用直测法检验电流电压变换器误差的基本限制  

The fundamental limitation of testing error of current and voltage transducer by direct measurement method

作　　者：郭来祥 

机构地区：[1]东莞(台湾)仟佰电机有限公司,广东东莞511700

出　　处：《电测与仪表》2007年第7期1-7,共7页Electrical Measurement & Instrumentation

摘　　要：本文用误差累积的观点评价了目前广为流传的校验电流电压变换器误差的直测法:用直测法时被测电流或电压总是难以达到数字电压表或电流表的满度值,因此很多情况下都得不到预期的精确的校准结果。特别是电流输出型的变换器,有时额定输出电流仅为1～2mA。即便额定输出电流为5mA,使用Keithley2000型高精度数字电压表,用直测法也不可能校准0.1级、0.2级电流或电压变换器,因此用直测法不能达到校验的目的。最后指出,检定机关不可用直测法作为检验包括I-I、I-U、U-U与U-I各类变换器在内的电流或电压变换器误差的仲裁手段。Direct measurement method, the prevalent way of testing error of current and voltage transducer in the relays and protection trade was appraised from a error accumulation viewpoint in this paper. The undertest current or voltage always will be hard to approach the full-scale value of the digital voltage or ampere meter using direct measurement method . For this reason it couldn＇t obtain the recision calibration result expected in many cases. Espe-0.1or 0.2 class current or voltage transducer by mean of direct measurement method. Lastly, ought to point out, the verification institution cannot take the direct measurement method as the arbitration means for testing error of the current and voltage transducer including I-I.,I- U.,U-V and U-I transducers of different kinds.

关 键 词：直测法 电流变换器 电压变换器 误差 

分 类 号：TM45[电气工程—电器]