Investigation on dielectric breakdown behavior of thermally aged cross-linked polyethylene cable insulation

Publication date: Available online 5 September 2019Source: Polymer TestingAuthor(s): Chonung Kim, Pingkai Jiang, Fei Liu, Songchol Hyon, Myong-guang Ri, Yongmyong Yu, Myongsong HoAbstractWith the rapid development of industry and the increasing demand of power supply, the rated voltage class and current-carrying capacity of power cables become higher and higher, causing the severer service and testing conditions for high voltage (HV) power cables. Therefore, the requirement of the quality of cable insulating materials also becomes increasingly higher. The dielectric breakdown strength is one of the most important indices characterizing the quality and present status of insulating materials, and insulating materials and systems undergo dielectric breakdown tests during development and service. A lot of research results on the dielectric breakdown characterization of polyethylene (PE) and cross-linked polyethylene (XLPE) have been reported up to now, however, few systematic investigations about the dielectric breakdown behaviors of the thermally-aged XLPE cable insulation have been reported in details. Generally, the behaviors of dielectric breakdown for HV insulating materials and structures have been known to obey some statistical distributions, including the Weibull statistical distribution. The changes of the parameters characterizing the Weibull statistical distribution, e.g. the scale and shape parameters may be closely related with those of the physical and chemical prop...

Source: Polymer Testing - September 6, 2019 Category: Chemistry Source Type: research