This paper deals with the experiemental study on the correlation between the geometrical parameters of electrical tree and corresponding partial discharge(PD)characteristic parameters in the course of eletrical tree a...This paper deals with the experiemental study on the correlation between the geometrical parameters of electrical tree and corresponding partial discharge(PD)characteristic parameters in the course of eletrical tree aging within cross linked polyethylene(XLPE)insulation.The electrical tree aging tests were performed on specimens removed from a section of 220 kV transmission cable.The PD macroscopic characteristic parameters were found to be significantly dependent on the corresponding geometrical parameters of eletrical tree channels in the course of aging of XLPE,and different kind of electrical tree has different characteristics,and there is obvious correlation between the type of electrical tree and the pre-applied power-frequency stress.Beside,using regression analysis,the expression of the relation between them were obtained,and from which it can be seen that there is significant nonlinear correlation between geometrical parameters of electrical tree and corresponding PD characteristic parameters in the course of aging of XLPE.Therefore,the aging degree of XLPE can be effectively evaluated by recognizing the changing regularity of the PD macroscopic characteristic parameters.展开更多
基金Supported by the National Natural Science Foundation of China(59677018)
文摘This paper deals with the experiemental study on the correlation between the geometrical parameters of electrical tree and corresponding partial discharge(PD)characteristic parameters in the course of eletrical tree aging within cross linked polyethylene(XLPE)insulation.The electrical tree aging tests were performed on specimens removed from a section of 220 kV transmission cable.The PD macroscopic characteristic parameters were found to be significantly dependent on the corresponding geometrical parameters of eletrical tree channels in the course of aging of XLPE,and different kind of electrical tree has different characteristics,and there is obvious correlation between the type of electrical tree and the pre-applied power-frequency stress.Beside,using regression analysis,the expression of the relation between them were obtained,and from which it can be seen that there is significant nonlinear correlation between geometrical parameters of electrical tree and corresponding PD characteristic parameters in the course of aging of XLPE.Therefore,the aging degree of XLPE can be effectively evaluated by recognizing the changing regularity of the PD macroscopic characteristic parameters.
