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CT requirement
The CT knee point voltage Vk is required as follows:
The CT should not be saturated by maximum through fault current.
Vk (RCT + R1 + Vb/n
Ifm:
Maximum through fault current
N:
CT ratio
RCT:
CT secondary resistance
R1:
CT cable resistance
Vb:
Relay burden
n:
CT secondary rating
2
) Ifm/N
210
6 F 2 S 0 7 8 9
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