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The valid poistive, negative and zero sequence impedances (in p.u.), respectively, for a 220 kV, fully transposed three-phase transmission line, from the given choices are
  • a)
    1.1, 0.15 and 0.08
  • b)
    0.15, 0.15 and 0.35
  • c)
    0.2, 0.2 and 0.2
  • d)
    0.1, 0.3 and 0.1
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The valid poistive, negative and zero sequence impedances (in p.u.), r...
For 3-φ full transferred transmission line,
X1 ≌ X1 < X0
So suitable answer from given options is option (b).
X1 = X2 = 0.15 
X0 = 0.35
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Community Answer
The valid poistive, negative and zero sequence impedances (in p.u.), r...
Given:
- Transmission line: fully transposed three-phase transmission line
- Voltage: 220 kV

To find:
- Valid positive, negative, and zero sequence impedances in p.u.

Solution:

Positive, negative, and zero sequence impedances are determined based on the line parameters. In a fully transposed transmission line, the positive, negative, and zero sequence impedances are the same.

Step 1: Convert the voltage to per unit (p.u.):
The per unit voltage is calculated by dividing the actual voltage by the base voltage. The base voltage is chosen as the line voltage, which is 220 kV in this case. Let's assume the base voltage (Vbase) as 220 kV.

Per unit voltage (puV) = Actual voltage (V) / Base voltage (Vbase)

puV = 220 kV / 220 kV = 1 p.u.

Step 2: Determine the positive, negative, and zero sequence impedances:
Since the positive, negative, and zero sequence impedances are the same for a fully transposed transmission line, we only need to find one of them.

The given choices are:
a) 1.1, 0.15, and 0.08
b) 0.15, 0.15, and 0.35
c) 0.2, 0.2, and 0.2
d) 0.1, 0.3, and 0.1

We can see that option 'b' has the same value for positive, negative, and zero sequence impedances, which satisfies the condition for a fully transposed transmission line.

Therefore, the valid positive, negative, and zero sequence impedances in per unit (p.u.) for the given transmission line are 0.15, 0.15, and 0.35, respectively.

Answer: Option 'B'
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The valid poistive, negative and zero sequence impedances (in p.u.), respectively, for a 220 kV, fully transposed three-phase transmission line, from the given choices area)1.1, 0.15 and 0.08b)0.15, 0.15 and 0.35c)0.2, 0.2 and 0.2d)0.1, 0.3 and 0.1Correct answer is option 'B'. Can you explain this answer?
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