Answer / dinesh kumar

TRANSFORMER OIL BDV is carried out as per IS-336 for nomal
and IS-12463 for High viscosity oil.
1.Take one sample from top of Transformer and one from the
bottom of transformer.
2.The BDV of oil should withstood min 50 KV
3.The gap between the test sample is 2.5mm maintained
4.Each sample(top/bottom) should be checked seperately
5.Procedure
a.Voltage should be gradually increased from 0.
b. At one point Flash will take place and that point is
termed as Bread down Voltage

Answer / selvan

answer 1 is very correct.

Answer / sri rama murthy

the breakdown voltage need not be 50kv but the min BDV is
30kv at 2.5mm gap between the electrodes

Answer / hamed

Regarding the withstand voltage I think It depends on the
type and quality of the oil itself.

Answer / deepak sharma

Please anyone can tell me the dia. of the electrodes?????

Answer / v.b.vijay anand

At first thing you maintain the electrical norms..To Take one sample from top of Transformer and one from the
bottom of transformer.
On before take oil samples you should confirm the moisture particles removed are not..
And then removed the air boubles in that vessel between the electrode...
The BDV of oil should withstood min 50 KV...
The gap between the test sample is 2.5mm maintained..
Voltage should be gradually increased from 0.
You will wait min 30min then only you will get good result..

Answer / muhammad owais

tell me why take sample both side (top/bottom)?
why not take from bottom any problem

Answer / saravanan.m

*Take one sample from top of Transformer and one from the
bottom of transformer.
*The BDV of oil should withstood min 50 KV
*The gap between the test sample is 2.5mm maintained
*Each sample(top/bottom) should be checked seperately
*Procedure
a.Voltage should be gradually increased from 0.
b.At one point Flash will take place and that point is
termed as Bread down Voltage.
*If its withstand means the viscosity of transformer oil is
good

Answer / suthagar.s

that means the transformer oil withstand the temparature
capacity that is called as breakdown voltage test in
transformer

Amoung all classes of electric machines, why the transformer uses oil as one medium of cooling?

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