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A 3φ transposed transmission line has self impedance of j20 Ω and mutual impedance of j8 Ω. Its zero sequence impedance and positive sequence impedance respectively, are___________
  • a)
    j12, j28                   
  • b)
    j12, j36
  • c)
    j36, i 12                  
  • d)
    j28, j12
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A 3 transposed transmission line has self impedance of j20 and mutual...
To calculate the zero sequence impedance and positive sequence impedance of a 3 transposed transmission line, we need to consider the self impedance and mutual impedance.

1. Self Impedance:
The self impedance of the transmission line is given as j20. This represents the impedance of each phase of the line when the other two phases are short-circuited. It is the impedance seen by a fault or an unbalanced condition in the line.

2. Mutual Impedance:
The mutual impedance of the transmission line is given as j8. This represents the impedance between any two phases of the line when the third phase is short-circuited. It is the impedance seen by a fault or unbalanced condition between two phases.

3. Zero Sequence Impedance:
The zero sequence impedance represents the impedance seen by a zero sequence current flowing in the transmission line. Since the zero sequence current flows in all three phases in the same direction, it experiences the sum of the self impedances and the mutual impedance. In this case, the zero sequence impedance is given as j36.

4. Positive Sequence Impedance:
The positive sequence impedance represents the impedance seen by a positive sequence current flowing in the transmission line. The positive sequence current flows in all three phases in the same direction and experiences the self impedances and the mutual impedance. In this case, the positive sequence impedance is given as j12.

Therefore, the correct answer is option 'C': j36 for zero sequence impedance and j12 for positive sequence impedance.
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A 3 transposed transmission line has self impedance of j20 and mutual impedance of j8 . Its zero sequence impedance and positive sequence impedance respectively, are___________a)j12, j28b)j12, j36c)j36, i 12d)j28, j12Correct answer is option 'C'. Can you explain this answer?
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