Arrange a simple three-phase system in your workplace and measure the power consumed by the load. You may use wattmeter or any other digital meter, while measuring three-phase power. The connection diagram is shown in Figure 3. Your report should show details of the three-phase load and connection diagram relating to the power you have measured. This work should be evidenced by photograph in the report. W₁ IR SS R Y ww W₂ ww IB eyn Z₂ Z₁ eRN 23 B Figure 3: Three phase system with wattmeter connection. eBN

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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.