Consider a simple positive phase sequence, three-phase, three-wire system operated at 50 Hz and with a balanced loa Each phase voltage of 240 V is connected across a load composed of a series-connected 80.00 and 500 mH combination. Please report your answer, so the magnitude is positive, and all angles are in the range of negative 360 degrees to positive 360 degrees. Calculate the total power supplied by the three-phase source. (Round the final answer to three decimal places.) W. The total power supplied by the three-phase source is

Q: What would be the same results of this quesiton if the circuit was single phase 1000v?

A: If True power is single phase i.e.,P1ϕ=10kWV1ϕ=1000VI1ϕ=12.33 A

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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.