Answer / m raviteja

capacitor is static device which can store the energy in
the form of eletric field, Q=CV. We can switch on and off
the capacitor bank depends on the load. Normally capacitors
in the industries are dependent on power factor.
from power equation p=1.732vicosphi.

Answer / guest

normally the capacitors are switched on to bring the power factor nearer to unity i.e 1.
if load(kw)is almost equal to generator capacity (kva)or if power factor is between 0.9 to 1 we wont Switch on the capacitors.
capacitors are rated in kvar(kilo volt amp reactive )
apparent power=kvar=sqrt(3)*V*I*sin phi

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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