A qualifiedASTM 477 MCM ACSR Cableneeds strict control at every step from raw material selection, transportation, storage, to cable production, to testing, and the quality defect testing of some ACSR cables is tricky. , Now let’s introduce the exclusion methods of 7 common unqualified defects of wire and cable.
1. It is the degree of cross-linking, which is often referred to as thermal extension. This is a very important performance of the cable, because if the degree of cross-linking of the cable is unqualified, the working performance of the cable at high temperature will be greatly affected. There are generally two reasons for the qualification. One is that the formula is unqualified and needs to be adjusted and handled. The other is the problem of the vulcanization process. The reason must be clarified when handling.
2. The structural appearance of the cable is unqualified. This situation is often due to improper mold selection during the production process and the problem of machine setting coefficients. The solution is to adjust the machine speed and other parameters, and then select the appropriate size mold.
3. TheACSR cable is in the shape of a bamboo joint. The general reason for this situation is electrical, and the speed is unstable caused by the machine. The solution is to check the machine and the electrical system and remove the obstacles.
4. The appearance of the cable is scratched. This situation is usually caused by the cable being touched in the vulcanizing tube, so the solution is to adjust the suspension.
5. Impurities are mixed into the insulating materials. These are usually entered when the materials are mixed, so the only way is to strictly require the production process, and pay attention to cleanliness to avoid mixing of impurities.
6. Air bubbles appear in the insulation, one of which is formed during extrusion. The solution is to select an appropriate mold. There are bubbles in the shielding layer. The first reason is that there is moisture, and it should be dry before extrusion. The second is insufficient cooling. At this time, it will appear as follows: a circle of bubbles appears on the circumference equidistant from the core. The cleaning method is to strengthen cooling, raise the water level and lower the temperature of the cooling water.
7. ACSR cable insulation breakdown, the cable insulation is easily broken down. The first reason is to consider whether the insulation is mixed with impurities and affect its resistivity. The solution is still to strictly require the production process to avoid the mixing of impurities.g of impurities.