Research on Influence of Adjacent Phase Currents on Measurement Accuracy of TMR Sensor Arrays
In order to calculate the influence of adjacent phase currents on the accuracy of current sensors,based on the principle of current measurement by tunnel magnetoresistance(TMR)elements,an analytical ex-pression for the test conductors sensor arrays measurement error caused by adjacent phase currents in a three-phase alternating current system is proposed.Then,in the case of a three-phase current with an amplitude of 6 000 A,the influence of different factors on the measurement accuracy of the current sensors of the conductors to be tested is analyzed by analytical method and magnetic field finite element simulation.The results show that the proposed analytical expression can calculate the measurement error caused by adjacent phase currents more accurately.With the alternating current high-current scenarios,the TMR arrays are designed to mutually correct the measured current with at least 10 sensors,and the research provides theorical basis for the design and ap-plication of current sensor arrays for three-phase conductors in alternating current systems.
TMRcurrent sensoradjacent phase interferencecircular arraysanalysis of adjacent phase error
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