Effect Of Cross-linking Temperature On The Behavior Of Space Charge In XLPE Power Cable Insulation

In recent years, electrical industry experienced a huge advance with socialdevelopment and the progress of urbanization. Power cables, especially XLPE cables,were universally employed in the power system thanks to their excellent performancein electrical, mechanical strength and heat resistance.With the growing amount of XLPE cables in power system, their quality andreliability count a lot for the security and stability of the system. In service, someaging phenomena will be observed in insulation layer, such as water tree andelectrical tree. All of them will lead to the accumulation of space charge in insulationlayer, which will strengthen local electric field, accelerating the aging process.Accroding to the reasons above, researching the behavior of space charge in XLPEcables is meaningful for preventing the preaging of XLPE cables.In this paper, we focus on two important factors in the manufacturing process ofXLPE cables, crossling temperature and crosslinking time. LDPE is taken as basematerial to make testing sample, with DCP working as crosslinking agent. Testingsamples are divided by crosslinking temperature and time. We establish a system foraccelerating aging experiment and space charge diagnosis. TSM method is taken todiagnosis space charge in testing samples. Finally, we figure out the effect of differentcrosslinking temperature and crosslinking time on space charge behavior in XLPEinsulation, providing data for factories and power company.The results of TSM show that the distribution of space charge in insulation willbe affected by crosslinking temperature and time. Finally, we conclude the effct ofcrosslinking temperature and time on space charge behavior in insulation of XLPE.