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Ethylene Propylene Rubber (EPR) has been used as the insulation for polymeric power cables for its good dielectric properties. For the typical medium voltage EPR cables, the designing electrical stress should not exceed 5 kV/mm under normal operational conditions. The majority of the EPR cables have a maximum working temperature of 105 °C with the capability of working at 140 °C for short-time period...
In this paper, combined with the methods of real-time microscopic digital imaging and partial discharge (PD) continuous measurements, the effect of temperature on electrical tree propagation and PDs characteristics in XLPE cable insulation was investigated using an embedded needle electrode arrangement over a range of applied voltages from 9 to 15 kV rms. The temperature of the experiments varied...
Due to high dielectric strength, high resistance to water treeing, and thermal stability, the Ethylene Propylene Rubber (EPR) is an excellent choice for polymeric cable insulation. As for its higher dissipation factor, the usage of EPR materials for power cable insulation is limited to 154 kV. For the typical medium voltage EPR cables, the designed operational electrical stress does not exceed 5 kV/mm...
Electrical aging of polymer insulated power cables has been an important subject of investigation in the last several decades. Cable insulation is placed under heavy electrical stress due to overvoltages occurring during switching operations taking place in the power system. Transients overriding the normal ac operation voltage are some of the most hazardous conditions for cable insulation life. Although...
Aging phenomenon of polymeric power cables have been extensively studied during last several decades. Despite the great achievement in single aging mechanism, much less was known about the aging phenomenon of cables under multi-stress conditions. This study focused on the electrical aging of 15 kV Ethylene Propylene Rubber (EPR) power cables aged by switching impulses superimposed with ac voltage...
Medium voltage power cables are manufactured with various insulating materials. Ethylene Propylene Rubber (EPR) is one of the most common materials used in cable insulation among them. It is known that power cables in service are subjected to moisture due to wet environment which may reach the insulation and accelerate environmental aging of insulation. In the experiments set for this study, the accelerated...
Ethylene Propylene Rubber (EPR) is one of the most common polymeric materials used in medium voltage power cable insulation. It is generally accepted that the cables will encounter electric stress, thermal stress and environmental stress during their service lives. All of the stresses will activate changes in the bulk properties of insulation materials, known as electrical aging, which will lead to...
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