基于断路器支路故障电流的短路电流评估方法  

A short circuit current evaluation method based on the branch fault current of the circuit breaker

作　　者：董炜 华文 申屠磊璇 周靖皓 王龙飞 王博文 DONG Wei;HUA Wen;SHENTU Leixuan;ZHOU Jinghao;WANG Longfei;WANG Bowen(State Grid Zhejiang Electric Power Co.,Ltd.Research Institute,Hangzhou 310014,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China)

机构地区：[1]国网浙江省电力有限公司电力科学研究院,杭州310014 [2]国网浙江省电力有限公司,杭州310007

出　　处：《浙江电力》2023年第2期26-34,共9页Zhejiang Electric Power

基　　金：国家电网有限公司科技资助项目(5211NB21005P)。

摘　　要：随着负荷快速增长,电网密度不断提升,短路电流超标问题日益严重,精确评估系统短路电流水平对保障电网的安全稳定运行至关重要。对此,提出一种基于断路器支路故障电流的短路电流评估方法。针对220 kV及以下电压等级双母双分段接线变电站和500 kV 3/2接线变电站,分析不同故障位置、断路器拉停等情况下流过断路器的短路电流,并提出线路出口单相故障单跳单重阶段断路器所需遮断短路电流的计算方法,明确了变电站内断路器所需遮断最大短路电流,将短路电流校核标准精准化到故障后流过各断路器的最大短路电流不超过其遮断能力。最后通过算例分析验证了所提评估方法的有效性。With the rapid load growth and the increasing density of power grids, the overrun short-circuit current becomes increasingly aggravated. To accurately assess the short-circuit current level of the system is crucial to ensure the safe and stable operation of the power grid. Therefore, a short-circuit current evaluation method based on the branch fault current of the circuit breaker is proposed. In view of the double-bus double-section wiring substations at voltage levels of 220 kV and below and 500 kV three-to-two wire substations, the paper analyzes the short circuit current flowing through the circuit breaker in case of different fault locations, switch-off of circuit breakers, etc.Moreover, it proposes a calculation method of the short circuit current that the circuit breaker requires in the singlejump single-weight stage of single-phase fault occurring at the line outlet and determines the maximum short circuit current required to block the circuit breaker in the substation. Additionally, it specifies a short circuit current calibration standard that the maximum short circuit current flowing through the circuit breakers after the fault should not exceed their breaking capacities. Finally, the effectiveness of the proposed evaluation method is verified through case analysis.

关 键 词：短路电流 断路器支路 双母双分段接线 3/2接线 单相重合闸 

分 类 号：TM713[电气工程—电力系统及自动化] TM561