500 kV主变异常跳闸的原因分析及处理  

Cause Analysis and Handling of Abnormal Tripping of 500 kV Main Transformer

作　　者：陈根 赖武 CHEN Gen;LAI Wu(CNOOC Fujian Gas Power Generation Co.,Ltd.,Putian 351100,China)

机构地区：[1]中海福建燃气发电有限公司,福建莆田351100

出　　处：《电工技术》2024年第16期200-202,208,共4页Electric Engineering

摘　　要：通过分析某电厂一起6 kV开关三相短路故障造成500 kV主变及高厂变差动速断保护误动作事故,探讨变压器在不同保护运算方式下,主变及高厂变差动速断保护整定值的优化方案,最后提出防止主变及高厂变差动速断保护误动的措施,以提高保护装置动作的选择性,同时也为以后类似问题的调查分析提供借鉴。This paper focuses on a three-phase short circuit fault which was encountered by a 6 kV switch in an actual power plant and caused undesired action of the differential instantaneous trip relays of the 500 kV main transformer and the high voltage auxiliary transformer.It discusses the optimization scheme for parameter tuning of the differential instantaneous trip relays of the main transformer and the high voltage auxiliary transformer with respect to different protection calculation methods.It also proposes measures to prevent undesired action of the differential instantaneous trip relays and to improve selectivity of relays′action.The paper provides useful information for coping with similar problems.

关 键 词：变压器 差动速断保护 三相短路 

分 类 号：TM41[电气工程—电器]