EPDM and Silicone Rubber (SiR) are elastomeric materials used in HVAC cable accessories due to their good mechanical and electrical properties. In this paper one EPDM and one SiR, are characterised for their electrical properties under DC constraint. Bulk DC conductivity and space charge measurements using the pulsed electroacoustic method (PEA) were carried out at different electric fields and temperatures. The electrical behaviour of silicone rubber under DC stress is found to be largely governed by space charges while this effect is more limited for EPDM.
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