105°C/140°C rated EPR insulated power cables

The excellent long-term operation and field performance of existing EPR cables under the current industry operating temperatures of 90°C normal and 130°C overload is well known. This paper describes a study for the implementation of a higher temperature rated EPR cable system including accessories up to a range of 105°C continuous service and 140°C emergency operation. The investigation has been carried out into the electrical, mechanical, and thermal behavior of the system as a function of temperature. Compatibility has been studied under higher temperature in relation to conductor filling compound and the semi-conducting stress control layer. The results indicate that insulation degradation does not occur under accelerated and elevated temperature testing, concluding that properly formulated and selected materials are both compatible and suitable for the higher temperature ratings