RIPPLE CONTROL SIGNAL USING FOR EARTH FAULT LOCATION IN MV NETWORKS

Petr Toman - Jaroslava Orságová

   At present, digital protections using the admittance principle are able to identify quite reliably a single phase-to-ground connection and to determine the affected feeder. Still, the location of the fault presents a task yet to be solved. The main problem of a fault location consists is a low value of the fault current during a single phase-to-ground fault in compensated networks. This work started of an experiment performed in the second half of 2001. The experiment explored the possibility of identifying the fault location in a circular network by means of ripple-control signal. The work deals with a novel method for fault location that is able to determine the distance of a fault in a radial network (without possibility of circular interconnection) using only values measured in a switching station. The principle of this method was published in 2000 [1]. It presents the application of the method in a real distribution network and the evaluation of the results of this experiment.

Keywords: single phase-to-earth faults, compensated network, location of faults, ripple-control signal

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