Rejuvenation Addresses Partial Discharge in Power Cables

Rejuvenation of power cables addresses water trees, voids, or electrical trees. Partial discharge (PD) in joints or terminations are addressed by the sustained pressure rejuvenation process, which replaces all terminations and joints. In this study, partial discharge inception voltage (PDIV) is found to increase by 27% for each 0.1%w in crease in fluid concentration in field-aged rejuvenated cable samples. The mechanism of rejuvenation is discussed in which PD mechanism is prevented by plasticizing the dielectric, filling the voids, smoothing electrical stress, and sequestering free electrons in field-aged cables.