Current Measurement Method of Copper Bar in Distribution Cabinet Based on Magnetoresistance Sensor

Magnetoresistance sensing technology provides a new technical means for current measurement in power system. For the copper bar of distribution cabinet, the magnetic field distribution characteristics are analyzed. A current measurement method without fixing the copper bar and sensor position is proposed. The measuring principle is discussed in detail, and a method of resisting space magnetic field interference is proposed. The simulation model is established in the MATLAB environment, and the measurement principle is simulated. The simulation results verify the correctness of the measurement principle. The factors affecting the measurement accuracy such as sensor position deviation, copper bar thickness, space interference magnetic field and so on, are simulated and analyzed. The simulation results verify the effectiveness of the proposed anti-interference method and the practicability of the measurement method.