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A three-phase 240-V rms circuit has a balanced Y-load impedance Z. Two wattmeters are
Chapter 12, Problem DP12-2(choose chapter or problem)
A three-phase 240-V rms circuit has a balanced Y-load impedance Z. Two wattmeters are connected with current coils in lines A and C. The wattmeter in line A reads 1440 W, and the wattmeter in line C reads zero. Determine the value of the impedance.
Questions & Answers
QUESTION:
A three-phase 240-V rms circuit has a balanced Y-load impedance Z. Two wattmeters are connected with current coils in lines A and C. The wattmeter in line A reads 1440 W, and the wattmeter in line C reads zero. Determine the value of the impedance.
ANSWER:Step 1 of 3:
The power delivered at phase A is calculated by the shown equation,
Subsequently, the power delivered at phase C is calculated by the shown equation,
Then,
Substituting (2) in(1),