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Cross-linked polyethylene(XLPE) is widely used as the insulation of power cables due to its good properties. Nevertheless, some inevitable defects like cracks and cavities existing in cables will initiate electrical trees which is one of the main reason leading to the breakdown of cable insulation. Thus, it is necessary to conduct the study on the effects of cavity on the growth of electrical trees...
Ethylene propylene rubber (EPR) with outstanding high temperature performance has been widely used as cable insulation. To understand the influence of temperature on the feature of EPR, a series of study has been conducted including the dielectric measurements, the breakdown voltage and PD behavior of cavities. In the experiments, the dependency of permittivity, conductivity and electric modulus on...
Cavities are one of the typical defects resulting in partial discharges (PDs) in extruded power cables. This paper focuses on studying the PD characteristics of arbitrary dielectric bounded cavities and electrode bounded cavities embedded in EPR insulation, such as PD distribution, PD inception and extinction voltage, under different type of testing voltage. During the experiment, the applied voltage...
Cavities are one of the typical defects leading to the degradation of Ethylene Propylene Rubber (EPR) insulation in extruded power cables. It had been observed by previous experiments that ageing phenomena on the surface of dielectric bounded cavities (DBC) and electrode bounded cavities embedded in EPR insulation was different. The surface of DBC is corroded by partial discharges (PD) which leads...
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