量子直流电能表电流传感器位置影响修正及建模

仇茹嘉; 田腾; 耿佳琪; 王恩惠; 赵龙; 陈月

仇茹嘉,田腾,耿佳琪,王恩惠,赵龙,陈月.量子直流电能表电流传感器位置影响修正及建模[J].电测与仪表,2025,62(1):20-26.
Qiu Rujia,Tian Teng,Geng Jiaqi,Wang Enhui,Zhao Long,Chen Yue.Correction and modeling of position impact of current sensor of quantum direct current electricity meter[J].Electrical Measurement & Instrumentation,2025,62(1):20-26.

量子直流电能表电流传感器位置影响修正及建模

Correction and modeling of position impact of current sensor of quantum direct current electricity meter

DOI：10.19753/j.issn1001-1390.2025.01.003

中文关键词: 量子直流电能表电流传感器位置影响误差

英文关键词:quantum DC electricity meter, TMR current sensor, error caused by changes in position

基金项目:国网安徽省电力有限公司科技项目（521205230017）

作者中文名	作者英文名	单位
仇茹嘉	Qiu Rujia	国网安徽省电力有限公司电力科学研究院
田腾	Tian Teng	国网安徽省电力有限公司电力科学研究院
耿佳琪	Geng Jiaqi	国网安徽省电力有限公司电力科学研究院
王恩惠	Wang Enhui	国网安徽省电力有限公司电力科学研究院
赵龙	Zhao Long	国网安徽省电力有限公司电力科学研究院
陈月	Chen Yue	黑龙江省电工仪器仪表工程技术研究中心有限公司

摘要点击次数: 254

中文摘要:

针对已有的隧道磁阻（tunnel magnetoresistance, TMR）传感器阵列在测量导体偏心、倾斜情况下的电流时误差明显增大，以及准确测量需要的传感器数量较多的问题，提出了利用两个三轴TMR磁传感器检测电流的方案。分析在两个位于圆周上的三轴TMR磁传感器围成的圆形范围内，长直载流导体存在倾斜和偏心情况下电流的测量原理，并推导出计算公式。然后进行实验验证，实验中最大相对误差为0.21%，出现在10%IMAX点，相对误差随着电流的增大迅速减小，但不随着载流导体偏心、倾斜情况的变化而变化，这证明该方法电流测量误差不受载流导体倾斜和偏心的影响。为了更接近应用状态，实验时减小直导线长度且两端弯曲，由于与理论推导条件不同而引起了一定的误差。为修正该误差，给出了基于最小二乘法二次和三次拟合建模方法，拟合后最大相对误差为0.074%，决定系数R2为1.000 0，均方误差(mean squared error)MSE为1.18×10-4，达到了满意的效果。总之，双三轴TMR传感器及修正方案，可以有效克服导线偏心、倾斜及导体两端弯曲等对电流测量误差的影响，为提高量子直流电能表的准确度提供了方法。。

英文摘要:

To address the issue of increased error in current measurement by existing tunnel magnetoresistance (TMR) sensor arrays due to conductor eccentricity and tilt, as well as the challenge of accurate measurement with a large number of sensors, this paper proposes a current detection scheme using two tri-axial TMR magnetic sensors. We analyze the measurement principle for current within the circular range of two three-axis TMR magnetic sensors positioned on the circumference and derive the calculation formula. Experimental results demonstrate that the maximum relative error is 0.21% at 10%IMAX point. The relative error decreases rapidly with increasing current but remains unaffected by changes in conductor eccentricity and inclination, confirming that current measurement accuracy of this method is not influenced by these factors. In order to simulate real-world conditions more closely, we reduce the length of straight wire and bend both ends during experimentation, which introduces some errors due to the different conditions from the theoretical derivation. To correct these errors, we present a modeling method based on least squares quadratic and cubic fitting techniques. After fitting, the maximum relative error is reduced to 0.074%, with a coefficient of determination R2 equaling 1.000 0 and an MSE value of 1.18×10-4, achieving satisfactory results overall. In conclusion, utilizing double tri-axial TMR sensors along with our correction scheme effectively mitigates any impact from wire eccentricity, tilt, or bending on end-to-end current measurement errors while providing a way to enhance quantum DC electricity meter accuracy.

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