Cable insulating layer specimen cutting device and cutting method

Abstract

The invention discloses a cable insulating layer specimen cutting device and cutting method. The device comprises a blade, a fixed shaft and a fixed base, wherein the fixed shaft comprises a first assembly section and a second assembly section which are connected with each other; the first assembly section is connected with a rotating shaft of a lathe, and the second assembly section is sleeved with a cable insulating layer specimen; the fixed base is arranged on the lathe, a blade groove matched with the blade is formed in the fixed base, the blade is fixedly arranged in the blade groove, and the edge of the blade is parallel to the axial direction of the fixed shaft. Along with rotation of the cable insulating layer specimen, the blade approaches the surface of the cable insulating layer specimen and cuts along the perimeter direction of the specimen to obtain a specimen slice, so that the inner, middle and outer layers of the cable insulating layer specimen can be definitely separated, and the thicknesses of the specimen slices are good in uniformity, so that an excellent experimental basis is provided to researches on the aging mechanism of insulating layer materials with different distances from cable cores.

Description

technical field [0001] The invention relates to a cable insulation layer sample cutting device and a cutting method. Background technique [0002] After the high-voltage cable is put into operation, due to the multiple composite effects of electrical stress, mechanical stress and environmental stress, the material of the cable insulation layer will gradually begin to age, and eventually the insulation failure will lead to the occurrence of cable insulation breakdown failure. In the general research on the aging of high-voltage cross-linked polyethylene (XLPE) cable insulation materials, the preparation of the samples is limited to the use of XLPE pellets for tableting, and the thickness and smoothness of the samples are controlled by a special mold, and then the Carry out laboratory aging research, but in the laboratory aging research, due to the constraints of various factors, such as time, voltage, and environmental factors, there are certain differences between the aging ...

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Problems solved by technology

[0003] For the research on XLPE cable insulation layer samples, most of them use the traditional cutting method, that is, the cutting method parallel to the cable core. The cutting schematic diagram and the finished sample are as follows: figure 1 As shown, the traditional sample cutting method has the following disadvantages: the thickness of the obtained sample slice 1 is generally 0.5mm-2mm, the surface smoothness of the sample is limited, and there are obvious cut marks; it is difficult to be sure in the test analysis. The inner, middle and outer layers of the cable insulation can be clearly distinguished, so that it is impossible to examine the differences between different insulating layer materials due to the typical coaxial structure of XLPE insulated cables; at the same time, the traditional cutting method will cause a lot of waste of samples

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