Electrical Degradation of High Voltage Cable Insulation Energized by Switching Impulses

Abstract

The electrical degradation of cable insulation in distribution lines is due to the electrical stress caused by switching surges. During the operation, the insulation of power cables will be placed under high electrical stress, including overvoltages caused by switching. The status of power cable insulation aging is evaluated by the measurement of partial discharge level and AC breakdown voltage. The study helps to determine the reliability of power cables, as well as an estimation of the cable's expected lifetime. Many other factors than aging by switching surges have to be also considered as effect of the electrical insulation degradation.

Tools and dielectric requirements for the design of marine cabling systems

“…The power cables need to endure the threats from electrical, mechanical, and thermal stress [10][11][12]. All of these stresses will initiate the change of properties of cable insulation materials, resulting in the deterioration of cable insulation [13][14].…”

“…Ambient temperature during the experiment was maintained at 20˚C. In the experiment, the cable samples were aged by the specific number of impulses [8][9][10][11][12]. [7].…”