Answer Posted / jim sreedharan

For 33 KV cables we do three tests.

1. Vlf Test: We apply 10 kv dc between graphite and armour
at a low frequency (normally between 0.02 hz to 0.05 hz)
for 1 hour.

2. Insulation Resistance :- We apply 5 kv dc for 1 min

3. High Voltage ac Test:- We apply 57.1 kv for 30 mins
(33/1.732)x 3 = 57.1 kv

God Bless

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