摘要
特高压串补线路故障时流经断路器的短路电流可能出现延时过零现象,给断路器的成功开断造成困难。依据中国1 000 k V同塔双回线路的典型参数,仿真分析了该现象的产生机制。双回线路中,故障回路串补保护装置MOV动作引起短路电流中的周期分量经非故障回路分流,是造成流经串补装置远端的断路器中短路电流过零延时的主要原因。就影响该现象的因素如故障类型、故障点位置、线路长度、串补布置方式以及串补度进行了探讨。根据仿真结果,建议采取串补分散布置和提高断路器开断性能来解决该问题,不建议特高压交流断路器加装分闸电阻。
The delayed current-zero crossing of short circuits current can happen in UHV systems with series-compensation when fault occurs and can create difficulties to the circuit breakers to interrupt. This paper analyzed the mechanism of the above phenomenon based on the typical parameters of 1 000 kV double circuit transmission line in China. The key reason for the delayed current-zero crossing of current passing through the circuit breaker which is far away from the series compensation is that the bypass flowing of periodic content of fault current through non-fault line which caused by the action of MOV in the series compensation. The factors that influenced the delayed current-zero crossing have been studied, such as fault type, fault location, line length, series compensator arrangement and series compensation degree. According to the simulation results, it is recommended to take the dispersed arrangement of series compensation and improve the capacity of circuit breaker to solve this problem, opposed to apply opening resistances on the circuit breaker in UHV line with series-compensation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第11期2879-2886,共8页
Proceedings of the CSEE
关键词
特高压
串联补偿
短路电流
延时过零
UHV
series compensation
short-circuitcurrent
delayed current-zero crossing
