Wattmeter N Z. Z. Y B Fig. (a)

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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8. A wattmeter reads 5.54 kW when its current coil is connected in R phase and its
voltage coil connected between the neutral and the R phase of a symmetrical 3-phase
system supplying a balanced load of 30 A at 400 V. What will be the reading on the
instrument if the connections to the current coil remain unchanged and the voltage
coil be connected between B and Y phases? Take phase sequence RYB. Draw the
corresponding phasor diagram.
[Ans. 7.2 kW]
R.
Wattmeter
CC
R.
Z.
N.
Z.
Z.
Z.
Z.
Z.
Y
Y.
PC
Fig. (b)
Fig. (a)
Transcribed Image Text:8. A wattmeter reads 5.54 kW when its current coil is connected in R phase and its voltage coil connected between the neutral and the R phase of a symmetrical 3-phase system supplying a balanced load of 30 A at 400 V. What will be the reading on the instrument if the connections to the current coil remain unchanged and the voltage coil be connected between B and Y phases? Take phase sequence RYB. Draw the corresponding phasor diagram. [Ans. 7.2 kW] R. Wattmeter CC R. Z. N. Z. Z. Z. Z. Z. Y Y. PC Fig. (b) Fig. (a)
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