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. DOI: 10.7500/AEPS20190415005.
LYU Wei,LIU Yunfei,ZHOU Qiwen, et al.Fast Switching High Voltage Fault Current Limiter with Multiple Breaks[J].Automation of Electric Power Systems. 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 Breaks
DOI:10.7500/AEPS20190415005
关键词: 故障限流器(FCL)  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 (FCL)  Multiple switches in series  Fast switch  Electromagnetic repulsion driving mechanism  Finite element simulation  Voltage sharing.
上网日期:2019-09-06
基金项目:智能配电柔性多状态开关技术、装备及示范应用
作者单位E-mail
吕玮 南京南瑞继保电气有限公司 江苏 南京 lvw@nrec.com 
刘云飞 南京南瑞继保电气有限公司 江苏 南京 liuyf@nrec.com 
周启文 南京南瑞继保电气有限公司 江苏 南京 zhouqw@nrec.com 
方太勋 南京南瑞继保电气有限公司 江苏 南京 fangtx@nrec.com 
王智勇 常州博瑞电力自动化设备有限公司 江苏 常州 wangzy_br@nrec.com 
张广泰 南京南瑞继保电气有限公司 江苏 南京 zhanggt@nrec.com 
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。本文提出了一种多断口串联的高压快速开关型故障限流器,采用“一拖二”式电磁斥力操作机构,通过隔离变压器将操作机构与断口等电位,取消了绝缘拉杆,既实现了快速分合闸,也解决了采用电容式电压互感器(CVT)分压供能时系统不带电情况下无法分合闸问题。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。搭建了LC振荡试验回路,对所研制的220kV多断口串联快速开关型故障限流器进行了原理验证,获得了快速开关多断口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在接到分断指令后3ms即可完成直流分量超过80%的25kA短路电流开断,恢复电压峰值374kV。
Abstract:
      As the rapid increase of power grid capacity, the short-circuit current of the grid could be very large in some certain district, which may seriously harm the stability and safe operation of the system. To solve this problem, a fault current limiter with multiple high speed switches in series is proposed in this paper. The features include "one-drive-two" topology and high-potential installation of the electromagnetic repulsion driving mechanism, and isolation transformers are applied to achieve high-potential power supply. Therefore, the insulating pole of the switch can be cancelled, which helps reducing the weight of the moving contact, so that it is easier to realize quick opening and closing. Meanwhile, the problem that the current limiter which is powered by capacitive voltage transformer (CVT) is not able to operate when the system is not charged does not exist in the proposed scheme. In addition, the parameters of the repulsion mechanism are optimized for two coils series connected structure using 3D finite element simulation. Also, the stray capacitances between switches and the ground are extracted, and then the equalizing capacitances are decided to guarantee the uniformity of voltages on each switch. A test system based on LC oscillation is built to test and verify the proposed 220 kV fault current limiter prototype. The dynamic voltage sharing characteristics of the prototype during the transition of the short circuit current to the current limiting reactor are obtained. Furthermore, the opening tests of the prototype with different arcing time are carried out. The test results show that the series-connected fast switches are capable of breaking 25 kA short circuit current with DC component more than 80% in 3ms after receiving the breaking command, and the peak value of the recovery voltage is about 374 kV.
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