Modeling and Simulation of the Operating Zero Point of Voltage Sensors

Abstract

Compared to isolation amplifier voltage sensors and magnetic balance voltage sensors, magnetic modulation voltage sensors exhibit higher measurement accuracy and faster response time, and are widely used in fields such as leakage current monitoring and AC drive torque control. The verification of magnetically modulated voltage sensors mainly relies on physical experiments, which is time-consuming, labor-intensive and inefficient in design. To address this issue, this paper establishes a circuit simulation model of the magnetic core. The variations in zero offset and zero drift of the voltage sensor are analyzed under different parameters of the magnetically modulated core and mutual-inductance core, respectively, and corresponding rules are summarized. The simulation results show that zero offset is related to the voltage at the junction of the two secondary coils. The higher the voltage at this junction, the greater the current flowing to the output terminal, and the larger the zero offset. And zero drift is related to frequency, matching capacitance, and the inductance of the second magnetic core. This work can provide effective theoretical guidance for the design of high-precision magnetically modulated voltage sensors, which can greatly save time in design.