Answer / m.bhuvaneswari

transformer copper loss is directly propotional to
current&iron loss is directly propotional to voltage. so
transformer rating is in kva.

Answer / boopathi

we can't find the correct powerfactor , this is depn upon
the loads thats why we are calling KVA..

Answer / j.kesavan

copper loss depending upon on current, iron loss depending
upon voltage thats why tr in kva not in kw

Answer / ashiah

In trafo we dont know what types of load connected at a
time.i.e. inductive or rasistive but in motor load is same.

Answer / sunil shelake

Cappacity(rating) of Transformer is always in KVA.If you
see the fomula of calculation of KW,you will get the answer
of this question. KW = VxIxPF/100 Power Factor can be vary
as it depends upon connected load.

Answer / livereason

Actually In transformer we cannot determine actual value of
the power factor. Power factor depends upon the load.
therefore we say the transformer rating in KVA.

Answer / baskaran.r

the rating kva or va is given because both are limited to
the given value,whatever be the power factor. if the ratings
are given in KW, at low powerfactor people will subject the
transformer to a higher currents and damage the transformer
hence the ratings are given in kva

How REF protects transformer alone? explain with diagram.

0 Answers  

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2 Answers   Power Grid,

can we use relay in fan?

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6 Answers  

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2 Answers  

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Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R

1 Answers  

how can we calculate that how much capacitor is needed for a system to increase the pf?

5 Answers  

In 3phase supply Voltage will come around 370v then what will happen?(mean what will effect on electrical equipment like AC,UPS,Motors.)

1 Answers   NTPC,