Discharge region sensing technology of high voltage equipment based on the testing of the corona radiation field

High voltage discharge sensing through detecting corona discharge electromagnetic radiation field is an important means to evaluate the reliability and safety of high voltage equipment during operation. However, the traditional corona discharge electromagnetic field sensing method can't determine the discharge region. In this paper, the relationship between the spectral characteristics of the electromagnetic radiation produced by corona discharge and the curvature radius of the discharge region is analyzed theoretically. The modeling and Simulation of the discharge current and the radiation spectrum are given. The radiation characteristics of corona discharge are obtained. The experimental system of corona discharge radiation field is established. The radiation characteristics of the electrodes with different radius of curvature are studied, and the relationship between the curvature radius and the spectrum of electromagnetic radiation is obtained, The results show that the radiation frequency spectrum is determined by the curvature radius of the electrode. A method for determining the curvature radius of the discharge region according to the characteristics of the discharge radiation is proposed. According to the radius of curvature, the target area of the high voltage discharge is locked, so as to determine the discharge location.