What is the cause for a blown fuse in one phase of primery side(HV) of a three

What is the cause for a blown fuse in one phase of primery
side(HV) of a three phase transformer( 4169v-460v) in the
time of closing its supply breaker.
There is no load on the secondery side of the transformer
in this moment.

Question Posted / saeid

3 Answers
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What is the cause for a blown fuse in one phase of primery side(HV) of a three phase transformer( ..

Answer / engr.abdurrahim

As your Question, I think in your transformer is having
interturn fault or single phasing or may be LG
fault.Without load if any fuse blown means connected things
(Transformer)itself having problem.

Solution:
Do the Meggaring and check insulation between, phases at HV
side,LV side,
Check insulation between phase to neutral, Phase to earth.
Check Earth resistance also.

Is This Answer Correct ?

5 Yes

2 No

What is the cause for a blown fuse in one phase of primery side(HV) of a three phase transformer( ..

Answer / pillay

It could be just high inrush current,
incorrect fuse size or a defective fuse
in the first place.If it recurs than
further investigations should be taken.

Is This Answer Correct ?

3 Yes

0 No

What is the cause for a blown fuse in one phase of primery side(HV) of a three phase transformer( ..

Answer / niranjan

Due to high inrush of current or there may an inter turn
fault on ther primary side of the transformer

Is This Answer Correct ?

1 Yes

2 No

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