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To measure insulation resistance of 11KV cable between core
& armour, what should be the test voltage & duration?
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Answer Posted / sujeet pandey
To measure the insulation resistance of 11kv cable, we need
to keep Megger test voltage at 1kv and take 2 readings; one
at a interval of 15 sec and other at an interval of 1 min.
This will give Absorption Factor which is equal to ratio of
resistance at 1 min to the resistance at 15 sec. If the A.F.
is less than 1.2(a/c to Indian Standards) then the
insulation is not good and we must take the remedy action.
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