判断隔离铁路自闭、贯通电力线路短路故障的方法

Approach to detection and isolation of short-circuit fault for railwayself-closing and run-through power lines

阐述了铁路10kV自闭、贯通电力线路的运行方式和特点,提出了一种用时标分组判断隔离铁路自闭、贯通电力线路短路故障的新方法。将故障电流转换成带时标的遥信信号上传,通过综合考虑故障点前后高压负荷开关流过电流及其在自闭、贯通电力线路的位置,主站对带时标的信号分组以判断线路短路故障区段。利用程序控制故障点两端远动负荷开关进行分闸操作,对相邻配电所相关断路器进行合闸操作,以达到自动隔离故障的目的。实例表明可在90s之内自动隔离故障区段并恢复供电。

According to the operation modes and features of railway 10 kV self-closing and run-through power lines, an approach to the detection and isolation of short-circuit fault for them is brought forward by using time-tag grouping. The fault currents are transformed into remote signals with time-tag and transferred upward,synthetically considering the currents passing through HV load switches before and after fault together with their locations in self-closing or run-through power line,master station groups the signals with time-tag to detect the short-circuit fault section. Programs are developed to isolate fault point automatically by remote switching off the load switches at both sides of fault point and switching on the correlative breaker in neighboring distribution station. Instance shows that the fault area can be isolated and restored power supply within 90 s.