The impact of vibration on the deterioration of suspended discharge in oil-paper insulation

Partial discharge is considered one of the main reasons for insulation degradation. To investigate the effect of suspended discharge on oil-paper insulation degradation under mechanical vibration, a test platform for suspended electrode-paper insulation degradation was constructed. Experimental studies were conducted under static and mechanical vibration conditions. The results showed that mechanical vibration promotes the development of discharge, alters the electrode gap, enhances the electric field intensity ahead of the electrode tip, and accelerates the degradation of oil-paper insulation. During operation, ultra-high-voltage shunt reactors experience continuous vibrations, which can lead to loosening and detachment of components, forming suspended potentials in insulating oil, thereby causing partial discharges.