Manufacturing process for middle wrapping welding type flexible joint of 66kV-500kV cable

Abstract

The invention discloses a manufacturing process of a middle wrapping fusion welding type flexible joint of a 66kV-500kV cable, and the manufacturing process comprises the following steps: a, welding a conductor; b, recovering an inner shielding layer, manually winding lining semi-conductive cloth at a conductor wire core, winding an inner shielding strip on the lining semi-conductive cloth, and heating the inner shielding strip to enable the inner shielding strip to be fused and formed; c, recovering the insulating layer, manually winding an insulating tape at the inner shielding layer, and heating the insulating tape to melt and form the insulating tape; d, recovering the outer shielding layer, manually winding an outer shielding strip on the insulating layer, and heating the outer shielding strip to melt and form the outer shielding strip; e, recovering the metal shielding layer, firstly winding the semi-conductive water-blocking tape outside the outer shielding layer, and installing a lead sleeve. According to the manufacturing process of the 66kV-500kV cable middle wrapping welding type flexible joint, the structure is simple, the cost is low, the quality is high, manufacturing is convenient, and the 66kV-500kV cable middle wrapping welding type flexible joint can be directly applied outdoors.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a manufacturing process of a 66kV-500kV cable intermediate wrapping welding type soft joint. Background technique [0002] The cable is the bridge between the power supply equipment and the electrical equipment, plays the role of transmitting electric power, and is widely used. Modern life and production are inseparable from electricity, therefore, cables are also inseparable. With the widespread use of cables, the number and quality of cable accessories required are also increasing. [0003] During the cable laying process, when the length of the cable is less than the laying length, it is necessary to connect two or more sections of cables so that the conductor cores of the cables are connected to form a continuous cable. The joints connected by cables must have certain insulation and sealing properties, comply with electrical insulation regulations, have a reasonable structur...

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Problems solved by technology

[0004] In the prior art, the restoration of the insulating layer of the cable is formed by mold injection molding. During production, it is necessary to extrude and wait for vulcanization time, resulting in a long production time, and the insulating layer is in the iron barrel device during the vulcanization process, and the micropores cannot be discharged; resulting in The use of the insulating layer at the joint is poor, so this recovery technology is only suitable for low-voltage cables below 66kV. If the high-voltage cable above 66kV is restored, due to problems such as micropores at the joint, the joint will not be able to carry high voltage.

[0005] In addition, the demand for cable connection is generally found in the process of laying cables outdoors. However, in the prior art, the restoration of the inner and outer shielding layers of the cable also requires the use of molds, resulting in the restoration of the cable joints, which requires extruders and vulcanization. The device and multiple sets of molds occupy a large area, and the equipment is inconvenient to carry. It is generally fixed indoors, so it is impossible to connect the cables at the construction site in time. In addition, the temperature and humidity in the air need to be strictly controlled during the recovery process of the insulation layer. As well as impurities in the air, multiple devices need to be operated at the same time to meet the standard requirements. However, there are many devices and they are not easy to carry. Some large devices cannot be placed in a small space. Therefore, a separate room is usually set up as a clean room. The equipment is installed in the clean room, and then the intermediate joints are made in the clean room, which also makes it impossible to connect the cables at the construction site in time

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