基于负序电压分布的发电机定子匝间短路保护  

Inter-turn short-circuit protection of generator stator winding based on negative-sequence voltage distribution

作　　者：俞胜[1] 仇新宏[2] 李哲[2] 王祖光[1] 

机构地区：[1]国网电力科学研究院.江苏南京210003 [2]国电南瑞科技股份有限公司,江苏南京210061

出　　处：《电力自动化设备》2010年第9期72-74,共3页Electric Power Automation Equipment

摘　　要：提出发电机定子绕组匝间短路保护新判据方法,包括主判据和闭锁判据。主判据由发电机机端负序电压和中性点负序电流构成;闭锁判据由发电机机端负序电压、主变高压侧负序电压、主变中压侧负序电压、高厂变1分支负序电压、高厂变2分支负序电压构成。如果主判据为真,再判断闭锁判据是否为真,如果闭锁判据也为真,则立即闭锁保护,否则延时保护动作并发告警信号。所提方法不仅可对发电机的各种非对称故障进行反应,还可以对主变及厂用变压器的一部分内部故障进行反应;与纵向零序电压方案相比较,可不增加一次设备并且容易双重化;在靠近发电机中性点处相间故障时,可得到较高的灵敏度。A new method is proposed for the inter-turn short circuit protection of generator stator winding,including main criterion and block criterion.The main criterion is composed of the negative sequence voltage of generator terminal and the negative sequence current of generator neutral point.The block criterion is composed of the negative sequence voltage of generator terminal,the negative sequence voltage of main transformer at high voltage side,the negative sequence voltage of main transformer at middle voltage side,the negative sequence voltage of plant transformer branch 1 and the negative sequence voltage of plant transformer branch 2.If both the main criterion and the block criterion are true,immediately block the protection;if the main criterion is true and the block criterion is false,delay the protective operation and send alarm signal.It reacts to different asymmetric faults of generator and some internal faults of main transformer and plant transformer.Compared with the longitudinal zero-sequence voltage protection,it can be redundantly configured without adding any primary equipment.It has higher sensitivity to the inter-phase fault near generator neutral point.

关 键 词：发电机 定子绕组 匝间短路 负序电压分布 主判据 闭锁判据 

分 类 号：TM772[电气工程—电力系统及自动化]