In the process of manufacturing cable terminals and interconnect pairs, the semiconductor shielding layer needs to be treated, which is the key to the quality of the interconnect. At this point, there will be a sudden change in field strength. If the level of processing is not high, the insulation will be damaged during the debugging process, and in severe cases, faults may occur during the completion test.
Test the quality of the cable upon arrival, including routine testing of the cable and routine testing of the testing center.
Test structural dimensions; The direct current resistance of a conductor; Thermal expansion of insulation; If there are special requirements, it is also necessary to conduct bundled fire tests on the cables.
Cable core, cross-linked cable, cable insulation material
Routine testing of cables in the testing center
Check the structural dimensions. Check whether the materials, structure, diameter, eccentricity, thickness, etc. of each part of the cable meet the standards.
Direct current resistance of conductor: Check the material and cross-section of the cable core. By converting the direct current resistance, check whether the physical cross-sectional area of the wire core meets the standard, and also check whether the surface of the wire core is damp or oxidized.
Insulation thermal strain test: used to inspect cross-linked polyethylene insulation materials, check the degree of cross-linking of cable main insulation, in order to check the quality of insulation raw materials and whether the cross-linking process meets the standards. The thermal expansion failure of the insulation layer reflects the poor insulation performance of the finished cable, which may lead to accelerated aging and deformation failure of the cable during long-term operation.
The influence of moisture on cable insulation
During the production process of cross-linked cables, the insulation material contains water molecules. Under the influence of electric field and temperature, water branches are formed during long-term operation, which continuously grow and migrate, gradually developing into air gaps, forming discharge and damaging insulation.
In addition, after the formation of the outer sheath, the cable is damaged in water, and the moisture existing outside the cable core and insulation layer will also reduce the insulation performance of the cable, forming a drainage channel. During the construction process, it is important to protect the inner and outer sheaths to prevent water from entering the wire core.
The influence of temperature on cable insulation
The performance of cable insulation materials is closely related to temperature. With the increase of temperature, the insulation performance decreases, the insulation resistance decreases, the breakdown field strength decreases, and the insulation layer accelerates aging. Exceeding the working temperature can also cause cable deformation, multiple changes in field strength distribution, and seriously lead to thermal breakdown. Therefore, it is necessary to strictly control the working temperature of the cable and not allow it to work under overload
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