2011年7月15日 现代电子技术 Jul.2011 ModernElectronics Vol。34No.14 第34卷第14期Technique 考虑变压器励磁涌流影响的保护整定 范瑾(西安邮电学院,陕西西安710061) 摘要:在大型变压器空栽冲击过程中,由于励磁涌流和负序电压的存在,如果定值整定不得当,会导致差动保护,复压 过流保护等误动作,影响设备的正常运行。为了保证定值整定的正确性,在此通过对励磁涌流产生的原因和特点进行理论 分析,结合变压器冲击过程中实际数据以厦大型变压器冲击过程中由于定值整定不舍理造成保护误动作的实例,对变压器 冲击过程中相关定值整定的原则进行了探讨。在定值的整定过程中要考虑励磁涌流的幅值、谐波含量和衰减时间以及负序 电压的幅值和衰减时间的影响。 关键词:励磁涌流;复压过流保护;定值整定;差动保护;变压器冲击 文献标识码:A 文章编号:1004—373X(2011)14—0191—04 中图分类号:TN911—34;TM773 ofTransformerInrushCurrent ProtectionValueCalculation Influence Excitation Setting Considering FAN Jin Posts (xi’anInstituteof andTelecommunuications.Xi’an7100761。China) excitationinrush and can Abstract:Inno-load of transformers,the current sequence impactprocesslarge negative voltage cause ofdifferential and over-currentifthe valuecalcu— protectionmisoperation protectioncomplexpressure protectionsetting lationisnot ordertOensurecorrectnessof value ofthe reasonable.In the calculation,the protectionsetting principleprotec— tion valuecalculationisdiscussedonthebasisofthetheoreticalofcausesandcharacteristicsoftheexcitation setting analysis inrush in with data transformer of causedthe current,andeombiniationtheactual and by during impactexamplesmisoperation unreasonable valuecalculationin transformer the valueiscal— protectionsetting large impactprocess.Whenprotectionsetting contentandattenuationtimemustbe wellastheinfluenceof and culated,theamplitude,harmonic considered,as amplitude attenuationtimeofnegativesequencevoltage. inrush over-current value Keywords:excitationcurrent;complexpressure protectionprotectionsettingcalculation;dif— ferential transformer protection impact 0