Moisture-induced Discharge Evolution Analysis of XLPE-SiR Insulation Interface in 10 kV Cable Joints
The discharge behavior of the XLPE-SiR insulation interface in 10 kV cable joints under moist conditions significantly impacts the reliability of the distribution networks.However,research on the development and characteristics of insulation interface discharge behavior is scarce.Therefore,this study investigates the discharge behavior of the XLPE-SiR insulation interface in 10 kV cable joints under moist conditions and validates the breakdown process of the XLPE-SiR insulation interface through simulation and experiments.The results indicate that under the influence of moisture,the XLPE-SiR insulation interface exhibits partial discharge,evolving gradually into arc discharge.Discharge has two main effects,one is causing thermal decomposition of the insulation material,forming electrical tracks,and the heat generated by discharge leads to water evaporation,effectively preventing further discharge at the insulation interface.Subsequently,with the presence of electrical tracks,the paper further studies the discharge behavior of the XLPE-SiR insulation interface.The findings demonstrate that when electrical tracks are present on the XLPE-SiR insulation interface,the presence of moisture rapidly leads to breakdown of the insulation interface.The moisture content directly determines the development process of insulation interface discharge-short circuit faults in 10 kV cable joints,emphasizing the need to strengthen waterproof management in the production and construction processes of actual cable joints.
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