81 PART B Answer All the Questions Two wattmeters are connected to measure power input to a three phase balanced circuit

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81 Part B Answer All The Questions Two Wattmeters Are Connected To Measure Power Input To A Three Phase Balanced Circuit 1 (22.64 KiB) Viewed 17 times

81 PART B Answer All the Questions Two wattmeters are connected to measure power input to a three phase balanced circuit indicate 7 KW and 0.7 kW; the later reading being obtained after reversing the current coll connection. Find (i)pf of load, (ii) active power, (iii) reactive power and (iv) apparent power. EEPW2251: Electrical Power Technology Page 4 of 10 (ii) 1+1+1+1=4 Marks 82 In a single-phase 25kVA, 2000/200 V transformer, the iron and full load copper losses are 350W and 400W respectively. Calculate the efficiency at unity power factor at (i) full load and half load. 12+2-4 Marks