Single-phase broken-line fault of a 10 kV ungrounded distribution Line

Abstract

In recent years, a great many applications of overhead insulated lines in distribution networks have reduced the occurrence of single-phase ground faults, and at the same time made broken-line faults a problem that cannot be ignored. Timely fault detection and fault location are of great help to reduce power outages and improve the quality of power supply for users. Aiming at the ungrounded system, this article designs a single-phase broken-line model, considers the influence of abort situation and others, analyses the fault characteristics such as sequence current and neutral point offset voltage, and then advances a fault model according to negative sequence current and neutral point offset voltage fault detection method. Lastly, the validity of the suggested way is confirmed by MTALAB.