Influence of Cable Temperature Rise on PDC Method Test Results of Water Tree Aged Cables

Abstract

There is a certain temperature rise in the field running cable because of the load bearing. To study the influence of cable temperature rise on the polarization and depolarization current (PDC) method, 10kV XLPE short cables were accelerated aging three months by water needle electrode method, and the PDC method was used to test the new and aged cables under constant humidity. The polarization and depolarization current of the cable samples was analyzed, and the conductivity and low frequency dielectric loss spectra were obtained and inspected. The results show that: in the experiment selected test temperature, the change laws of conductivity of the new and aged cables are the same, and the conductivity gradually rose after a slight drop in 40 °C; in the dielectric loss spectrum, the polarization of the new sample is low and the polarization loss changes little with temperature, and the dielectric loss is mainly affected by the conductivity, so the test result is clearly divided into two regions. And water tree aged samples have strong polarization and are obviously affected by temperature, so their low frequency dielectric loss showed the trend of first rising and then decreasing and the maximum appeared at 60 °C.

Self-Healing Properties of Water Tree with Microcapsule/Cross-Linked Polyethylene Composite Material Based on Three-Layer Core-Shell Structure

“…Therefore, microscopic defects will also occur in the XLPE cable. Under the continuous Polymers 2024, 16, 1445 2 of 21 action of water in the surrounding environment, the tiny defects in the insulation layer are very prone to water tree aging [5,6]. Water trees in solid insulation are dendritic hairline insulation defects formed by micron-sized holes and nanometer-sized channels and are a permanent material degradation phenomenon that occurs within the insulation.…”