Answer / senthil kumar

we can able to test ac or dc. thats manufactures chosen.in ac hi-pot leakage current will be more(mA).but DC hi-pot leakage current will be less. but dc voltage charge the capacitance. in ac hi-pot we are applying 2V+1X 0.8 in dc hi-pot 2V+1X1.414X 0.8.

Answer / vijay

Yes, we can.
For test voltage we have to apply 80% of factory test
voltage i.e. 80% of 70 kv ac (factory test voltage) =56 kv
for 1 min.

Answer / shaikh

For 33KV Ac Busbar testing, we can apply 5.0k (5000v)DC for
1-3 mints.

Answer / ashish

For Testing Busbar 33 Kv ( HI-POT ) We Have To Apply the (
1.732* 33000)DC Volt for 3 min.

what condition there autotransformer will fail?

2 Answers  

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