WHY EARTHING NOT NEEDED IN BATTERY IN SUBSTATION

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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?

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what is per unit calculation?looking for simple and strong explanation thk u

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Is ground earthing required for neutral conductor of a prime mover ie DG set?

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int a,b ; a=b=10 ; if(a>b){ printf ("%d",a)}; no error output is a=10

2 Answers   TCS,

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Why does an induction generator is preffered as compared to synchronous generator in especially a wind energy power production project?

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PLEASE EXPLANE WHAT IS " MOSFET AC CONVERTER"? WHERE AND HOW IT IS USED?

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for 644KW load which MCCB should i use

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what is slip?

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explain all the classes with example

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In power generator sets, when they are coverted from 50hz to 60hz, the kva rating after conversion increases. For example, the manufacturer of a perkins 200kva @ 50Hz generator set has mentioned it to become 220kva after converstion to 60hz. What is the relation between the frequency & the KVA rating. Any formula please.

3 Answers  

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condition Autotrip facia come on control panel of electrical transmission line?

0 Answers   Getco,

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