Title :
Electrical properties for detection of thermal aging in XLPE cable models
Author :
Motori, Antonio ; Sandrolini, FRANCO ; Montanari, Gian Carlo ; Loggini, Mauro
Author_Institution :
Bologna Univ., Italy
Abstract :
The electrical behavior (DC conductivity and AC properties) of XLPE (cross-linked polyethylene) cable models aged under thermal stress is investigated as a function of aging time. Charging and discharging currents as well as the dielectric constant and loss factor of specimens aged at different times and temperatures were measured from 55 to 90°C and 10-2 to 105 Hz AC properties. Significant variations of DC conductivity and AC losses with aging time and temperature are pointed out. Cable models thermally aged above 100°C revealed a strong increase of DC electrical conductivity with aging time. The same behavior, i.e., increase with aging time at 100 and 130°C, is exhibited by dielectric constant and loss factor. The observed increase of electrical conductivity and dielectric losses supports the build-up of thermooxidative processes in thermally-aged specimens
Keywords :
ageing; cable insulation; dielectric losses; organic insulating materials; permittivity; polymers; thermal stresses; 100 to 130 degC; 1E-2 to 1E5 Hz; 55 to 90 degC; AC properties; DC conductivity; XLPE cable models; aging time; dielectric constant; discharging currents; electrical behavior; loss factor; thermal aging; thermal stress; thermooxidative processes; Aging; Current measurement; Dielectric constant; Dielectric loss measurement; Dielectric losses; Dielectric measurements; Polyethylene; Temperature measurement; Thermal conductivity; Thermal stresses;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172178
