核电厂辅助变压器零差保护误动作原因分析  

Analysis of Misoperation of Zero Difference Protection for Auxiliary Transformer in Nuclear Power Plant

作　　者：沈红 段琰璞 倪爽 SHEN Hong;DUAN Yanpu;NI Shuang(State Nuclear Power Demonstration Plant Co.,Ltd.,Rongcheng 264300,China)

机构地区：[1]国核示范电站有限责任公司,山东荣成264300

出　　处：《电工技术》2023年第2期140-142,共3页Electric Engineering

摘　　要：介绍了某核电厂给水泵电机启动导致辅助变压器零序差动保护误动作事件,通过现场试验、保护逻辑检查,全面地排查了零序差动保护误动作原因,提出了结合工程实际最大不平衡电流修订零序差动保护定值、优化零序差动保护闭锁逻辑等应对措施,大大提高了零序差动保护运行的可靠性,有利于辅助变压器的安全稳定运行。This paper introduces the misoperation event of the zero sequence differential protection of the auxiliary transformer in a nuclear power plant due to the startup of the feed pump motor.Through the field test and the protection logic inspection,the causes of the misoperation of the zero sequence differential protection are comprehensively investigated,and the corresponding measures such as revising the zero sequence differential protection setting based on the maximum unbalanced current of the project,optimizing the locking logic of the zero sequence differential protection are proposed,which greatly improves the reliability of the operation of the zero sequence differential protection,it is beneficial to the safe and stable operation of auxiliary transformer.

关 键 词：辅助变压器 零序差动保护 闭锁逻辑 

分 类 号：TM588[电气工程—电器]