Although the production process of XLPE cable is simple, it has high requirements on process parameters, temperature, pressure and time, and has strict requirements on purification of production environment and purity of raw materials. Since the electrical performance of XLPE cables is very good, in order to verify the quality of the products in the production process and ensure the safety margin of cable use, effective testing items and corresponding technical indicators must be available.
The eccentricity characterizes the roundness of the cable and reflects the level of control technology of the cable during the vulcanization process. Most of the cable laying is directly buried. When the cable enters the water, the electrode potential difference will be formed, which will cause galvanic corrosion of the copper shielding layer. XLPE insulation will produce water trees under the action of water and electric field, and need to be lined after the outer sheath is damaged. The layer acts as a water barrier to prevent further deepening of the XLPE insulation.
Since the micropores, impurities and protrusions inside the insulation are subjected to external application voltage, discharge and partial breakdown will be formed, so that the partial discharge amount can determine the advantages and disadvantages of the cable raw material and the extrusion process control, and examine the internal defects of the cable insulation. It is a relatively important test in electrical tests.
The same power frequency withstand voltage test voltage, for the same size of micropores, impurities and the surface of the inner semiconducting layer, the first end of the breakdown is the defect micropores caused by the convex end of the inner semiconducting layer surface, again impurities. It can be seen that the power frequency withstand voltage has a strong destructive effect on cables with serious protrusions, micropores and impurity defects. From the partial discharge and the power frequency withstand voltage, it can be detected that the electrical standard of the cable is unqualified due to defects of a certain size and number of micropores, impurities and protrusions. The peel force has a great relationship with the peelable semiconductive shielding material.
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MATERIAL: Stainless Steel with Heavy Galvanized and hard plastic
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