Answer / sudhansu kumar dalei

The BDV of oil in transformer is 60 KV/1 min within the gap
of 2.5mm in the test vessel of oil test kit.

Answer / rajesh kumar.k

As per IE rule it should withstand 40kv/min.

Answer / yog111283

as per rule. after oil filteration oil sparking value must
be more than or at list 60 kv

Answer / kishore

the minimum aceptable value of breakdown voltage in BDV
test is >30KV

Answer / nitin arora

It depends on the voltage rating of the transformer
IF transformer rating is less than 72 KV then minimum BDV should be 30 KV.
IF transformer rating is 72 to 170 KV then minimum BDV should be 40 KV.
IF transformer rating is more than 170 KV then minimum BDV should be 50 KV.

All above results are referring the 2.5 MM gap during test.

Answer / r.manimaran

For veryfication of oil purity every year to be checked the
BDV(breakdown voltage),we have take out the transformer
oil in the transformer and collect in the high voltage kit
inthe kit two stem will be there within the 2mm gap and
then apply the high voltage 50kv for 1 minute and it
shiould be withstand upto the mentioned time.Otherwise oil
to be filtered.

Why does the radius of armature is less than the radius of pole shoe?

0 Answers   ABB,

what is 33 /11kv transformer bdv

8 Answers   NMDC, TPPL,

what is the difference between active power and reactive power and apparant power in practical as well as theoritical

0 Answers  

What is working principle of washing machine?

9 Answers   IBPA, Samsung,

why we measure ouput of transformers in kva.

1 Answers  

what is the purpose of reactor in electrical substations ?

2 Answers  

can a rotating machine give the DC output without commutator? if yes, how? if no, why?

6 Answers   BARC,

how is differential relay working in transformer.comparison with generator defferntial relay

1 Answers  

At 765Kv, I have seen the use of PT at line side for metering and CVT for protection, although as far as my knowledge is concern, PT at this voltage level will have huge loss and more cost as compared to CVT as CVT can also perform same function of Protection and Metering? So my question is why use PT and not CVT for metering and protection in order to reduce the cost.

1 Answers  

During Testing of Maintenance Free Earthing, How deep should be the Spikes of Earth Test Meter should be inserted in the soil(one spike is 15 Meter & Other spike is 30 Mtrs away from the Main Earth Electrode. Because, recently, we observed that when spike is inserted 3-4 Inch in the earth- results are better, If spike is inserted 1 feet deep than results are increasing.

0 Answers  

why transformer calling in VA rating

6 Answers  

Draw the circuit of clapp oscillator?

0 Answers