干式空心电抗器噪声测量的干扰研究陈硕1，田杰1，梁兆杰1，树婷2，高璐2（1.深圳供电局有限公司，广州深圳518000；2.西安交通大学电力设备与电气绝缘国家重点实验室，西安710049）摘要：一般认为，干式空心电抗器的噪声频谱为谐波电流各频率之间的差频、合频及每个谐波的二倍频，然后实际测试得到的噪声频谱与目前理论分析的结果并不一致。文中以一台小型的干式空心电抗器为例，对噪声测量过程中的干扰现象进行了研究，并结合电磁感应理论对干扰的来源进行了解释和分析。研究结果表明，干式空心电抗器在加载单频的激励电流时，利用传声器测得的噪声频谱中除了电流频率二倍频的噪声分量外，还会出现多个电流整数倍频率的干扰分量。其中单倍频的干扰分量来源于磁场对传声器的影响，其幅值和加载电流成正比；多倍频的干扰分量来源于传声器薄膜振动和磁场的相互耦合，其幅值受磁场和声压共同影响。关键词：干式空心电抗器；噪声测量；传声器；电磁干扰StudyonInterferenceofNoiseMeasurementofDry⁃typeAir⁃coreReactorCHENShuo1，TIANJie1，LIANGZhaojie1，SHUTing2，GAOLu2（1.ShenzhenPowerSupplyCo.，Ltd.，GuangzhouShenzhen518000，China；2.StateKeyLaboratoryofElectricalInsulationandPowerEquipment，Xi’anJiaotongUniversity，Xi’an710049，China）Abstract:Itisgenerallyrecognizedthatthenoisespectrumofthedry⁃typeair⁃corereactoristhedifferencefrequen⁃cyandcombinedfrequencybetweeneachfrequencyofharmoniccurrentaswellasdoublefrequencyofeachharmon⁃ic,andthenoisespectrumobtainedbyactualmeasurementandtheresultofpresenttheoryanalysisisnotinagree⁃ment.Inthispaper,asetofsmalldrytypeair⁃corereactoristakenasanexample,theinterferencephenomenonintheprocessofnoisemeasurementisstudiedandthesourceoftheinterferenceisexplainedandanalyzedincombina⁃tionwithelectromagneticinductiontheory.Thestudyresultsshowthatincaseofloadingsingle⁃frequencyexcitationcurrentforthedry⁃typeair⁃corereactor，themultipleinterferencecomponentswithintegerfrequencyofcurrentalsooccursinadditiontothenoisecomponentofcurrentfrequencydoubledinthenoisespectrummeasuredbythemicro⁃phone.Thesingle⁃frequencyinterferencecomponentcomesfromtheinfluenceofthemagneticfieldonthemicro⁃phoneanditsamplitu...
