10kV系统单相接地保护的设置  

Settings of Single-phase Grounding Protection for 10 kV System

作　　者：顾克志 GU Kezhi(Shaanxi Future Energy and Chemicals Co.,Ltd.,Yulin 719000,China)

机构地区：[1]陕西未来能源化工有限公司,陕西榆林719000

出　　处：《电工技术》2023年第14期186-188,共3页Electric Engineering

摘　　要：针对中性点不接地的10 kV系统,阐述了发生单相接地时的电容电流和零序电压的关系,分析了电容电流分布特点,介绍了单相接地保护计算及保护设置,零序互感器和保护装置的选择。实践证明,只要从保护装置、零序互感器、零序定值的整定及报警的设置等制定合理的方案,就可以找到一条适合现场实际应用的单相接地故障快速选线方法。For the 10 kV system with an ungrounded neutral point,the relations between capacitance current and zero-sequence voltage when single-phase grounding occurs are elaborated,and the characteristics of capacitance current distribution are analyzed as well.Single-phase grounding protection calculation and protection setting,zero-sequence transformer and protection device selection are introduced.Practice has proved that if a reasonable scheme is formulated from the protection device,zero-sequence transformer,zero-sequence value setting and alarm setting,a single-phase ground fault fast line selection method suitable for practical applications on the site can be found.

关 键 词：故障 接地 零序电流 保护 

分 类 号：TM863[电气工程—高电压与绝缘技术]