Fault Location in Self-Healing Distribution Networks

Research on fault location in self-healing distribution system has been conducted for decades. However, a complete solution has not yet been found. This paper reviews the existed fault location methods in distribution system, except the SLG (Single-line-to-ground) fault in NUGS (Neutral un-effectively grounded system). The discussed faults in this paper are the short circuit faults which would cause large fault current and could be detected by over-current relay in substation. The principles and developments of several typical fault location methods are introduced in the paper. At last, possible improvements are proposed at the end of the paper. 