磁调制DCCT温漂相关因素灰色关联分析

Grey correlation analysis on related factors of temperature drift in magnetic modulated DCCT

为进一步改善磁调制DCCT(Direct Current Current Transducer)的温度特性,将磁调制DCCT化整为零,利用灰色相关理论确定了DCCT各部分温度系数对整机的影响程度;同时,还提出了一种磁调制DCCT温度系数综合评价方法。根据磁调制DCCT的工作原理,把DCCT分为PCB(Printed Circuit Board)、线圈和取样电阻三部分,并分别测出DCCT整机、PCB、线圈和取样电阻的温度系数;然后,利用灰色相关理论对7个被测DCCT的各部分温度系数进行关联计算,获得相应的关联系数,从而确定DCCT温度特性的主要因素。根据DCCT温度特性的主、次要因素并结合工程实际,设定了概念DCCT作为参考,利用灰色相关理论计算出7个被测DCCT与参考DCCT的温度系数的灰色关联加权值,完成了被测磁调制DCCT温度性能的综合评价。最后,指出了降低DCCT整机温度敏感性的研究方向。

To further improve the temperature characteristics of magnetic modulation DCCT(Direct Current Current Transducer),the effects of various parts on the DCCT performance about temperature coefficient are found out by dividing the magnetic modulation DCCT into parts with grey correlation theory;at the same time,a comprehensive evaluation method of temperature coefficient of magnetic modulation DCCT is proposed.According to the working principle of magnetic modulation DCCT,DCCT is divided into three parts:printed circuit board(PCB),coil and sampling resistance.The temperature coefficients of them of the whole DCCT,PCB,coil and sampling resistance are measured respectively;then,temperature coefficient of each part of the 7 tested DCCT is calculated by using the grey correlation theory,and the correlation coefficients between the parts are obtained.Based on factors of the temperature characteristics and actual requirements,a concept DCCT is set as the reference.Using the grey correlation theory,the temperature comprehensive evaluation of the 7 tested magnetic modulation DCCTs is provided.The results provide a direction to reduce the temperature sensitivity of DCCT.