摘 要:基于隧道磁阻阵列电流传感器测量技术,文章研究一种无集磁铁芯的钳形电流表及自动平衡调整方法。将载流导体放置钳头组件内,载流导体带来的磁场会使 TRM 组产生感应电压。感应电压经过信号处理装置进行转换处理,还原成载流导体的电流数值。通过此方式,可以测量毫安培级别至 1 000 安培以上的直流或者交流电流信号,频带可达 0 ~ 100 千赫兹,同时有效降低载流导体与钳头组件相对位置带来的附加误差。
关键词:钳形电流表;无集磁铁芯;隧道磁电阻;磁场;电流;无损测量
DOI:10.19850/j.cnki.2096-4706.2022.21.012
中图分类号:TP212 文献标识码:A 文章编号:2096-4706(2022)21-0049-04
Clamp-on Ammeter of Magnetless Core and its Balance Adjustment Method
YANG Zhiling
(Uni-Trend Technology (China) Co., Ltd., Dongguan 523808, China)
Abstract: Based on the measurement technology of tunnel magnetoresistive array current sensor, this paper studies a clamp-on ammeter of magnetless core and an automatic balance adjustment method. The current-carrying conductor is placed in the clamp head assembly, and the magnetic field brought by the current-carrying conductor will induce an induced voltage in the TRM group. The induced voltage is converted by the signal processing device and deoxidized to the current value of the current-carrying conductor. In this way, it could measure DC or AC current signals from milliampere level to more than 1 000 amperes, and the frequency band could reach 0 to 100 kHz, while effectively reducing the additional error caused by the relative position of the current-carrying conductor and the clamp head assembly.
Keywords: clamp-on ammeter; magnetless core; tunnel magnetoresistance; magnetic field; current; nondestructive measurement
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作者简介:杨志凌(1984—),男,汉族,江西赣州人,中级工程师,硕士,研究方向:电子电工测试仪器仪表。