Single phase-to-ground fault line identification and section location method for non-effectively grounded distribution systems based on signal injection

Abstract

A diagnostic signal current trace detecting based single phase-to-ground fault line identification and section location method for non-effectively grounded distribution systems is presented in this paper. A special diagnostic signal current is injected into the fault distribution system, and then it is detected at the outlet terminals to identify the fault line and at the sectionalizing or branching point along the fault line to locate the fault section. The method has been put into application in actual distribution network and field experience shows that it can identify the fault line and locate the fault section correctly and effectively.