Answer / samir rana

cu lossof x mer depends on current and iron
loss on voltage total x mer loss depends on va and not on
phase angle between v and i it it is independent of load
power factor. that is why rating og x mers is in kva and
noy in kw.

Answer / mustakul

iron loss depends on voltage and copper loss depends on
current.so transformer rating is in KVA not in Kw

Answer / praneetha

cu loss of a transformer depends on current and iron loss
on voltage.hence total transformerloss depends on volt
ampere and not on phaseangle between them.it is independent
of p.f.that is why transformers is in KVAand not in KW.

Answer / mani0786

be coz consumer load is unknown simple

Answer / nachu

Only the voltage (V) or Current (A) is stepped up or down and there is no change in the power (W). Power in this case is reactive power not active power so it is mentioned as KVA.

Answer / ahamadkutty

A transformer is rated in VA or kVA because the kVA is the
vector sum of Active power IR and Reactive power
IX(l-c)which a transformer can be delivered. So depending on
the connected load with active and reactive component the
power kW will be varied keeping the kVA maximm at the rated
kVA of the transformer.For a fixed voltage the current
supplied by the transformer is the maximum fixed by the
formula VA/V and maximum power by the load.

Answer / rahul rajpal

Transformer is not a load....That why it's rated in KVA

Answer / osman mehmetukaj

because to remain constant power transformer
while only changing currents and tension in the primary and
the secondary opposite, for example: Ip X Up =Is x Us =S
S(=)kVA

hai every bodi please let me know the test procedure for lightning arresters.

2 Answers  

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  

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17 Answers  

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0 Answers  

from which formula we select a capacitor rating?

4 Answers   Suzlon,

How to design constatnt power source with variable current and Voltage.

2 Answers  

why we are connecting the alternator to a steam turbine of higher RPM then the rated RPM of alternator? For example:( connecting 1500 rpm alternator to 7600 rpm steam turbine). we can directly connect the same rpm turbine to alternator know??? is there any special reason ???

2 Answers  

What is the use of starter in tube light fitting.how it works.

3 Answers   JSW,

why do you add the load short circuit impedance when considering short circuit amperage. It seems that you should only consider supply. If you need to consider loads and you don't know what loads are to be added , what would be a good sub-transient reactance rating for the loads?

0 Answers  

What is the usega of brking resistor? and how it will useful to Drive...?

3 Answers  

Resistance of a conductor in a close electrical ckt is practically zero why?

1 Answers  

I AM INTERESTED TO WIND A 3 PHASE MOTOR HOW I CALCULATE TURNS, PITCH,AND WIRE SIZE FROM STATOR DIMENTIONS

0 Answers