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In this paper, the electrical resistivity (determined with absorption/resorption currents) is used as a diagnostic factor in order to assess the mineral oil condition and to evaluate its elapsed and remaining lifetimes. Based on experimental results of thermal accelerated ageing, the lifetime values at constant temperature are calculated by the IEC and activation energy methods. The chosen end-of-life...
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...
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