处理小电流接地故障的新思路

A new way for treating with the single phase grounding fault in non-valid grounded systems

小电流接地故障是供配电系统中最常见的故障,对供电系统的安全可靠运行构成严重威胁。基于目前日趋完善的小电流接地选线技术和智能化的综合自动化系统及馈线自动化技术,提出了处理接地故障的新思路,即按照选线-跳闸-重合-隔离故障的方法处理小电流接地故障。另外,通过具体统计资料分析了重合闸技术在该类故障中应用的可行性,阐述了利用馈线自动化技术隔离故障的过程,认为该方法可以减小故障对系统的危害,并可以减少因故障造成停电的后果。

The single-phase-to-earth faults, which are the frequent faults, have much influence on the safety and stability of the running for the power feeder system. A new way about how to deal with the single-phase-to-earth faults is put forward, according to the development of the technology of line selection in neutral indirectly grounded system, intelligently integrated automation system and feeders automation system. That is, the single-phase-to-earth faults can be settled in the method of line selection-trip-reclose-isolation. In addition, other things are furtherly analyzed including the feasibility of auto-reclose technology in this kind of power system, the course about isolating faults by use of feeders automation technology and the advantage of this method, including reducing the hurt of system and the results of power cutting because of the faults.