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how to calculate knee point voltage of current transformer?
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Answer Posted / lakshmikanthan
V(kp) = 2 * IF(A) * (RCT(Ω) + RL(Ω) + RB(Ω)) / CT
If= fault current
Rct= resistance of CT winding secondary
Rl= lead resistance
Rb= relay resistance for measuring terminal
CT= ct ratio
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