Emergency Overioad Characteristics Of Extruded Dielectric Cables Operating At 1300 And Above

This paper addresses overload characteristics of thermoset dielectric power cable systems. Present industry specificationsl, 2 recommend a maximum emergency conductor temperature of 130°C. The suitability of this temperature and the time it is to be maintained has been questioned. The present work indicates that crosslinked polyethylene (XLPE) and ethylene propylene (referred to as EPR in this paper) insulated cables are suitable for emergency operation during extended periods at 130°C and may be suitable up to 145°C, provided semiconducting shield and jacket materials are used that do not decompose at these temperatures. The work was performed on new cables, without prior field aging.