Answer Posted / pillay
Any AC electrical equipment that has conductors have to be rated in voltage and amps, so it is KVA if more than thousand. WHY.
SIMPLE . If more than the designed amps flows through the equipment it will over heat and burn.(destroyed)
IF a 500 kw transformer is loaded at 415 v at unity pf to the max it will carry 500000/415x1.732 = 695 amps
if the same transformer is loaded at 500kw at 415 v but at 0.5 pf it will carry 500000/415x1.732x0.5 = 1391 amps
can the transformer winding take this amount of current.You see on both occasions the load was 500 kw but the pf was different and the amps was double.What will happen if the transformer is loaded at a further lower pf. should the transformer be still rated as 500kw
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