VFTO对就地化保护装置的影响分析及改进措施  

Analysis of Influences of VFTO on On-site Protection of Secondary Equipment and the Corresponding Improvement Measures

作　　者：张晓莉 刘慧海 刘伟 夏烨 庞福滨 艾淑云 ZHANG Xiaoli;LIU Huihai;LIU Wei;XIA Ye;PANG Fubing;AI Shuyun(China Electric Power Research Institute,Beijing 100192,China;Sifang Automation Software(Wuhan)Co.,Ltd,Wuhan 430233,China;State Grid Jiangsu Electric Power Co.,Ltd,Nanjing 210024,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]四方继保(武汉)软件有限公司,武汉430223 [3]国网江苏省电力有限公司,南京210024

出　　处：《电力系统及其自动化学报》2020年第7期137-144,共8页Proceedings of the CSU-EPSA

基　　金：国家电网有限公司总部科技项目资助(项目名称:VFTO对就地化保护装置的影响及测试技术研究)。

摘　　要：为解决变电站中特高压气体绝缘金属封闭开关设备GIS(gas insulated switchgear)快速瞬态过电压VFTO(very fast transient over-voltage)对保护装置就地化影响的问题,本文定性分析了GIS操作隔离开关产生的VFTO机理,通过ATP-EMTP仿真定量计算了VFTO幅值及分布规律,提出了采用改善一次系统和二次防护配合的方法以降低系统VFTO,提高二次系统的抗干扰能力。一次系统通过增加隔离开关分合闸阻尼电阻、加强接地、降低母线高度降低波阻抗、增加隔离开关分合闸速度等方法降低系统VFTO水平;二次系统通过加强信号防护及电源滤波、优化机箱结构设计与屏蔽设计、将就地装置布置在干扰较低的位置等方法提高二次系统的可靠性。为保护装置就地化可靠运行提供了有效的解决措施。To solve the problem of influences on the on-site protection of secondary equipment due to the very fast transient over-voltage(VFTO)in high-voltage gas insulated metal closed switch-gear,the VFTO generated by the disconnecting switch in gas insulated switch-gear(GIS)is analyzed,the VFTO amplitude and distribution law are calculated quantitatively,and a method of improving the primary system and secondary protection is proposed to reduce the system VFTO and improve the anti-interference capability of the secondary system. For the primary system,its VFTO level is reduced by using methods such as adding isolated switch closing and damping resistance,enhancing grounding,reducing bus bar height and wave impedance,and increasing the isolated switch speed. For the secondary system,its reliability is improved by using methods such as strengthening signal protection and power filter,optimizing the chassis structure design and shielding design,and lay outing on-site devices at low-interference locations. The research in this paper provides an effective solution for on-site equipment protection.

关 键 词：智能变电站 快速瞬态过电压 就地化 ATP-EMTP 阻抗 保护装置防护 气体绝缘金属封闭开关设备 

分 类 号：TM71[电气工程—电力系统及自动化]