Power cable crimping process - crimping
1) The selection of the position of each indentation should be carried out according to the marked position and regulations on the connecting pipe or terminal cylinder. The axial centerline of the partial crimping pit or the center of the opposite side of the inscribed circle in the hexagonal overall crimping. The lines should all be on the same straight line. The crimping degree shall be subject to the contact between the lower die and the lower die or the effective stroke specified by the crimping pliers. After pressing an indentation, it should stay for 10~15S. Then remove the pressure. The operation method of the press clamp should be carried out according to the procedures specified in the press clamp manual of the press clamp manufacturer.
2) After pressing, use a fine-tooth file to remove the water chestnut edge of the pressure pit and the end of the connecting pipe due to pressure, polish it with sandpaper, and then wipe it with a cotton cloth dipped in gasoline. Rinse the conductor connection joints of oil-impregnated paper insulated cables with cable oil heated to 120~130℃. To remove moisture and contamination, and then wrap the insulation at the joint.
3) For cables of 6kV and above, if local crimping is used, the surface of the connecting pipe should be covered with a layer of metallized paper or two layers of aluminum foil after crimping to eliminate the effect of power plant distortion caused by the pressure pit. The pit should be filled with bitumen insulating glue (or epoxy resin) first, and then the metal shielding should be wrapped. Terminals can be based on requirements, do not necessarily need to fill the pressure pits and wrap aluminum foil and so on.