The load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are 15 A and the kVA ratings and input power are 15KVA and 8kW respectively. (a) Find the line and phase voltage. (b) If the coils are now connected in delta to the same three-phase supply, calculate the line current and phase current.

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
Chapter2: Fundamentals
Section: Chapter Questions
Problem 2.48P
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O two
The load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are
15 A and the kVA ratings and input power are 15KVA and 8kW respectively.
(a) Find the line and phase voltage.
(b) If the coils are now connected in delta to the same three-phase supply, calculate the line current and phase
current.
The input power of a three-phase motor is measured by two wattmeter method. If the readings were 12.9KW
and -6.1KW then the reactive power is
Chp
ts
f7
fg
19
f10
10
&
7
5
8
7.
V
Transcribed Image Text:O two The load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are 15 A and the kVA ratings and input power are 15KVA and 8kW respectively. (a) Find the line and phase voltage. (b) If the coils are now connected in delta to the same three-phase supply, calculate the line current and phase current. The input power of a three-phase motor is measured by two wattmeter method. If the readings were 12.9KW and -6.1KW then the reactive power is Chp ts f7 fg 19 f10 10 & 7 5 8 7. V
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