why rating in KVA and KVAR?
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Answer / sunil ulange
ALL TRANSFORMERS RATING ARE IN KVA BECAUSE TRANSFORMER IS
INDEPENDENT OF POWER FACTOR AND TRANSFORMER WILL NOT ACT AS
A LOAD, IT ONLY TRANSFERS VOLTAGE FROM ONE LEVEL TO OTHER LEVEL.
KVA = KILO( VOLTS * AMPERES )
NORMALLY REACTORS RATINGS ARE IN KVAR
Is This Answer Correct ? | 20 Yes | 3 No |
Transformer reating is always in KVA because the losses of
T/F are depending upon voltage & current ,not on the phase
angle so that T/F rating is in KVA not in KVAR
( This topic u can study in the book Electical Enng Part 2
by B L Tereja.)
Is This Answer Correct ? | 8 Yes | 2 No |
Answer / nag
TRANSFORMERS ARE RATINGS ARE IN KVA.WHY BECAUSE CORE LOSSES
DEPENDING ON VOLTAGE AND COPPER LOSSES ARE DEPENDED ON
CURRENT.SO,TRANSFORMER DEPENDING ON VOLTAGE AND
CURRENT .THATS WHY TRANSFORMER RATING IN KVA.
REACTIVE POWER IS RATING IN KVAR .
Is This Answer Correct ? | 6 Yes | 0 No |
Answer / rijwan
someone has written that transformer losses depend on voltage as well as current that's why the rating is in KVA.
In case of motor also cu loss and iron loss depend on current and voltage respectively. Then the rating of motor why not in KVA ??
In case of x-mer we simply dont know the power factor as it operates at different power factor with time.
That's why the rating of x-mer is in KVA, not in KW.
Is This Answer Correct ? | 0 Yes | 0 No |
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Dear Sirs, I am a technical persons.In one of our Electrical Sub- Station, We have installed three numbers of 1250KVA ,11KV/0.415KV Transformer to feed the Factory load. We have found some abnormality. In one of our Transformers the leakeage current from transformer body to earth through earth continuity wire is almost 86 Amp but in other transformer it is (5-10)Amp. where the load current on three phase and neutral are respectively 1360Amp,1400Amp,1370 Amp & 176Amp. So please any technical person help me about the reasons of this situation and how I can rectify the fault. Moreover,I have measured the earth resistance of the Earth continuity wire which is less than 1 Ohm. Thanks Tapas Barua