Answer / monty

Fristly understand
MCCB- module case circuit breaker & SFU- switch fuse unit

SFU- it is a combination of a fuse and isolator

MCCB-it is just like a MCB(miniature circuit breaker) but there is a small difference we can vary the range of MCCB means if you have 100A mvvb than you can use it for less than 100 A also but in MCB it is not possible so we can say that MCCB is a variable fuse.

Answer / dev

can we replace switch fuse unit with MCCB

If a Power Transformer Fails and the transformer manufacturer suggest that "Do all electrical test on the transformer?". What are the test to be conducted in this condition?

5 Answers  

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what happen if rotor earth fault in AVR system?

1 Answers  

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why we used stone chips under the transformer area..

2 Answers   SSC,

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what ll happen if neutral is not shorted with phases while doing transformer short circuit test & what ll happen if neutral is connected to ground?

1 Answers  

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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1 Answers  

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Among the following Which is vector quantity? a. Flux b. permitivity c. flux density d. magnetic intensity

2 Answers  

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1 Answers   Neucel,

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when we r using single phase load and we have power cable of 3.5core with .5 of neutral and neutral is suppose to the returen path of the phase how much current will flow in the neutral.reply.

2 Answers  

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what take 100 w take current

1 Answers   SoftLogic,

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why all transformer colour is same?

3 Answers   OPTCL,

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0 Answers  

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