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Power cable crimping process-crimping
2013-01-22
1) The position of each indentation shall be selected according to the position and regulations marked on the connecting pipe or terminal cylinder. The axial center line of the indentation pit for local crimping or the center line of the opposite side of the inscribed circle in the hexagonal integral crimping shall be on the same straight line. The degree of crimping shall be subject to the contact of the lower die or the effective stroke specified by the press clamp. After pressing an indentation, it should stay for 10~15S. The pressure was then removed. The operation method of the press clamp shall be carried out according to the procedures specified in the press clamp instructions of the press clamp manufacturer.
2) After pressing, use a fine-tooth file to file the water chestnut tilted due to pressure at the edge of the pit and the end of the connecting pipe, polish it with sandpaper, and then wipe it clean with cotton cloth dipped in gasoline. Flush the conductor connection joint of oil-impregnated paper insulated cable with cable oil heated to 120~130 ℃. To remove moisture and dirt, then insulation at the wrapped joint.
3) For 6kV and above cables, if local crimping is adopted, a layer of metallized paper or two layers of aluminum foil shall be wrapped on the surface of the connecting pipe after crimping to eliminate the distortion of the power plant caused by the pressure pit. For paper insulated cables, asphalt insulating glue (or epoxy resin) shall be used to fill the pressure pit first, and then the metal shield shall be wrapped around. Terminals can be according to the requirements, do not have to fill the solid pressure pit and aluminum foil, etc.
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