Electric Circuit Analysis: Unit IV: Three phase circuits

Additional solved problems

Three phase circuits | Electric Circuit Analysis

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Electric Circuit Analysis: Unit IV: Three phase circuits : Additional solved problems

ADDITIONAL SOLVED PROBLEMS

1. A 3-phase, 440 V supply feeds an unbalanced, delta connected load in which ZRY-20/30°, ZYB = 2020° Q, ZBR = 20-30° Q. Phase sequence is RYB. Determine the readings of two wattmeters which are placed in R and Y lines for measurement of 3 phase power.

Solution:


The phase currents can be expressed in the polar form as below.


Now, the line currents IR, IY and IB are calculated by applying KCL as shown below.


Answers:

IR = 39.2 ∠ -48.4° A

IY = 15.17 ∠ -127.7° A

IB = 44.6 ∠ 112° A

 

Electric Circuit Analysis: Unit IV: Three phase circuits : Tag: : Three phase circuits | Electric Circuit Analysis - Additional solved problems

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