Study on insulation life of XLPE power cable for overhead distribution line
Study on insulation life of XLPE power cable for overhead distribution line
Since its inception, XLPE power cable has gradually replaced the traditional oil filled cable and oil immersed paper cable with its excellent electrical and mechanical properties. Therefore, XLPE power cable has been widely used in urban distribution network, and has been gradually applied to high voltage and ultra-high voltage power network With the popularity of XLPE power cable in power grid, the fault caused by insulation aging in cable operation has also attracted great attention
In order to regularly understand the operation status of cables and prevent accidents, the operation Department has taken measures of regular inspection, maintenance and expiration replacement This traditional measure can not fundamentally prevent the failure caused by cable insulation aging, but also bring a huge waste of human and material resources If we can understand the performance changes of XLPE power cable in time and master the remaining life of the cable, we can not only avoid the waste of resources caused by the blindness of regular inspection, maintenance and due replacement, but also fundamentally prevent the faults caused by insulation aging Therefore, the research on residual life prediction of XLPE power cable has important practical significance and application value
Based on the extensive collection of data at home and abroad, firstly, according to the actual operation of XLPE power cable, this paper makes a comprehensive and in-depth analysis on the structure, performance requirements and common failure forms of XLPE power cable; It is pointed out that insulation aging is the key factor affecting the normal service life of cables; From the perspective of chemical reaction rate theory, it is clarified that temperature is the main factor affecting the insulation aging of XLPE power cable; This paper expounds the emphases of XLPE insulated cable remaining life prediction, the key problems to be solved and the corresponding solutions
