Abstract
In order to further study the effect of different degree of acidity and alkalinity on cable insulation aging, the aging condition of cable insulation was compared and analyzed under different pH values. The samples of cable insulation material slice and short cable were carried out the accelerated aging test, which were placed in the conditions of different pH values. And then the test results of micro morphology and electrical properties between the different samples were compared and analyzed after aging. According to the test results in this paper, the micro morphology of the cable insulation material slice would change differently under the aging conditions of different acidity and alkalinity, which indicated that the degree of oxidation degradation of insulation material aging was different from the different acidity and alkalinity conditions. In addition, both acid or alkaline environment would accelerate the aging of cable insulation and reduce the service life of cable, while strong acid and strong alkaline environment are more conducive to the formation of interpenetrating water tree in cable insulation material and cause the operation accident of power cable. Furthermore, the test results of electrical properties of short cable samples after aging showed that the aging degree of short cable samples was more serious in alkaline environment, and the decline of electrical properties was faster.
Highlights
Because of the good mechanical and electrical properties of cross-linked polyethylene (XLPE), the XLPE power cables are widely used in medium and low voltage transmission lines in China
In order to study the influence of environmental pH value on cable insulation performance, the YJLV223×95 8.7/15kV XLPE cable was selected to carry out artificial accelerated aging test
The slices were dyed in methylene blue solution at 90°C for 30min, and the (b) pH=9 (d) pH=13 Fig.3 Morphology of the water tree in XLPE slice
Summary
Because of the good mechanical and electrical properties of cross-linked polyethylene (XLPE), the XLPE power cables are widely used in medium and low voltage transmission lines in China. It is of great significance to study the influence of cable operation environment on cable insulation aging. A large number of documents have clarified that contact with electrolytic ions contained in the dielectric is one of the important influencing factors of cable insulation aging when the cable is running[6,7,8]. It is of great significance to study the influence of acid-base environment on the insulation performance of cables. The accelerated aging experiments of cable insulation material and power cable sample were carried out under different acid-base condition. Based on the experimental results, the aging degree of insulating material under different acid-base conditions was analyzed. The influence of different acid-base environment on cable operation was discussed
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