Modeling of a Current Sensor with Extended Dynamic Range
Evgeniy S. Andreenkov, Sergey A. Shunaev · 2020
The paper presents the analysis of the modern current sensors characteristics and the basic requirements for them. The main disadvantages inherent in sensors of traditional designs are identified. A current sensor design is proposed to expand the range of measured currents, as well as reduce weight, dimensions and simplify installation of the device. The sensor of the proposed design was simulated in the Comsol Multiphysics software environment in order to evaluate its effectiveness. As part of the simulation, the geometric parameters of the sensor are set when installing it on the through-passage insulator, as well as the physical parameters of structural materials. The paper considers the measurement of a primary current that varies over a wide range at different positions of the sensing element relative to the current conductor. The results show that the value of the relative error does not go beyond the accuracy class 0.5S in the entire range of measured currents, and in the region of low currents (from 1% to 20% of the nominal), the values of the relative error of the model are significantly lower than the permissible value according to GOST. The results obtained confirm the efficiency of the developed design.