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

Short circuit voltage of a transformer mainly depend on A ohmic resistance of primary B ohmic resistance of secondary C magnitude of leakage flux D cross sectional area of core

1 Answers  

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0 Answers  

Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,

What is the disadvantage in proportional controller?

0 Answers  

Why cpaciter opposes sudden changes in voltage?and how?

1 Answers  

What is the unit of charge and current?

0 Answers  

what is the ohmic value of transformers

1 Answers  

what is XLPE cable?

2 Answers   Essar,

why the Parameters : Base Voltage & Maximum Voltage can't be equal in value in a VFD (Variable Frequency Drive) ? How much the base voltage would be lower than the maximum voltage ? If 400 V is the 3 phase output of a VFD ... then what should be the base voltage ? thanks a lot

1 Answers   Yaskawa,

why core of transformer in square or rectangular why not in circle or ellipse if this what happens

2 Answers  

what is power system transient condition

1 Answers  

what is relay type VDG,CDG,VTT ect?

1 Answers   Bhel,