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Pilot wire impedance

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Cerkit

Cerkit

Electrical
Joined
Jan 18, 2016
Messages
100
Location
GB
Hi,

I am calculating the voltage and current flowing in pilot wires in a voltage balance protection system. The literature I am reading says that for an external fault the impedance seen is half the open circuit impedance of the pilots. Does this mean that no current flows for an external fault?
 
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Voltage_Balanced_Differential_Protection_ebmvhe.jpg
 
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