10 kV一母多馈电缆线路过电压传递影响因素分析  

Influence Factors of Overvoltage Transfer in 10 kVBus with Multiple Feeders of Cable Line

作　　者：曹京荥 陈杰 谭笑 李陈莹 胡丽斌 方春华[2] 陶玉宁 游海鑫 CAO Jingying;CHEN Jie;TAN Xiao;LI Chenying;HU Libin;FANG Chunhua;TAO Yuning;YOU Haixin(State Grid Jiangsu Electric Power Research Institute,Nanjing 210000,China;School of Electrical and New Energy,Three Gorges University,Yichang 443000,China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,南京210000 [2]三峡大学电气与新能源学院,湖北宜昌443000

出　　处：《电瓷避雷器》2024年第1期131-140,共10页Insulators and Surge Arresters

基　　金：国网江苏省电力有限公司科技项目(编号:J2021070)。

摘　　要：10 kV电缆发生故障时,弧光接地会产生过电压,造成电网波动,影响供电安全。利用PSCAD建立一母多馈线模型,详细分析了不同条件下馈线条数、中性点接地电阻阻值和电缆长度对电缆中过电压传递特性的影响。结果表明:电缆馈线增加时,发生弧光接地故障,由行波传递分流作用使传递到非故障电缆馈线过电压幅值降低;小电阻接地故障相将产生较高过电压,过电压传递到非故障馈线上时幅值仍较大,给非故障电缆绝缘产生危害;中性点接地电阻增加时,非故障馈线故障相电压幅值降低,非故障相电压故障升高;故障电缆的长度增加,非故障电缆上过电压幅值降低。研究结果可为选取合理选择参数数值,抑制过电压产生提供依据。When 10 kV cable fails,arc grounding will produce overvoltage,which will cause power grid fluctuation and affect the power supply safety.PSCAD is used to establish a multi feeder model of one bus,and the effects of feeder number,neutral grounding resistance and cable length on the transmission characteristics of overvoltage in cables are analyzed in detail.The results show that when the number of cable feeders increases,the arc grounding fault occurs,and the over-voltage amplitude transferred to the non fault cable feeder decreases due to the traveling wave transfer shunt effect;The fault phase with small resistance will produce higher overvoltage,and the amplitude of overvoltage is still large when it is transferred to the non fault feeder,which will cause harm to the insulation of non fault cable;When the neutral grounding resistance increases,the fault phase voltage amplitude of non fault feeder decreases and the fault phase voltage increases;When the length of the faulty cable increases,the overvoltage amplitude of the non faulty cable decreases.The research results can provide a basis for selecting reasonable param⁃eter values and suppressing overvoltage.

关 键 词：一母多馈线 过电压 弧光接地 故障接地 

分 类 号：TM862[电气工程—高电压与绝缘技术]