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Cross-linked polyethylene (XLPE) has been widely used as insulating material in power cable. Electrical tree formed within the XLPE has been considered as an important reason for the accelerated ageing and early breakdown of the insulation. From the viewpoint of safety, it is very necessary to gain a firm understanding of the nature of electrical treeing phenomena. In this paper, XLPE has been employed...
This paper presents study aimed at clarifying the effect of magnetic field on electrical tree propagation in cross-linked polyethylene (XLPE) cable insulation. By adding dicumyl peroxide (DCP) as cross-linking agent into low density polyethylene (LDPE), the test samples are made at cross-linking temperature (CT) ranged from 150 °C to 180 °C. The dimension of the sample is 20 mm × 20 mm × 4 mm. A pair...
This paper presents study aimed at understanding the effect of defect size on characteristics of partial discharge (PD) pulse measured with high frequency current transformer (HFCT) in XLPE insulation. Four typical defects are established to introduce internal, surface, corona and floating discharges, the dimensions of the defects are varied in a certain range. The experiment is carried out at room...
The effect of interfacial pressure on the insulation breakdown of the interface between a piece of XLPE and a piece of silicon rubber was investigated. A pair of plate-needle electrodes was sandwiched at the interface. A uniformly distributed weight was put on the sample with the interfacial pressure from 20 kN/cm2 to 300 kN/cm2. The breakdown voltage and the discharge current were recorded; the light...
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