西北_华中联网背靠背直流极区的接地保护设计_龙英.pdf

第31卷 第2 期 高　电　压　技　术 Vol. 31 No.2 42 2005 年　　2 月 High Voltage Engineering Feb. 　2005 　　 西北—华中联网背靠背直流极区的接地保护设计 龙　英 (北京网联直流输电系统工程有限公 , 北京100088) 摘　要:介绍了背靠背工程直流系统保护的配置并依据工程功能规范书的设计原则和要求, 结合背靠背工程的具 体设备和特点仿真研究了直流极区内接地故障, 提出以保护区接地保护为主保护、背靠背差动保护为后备保护的 配置方案, 详细说明了保护采用的原理、故障策略以及保护间的配合要求, 并通过实时数字仿真测试, 为直流系统 保护设备的制造和控制保护系统调试提供了重要和必要的依据。 关键词:直流工程;背靠背;直流系统保护;保护区接地保护;背靠背差动保护 中图分类号:TM7　　　文献标识码:A　　　文章编号:100-3 6520(2005)02-0042-04 Design Study of Protection for DC Block Ground Fault for Northwest to Central China BTB HVDC Link LONG Ying (Beijing HVDC Syste Engineering Co., Ltd, Beijing 100088, China) A stract:Being the first back to back project for network link in China, the Northwest to Central China back to back project plays and i portant role in DC trans ission construction, operation and localization of anufacturing of HVDC equip ent. BTB has its own characteristics, which akes the design study of DC syste protection ore i portant to ensure DC syste operating safely and reliably. In this paper, the DC syste protection sche efor the BTB is introduced, and the si ulation study is ade for DC block ground fault according to principles and require- ents of the technical specification and the project configuration. Theblock ground fault protection is the ain pro- tection, while BTB differential protection as backup. The pri ary objective, detection principle and the coordination require ents for both protection functions are described in details. A real ti e digital si ulator is used to test both functions. Both the study work and the test results could providebasis for the anufacture and co issioning of the control and protection syste . Key words: