基于TMR传感器的非接触式高压直流电流测量方法

Contactless HVDC current measurement method using TMR-based sensors

提出一种能够应用于高压直流架空线现场环境中的非接触式直流电流测量方法,该方法使用一个隧道磁电阻(TMR)传感器阵列获取架空线下方地面位置的磁场,并搭配部分已知的架空线几何尺寸,从而估测架空线的电流值。通过架空线空间磁场模型验证所提方法的可行性,并分析所提方法在未知变量误差或TMR传感器自身测量误差影响下的电流测量准确度。最后,通过搭建的等比例缩小的架空线模型验证了所提方法的可行性。

A contactless DC current measurement method that can be easily applied in the on-site environ ment for HVDC overhead lines is presented.The ground-level magnetic field under the overhead line is measured by a TMR sensor array,which is combined with partially known overhead line geometry to esti mate the current of the overhead line.A space magnetic field model of overhead line is built up to verify the feasibility of the proposed method and analyze the current measuring accuracy of the proposed method under the influence of errors of unknown variables and TMR sensors.Finally,an equal scale reduction model of the overhead line is built up to verify the feasibility of the proposed method.