Continuous scratches on wires are a common cause of corona, and corona is one of the important causes of power loss in the power system. First consider from the conductor itself: First, ensure that the aluminum rod is not damp. Moisture of the aluminum rod will cause the aluminum chips to stay in the working area of the drawing die hole, and all the lubricating oil cannot enter the working area, which will cause the drawn aluminum concentric wire to be uneven and not smooth. Second, ensure that the drawing oil is clean and free of moisture. In the process of drawing, the drawing oil is in a high temperature state when it enters the work area from the lubricating area. If it contains a certain amount of moisture, the lubricating oil will be diluted and the lubricating effect will be greatly reduced, resulting in wire scratches and aluminum wire breakage. Secondly, from the perspective of production, steel-cored aluminum stranded wire should pay attention to the following issues:
In the drawing process:
(1) Check whether the mold of the wire drawing machine is placed accurately.
(2) Check whether the drawing drum has grooves after friction, and whether there is line pressure phenomenon;
(3) Check whether the surface finish of the lubrication area of the drawing die meets the requirements, and whether there is blockage by aluminum chips.
In the stranding process:
(1) Check the sensitivity of the top of the spool;
(2) Check whether the tension of the spool is uniform;
(3) Check whether the single wire is slightly crimped or the wire is uneven;
(4) Check whether the single wire is in the groove of the guide wheel during twisting.