配电网多电缆线路耦合接地故障分析及处理  

Analysis and Handling of Coupling Grounding Fault for Multi-Cable Lines in Distribution Network

作　　者：马洲俊 陈建坤[2] 兰岚[2] 许洪华[2] Ma Zhoujun Chen Jiankun Lan Lan Xu Honghua(Hohai University Nanjing 210098 China Nanjing Power Supply Company Nanjing 210019 China)

机构地区：[1]河海大学能源与电气学院,南京210098 [2]南京供电公司,南京210019

出　　处：《电气工程学报》2017年第10期37-44,共8页Journal of Electrical Engineering

基　　金：江苏省电力公司重点科技项目“基于大数据的主动配电网运行监测与故障诊断技术研究与应用”(J2017074);国家高技术研究发展计划(863计划)“智能配电网优化调度关键技术研究”(2012AA050214)资助

摘　　要：电力电缆具有可靠性高、供电能力强、节省空间及对环境影响程度小等优点,因此,城市配电网电缆化率不断提高。本文就一起配电网多电缆线路相继跳闸的故障展开分析,对同母线的多条10kV电缆出线故障、电缆屏蔽层接地电流、零序电流互感器正确接线以及用户内部中性点接地的影响等问题进行深入分析,并从时间和空间上对文中所提的耦合接地故障进行关联分析,演绎了故障发生、发展的过程,提出了改进建议,为电网运维及管理人员正确处理复杂耦合配电网故障提供参考。Power cable has many advantages such as high reliability, strong power supply capacity, space saving, environmentally friendly and so on. Therefore the penetrance of power cable in city distribution network is increasing. In the paper the successively tripping fault of one particular distribution network multi-cable line is studied. Aiming to one bus, the fault of lOkV multi-cable lines, grounding current of cable shielding layer, and impact of zero sequence current on correct wiring and neutral point earthing of users sides are studied. The coupling grounding fault is analyzed combining time and space, also the occurrence and development of fault is deduced. Finally, some advices are proposed for better operation and dealing with complicated coupling fault.

关 键 词：配电网 多电缆线路 单相接地 耦合故障 零序电流互感器 中性点接地 

分 类 号：TM726[电气工程—电力系统及自动化]