Abstract:

Investigating the discharge patterns and detection methodologies for rod-to-plate gap discharges within spatially constrained power equipment, such as switchgear, is critically important. The study delved into the distribution of discharge spectra within a "rod electrode-insulating barrier-ground electrode" system across various barrier materials and positions. Utilizing a surface potentiometer, the study analyzed the distribution characteristics of trap energy levels on the insulating barrier's surface post-discharge. A simulation model of an insulating system of identical dimensions was established to examine the influence of introducing an insulating barrier on electron density and electric field distribution, thereby elucidating the discharge mechanism. The research findings indicate that incorporating an insulating barrier significantly elevates the system's breakdown voltage, with a potential increase of up to 1.6 times. Discharge spectral characteristics vary with the barrier material; while epoxy resin barriers exhibit higher overall discharge spectral intensities, polyester boards show slightly greater intensities at wavelengths of 309.25 nm and 589.05 nm. Moreover, the spacing between electrodes markedly affects the discharge spectrum, with a clear presence of residual charge on the barrier surfaces. Epoxy resin demonstrates higher charge accumulation compared to polyester, impacting breakdown voltage more substantially. Simulation results further reveal that alterations in barrier materials not only affect the amplitude of the breakdown voltage but also modify the physical motion of micro-particles, consequently altering the discharge spectrum. This research provides theoretical and practical guidance for spectral discharge monitoring and insulation condition assessment within electrical equipment.

Key words: air gap, insulation barrier, spectral characteristics, residual charge, simulation