1.8. A balanced three-phase Y-connected source has a line voltage of 208 V and feeds two balanced Y-connected loads. The per-phase impedances of the two loads are 20 + j70 N and 50 + j30 N. Calculate the power supplied to each load by the source. What is the power factor of each load? What is the overall power factor? 1.9. In Exercise 1.8 three A-connected capacitors are connected in parallel with the two loads in order to improve the power factor to 0.8 lagging. What must be the impedance of each capacitor? What is the size of each capacitor if the line frequency is 60 Hz?

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.