基于电网故障录波图判断变压器重瓦斯保护跳闸原因的方法  

Method for Determining the Cause of Transformer Heavy Gas Protection Tripping Based on Power Grid Fault Oscillogram

作　　者：王世祥 WANG Shixiang(Shenzhen Power Supply Bureau Co.,Shenzhen 518020,China)

机构地区：[1]深圳供电局有限公司,广东深圳518020

出　　处：《电工技术》2023年第18期102-104,共3页Electric Engineering

摘　　要：变压器是电网系统中发电厂和变电站重要组成部分之一,承担着不同电压等级电网联络作用,是电能高电压传输及不同电压等级电压联络的重要设备。因此,变压器除了设有防止变压器套管、出线、电流互感器、线圈、铁芯等多种元件故障的差动保护作为主保护外,还另外设有重瓦斯保护为主保护。为快速复电,需要快速判断故障类型,尤其是重瓦斯保护,其保护动作可由多种原因引起。阐述一种根据电网故障录波图判断变压器重瓦斯保护跳闸原因的方法。该方法获取变压器故障录波图上形成的继电保护开关量波形、重瓦斯保护跳闸开关量波形、主变高压侧三相电流及电压波形、主变低压侧三相电流及电压波形并进行综合分析,并通过是否存在突变波形以及检测结果,判断变压器重瓦斯保护跳闸的原因。As a key component of power plants and substations in the power grid system,transformers serve as the connection links of networks with different voltage levels,and hence are of great importance for high-voltage transmission and voltage-differential connection.Therefore,apart from differential protections against the faults of transformer bushings,outgoing wires,current transformers,coils,iron cores and other components,there is also equipped heavy gas protection as the main protection for transformers.The fast power restoration requires quick determination of the fault type,especially for heavy gas protection action,as it may be induced by a variety of reasons.This paper presents a method for determining the cause of transformer heavy gas protection tripping.The method obtains relay protection switch waveform,heavy gas protection trip switch waveform,high-voltage side three-phase current and voltage waveform of main transformer,and low-voltage side three-phase current and voltage of main transformer on the transformer fault oscillogram,and conduct comprehensive analysis.Moreover,it determines the reason for heavy gas protection tripping based on whether there exists sudden change in the waveform,and the detection results.

关 键 词：重瓦斯主保护 电气量故障 开关量波形 电流及电压波形 突变波形 

分 类 号：TM407[电气工程—电器]