第39卷第2期2023年2月电网与清洁能源PowerSystemandCleanEnergyVol.39No.2Feb.2023智能电网SmartGrid——————————基金项目：宁夏自然科学基金项目（2020AAC03484）；国网宁夏电力有限公司科技项目（5229DK190055）。ProjectSupportedbytheNaturalScienceFoundationofNingxia（2020AAC03484）；theScienceandTechnologyResearchProgramoftheStateGridNingxiaCompany（5229DK190055）.ABSTRACT：Inrushcurrentoftenoccursinpowertransformersanditisanimportantfactoraffectingthecorrectoperationrateofdifferentialprotection.What’smore，thesaturationofthecurrenttransformer（CT）causedbyalargefaultcurrentalsoaffectsthedifferentialprotection.Inordertoimprovethereliabilityoftransformerdifferentialprotection，thispaperproposesaninrushcurrentandfaultcurrentidentificationmethodbasedonwaveformpartitionandreconstruction.Firstly，thewaveformcharacteristicsofinrushcurrentandfaultcurrentwithCTsaturationareanalyzed，andtheideaofpartitionandreconstructionofdifferentialcurrentisraised.Basedonthisidea，thedifferentialcurrentisdividedintothelinearregionandthesaturationregionandreconstructedbyusingwaveletcoefficientenergyandsecondderivativeenergyasajointcriterion.Next，theabsolutevalueratiooftheamplitudeisconstructedaccordingtothewaveformtrend，andtheratioisappliedtodeterminewhetherthetransformerisfaultornot.Finally，throughalargenumberofsimulationtests，waveformanalysisinvariousscenarios，andcomparisonwiththetraditionalmethod，theeffectivenessandsuperiorityoftheproposedmethodareverified.KEYWORDS：transformerdifferentialprotection；inrushcurrent；CTsaturation；waveletenergy；waveformpartitionandreconstruction摘要：励磁涌流是影响差动保护正确动作率的重要因素，在电力变压器中时常发生，而大故障电流导致的电流互感器饱和也会对差动保护造成影响。为了提高差动保护的可靠性，该文提出一种基于波形分区重构的变压器励磁涌流与故障电流识别方法。首先分析了变压器励磁涌流和电流互感器饱和的波形特性，提出了将差动电流分区和重构的思想。基于此，采用小波系数能量与二阶导数能量作为联合判据，将差动电流划分为线性区和饱和区并重构。然后根据波形趋...
