Exploring protocols for the investigation of space charge dynamic in insulating elastomers for HVDC accessories applications

DC conductivity and space charge measurements were carried out on insulating elastomers used in HVDC accessories applications. Long time polarisation (20 days) provides additional details on the dielectric behaviour of these materials and their intrinsic properties. A link between the space charge accumulation in the bulk of the material and the premature breakdown of both elastomers was identified.