励磁涌流引起的变压器差动保护误动作分析及对策  

An Analysis and Corresponding Countermeasures for Transformer Differential Protection Misoperations Caused by Magnetic Inrush Current

作　　者：任保瑞 赵锋[2] 刘小改 李文友 

机构地区：[1]二滩水力发电厂,四川攀枝花617000 [2]西安供电局,西安710048

出　　处：《电网与清洁能源》2010年第10期6-9,13,共5页Power System and Clean Energy

基　　金：高等学校博士学科点专项科研基金资助项目(20050213006);黑龙江省科技攻关项目(GD07A304)

摘　　要：励磁涌流和内部故障的可靠鉴别是实现变压器差动保护的关键问题,它直接制约着变压器差动保护正确动作率。介绍了一起励磁涌流引起的变压器差动保护误动作行为。对变压器差动保护的配置、故障录波数据和保护动作行为进行了分析,结合二次谐波制动原理和间断角制动原理对故障录波数据中变压器励磁涌流的谐波数据和波形进行了详细分析,提出了对励磁涌流相关整定值进行改进的防范对策。分析方法及过程具有一定的参考价值。Reliable distinguishing between the magnetic inrush current and inside fault is essential in the transformer differential protection, as it determines the correct operating rate of the transformer differential protection. This paper introduces one case of transformer differential protection misoperation caused by magnetic inrush current, analyzing the configuration of its transformer differential protection, data of the failure recorder and the operation behavior. Through an in-depth analysis of the harmonic data and the waveform of the magnetic inrush current in the transformer based on the theory of secondary harmonic restrain principle and the dead angle restrain principle, the paper proposes a countermeasure strategy of modification for the setting data related to the transformer differential protection. The analyzing method and analysis procedure can serve as references for future studies.

关 键 词：励磁涌流 川渝电网 变压器差动保护 二次谐波 间断角 

分 类 号：TM41[电气工程—电器] TM403.5