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1、第44卷第504期电测与仪表Vol.44No.5042007年第12期ElectricalMeasurement&InstrumentationDec.2007电缆外护层接地电流校准及不确定度评定*江翼1,冯振新1,周玮3,曹文彬2,付济良3,王先培2(1.国网电力科学研究院武汉南瑞有限责任公司,武汉430074;2.武汉大学电子信息学院,武汉430072;3.中国电力科学研究院有限公司,武汉430074)摘要:针对传统电缆外护层接地电流监测仪的校准过程主要在实验室参比条件下,未考虑到现场环境中存在背景泄漏电流的干扰,提出了一种基于零磁通原理与置空后注入标准信号相结
2、合的在线校准方法。在不断电和不拆卸相关设备的情况下消除了背景泄漏电流对校准过程的影响,对监测仪校准结果的不确定度进行详细分析和评定,基于监测仪的工作原理和测试方法,通过传递比较法,验证了校准结果的可信度和不确定度的合理性。关键词:带电检测;电缆外护层;接地电流;校准方法;不确定度;量值传递中图分类号:TM472文献标识码:A文章编号:1001-1390(2018)00-0000-00GroundcurrentcalibrationanduncertaintyevaluationofoutercableoutersheathJiangYi1,FengZhenxin1,
3、ZhouWei3,CaoWenbin2,FuJiliang3,WangXianpei2(1.WuhanNARILimitedLiabilitycompanyCompanyofStateGridElectricPowerResearchInstitute,Wuhan430074,China;.2.SchoolofElectronicInformation,WuhanUniversity,Wuhan430072China.;3.ChinaElectricPowerResearchInstituteCo.,Ltd.,Wuhan430074,China)Abstract:A
4、imingatthetraditionalcalibrationprocessofgroundingcurrentmonitorforoutercableoutersheathing,theinterferenceofbackgroundleakagecurrentinfieldenvironmentisnotconsideredunderthelaboratoryreferenceconditions.ATheon-linecalibrationmethodbasedonthecombinationofzero-fluxprincipleandspace-Afte
5、raftertheinjectionofastandardsignalcombinationofisproposedinthispaperon-linecalibrationmethod,withoutremovingtherelevantequipment,thebackgroundleakagecurrenttoeliminateandtheimpactofthebackgroundleakagecurrentonthecalibrationprocessiseliminatedwithoutremovingtherelevantequipment,adetai
6、ledanalysisandassessmentisconductedontheuncertaintyofthemonitorcalibrationresultsofthemonitor.theuncertaintyofadetailedanalysisandassessmentbasedBasedonmonitoringTheworkingprincipleandtestingmethodofthemonitor,instrumentverifytherationalityofthecredibilityanduncertaintyofthecalibration
7、resultareverifiedthroughthemethodofpassingcomparison.Keywords:chargeddetection,cableoutersheathing,groundcurrent,calibrationmethod,uncertaintymeasurement,valuetransfer-1-第44卷第504期电测与仪表Vol.44No.5042007年第12期ElectricalMeasurement&InstrumentationDec.20070 引言随着城市的发展,大量单芯电缆的运行导致电缆的负荷日益增大。国