In an Industry, three phase power measurement is carried out, using two wattmeter method, each wattmeter reads 8 kW, when the pf is unity. What does each wattmeter reads when the pf falls to (1) 0.707 lag and (ii) 0.906 lag. The total three-phase power remains unchanged.

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A: The solution can be achieved as follows.

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A: Option - b ( Answer )

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Q: A WWhat is the of 20 e'v phase Voltage each phase Voltage and the Line Voltagte? 240420v C B

A:

Q: reactive power calculation.

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Q: 170% ZAN = 19.6 j6 2 Ziine = 0.1 0.2)n ZA = 60+ /6 2 Van(wgk/rms) = 22020° V ZAN Za ZCN Zne Zine

A: As the given circuit is balanced,we can do the calculation on per phase basis. The Phase a circuit…

Q: A three phase alternator has 48 slots and 4 pole. Find its distribution factor. A)0.9717 B)0.2298…

A: Given: Phase (m)=3 slots (s)=48 number of poles (P)=4

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.