采用220 kV快速开关的柔性短路电流抑制技术与工程实践  

Flexible Short-Circuit Current Suppression Technology Based on 220 kV Fast Switch and the Engineering Practice

作　　者：杨勇 张弛 徐华 邵先军 戚宣威 金涌涛 何坚 YANG Yong;ZHANG Chi;XU Hua;Shao Xianjun;QI Xuanwei;JIN Yongtao;HE Jian(State Gird Zhejiang Electric Power 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》2021年第4期82-88,共7页Zhejiang Electric Power

基　　金：国家电网有限公司科技项目(5211DS20004M)。

摘　　要：世界首套采用柔性短路电流抑制技术的220 kV SF6快速开关在浙江电网实现商业化应用。鉴于此,阐述了柔性短路电流抑制技术的基本原理、快速开关基本工作原理和短路故障快速识别技术。提出了快速开关与常规开关的时序配合及动作策略,分析了快速开关不同安装位置对故障点短路电流的抑制效果。为验证所提动作时序及控制策略的有效性,进行了220 kV线路单相人工短路试验。试验结果表明:当220 kV线路发生单相短路故障时,快速开关20.1 ms内实现系统解列,有效降低了短路电流水平。研究结果为有效开展短路电流抑制和550 kV快速开关的研制提供了重要参考。The world's first 220 kV SF6 fast switch based on flexible short-circuit current suppression technology was put into commercial operation in Zhejiang power grid.The basic principle of flexible short-circuit current suppression technology,the basic working principle of the fast switch and the fast short-circuit fault identification technology are expounded.Then,sequential coordination and action strategy of the fast switch and the conventional switch are put forward,and the suppression effect of the fast switch on the short-circuit current at the fault point in different installation positions is analyzed.To verify the effectiveness of the proposed action timing and control strategy,the single-phase artificial short-circuit test of 220 kV transmission line was carried out.The test results show that when a single-phase short-circuit fault occurs in a 220 kV transmission line,the quick switch can realize the system splitting within 20.1 milliseconds,which effectively reduces the short-circuit current level.The research results provide an important reference for effectively suppressing short-circuit current and developing a 550 kV fast switch.

关 键 词：短路电流 快速开关 系统解列 保护动作 燃弧时间 

分 类 号：TM561[电气工程—电器]