摘要
针对全国近年大量加装的线路型终端避雷器,文中运用雷电波陡度理论,首创性推导出35~500kV线路采用线路型终端氧化锌避雷器时断路器断口所承受的入侵雷电波过电压计算公式。同时通过公式计算表明:线路型终端避雷器不满足绝缘配合要求,因而不能有效保护断路器断口;而变电站型终端避雷器满足绝缘配合要求,能有效保护断路器断口。这是全国各电压等级线路在大量加装线路型终端避雷器后断路器断口击穿事件仍时有发生的根本原因,也是文中重点论述并提醒行业、协会对反事故措施文件及相关技术规范尽快纠正的依据。
For the line-type terminal arresters on transmission line, the theory of lightning wave steepness is adopted to deduct a calculation formula of the overvoltage induced by intruding lightning wave on the circuit breaker gap when terminal zinc oxide arrester is used on the 35-500 kV transmission line. The calculation result of the formula shows that the line-type terminal arrester does not meet the requirement of insulation coordination, so it cannot protect the circuit breaker effectively. While the substation-type terminal arrester meets the requirement of insulation coordination and can effectively protect the gap of the circuit breaker. This is the reason why gap breakdown accidents of the circuit breakers on different voltageevel transmission lines still happen occasionally in China after installing a large number of line-type terminal arresters, and this is also the basis for the authors to suggest the industry association to correct its relevant files and technical specifications concerning the anti-accident measures as soon as possible.
作者
谢海
黄金
张翌晖
XIE Hai;HUANG Jin;ZHANG Yihui(Hezhou Power Supply Bureau,Guangxi Power Grid Co.,Ltd.,Guangxi Hezhou 542899,China;Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Nanning 530023,China)
出处
《高压电器》
CAS
CSCD
北大核心
2019年第10期176-181,共6页
High Voltage Apparatus
关键词
入侵雷电波
断路器断口
线路型终端避雷器
变电站型终端避雷器
过电压
intruding lightning wave
circuit breaker gap
line-type terminal arrester
substation type terminal arrester
overvoltage
