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Apparent DC conductivity of silicone rubber compounds

HVDC cable accessories play a significant role for the reliable operation of polymeric HVDC cable systems. The majority of materials used for HVDC cable accessories are based on EPDM or EPR compounds. However, the development and qualification tests conducted on HVDC cable systems show positive insights on the general application of silicone rubber compounds for HVDC components. For this purpose, a deeper investigation of the conduction mechanisms of silicone rubber compounds is required. Within this paper, the apparent conductivity of silicone rubber compounds under variation of electric field and temperature is studied and novel modelling aspects are presented. Besides the general conductivity dependence on electric field and temperature, the time dependent long-term behaviour under application of a dynamic temperature profile is considered. The measurement results show a positive agreement to empirical model descriptions based on thermal activated conduction extended by parameters for the modelling of time-dependent aspects. A minor and temperature-dependent electric field dependency is found for both material configurations.