规格书SPT204A2013

1、· Beijing Singure Measurement & Control Tech. Co., LTD北京星格测控技术有限公司SPECIFICATION规格书Customer Name（客户名称）Description产品类型 Potential Transformer电压互感器Customer Part No参数比2mA/2mAPart Nmber型号SPT204AElectrical Specifications电气规范Mechanical Dimensions in mm同名端为对角Rated Primary Voltage Vi(V)原边电压（V）100,150

2、,220,300,380Primary Current(mA) 原边电流（mA）2Secondary Current(mA)副边电流（mA）2Dielectric withstanging Voltage(HI-pot)耐压3000 VrmsAccuracy class精度等级0.1绝缘电阻（M）500MWinding tesistance副边电阻（）110±10Mechanical Specifications机械规范CUPEncapsulant灌封EpooxyTerminals管脚4Pin*0.8Approx.Weight重量14g±2Tolerance公差（mm）&#

3、177;0.3Storage temp. -25<T<+80,Insulation resiatance Measured ResultSample No.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

4、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200k 。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

5、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400W，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

6、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。Usage Brief Introduction: SPT 204A is one of the milliampere class high accuracy current mini transformer, rated input 2 mA, rated output 2 mA, when using need transfer voltage signal into current signal, suggest use the electronic circle as below, as the picture showe

7、d, R is the current limiting resistor, no matter what is the rated input, adjust the R to the 2mA, can meet the usage. Sub-circuit is current/voltage transfer to circuit, use this when voltage output, adjust the reactive resistance showed in this picture R and r can get the rated output you need. Ca

8、pacitance CI and adjustable resistance are use to compensate phase shift. Suggest R use Vo/0.002, r use R/10, CI use approximate 65/R（F）， r use 200k. Capacitance C2 is 400-1000PF small capacitance, use to shake proof and filter. C3 can antijamming, the max number will be 400pf. The Diode is use to p

9、rotect the operational amplifier. Suggest use the OP07 series operational amplifier, use the better capability operational amplifier, can easy to reach a high accuracy and reliability. Operational amplifier power usually use +15V or +12V, can also set this according users need. Resistance R and Rs a

10、s showed in the picture require temperature priority 50 PPM, R power require have double residue. User use the recommended circle can also adjust it to form a single power model, apply to single A/D transformers input. Rated input can also choose 1mA to reduce consumption or 5 mA to cut down phase shift, nonlinearity is still precede 0.1. SPT 204 Sub if dont add an operational amplifier, but parallel connect a resistance directly let output transfer to voltage signal is also ok. But the precondition is resistance need smaller that 500R, rated output max 1V, and can sti