Example 1: The power supplied to a balanced Y-connected load is measured by the two- wattmeter method. Determine the power reading for each meter if each load is 47 <45°, and the line voltage is 122 V. 47.4w 176.8 Example IA A VBC VCA W₂ W₁ mi IB. Ic. IN VXN Z VYN IXN VZN IZN Z

Example 1: The power supplied to a balanced Y-connected load is measured by the two- wattmeter method. Determine the power reading for each meter if each load is 47 <45°, and the line voltage is 122 V. 47.4w 176.8 Example IA A VBC VCA W₂ W₁ mi IB. Ic. IN VXN Z VYN IXN VZN IZN Z

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.28P: For the system shown in Figure 3.34. draw an impedance diagram in per unit by choosing 100 kVA to be...

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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

Example 1:
The power supplied to a balanced Y-connected load is measured by the two-
wattmeter method. Determine the power reading for each meter if each load is
47 2 <45°, and the line voltage is 122 V. 47. Yu
176.8
Example
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A
VAB
B
VBC
VCA
W₂
W₁5
m
3.1
IVN
VXN
VYN
1XN
VZN
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IZN
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