In the balanced three phase power measurement using two wattmeter method, each wattmeter reads 20 kW when the pf is unity. What does each wattmeter reads when the pf falls to (i) 0.6 lag and (ii) 0.573 lag. The total three-phase power remains unchanged.

In the balanced three phase power measurement using two wattmeter method, each wattmeter reads 20 kW when the pf is unity. What does each wattmeter reads when the pf falls to (i) 0.6 lag and (ii) 0.573 lag. The total three-phase power remains unchanged.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

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.

Question

In the balanced three phase power measurement using two wattmeter method, each wattmeter reads 20 kW,
when the pf is unity. What does each wattmeter reads when the pf falls to (i) 0.6 lag and (ii) 0.573 lag. The total
three-phase power remains unchanged.
(i) W1 at 0.6 lag
(i) W2 at 0.6 lag
(1) W1 at 0.573 lag
(i1) W2 at 0.573 lag
Windows buU
A 5000 V / 320 V, 50HZ single-phase transformer is to have an approximate e.m.f. per turn of 25 V and operate

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