随桥电缆-架空混合线路的电缆护套过电压特性仿真分析  

Simulation analysis of overvoltage characteristics of cable sheath for bridge cable-overhead hybrid line

作　　者：裘立峰 杜振东 周文俊 徐星 陈向荣 QIU Lifeng;DU Zhendong;ZHOU Wenjun;XU Xing;CHEN Xiangrong(Zhejiang Huayun Power Engineering Design Consulting Company,Hangzhou 310000,China;Zhejiang Provincial Key Laboratory of Electrical Machine Systems,School of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江华云电力工程设计咨询有限公司,杭州310000 [2]浙江大学电气工程学院浙江省电机系统智能控制与变流技术重点实验室,杭州310027

出　　处：《电测与仪表》2024年第2期49-54,共6页Electrical Measurement & Instrumentation

基　　金：浙江省自然科学基金资助项目(LY18E070003);浙江大学“百人计划”(自然科学A类)项目;浙江华云电力工程设计咨询有限公司科技项目(2019C01D01P04)。

摘　　要：随桥电缆作为跨海输电系统的重要组成部分,其安全稳定运行对于整个输电系统的可靠性有重要影响。论文以舟岱大桥220 kV随桥电缆工程为研究对象,考虑架空线路的影响,基于PSCAD/EMTDC暂态仿真软件建立了随桥电缆-架空混合线路的仿真模型,对雷击故障和操作故障下的电缆护套过电压特性进行了研究。结果表明:雷击架空线路时,护套过电压幅值随故障距离的减小而增大,随杆塔接地电阻的增大而增大,过电压幅值最高可达到46.4 kV;单相接地故障下,接地相角为90°时护套过电压最严重,过电压幅值最高可达到15.9 kV;非全相操作故障下,电缆护套过电压幅值受故障距离的影响不大,两相断线的护套过电压比单相断线更严重。研究工作为随桥电缆-架空混合线路的绝缘配合设计提供了参考依据。As an important part of the cross-sea transmission system,the bridge-cable has an important impact on the reliability of the entire transmission system.Taking the 220 kV bridge-cable engineering of Zhoudai Bridge as the research object,considering the influence of overhead lines,a simulation model of the bridge cable-overhead hybrid line is established based on PSCAD/EMTDC transient simulation software.The overvoltage characteristics of the cable sheath under lightning strike and operation fault are studied.The results show that when lightning strikes the overhead line,the sheath overvoltage amplitude increases with the decrease of the strike distance,and with the increase of the tower grounding resistance,the maximum overvoltage amplitude can reach up to 46.4 kV;under a single-phase grounding fault,the sheath overvoltage is the most serious when the ground phase angle is 90°,and the maximum overvoltage amplitude can reach up to 15.9 kV;under a non-full-phase operation fault,the cable sheath overvoltage amplitude is not greatly affected by the fault distance.The sheath overvoltage of two-phase disconnection is more serious than that of single-phase disconnection.The research work provides a certain reference for the insulation coordination design of the bridge cable-overhead hybrid line.

关 键 词：随桥电缆 混合线路 雷击故障 操作故障 过电压特性 绝缘配合 

分 类 号：TM86[电气工程—高电压与绝缘技术]