Study On The Electric Field Distribution Of XLPE-silicon Rubber And Tracking Failure

With excellent electric and mechanical properties, XLPE cables lines are widely used in the transmission. Meanwhile, the fault happens constantly, mainly focused on the joint of XLPE cable with Silicon rubber joints. Therefore, as the weakest insulation place for transmission lines, studying on the tracking failure characteristics of the cross-linked polyethylene and rubber interface is very important.Interface defects is an important factor which causes distortion of interface electric field strength. Uneven distribution of interface electric field is the mainly reason causing interface discharging. During installation of the cable connector, to burnish the XLPE insulation, make different degrees of rough areas between interfaces. Installing and strip-cutting process may cause scratches to the main insulation or involvement conductive debris. Air gap-type defects in this article is one state of the interface, including interfaces roughness and scratched;Grease as well as conductive debris in the interface belonging to the other case, collectively referred to as content.Discharge breakdown on the interface will generate light and heat phenomena. With the development of interface channel, tracking failure will generate corresponding carbonization distribution. Every interface status has its corresponding electric field and tracking failure characteristics. For XLPE-SIR two dielectric interfaces’ tracking failure in this article, we’ll study on electric field distribution and tracking failure of the interface,designing and constructing the experiment platform, making a detailed comparison and summary for development of the discharge channel of the non-destructive interface. At the same time, I have collected the development process of discharging channel and carbonization distribution with different defects and contents of the interface.According to different interfaces, respectively, I have designed corresponding simulation models and obtained electric field strength distribution mainly with cross-linked polyethylene on the surface by using Ansoft software modeling. Comparing discharging channel and carbonization distribution and defective interface of electric field strength distribution, effects of interface defects on electric field distribution and tracking failure characteristics have been obtained.