基于电压-时间型重合器的配电网单相接地故障自动隔离技术研究

Technology research of fault automatic isolation in distributed single-phase-to-ground based on voltage-time type recloser

提出了利用选线装置与电压-时间型线路重合器相配合,实现单相接地故障自动隔离与非故障区段自动恢复供电的新技术。讨论了选线装置与电压-时间型线路重合器的配合工作方式,通过第一次重合闸确定故障区段,通过第二次重合闸隔离故障区段。该技术能够快速选出故障线路并隔离该故障区段,有利于故障快速消除,提高系统运行的安全性、可靠性,同时为快速准确的故障定位创造条件。现场的实际运行充分验证了该技术的正确性与可行性。

A new method is presented by combining fault line detection and automatic recloser to achieve single-phase grounding fault insulation and resume non-fault section automatically. This paper discusses conjunctive mode between fault line detection and automatic recloser, i.e. through recloser determining fault section firstly, and isolating fault section secondly. The method can select fault line and isolate fault section quickly. The method is beneficial to clear faults quickly, improve the security and reliability in the run, and also create condition of quick and exact fault location. Practical local operation verifies the correctness and feasibility of this method fully.