Answer Posted / mahesh sali

FOR 110 KW , SAY AT 0.8 PF.

WE KNOW THAT
KVA = KW/PF
KVA=110/0.8
KVA = 137.5 KVA
ASSUME THAT ABOVE LOAD IS MOTOR
FOR
AS PER NEC SAY THAT
25% EXTRA AS PER NORMS,
I=KVA/1.732*V ASSUME:- V-415 V
I=191.29 AMPS.

THEREFORE,
I = 1.25 * 191.29
I= 240 AMPS.
KVA= 1.732 *240*415
KVA=173 KVA , DEMAND LOAD
AS PER RULE
80% LOADING ON DG SET
KVA=173/0.8
KVA=216 KVA DG SET RATING
AS PER STD.RANGE OF DG SET -725 KVA AT 0.8 PF , 415 V
216

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