两起35 kV小电阻接地系统发展性短路故障的分析  

Analysis of two developing short circuit faults in 35 kV power system by low resistance grounding

作　　者：闫石 钟素梅 YAN Shi;ZHONG Sumei(Shenzhen Airport(Group)Co.,Ltd.,Shenzhen 518128;Shenzhen Metro Operation Group Co.,Ltd.,Shenzhen 518040)

机构地区：[1]深圳市机场(集团)有限公司,深圳518128 [2]深圳地铁运营集团有限公司,深圳518040

出　　处：《黑龙江电力》2024年第5期431-437,共7页Heilongjiang Electric Power

摘　　要：针对某35 kV小电阻接地供电系统发生的两起35 kV母线发展性短路故障中继电保护均正确动作,最终35 kV开关柜烧毁的情况进行分析,并提出改进措施。通过调取故障录波,采用对称分量法结合一次设备检查,对故障过程、保护动作进行分析,并应用电磁暂态仿真软件PSCAD/EMTDC对故障波形进行仿真验证。继电保护配置、整定不合理是主要原因,并提出改进建议。According to two developing short circuit faults of busbar in a 35 kV power system by low resistance grounding,which is correct operation of relay protection but 35 kV C-GIS are damaged,analysis cause and improvement suggestions are proposed.Combined with fault recording and inspection,fault processes and protection operations are analyzed by symmetrical component method,simulated and verified by PSCAD/EMTDC.The unreasonable configuration and setting of relay protection are main cause and the improvements are proposed.

关 键 词：35 kV供电系统 小电阻接地方式 发展性短路故障 继电保护 整定计算 

分 类 号：TM401[电气工程—电器]