Answer / makku

Because of the construction of the transformer core/winding assembly, there can be high potentials induced into the core, causing partial discharges which will damage the transformer. The core ground diverts this voltage safely to ground. The core ground also provides a low-resistance path to ground if there is a short circuit between the winding and the core, allowing protective relaying to detect it. The core ground may be brought out to a separate, external bushing or it may be connected internally, with cost being the driving factor as to its location. As it is with most investments, you get what you pay for.

Answer / mohd fazil

for the core to acquire charges to get into a potential which may cause insulation failure between the leads of the transformer to the core so the core is earthed in ...

Answer / kayode

In order to complete a circuit of flowing curent, cause curent is directly propotinal to power and inversely propotional to voltage

Difference of induction motor & servo motor ??

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How much weight an electrical engine can pull??

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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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Where servomechanism is used?

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if we increase frequency of line, then how will string efficiency varies with it.

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