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This paper is focused on the electric field computation in a cylindrical joint model whose insulation consists of two insulating layers (XLPE and EPR). The quasi-stationary regime was considered and the volume charge density (ρv) and the superficial one at the XLPE/EPR interface (ρs) were taken into account. The electrical conductivity was measured on XLPE (A), EPR (B) and XLPE/EPR (C) flat samples...
Electrification of mineral oil and pressboard during power transformers operation may lead to high energy electrical discharges and finally, to the transformers failures. This paper presents the results of a study concerning the influence of pressboard roughness and ageing condition on the mineral oil electrification. The experiments were performed on unaged and thermally aged (1000 h at T = 135 °C)...
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