Title :
Deterioration in aged XLPE cables
Author :
Nagata, T. ; Shimizu, N.
Author_Institution :
Chubu Electr. Power Co. Inc., Nagoya, Japan
Abstract :
Electrical and material characteristics of 93 aged XLPE (cross-linked polyethylene) cables removed from the field after 2~19 years of service were measured. It was confirmed that breakdown strengths under AC, DC, and impulse voltages in such cables decrease with length of service. Tan δ, which increases with length of service, shows a strong correlation with breakdown strength. Tan δ increases with carbonyl group content in the insulation layer and with maximum length of the bow-tie tree. The maximum length of the bow-tie tree also increases with length of service and shows a strong correlation with breakdown strength
Keywords :
ageing; cable insulation; cable testing; dielectric losses; electric breakdown of solids; electric strength; insulation testing; organic insulating materials; polymers; power cables; 2 to 19 yr; AC voltages; DC voltages; aged XLPE cables; bow-tie tree; breakdown strengths; carbonyl group content; impulse voltages; loss tangent; maximum length; power cable; water tree; Aging; Breakdown voltage; Crystallization; Curing; Electric breakdown; Power engineering and energy; Thermal engineering; Transmission line measurements; Trees - insulation; Underground power cables;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1992. Annual Report. Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-0565-5
DOI :
10.1109/CEIDP.1992.283153
