MULTI-ENDED FAULT LOCATION SYSTEM

摘要

In a fault location system, selected information concerning the power signal is obtained at each terminal location on a multi-ended power line. Typically, protective relays are positioned at the terminal locations. The selected information includes the magnitude value of the negative sequence current and the magnitude and angle of the negative sequence impedance of the power signal, at approximately mid-fault in time. Automatic means are provided for calculating from the negative sequence values a fractional value m of the total line length representing the point on the line where the fault has occurred, and means for calculating the distance to the fault from the fault location calculation terminal using the value m and the total distance between the two terminals.