GATE EE 2021 Set 1 — Question 46
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Power Systems → Fault Analysis → Symmetrical Components
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Question
Suppose and are a set of unbalanced current phasors in a three-phase system. The phase-B zero-sequence current p.u. If phase-A current p.u and phase-C current p.u, then in p.u is
Correct answer
(D) 1 -120^ + 0.1 0^
Solution
In symmetrical components, the zero-sequence currents for all three phases are equal:The zero-sequence component is defined as:Given and :Now check the options:
Option (D): .
This matches the calculated value of . Therefore, the correct option is (D).
Option (D): .
This matches the calculated value of . Therefore, the correct option is (D).
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