4. Given 1. three single-phase loads with the same impedance and each requires 208V voltage supply and 2. three balanced single-phase sources that each supplies 120V voltage Design a three-phase system in which the three balanced sources can supply 208V to each of the three loads. a. Specify how the three balanced sources should be connected b. Specify how the three loads should be connected C. Draw the connection between the sources and loads d. Label all the phase and line voltages and currents in the three-phase system

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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.