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The positive, negative and zero sequence impedances of a three-phase generator are Z1, Z2 and Z0 respectively. For a line-to-line fault with fault impedance Zf, the fault current is If1 = kIf, where If is the fault current with zero fault impedance. The relation between Zf and k is
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The positive, negative and zero sequence impedances of a three-phase g...
In line to line fault,
fault current with fault impedance zf is

fault current with zero fault impedance is,


⇒ z1 + z2 = k (z1 + z2 + zf)
⇒ z1 + z2 - k z1 - k z2 = k zf 
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Community Answer
The positive, negative and zero sequence impedances of a three-phase g...
In line to line fault,
fault current with fault impedance zf is

fault current with zero fault impedance is,


⇒ z1 + z2 = k (z1 + z2 + zf)
⇒ z1 + z2 - k z1 - k z2 = k zf 
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The positive, negative and zero sequence impedances of a three-phase generator are Z1, Z2 and Z0 respectively. For a line-to-line fault with fault impedance Zf, the fault current is If1 = kIf, where If is the fault current with zero fault impedance. The relation between Zf and k isa)b)c)d)Correct answer is option 'A'. Can you explain this answer?
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