In carrying on the XLPE insulating power cable performance testing, prior to the end of the cable, cable the higher voltage class, this kind of treatment, the more strict, described.properties of medium voltage cable, to the end of the cable outer semiconductive layer is needed for a certain length cutting, but it has changed the distribution of the electric field of cable end, details are as follows:
(1) electric field concentrated cable end shield to cut off the place, is in the operation of the cable test and breakdown of the weak links.
(2) attached along the axial electric field on the surface of the insulation, exists along the discharge phenomenon on the surface of the insulation.
Crosslinking cable ends after the above processing, such as in the test, not with the appropriate test terminal to reinforce improving weaknesses, elimination of the influence of the end surface of the leakage, and direct to dc withstand voltage and leakage current test, it is easy to produce incorrect results, misjudgment cable laying installation or quality problems in the manufacturing process.
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