励磁系统误强励工况下发电机保护逻辑优化  

Protection Logic Optimization of Generator in Faulty Forced Excitation of Excitation System

作　　者：卢嘉华[1] 陈新琪 王珍女 吴跨宇[1] 杨涛[1] 

机构地区：[1]国网浙江省电力公司电力科学研究院,杭州310014 [2]浙江省浙能技术研究院,杭州311121 [3]中国电力工程顾问集团华东电力设计院有限公司,上海200063

出　　处：《浙江电力》2017年第8期18-23,共6页Zhejiang Electric Power

摘　　要：分析了现有发变组保护在励磁系统负载误强励典型事故时的动作行为,提出了保护逻辑优化设计方案。该方案充分利用现有保护装置与励磁系统之间的故障信息,优化设计了误强励相关判据,并调整了现有保护动作行为。采用该方案可避免发电机在负载误强励状态下先行解列而引发电压飞升现象,有效缓解误强励等严重事故的危害程度,降低了大容量发电机励磁系统特别是磁场断路器在负载误强励等极端工况下的灭磁风险。相关研究表明,采用静止励磁系统的大容量机组继电保护装置如能在机组发生负载误强励事故时先行灭磁,可以有效降低对磁场断路器的弧压要求,提高事故灭磁的可能性。This paper analyzes action behavior of the generator-transformer unit in the faulty forced excitation accident of excitation system and proposes an optimized logic design scheme. The scheme fully uses the fault information of the existing protection device and excitation system to optimally design the criterion of faulty forced excitation and adjust the existing protection action. The scheme can avoid voltage surge due to generator splitting in faulty forced excitation conditions to effectively mitigate severe accidents such as faulty forced excitation and reduce the deexcitation risk of large generator excitation system in faulty forced excitation conditions. The relevant research shows that deexcitation conducted by relay protection device of large generator with static excitation system in the case of faulty forced excitation conditions can reduce the arc voltage requirement on field breakers and increase the reliability of accident deexcitation.

关 键 词：误强励 磁场断路器 发变组保护 逻辑优化 动作行为 

分 类 号：TM31[电气工程—电机]