新能源电站非直接接地系统电缆端部单相接地保护方法探讨  

Analysis and discussion on the protection method of single-phase grounding at the end of the cable of non-grounded power system

作　　者：李毅 谢铁兵 雷阳 赵伟刚 LI Yi;XIE Tiebing;LEI Yang;ZHAO Weigang(Xi’an Yitong Thermal Technology Service Co.,Ltd,Xi’an 710032;Hua’neng Luoyang Thermoelectric Co.,Ltd,Luoyang,He’nan 471000;Xi’an Thermal Power Research Institute,Xi’an 710032)

机构地区：[1]西安益通热工技术服务有限责任公司,西安710032 [2]华能洛阳热电有限责任公司,河南洛阳471000 [3]西安热工研究院有限责任公司,西安710032

出　　处：《电气技术》2023年第1期76-80,共5页Electrical Engineering

摘　　要：新能源电站6~35kV电压等级非直接接地系统中,电缆终端或中间接头受现场制作、安装工艺影响故障多发,其中单相接地故障较为常见。为及时有效地切除电缆端部单相接地故障,本文提出电缆端部单相接地故障零序电流差动保护方法,分析不同接地方式差动特性,并对保护的配置、定值进行描述。该保护方法实现简单,具有一定的实用价值。In the 6kV to 35kV voltage level non-grounded power system, the cable terminal or intermediate joint is frequently affected by the on-site manufacturing and installation process, and single-phase grounding fault is more common. In order to remove single-phase grounding faults timely and effectively, this paper proposes a zero sequence current differential protection method for cable end single-phase grounding fault, analyzes the differential characteristics of different grounding modes, and describes he configuration and setting of the protection. This protection method is simple to realize and has certain practical value.

关 键 词：非接地电力系统 电缆端部 单相接地故障 零序电流差动保护 

分 类 号：TM862[电气工程—高电压与绝缘技术]