论文信息 - Conduction current measurements on XLPE and EPR insulation

Conduction current measurements on XLPE and EPR insulation

Electrical conduction of crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR) is studied by means of DC charging current measurements. The threshold for space charge accumulation and the DC conductivity of XLPE and EPR have been investigated at different electric fields and at different temperatures. Current-voltage characteristics show a transition from ohmic behavior to high field behavior, above a threshold value of the applied electric field. An Arrhenius-type dependence of both XLPE and EPR conductivity with temperature was found. Measurements were performed also on two-layer XLPE/EPR combinations. Based on conductivity values obtained by measurements on a single layer sample, the electric field distribution of the two-layer combination is discussed.

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