Simulation Optimization of Optical Conductivity Structure Parameters for GIS Partial Discharge Detection

This paper presents a simulation-based optimization study of optical fiber structure parameters for partial discharge (PD) detection in Gas-Insulated Systems (GIS). Partial discharge, a localized breakdown phenomenon within insulating materials, offers unique advantages in analyzing discharge characteristics and understanding the principles of insulation degradation in power equipment. Using TracePro simulation software, we modeled the optical fiber structure within a Type-I GIS cavity. The study investigates the effects of the front-end shape, radius, and detection window size of the optical fiber on the propagation and detection capabilities of optical signals. The results indicate that concave-structured optical fibers outperform convex ones in light guiding efficiency, with the 30° wedge and 60° double-wedge structures showing the best performance, enhancing the guiding effect by 37.6% and 30.7%, respectively. Furthermore, increasing the radius of the optical fiber improves light guiding efficiency, with a 10mm radius yielding optimal results. Similarly, enlarging the detection window size enhances optical signal detection. When the window radius (R) exceeds 21.4mm, the light guiding efficiency of both the 30° wedge and 60° double-wedge optical fibers surpasses that of the planar optical fiber. This study provides specific design recommendations for optimizing optical detection of PD in GIS, aiming to achieve optimal detection performance in practical applications.