Abstract:

In distribution network fault location,the existence of the cement pole earth fault and the effect of wire distribution capacitance make it difficult to locate by the C type traveling wave method and the AC signal injection method.DC signal injection method works in time of line power failure,by which a DC signal is injected into the fault for the maintenance personnel to detect the DC signal by holding a DC signal detector along the road to determine the specific location of the point of failure.The principle of the DC signal detector and composition are described,and the injection of the DC signal is simulated.Simulation results prove the feasibility of our method.

Key words: distribution network;fault location;DC signal injection method;DC location method