零序电流互感器参数测试仪软件设计

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1、零序电流互感器参数测试仪软件设计零序电流互感器参数测试仪—软件设计摘要零序电流互感器是电流动作型漏电保护器中用来检测触电信号和漏电故障信号的检测元件，它是漏电保护器的关键部件。零序电流互感器的设计是漏电保护器设计的关键，要求能灵敏而又不失真地反映一次侧故障电流的有效值和相角信息。因此，测量零序电流互感器的性能指标显得尤为重要。本文介绍了零序电流互感器的原理以及主要参数，并在此基础上设计了零序电流互感器参数测试仪。本设计主要通过AT89S52单片机对零序电流互感器一次侧电流和二次侧电压进行交流采样计算其有效值，同时通过方波转换电路来测量一次电流和二次

2、侧电压的相位差。从而通过这些数据来检验零序电流互感器的性能指标。设计中采用了MAX197高性能A/D转换器以及快速傅立叶算法对信号进行测量、数字滤波，提高了测量交流信号的精度。采用了方波转换电路来测量两路交流信号的相位差。同时通过单片机控制继电器来控制测试电流的输入。本设计简单、实用、测量精度高，对于测量零序电流互感器的性能指标有较大应用价值。关键词：零序电流互感器；测试仪；参数测试Abstractzerosequencecurrenttransformerisusedtoexaminethesignalofshockingandleakingbr

3、eakdownintheelectricmovementleakageprotector,itisthekeycomponentoftheleakageprotector.Thezerosequencecurrenttransformerdesignisthekeyofthedesignofleakageprotector,whichrequeststhatthevirtualvalueandphraseangleinformationoftheone-timesidefaultcurrentisreflectedsensitivelywithou

4、tdistortion.Soitisveryimportanttomeasuretheperformanceofthezerosequencecurrenttransformer.Thispaperintroducestheprincipleandmainparametersofthezerosequencecurrenttransformer,anddesignsakindofparameterstestsetofzerosequencecurrenttransformerbasedonitsprincipleandparameters.This

5、designmainlycarriesontheexchangesamplingofzeroforewordcurrenttransformerone-timesideelectriccurrentandtwo-timesidevoltagetocalculateitsvirtualvaluethroughtheone-chipmachineAT89S52,andsimultaneouslyone-timeelectriccurrentandtwo-timesidevoltagephasedifferenceissurveyedthroughthe

6、square-waveswitchingcircuit.Thuswecangettheperformanceofthezerosequencecurrenttransformerthroughthesedata.Inthisdesign,thehigh-performanceA/DconverterMAX197andthefastFourieralgorithmisadoptedtosampleandmeasuretheelectricsignal,whichisabletoincreasethesurveyprecision.Thisdesign

7、usesthesquare-waveswitchingcircuittosurveythephasedifferenceoftwoexchangesignals.Meanwhile,controlsthetestelectriccurrentthroughrelaywhichiscontrolledbytheone-chipmachine.Thisdesignissimple,practical,highmeasuringaccuracy,whichwillhavetheabroadapplicationvalueregardingthesurve

8、yzeroforewordcurrenttransformerperformance.Keywords:zeroseque