实用化的配电线路无通道保护方案

Practical Non-communication Protection for Distribution Feeders

针对单断路器分断的配电线路结构提出了一种新型无通道保护,该保护连同它的断路器既能开断电源端故障亦能开断无电源端故障。当短路故障发生后,无电源侧的保护和断路器根据无电源故障状态动作首先跳闸,有电源侧的断路器感受对端跳闸而加速动作;或者有电源侧的保护和断路器根据过电流保护原理首先动作,无电源侧保护和断路器实现加速动作跳闸,从而保证故障线路从两端快速、有选择性地切除。对于一个典型开环系统的仿真研究表明,所提出的保护方案是正确的,一个6段线路的系统最长保护动作时间不超过1.2 s。

This paper proposes a new non-communication protection scheme for distribution feeders separated by single circuit breakers. In this kind of configuration, the circuit breaker has to trip wherever the fault is from source side or from load side. After the fault occurs, the load side relay will operate firstly according to fault detection theory of load side. Then the source side relay and its associated circuit breaker will be accelerated to operate after detecting the trip of the opposite circuit breaker. On the other hand, after the source side relay firstly trips according to over current protection scheme, the load side relay can be accelerated too. As a result, the fault can be cleared from both sides more quickly and selectively. The simulation results with respect to a typical open ring system show that the new protection scheme is correct. The maximum operation time of a system with six lines is less than 1.2 s.