EPRI ߞManufacturers 500/550 kV cable research project cable A ߞEffect of increased conductor temperature

The original ERC - Manufacturers, 500/550 kV Cable Research test schedule was successfully completed [1] in August 1972 and most of the basic data has been presented [2]. A follow-on program designed to search for end-points has run its course and it is now appropriate to describe the events and consider their significance in EHV system design. Cyclic thermal loading has been postulated as a cause of EHV Cable system problems. This paper relates specifically to test specimen A and its performance in a high thermal load study at the Waltz Mill test facility [3]. The end point was reached but the failure mode appeared to be one of mechanical origin and will require further tests.