Abstract
Based on the slice materials of 35 kV and 110 kV XLPE cables, an experimental platform is built to study the relationship between electrical tree and PDs in XLPE with different voltage levels. There are three significant statistical characteristics of the PDs during the growth of electrical trees. The analysis of the results shows that each growth stage has certain characteristics. Different features existed between the growth of the electrical trees and the PD in the insulation of the 35 and 110 kV cables. Evident characteristics such as large spans of time and frequency were present as the electrical trees grew violently in the equivalent time-frequency diagram at every stage. These results could provide criteria for the identification of the deterioration using PD to monitor cables in service at rated voltages. The results are important for the identification of defects in cable insulation in order to provide an early warning of insulation breakdown in the cables.
Highlights
The study on the electrical trees and partial discharge of cross-linked polyethylene (XLPE) cables has been a critical issue for achieving better properties of XLPE cables [1,2,3]
The growth process of the electrical trees can be outlined as follows: the initial electrical trees expanded quickly at the early stage; stagnation-type electrical trees existed at earlymiddle stage; branches of electrical trees expanded quickly and developed into dendritic forms during the middle stage; the branched trees continued to expand throughout the entire insulation during the middle-late stage; at the late stage, the entire insulation was covered with electrical trees; and the electric breakdown of the slice occurred
A real-time system using Partial discharge (PD) was built to monitor the growth of electrical trees in the slices of 35 kV and 110 kV XLPE
Summary
The study on the electrical trees and partial discharge of cross-linked polyethylene (XLPE) cables has been a critical issue for achieving better properties of XLPE cables [1,2,3]. The breakdown of insulation in cable accessories is caused by lateral slip flash discharges between the stress cone and XLPE insulation [12, 13], as well as longitudinal dendritic discharge in XLPE insulation, which is the major form of discharge These discharges initially develop from small PD [14,15,16]. It necessitates more complete understanding of the relationship between electrical tree development and partial discharge of XLPE cables [17, 18] It is of great importance for the online diagnosis of cable defects in PD detection to provide an early warning [19]. By combining the growth of electrical trees and the characteristics of PD in actual cable insulation, this paper studied the identification of defects in the insulation in order to provide an early warning of the breakdown of the cable insulation for the first time
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
