规格书SPT204A-2013

BeijingSingureMeasurement&ControlTech.Co.,LTD北京星格测控技术有限公司SPECIFICATION规格书CustomerName（客户名称）Description产品类型PotentialTransformer电压互感器CustomerPartNo参数比2mA/2mAPartNmber型号SPT204AElectricalSpecifications电气规范MechanicalDimensionsinmm同名端为对角RatedPrimaryVoltageVi(V)原边电压（V）100,150,220,300,380PrimaryCurrent(mA)原边电流（mA）2SecondaryCurrent(mA)副边电流（mA）2DielectricwithstangingVoltage(HI-pot)耐压3000VrmsAccuracyclass精度等级0.1绝缘电阻（MΩ）500MΩWindingtesistance副边电阻（Ω）110±10MechanicalSpecifications机械规范CUPEncapsulant灌封EpooxyTerminals管脚4Pin*Φ0.8Approx.Weight重量14g±2Tolerance公差（mm）±0.3Storagetemp.-25℃T+80℃,InsulationresiatanceMeasuredResultSampleNo.6%10%20%100%120%1f(%)0.1280.1000.007-0.002-0.002(’)26.2624.5921.6012.0111.072f(%)0.1210.0800.077-0.037-0.037(’)33.0031.0127.7915.3014.003f(%)0.1080.0920.005-0.011-0.008(’)27.1225.6822.2211.1710.19推荐电路：使用方法简介：SPT204实际上是一款毫安级精密电流互感器，输入额定电流为2mA，额定输出电流为2mA。用户使用时需要将电压信号变换成电流信号，推荐使用电路如图所示。图中，R’是限流电阻，不论额定输入电压多大，调整R’的值，使额定输入电流为2mA，就满足使用条件。副边电路是电流/电压变换电路，当需要电压输出时采用。调整图中反馈电阻R和r的值可得到所需要的电压输出。电容C1及可调电阻r’是用来补偿相移的。建议R取Vo/0.002,r取R/10，C1取值约为65/R（µF）,r'取200kΩ。电容C2和C3是400至1000pF的小电容，用来去耦和滤波。两个反接的二极管是起保护运算放大器作用的。运算放大器视精度要求使用，推荐使用OP07系列，使用性能较好的运算放大器较容易达到较高的精度和较好的稳定性。运算放大器电源电压通常取+15V或+12V，也可根据具体情况自定。图中电阻R和R’要求精度优于1%,温度系数优于50PPM，R'的功率要求有2倍的余量。用户使用推荐电路稍加改动也可构成单电源供电模式，适用于单极性A/D转换器的输入。额定输入电流也可以选为1mA以降低功耗或5mA以减小相移，线性度仍优于0.1%。SPT204次级如不加运算放大器而直接并联一个电阻使输出变换成电压信号也是可以的。前提是电阻要小于400，输出电压最大1伏，这时仍能得到线性度优于0.1%的输出电压信号。和推荐电路比较，其影响如下：1.缩小了互感器的动态范围。2.使相移增大。UsageBriefIntroduction:SPT204Aisoneofthemilliampereclasshighaccuracycurrentminitransformer,ratedinput2mA,ratedoutput2mA,whenusingneedtransfervoltagesignalintocurrentsignal,suggestusetheelectroniccircleasbelow,asthepictureshowed,R’isthecurrentlimitingresistor,nomatterwhatistheratedinput,adjusttheR’tothe2mA,canmeettheusage.Sub-circuitiscurrent/voltagetransfertocircuit,usethiswhenvoltageoutput,adjustthereactiveresistanceshowedinthispictureRandrcangettheratedoutputyouneed.CapacitanceCIandadjustableresistanceareusetocompensatephaseshift.SuggestRuseVo/0.002,ruseR/10,CIuseapproximate65/R（μF），r’use200kΩ.CapacitanceC2is400-1000PFsmallcapacitance,usetoshakeproofandfilter.C3canantijamming,themaxnumberwillbe400pf.TheDiodeisusetoprotecttheoperationalamplifier.SuggestusetheOP07seriesoperationalamplifier,usethebettercapabilityoperationalamplifier,caneasytoreachahighaccuracyandreliability.Operationalamplifierpowerusuallyuse+15Vor+12V,canalsosetthisaccordinguser’sneed.ResistanceRandR’sasshowedinthepicturerequiretemperaturepriority50PPM,R’powerrequirehavedoubleresidue.Userusetherecommendedcirclecanalsoadjustittoformasinglepowermodel,applytosingleA/Dtransformer’sinput.Ratedinputcanalsochoose1mAtoreduceconsumptionor5mAtocutdownphaseshift,nonlinearityisstillprecede0.1.SPT204Subifdon’taddanoperationalamplifier,butparallelconnectaresistancedirectlyletoutputtransfertovoltagesignalisalsook.Butthepreconditionisresistanceneedsmallerthat500R,ratedoutputmax1V,andcanstillgetthenonlinearityprecede0.1.Comparedwithrecommendedcircle,thedifferencesareasfollow:1,shortenthetransformer’strendsrange.2,increasethephaseshift.