多相补偿距离继电器在振荡且伴随单相接地故障下的动作性能分析  

Performance Analysis of Multiphase Compensated Distance Relay in Single-phase-to-ground Fault With Power Swing

作　　者：崔柳[1] 董新洲[1] 施慎行[1] 王宾[1] DOMINIK Bak 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《中国电机工程学报》2013年第34期214-222,共9页Proceedings of the CSEE

基　　金：国家自然科学基金重点基金资助项目(50937003);国家自然科学基金重大国际合作项目(51120175001);国家自然科学基金项目(51007045);清华大学自主科研计划(20111081024)~~

摘　　要：被广泛应用于电力系统的距离保护多采用阻抗距离继电器为核心元件。阻抗距离继电器受系统振荡影响,需配合振荡闭锁元件构成保护,使得距离保护变得复杂。以多相补偿距离继电器为核心的距离保护能够防止振荡对距离保护的影响而无需时间闭锁元件。因此,对多相补偿距离继电器动作特性进行深入分析是十分必要的。通过分析多相补偿距离继电器的动作判据,给出了多相补偿距离继电器包含的3个元件在系统振荡且发生单相接地故障情况下的动作特性,包括反映故障相元件的拒动范围和反映非故障相元件的误动范围,并指出了其在构成距离保护II段、III段时的不足。PSCAD仿真结果验证了所得结论。An impedance relay is the core element of a distance protection, which is widely applied in power systems. Impedance relay’s operation can be affected by power swings. Therefore, a power swing blocking element is required to work with, which makes the distance protection scheme more complex. Using the multiphase compensated distance relay as the base, the resultant distance protection can be made insensitive to the power swings and no additional time blocking element is needed. So, it is valuable to analyze the operation characteristics of multiphase compensated distance relays. By analyzing the relay’s equation, this paper reported on the performance of the three elements in multiphase compensated distance relays in the case of a single phase to ground fault during power swings. This paper defined the missing operation’s area for a faulty phase element and the maloperation’s area for a health phase element. The paper also pointed out the disadvantages of the relay working as the protection of II or III section. PSCAD simulation results verified the conclusions.

关 键 词：距离保护 电力系统振荡 多相补偿距离继电器 单相接地故障 

分 类 号：TM77[电气工程—电力系统及自动化]