文章摘要
吕玮,刘云飞,周启文,等.多断口快速开关型高压故障限流器[J].电力系统自动化,2019,43(23):234-239. DOI: 10.7500/AEPS20190415005.
LUY Wei,LIU Yunfei,ZHOU Qiwen, et al.Fast-switching High Voltage Fault Current Limiter with Multiple Breakers[J].Automation of Electric Power Systems,2019,43(23):234-239. DOI: 10.7500/AEPS20190415005.
多断口快速开关型高压故障限流器
Fast-switching High Voltage Fault Current Limiter with Multiple Breakers
DOI:10.7500/AEPS20190415005
关键词: 故障限流器  多断口串联  快速开关  电磁斥力机构  有限元仿真  均压
KeyWords: fault current limiter  multiple breakers in series  fast-switching  electromagnetic repulsion mechanism  finite element simulation  voltage sharing
上网日期:2019-09-06
基金项目:国家重点研发计划资助项目(2017YFB0903100);国家电网公司科技项目(521104170043);已申请国家发明专利(申请号:201811242966.0)
作者单位E-mail
吕玮 南京南瑞继保电气有限公司, 江苏省南京市 211102 lvw@nrec.com 
刘云飞 南京南瑞继保电气有限公司, 江苏省南京市 211102  
周启文 南京南瑞继保电气有限公司, 江苏省南京市 211102  
方太勋 南京南瑞继保电气有限公司, 江苏省南京市 211102
南瑞集团有限公司(国网电力科学研究院有限公司), 江苏省南京市 211106 
 
王智勇 常州博瑞电力自动化设备有限公司, 江苏省常州市 213025  
张广泰 南京南瑞继保电气有限公司, 江苏省南京市 211102
常州博瑞电力自动化设备有限公司, 江苏省常州市 213025 
 
摘要:
      随着电网容量不断发展,局部地区电网短路电流过高,严重威胁系统稳定、安全运行。文中提出了一种多断口串联的高压快速开关型故障限流器,通过隔离变压器将操作机构与断口等电位,采用“一拖二”式电磁斥力机构,取消了绝缘拉杆,既实现了快速分合闸,也解决了故障限流器采用电容式电压互感器供能时系统不带电情况下无法分合闸的问题。另外,通过三维有限元仿真,优化设计了双线圈串联型斥力机构参数,提取了多断口对地杂散电容,并通过增加断口均压电容保证多断口均压一致性。最后,搭建了LC振荡试验回路,对所研制的220 kV多断口串联快速开关型故障限流器进行了原理验证,获得了多断口快速开关在向限流电抗转移短路电流动态过程中的均压特性。此外,对该样机快速开关进行了不同燃弧时间的开断合成试验,试验测试结果表明,快速开关能够在一个周期内开断高直流分量的短路电流。
Abstract:
      With the continuous development of power grid capacity, the short-circuit current of the power grid could be very large in some certain districts, which may seriously harm the stability and safe operation of the system. A high voltage fast-switching fault current limiter with multiple breakers in series is proposed. The equipotential of driving mechanism and fracture is realized through isolation transformer, the insulated pull rod can be cancelled by using the “one-drive-two” electromagnetic repulsion mechanism, which realizes quick opening and closing. Meanwhile, the problem that the fault current limiter powered by capacitive voltage transformer(CVT)is not able to be open or close when the system is not charged is solved as well. In addition, the parameters of the repulsion mechanism with two coil series connected structure are optimized and designed by using 3D finite element simulation, the stray capacitances with multiple breakers between switches and the ground are extracted, and then the equalizing capacitances of fractures are installed to guarantee the uniformity of voltages on eight switches. Finally, a testing circuit based on LC oscillation is built to verify the principle of proposed 220 kV fault current limiter with multiple breakers in series. The voltage sharing characteristics of fast-switching with multiple breakers are obtained during the dynamic process of transition of the short-circuit current to the current limiting reactor. Furthermore, the opening and closing synthesis experiments of fast switch of the prototype with different arcing time are carried out. The testing results show that the fast-switching can switch the short-circuit current of high DC component in a cycle.
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