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1、第34卷第6期電力電容器與無功補償Vo1.34No.62013年l2月PowerCapacitor&ReactivePowerCompensationDec.2013電容器噪聲傳播規(guī)律的研究祝令瑜,汲勝昌,曹濤,吳鵬。,劉源,傅晨釗(1.西安交通大學(xué)電力設(shè)備電氣絕緣國家重點實驗室,陜西西安710049;2.合肥供電公司,安徽合肥340100;3.江蘇省電力科學(xué)研究院,江蘇南京210036;4.上海市電力公司電力科學(xué)研究院,上海200437)摘要:隨著直流輸電的快速發(fā)展.換流站用交流濾波電容器輻射出大量噪聲,對電容器輻射傳播特性的研究意義重大。本文建立了噪聲特性研究試驗平臺,對電容器在各頻率下不
2、同電流不同距離處的噪聲進行了測量,分析了電容器輻射噪聲隨著距離變化的規(guī)律。結(jié)合聲傳播理論對電容器輻射噪聲的傳播模式進行了辨識。結(jié)果表明,在本文測量范圍內(nèi),頂面和底面輻射噪聲表現(xiàn)為明顯的球面波輻射模式,而側(cè)面輻射噪聲在距離較近時表現(xiàn)為柱面波傳播模式,在距離較遠時表現(xiàn)球面波傳播模式。隨著測量距離的加倍,電容器整體輻射噪聲降低約5.4dB.說明電容器整體輻射噪聲以接近球面波的形式傳播。關(guān)鍵詞:高壓直流輸電;電容器;噪聲傳播規(guī)律;降噪中圖分類號:TM531.5文獻標識碼:A文章編號:1674.1757(2013)06-0059-06StudyonPropagationLawofCapacitorAud
3、ibleNoiseZHULing.yu,JISheng.chang,CAOTao,WUPeng,LIUYuan,F(xiàn)UChen—zhao(1.StateKeyLaboratoryofElectricalInsulationandPowerEquipment,Xi’anJiaotongUniversity,Xi’an710049,China;2.HefeiPowerSupplyCompany,Hefei340100,China;3.JiangsuElectricPowerResearchInstitute,Nanjing210036,China;4.ShanghaiMunicipalElectri
4、cPowerCompanyElectricPowerResearchInstitute,Shanghai200437,China)Abstract:Withfastdevelopmentofhigh—voltageDC(HVDC)transmissionsystem,alargeamountofnoiseisradiatedfromtheacfiltercapacitorsofconverterstationsanditissignificanttostudythepropagationlawofcapacitoraudiblenoise.Inthispaper,thetestplatform
5、forthestudyofcapacitornoisecharacteristicsisestablished.Thenoiselevelsradiatedfromthetestedcapacitoralemeasuredatseveraldistancesanddifferentcurrentsundereach~equency,thevariationrelationofradiationnoiseofcapacitorwithdistanceisanalyzedandthepropagationmodeofcapacitornoiseisidentifiedbasedonthetheor
6、yofsoundpropagation.Itisshownbytheresultthat,inthemeasurementrangeofthispa-per,theradiationofnoisefromthebottomandtopsurfacesisobviouslyasphericalwavemode,where—astheradiationofnoiseatsideiscylindricalwavemodeatneardistanceandissphericalwavemodeatremotedistance.Thetotalnoiseleveldecreases5.4dBasthem
7、easurementdistancedoubled,indi—caringthatthetotalradiationnoiseofcapacitorspropagatescloselyintheformsphericalwavemode.Keywords:HVDC;capacitor;noisepropagationlaw;noisereduction收稿日期:2013-05.14基金項目:國家自