A three-phase uncontrolled bridge rectifier delivers power to a resistive load of 1092.
The output voltage of the rectifier is 400 V DC. The rating of source side of three phase
delta - star transformer is,
(a) 14.875 kVA
(b) 16.765 kVA
(C) 15.475 kVA
(d) 16.025 kVA
Answer
OA
OB
Ос
OD
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Answer:
The output d.c.voltage is = 400V
The resistive load is = 10 ohms
The output power drawn by the resistive load = ( 400 x 400 ) / 10 ( note : Power = Voltage square / load resistance )
The power output therefore is = 16000 or 16 kW .
The A.C. power required to deliver 16 kW of load will be ( 16 000 / 0.7/0.8 ) = 28.6 kVA or rounded to 30 kVA
note the figures, .8 refers to the power factor on the a.c side of the Transformer and / Rectifier and .7 refers to the efficiency .
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