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一、引言直流大电流测量技术广泛应用于工业生产和科学研究:直流高压输电、金属电解、高铁机车、电动汽车等产业都需要准确测量直流大电流,以测量线路损耗、电流效率或进行安全监控;在核动力和高能物理等科学研究中,需要高准确度地测量、控制和稳定直流大电流进行科学实验。直流大电流准确、有效测量,需要可靠地溯源到国家计量基准。工业生产和科学研究中对直流电流测量的大小和准确度差异很大,电流从几百安培到几十万安培,准确度从百分之一到百万分之一;测量原理和方法也很多,包括分流器法、直流互感器法、磁位计法、核磁共振法、
I. INTRODUCTION DC large current measurement technology is widely used in industrial production and scientific research: DC high voltage transmission, metal electrolysis, high-speed railway locomotives, electric vehicles and other industries need accurate measurement of DC high current to measure line loss, current efficiency or safety monitoring In scientific research such as nuclear power and high-energy physics, it is necessary to conduct high-accuracy measurement, control and stabilization of large DC currents for scientific experiments. DC large current accurate and effective measurement, you need to reliably trace to the national measurement standards. Industrial production and scientific research on the DC current measurement of the size and accuracy vary greatly, the current from a few hundred amperes to hundreds of thousands of amperes, the accuracy of one percent to one millionth; measurement principles and methods are also many , Including shunt method, DC transformer method, magnetic potentiometer method, nuclear magnetic resonance method,