In the cable field laying process of the cable sheath surface scratching damage phenomenon is common, damage to the minor only hurt the sheath, how to repair the quality can be guaranteed, and repair time is short, but also to ensure the quality of the cable consumers are increasingly becoming a common concern. And the investment is small, in the field of poor conditions and easy to realize, so the scene of the sheath repair technology and quality is increasingly becoming a user concern.

　　Cable on-site construction conditions are generally worse, may be located in the initial construction of the power plant, may also be located in the initial construction of the field of new railroads, may be on the bridge, may also be in the cable tunnel, due to the field of cable sheath repair are used for plastic welding gun, and plastic welding gun heating needs 220V AC, and in the emerging construction of field projects, the scene is generally a lack of power supply, or power supply. Power supply may be due to the site of the cable laying position of the immediate nature of the power supply to provide a certain degree of difficulty, so to realize the cable sheath repair, on the one hand, the personnel in place, on the other hand, the main power supply, only to do a good job of the above two pieces of basic preparatory work, in order to achieve the normal development and carry out the work of repairing the cable sheath.

　　In order to facilitate the smooth progress of the cable repair work, the construction unit should be equipped with a small field generator. At the same time at the same time in the field to repair the convenience of the plastic welding torch now provided by the quality to be excellent. The nozzle heating area should be large, and the heating speed should be fast. And cable release process broken parts with randomness, in general the city and the plains, this work is better to carry out, but in some mountainous areas, due to the receipt of complex terrain, the cable repair work is actually very difficult. Therefore, to reduce the corresponding aspects of the investment and quickly solve the problem, a very critical issue is the cable laying process personnel must be equipped with a sufficient number of people, and the use of regular cable laying equipment for regular cable, avoiding and reducing the cable laying process of sheath breakage phenomenon.

　　Cable on-site repair of the technology required is not very high, cable laying construction unit, after the cable breakage, we must confirm that the cable is not damaged under the premise of the internal cable, and then in the cable repair, otherwise the cable sheath repair is of little practical significance. Cable repair must be timely, otherwise a long time outside the water and moisture into the cable will affect the service life of the production. In the southern rainy weather cable ends in the laying is completed, the end of the cable because there is no timely sealing process, resulting in the inflow of moisture into the cable trench into the cable severed 10-20 meters, peeling off the end of the insulation found that the conductor has been all black, resulting in the laying of the cable after the waste of the cable, so for the completion of the laying of cables should be strengthened in the corresponding aspects of the inspection, maintenance and storage, to prevent the cable from powering on Before using the site should be caused by various external factors to shorten the life of the cable and the end.

　　Cable repair site also used some of the tools and materials must be fully prepared, plastic torch is a must, high-voltage insulation tape, waterproof tape and plastic insulation and sheath peeled off the skin, such as sealing materials, must also be prepared, because the cable insulation and sheath materials are mainly divided into crosslinked polyethylene, polyethylene, polyvinyl chloride and other materials. Some materials belong to thermosetting materials, such as cross-linked polyethylene insulation can not be repeated melting and reuse, in the field with raw materials for repair, can only use high-voltage insulation tape and the United States 3M company to provide the repair tape series for repair. And some materials belong to thermoplastic materials, can be used again with high temperature to make it melt and use, China Wire and Cable Network (cable 315 network) www.xianlan315.com如聚乙烯, PVC and other materials, there can be taken on-site, the use of cable ends peeled off the edge of the sheath material cut into thin strips, can be realized on the low-voltage cable insulation and sheathing aspects of the repair, and the quality of repair! The quality of repair can fully meet the requirements of the normal use of cable performance. Another medium-voltage cable field laying process sheath damage phenomenon can not be too rough, a cable laying process must be taken lightly, and then a cable after the external damage, the destruction of its internal insulation is sometimes not good to say that the author has been on the scene during the laying process of construction accidentally caused by the outer sheath of the cable in many places of the damage has been returned to the factory for testing and found that the cable damage parts appear Partial discharge exceeds the standard and breakdown phenomenon, so for medium-voltage power cables in the field laying process after the outer sheath damage, it is best to cut off to do the intermediate joints or re-replace the cable, because the cable damaged parts of the sheath repair, there may be the use of hidden dangers.

　　Facts have proved that for low-voltage cable insulation and sheath repair must be cable damage is relatively minor, only the insulation and sheath