GATE EE 2022 Set 1 — Question 15
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Power Systems → Fault Analysis → Symmetrical Components
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Question
The valid positive, negative and zero sequence impedances (in p.u.), respectively, for a 220 kV, fully transposed three-phase transmission line, from the given choices are
Correct answer
(B) 0.15, 0.15 and 0.35
Solution
For a static, balanced, and fully transposed transmission line:
(A) (Invalid)
(B) and (Valid)
(C) (Not typical for transmission lines)
(D) (Invalid for static lines)
1.The positive sequence impedance () is equal to the negative sequence impedance () because the line is a static device ().
2.The zero sequence impedance () is significantly higher than the positive sequence impedance () due to the ground return path and mutual coupling between phases. Typically, is 2 to 3.5 times .
Evaluating the options:(A) (Invalid)
(B) and (Valid)
(C) (Not typical for transmission lines)
(D) (Invalid for static lines)
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