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how to calculate knee point voltage of current transformer?
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Answer Posted / arvind negi
Calculation:
1) Fault Current at Primary Side of CT (kA) = MVA/*100(%
Z*1.732*KLV) 7.55
2) Fault Current at Secondary Side of CT, If (A)=
6.29
3) Cable Lead Resistance, RL (Ohm)= 1.02
4) Knee Point Voltage Vk (Volt) = 2If(RCT+2RL)
101.2
REMARKS : -
Knee Point Voltage of CT provided by CGL for REF CT = 115V
and for Differental CT = 200V are in order.
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