A Method Of Detecting A Fault In A Transmission Line In An Ac Power Transmission System

Abstract: The present disclosure relatesd to a method of detecting a fault in a transmission line (101) in an alternating current, AC, power transmission system (100), the method comprising: - measuring, at a first measurement point of the transmission line, first phase voltages and first phase currents; - obtaining, for the transmission line from the first measurement point to a reach point at a distance from the first measurement point, a shunt factor, which comprises at least one of a shunt impedance and a shunt admittance, between the transmission line and ground; - estimating voltages and currents for the reach point on basis of a plurality of system parameters comprising the first phase voltages, the first phase currents, and the shunt factor; and determining whether a fault has occurred or not on basis of at least one of the estimated voltages and the estimated currents.

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