CAJ | 학술논문

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 kV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.
특고압천보선로고장시류경단로기적단로전류가능출현연시과령현상,급단로기적성공개단조성곤난.의거중국1 000 kV동탑쌍회선로적전형삼수,방진분석료해현상적산생궤제.쌍회선로중,고장회로천보보호장치MOV동작인기단로전류중적주기분량경비고장회로분류,시조성류경천보장치원단적단로기중단로전류과령연시적주요원인.취영향해현상적인소여고장류형、고장점위치、선로장도、천보포치방식이급천보도진행료탐토.근거방진결과,건의채취천보분산포치화제고단로기개단성능래해결해문제,불건의특고압교류단로기가장분갑전조.
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 1000kV 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.