Structural Performance Improvement of Synthetic Electric Field Sensors

In order to improve the measurement stability and consistency of the field-mill electric field sensor, a sensor structure with low coupling and reduced electric field distortion is designed. A three-dimensional electric field model is established in the finite element simulation software, and simulation analysis is done on the key parameters of the structure such as shell wall-blade height difference and blade margin to determine the optimal parameter selection results. And for the problems of unstable outdoor operation and complicated structural assembly of the sensor, the integrated rotary shaft structure and waterproof drainage table are designed to extend the service life of the sensor. Based on the above optimization scheme, the sensor prototype of different metal materials is prepared and the electric field measurement experiment is carried out in the standard calibration device. The experimental results show that the sensor designed in this paper has strong linearity and high sensitivity, and is able to accurately and rapidly measure the synthetic electric field strength on the outdoor ground.

I. Introduction

With the development of electric power construction and the extensive laying of high-voltage transmission lines, the electric field environment of transmission line engineering has been concerned, and the demand for mechatronic products for ground synthetic electric field measurement has increased dramatically [1]. When the corona discharge occurs in the transmission line, the synthetic electric field of the DC high-voltage transmission line will produce sudden changes, resulting in power loss, audible noise and other adverse effects [2], [3]. In order to ensure that the operation of the power system complies with the national electromagnetic environmental standards, a stable and accurate means of detecting the synthetic electric field environment on the ground of high-voltage circuits needs to be proposed.