the
motorised megger.Comparing the values obtained with the
previously obtained for any fall is important
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