摘要
DCCT(DC current transducer)凭借其优良的性能成为直流大电流检测的关键精密设备,而传统的电流传感器线性度测量评估方法是使用更高精度级别的测量设备来完成测量、校准等工作。为了既降低DCCT线性度测试设备的要求又给出有效的线性度指标,文中分析了零磁通电流传感器的线性误差产生机制,导出了DCCT线性误差和开环增益的反比例关系,确定了一种提高DCCT线性度的方法。同时,根据DCCT的零磁通工作原理,提出一种基于开环增益的线性误差测量和估计方法。用该文提出的方法和传统的测试方法对Sinap DCCT-200A的线性度进行评估,两种方法测试结果一致,证明了该文提出的线性度测量方法的有效性,同时表明Sinap DCCT-200A的线性度优于3×10^(-6)。
With excellent performance, DCCT （DC cmTent transducer） is considered as the key device for measuring large DC cmrent. To measure the linearity of cureent measuring device in the traditional way, tes- ting devices with higher precision level are demanded for measuring and calibrating. Aiming at measuring the linearity with lower pefformance on device and conditions, this work analyzed the generating mechanism of lin- earity error of cmrent transducer with zero-flux, and deduced the inversely proportional relationship between linearity error and open-loop gain of DCCT. A method for improving the linearity of DCCT was proposed. Meanwhile, a linearity measuring and estimating method based on open-loop gain was proposed according to the working principle of DCCT with zero flux. The linearity of SinapDCCT-200A was assessed with the pro- posed linearity measuring method and traditional linearity testing method respectively. The consistent results validated the effectiveness of the proposed linearity measuring method. It also demonstrated that the linearity of SinapDCCT-200A was better than 3 ×10^-6
作者
王东兴
朱燕燕
李瑞
李德明
郭春龙
WANG Dongxing1,2, ZHU Yanyan2 , LI Rui2 , LI Deming2, GUO Chunlong2(1. University of Chinese Academy of Sciences, Beijing 100864, China; 2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, Chin)
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第3期343-348,共6页
Journal of Northwest University（Natural Science Edition）
基金
科技部国家重点研发计划资助项目(2016YFC0105402)
