大型水轮发电机失磁保护与低励限制配合问题的探讨  

Discussion on coordination between loss of excitation protection and under excitation limit control for large hydro-generator

作　　者：李晖[1] 鲁功强 王育学[2] 洪心[1] 邹键[1] 封孝松 

机构地区：[1]中国长江电力股份有限公司三峡水利枢纽梯级调度通信中心,四川成都610041 [2]强电磁工程与新技术国家重点实验室(华中科技大学),湖北武汉430074 [3]溪洛渡水力发电厂,云南昭通657300

出　　处：《电力系统保护与控制》2014年第5期68-72,共5页Power System Protection and Control

摘　　要：有关整定导则要求"失磁阻抗判据应校核不抢先于励磁低励限制动作",但工程上失磁保护与励磁低励限制的整定是分开进行的,并且在不同的坐标系中描述,容易造成二者动作失去配合。针对大型水轮发电机常用的失磁保护定子侧静稳阻抗判据,结合具体保护装置实现方法,论述了其与低励限制动作区如何进行比较的计算方法,探讨了失磁保护与低励限制的动作配合关系。并在最后讨论了改善低励限制与失磁保护定子侧阻抗判据配合的方案。According to related setting calculation guide, the impedance criterion of loss of excitation （LOE） protection should be verified to make sure LOE protection operates before under excitation limit （UEL） control. However, the setting values of LOE and UEL are calculated separately, and their operation characteristics are defined in different coordinate systems, leading to the mismatch of each other easily. Considering the steady state stability impedance criterion commonly used for large hydro-generators LOE protection, this paper presents an algorithm of comparing the operation zone of LOE and UEL with the concern of specific protection device. Furthermore, the paper investigates the coordination relationship between LOE protection and UEL control. At last, several schemes are given on better cooperation of UEL with LOE impedance criterion on stator side.

关 键 词：大型水轮发电机 失磁保护 静稳边界 低励限制 阻抗判据 

分 类 号：TM312.1[电气工程—电机]