Research on AC Electric Field Measurement Based on Equipotential Ring Structure

To better address the transformation requirements of current distribution networks, this paper proposes an AC electric field sensor based on an equipotential ring structure. This design effectively mitigates edge effects, thereby enhancing signal stability and measurement accuracy. Additionally, it features low cost, strong adaptability to diverse installation environments, and ease of maintenance. The study began with a theoretical analysis of the proposed method, followed by a feasibility validation of the designed probe through simulation. Subsequently, the back-end processing circuit for the sensor was meticulously designed. Finally, the prototype's accuracy was rigorously evaluated. Test results demonstrate that the sensor exhibits excellent linearity in electric field measurements, with a linear fitting coefficient of 0.9998, a maximum relative error of the output voltage compared to the fitting curve of 0.24%.