Jasem Mohammed, S. Refaat, H. Abu-Rub, M. Olesz, J. Guzinski
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The Impact of Thermal Stresses on Volume Resistivity: Performance Comparison between TR-XLPE and XLPE Cables
Most failures in electric power cables are attributed to the development of water trees inside the insulating materials. Thus, the development and utilization of Tree Retardant Cross-Linked Polyethylene (TR-XLPE) based cables have recently been given great attention to overcome the treeing issues. TR-XLPE cables use low-density polyethylene compounds suppressing the formation of water trees while retaining excellent electrical, physical, and processing attributes. This paper investigates and analyzes the impact of thermal stress on a 33kV three-core power cable with TR-XLPE and XLPE insulations in the presence of different types, shapes and sizes of voids. The results have been obtained after 500 hours of the accelerated aging test. The obtained results confirm the superiority of TR-XLPE over XLPE cables in terms of retaining higher volume resistivity. Results obtained from simulations conclude that TR-XLPE insulated cable retains 6% more dielectric strength when compared to XLPE insulated cable.
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