南澳电气NAJFXD局部放电超声自动***系统NAJFXDautomaticPDdischargepositioningsystem长期以来，运作中大型变压器的故障检测及***始终是***们关注的焦点问题。***“七五”***科技攻关项目“大型变压器局部放电超声***方法及装置的研究“课题中研制的为解决这一问题提供了有效手段。先后在葛州坝500kV开关站、武汉凤凰山500kV变电站、上海变压器厂、合肥变压器厂、衡阳变压器厂、广州供电局、武汉供电局、湖南电力局、重庆变压器厂、武钢等处对数百台变压器，电抗器进行局部放电超声测量。该系统工作可靠、操作方便，满足测量要求。作为电力部“八五”***推广项目之一，目前该电装置已广泛应用于东北、华中、华东、华北和西北等有关单位的电力测试研究及现场测量。南澳电气NAJFXD局部放电超声自动***系统集高性能计算机、高灵敏度局放声测探头、程控放大滤波、高速A/D转换器、瞬态波形记录、信号分析、故障***计算机软件于一体，适用于大型变压器和充油高电压电器设备以及GIS和其他电力运行设备中局部放电超声信号的采集、测量、分析和***以及在线监测。对通常产生的变压器围屏、引线、金属件及高压线圈表面的放电能迅速判明故障位置。***误差小于250mm，整套测量系统能检测出小于1000pC局部放电量的超声信号。功能与特点：1、基于Windows平台下的软件，使局部放电超声波探测的操作、分析更简捷。2、超声波传感器具有低噪声、高灵敏度和抗干扰性能，使信号的获取更可靠。3、南澳电气NAJFXD局部放电超声自动***系统具有局部放电超声波信号的电-声***和声-声***功能，使现场测量更灵活。4、任意选择超声波信号的球面***计算或双曲面***计算，使***结果更***。5、用立体几何图形展现超声波探头和***点的坐标位置。6、方便建立测量和***的数据库，便于进一步分析和管理。7、南澳电气NAJFXD局部放电超声自动***系统还可以作为局部放电在线监测仪使用，可监测电力设备的局放产生和发***展。技术参数：超声探头灵敏度：-150dB输入通道数：2/6/8A/D转换精度：8bit&plu***n;1/2LSB采样长度：32k/通道***小可测放电量：＜50pC(实验室）＜300(1000)pC（现场）***小***误差：＜50mm(实验室)＜250mm（现场）NAJFXDTypeLocalDischargeUltrasonicAutomaticPositioningDeviceThefailuretestingandpositioningofoperatingthemediumandlargesizedtransformersh***ealwaysbeenthepointsthatelectricalengineersfocusforalongtime.TheNAJFXDsystem,manufacturedinthelarge-sizedtransformerlocaldischargeultrasonicpositionmethodandequipmentresearchsubjectwhichisoneofthenationalkeyscientificandtechnologicalprojecthasprovidedaneffectivesolution.TheNAJFXDsystemhascarriedtheultrasonicmeasurementtothelocaldischargeofthehundredsoftransformersandreactorinGezhouDam500kVswitchstation,WuhanPhoenixMountain500kVtransformersubstation,Shanghaitransformerfactory,Hefeitransformerfactory,Hengyangtransformerfactory,Guangzhoupowersupplybureau,Hunanelectricitygeneratingboard,ChongqingtransformersfactoryandWuhansteel.Thissystemhastheadvantageofoperationreliableandeasytooperate.Itcanmeettheneedsofmeasurement.Asoneofthekeyitemsoftheofeight-fiveproject,thiselectricaldevicehasbeenwidelyusedforthespottestandresearchintherelatedunitinthenorth,east,centralandnorthwestpartsofChina.TheNAJFXDultrasonicpositioningsystemwhichisincludingthehighperformancecomputer,high-sensitivitylocaldischargesoundprobe,programmedamplifiedfilter,high-speedA/Dtransducer,transientw***eformrecording,signalanalysisandfaultlocationsoftwareisappliedforacquiring,measuring,analyzing,positioningandspotobservingthelocaldischargeultrasonicsignalinthelarge-sizedtransformer,oil-immersedhighvoltageelectricalapparatusandtheGISelectricaloperationequipment.TheNAJFXDultrasonicpositioningsystemcanpositionthefaultandtheerrorislessthan250mm.Thewholemeasuringsystemcanfindoutthelocaldischargeultrasonicsignalwhichislessthan1000pC.Functi***andcharacteristics:(1)Makingthedetectingoperationoflocaldischargeultrasonicmoreconvenientandtheanalyzingmoresimpleundertheplatformofthewindows.(2)Makingthesignalacquiredmorereliablyfortheultrasonicsensorhastheperformanceoflownoise,high-sensitivityandanti-jamming.(3)Makingthespottestingmoreflexiblewiththelocaldischargeultrasonicsignalelectrical-acousticalpositionandacoustical-acousticalpositionfuncti***(4)Makingtheresultofthepositionmorepreciselybychoosingfreelythesphericalpositioncalculationandthehyperboloidpositioncalculationoftheultrasonicsignal.(5)Showingthepositioncoordinatesbyultrasonicprobeandthelocatingpointbysolidgeometricdrawing.(6)Convenientforbuildingthemeasuringandpositioningdatabaseforfurtheranalyzingandmanaging.(7)Bethelocaldischargeon-linedetectinginstrumentwhichisusefulfordetectingthelocalgeneratinganddeveloping.Technicalparameter:Thesensitivityoftheultrasonicprobe:-150dBA/Dconversionaccuracy:8bit&plu***n;1/2LSBSamplelength:32k/channelMinimumdetectabledischarge:＜50pC(laboratory)＜300(1000)pC(spot)Minimumpositionalerror:＜50mm(laboratory)＜250mm(spot))