What is the difference Marshaling box and RTCC (Relay tap changer circuit) Panel of transformer ?

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how to estimate wiring ins roughing ins. and boxes

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what is meant by trip circuit supervision & directional or non directional over current ?

1 Answers   ABB,

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there are 3 transformers each of 1500 kva and one transformer of 1000kva for a 11 floor building . total otgoing kw is 4066 kw. i need an extra 260 kw .is there any provision for that? what is the max kw that can be connected with these transformers?

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What is the control action?

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what are types of encoder

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will the power consumption remains the same when speed of the fan cnanges??if so y??

2 Answers  

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What will happen if power transformer designed for 50 Hz is connected to 500 Hz of the same voltage , and vice versa ?

1 Answers  

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In view of Electrical Engg. What is the use of SCR(Silicon control rectifier)

2 Answers  

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Why we are not using capacitor in line when load on Genset?

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Why don't we use ground free electricity to avoid electric shock.As birds are do not get shock.

3 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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