C. Katz et al., LOW-TEMPERATURE AGING OF XLPE AND EP INSULATED CABLES WITH VOLTAGE TRANSIENTS, IEEE transactions on power delivery, 10(1), 1995, pp. 34-42
This paper presents the interim results of tests conducted on 15 kV cr
osslinked polyethylene (XLPE) and ethylene propylene (EP) insulated ca
bles aged under identical conditions for 36 months at 30 degrees C (+/
-5 degrees C) with and without applied voltage transients. Aging volta
ges were from 1 to 2.5 times rated voltage, Failures during aging have
occurred in EP insulated cable while none have occurred in XLPE insul
ated cable. Both types of cable experienced a large drop in ac and imp
ulse voltage breakdown strength early in the aging process. There is a
n indication that voltage transients have slightly affected the ac and
impulse voltage breakdown strength and contributed to the EP cable ag
ing failures.