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Repairing measures of cable fault in site
Mar 22, 2018

Cable many times when a fault is particularly troublesome, here to give you a description of how to take place in the cable site remedial measures. In the cable laying in the process of the cable sheath surface scratches broken phenomenon is widespread, the injury only slightly injured and sheath, how to repair to ensure quality, and repair time is short, but also to ensure that the quality of cable consumers are generally concerned about the problem.

 

   And the input is small, in the field of harsh conditions and easy to achieve, so the field of repair technology and the quality of the user is increasingly concerned about the problem. The site construction conditions of the cable are generally very bad, may be located in the initial construction of the power plant, may also be located in the initial construction of the field of new railways, may be on the bridge, but also in the cable tunnel, because the field cable sheath repair using plastic welding torch, and plastic torch heating requires 220V of alternating current, And in the field of newly-built projects, the site is generally lack of power, or a power supply may be due to the location of the site, the power supply to provide a certain degree of difficulty, so to achieve the repair of the cable sheath, on the one hand is the personnel in place, on the other hand, mainly the supply of power,


Only the above two basic preparation work can realize the normal development and carry out of the cable sheath repair work. In order to facilitate the smooth operation of the cable repair work, the construction unit should be equipped with small field generators. At the same time at the scene to repair the convenience of the current supply of plastic welding torch quality to be perfect. The nozzle heating area should be big, and the heating speed must be fast. and the cable line in the process of breakage site randomness, in general urban and plain areas, this work is relatively good to carry out, but in some mountainous areas, due to the impact of complex terrain, cable repair work is actually very difficult.


Therefore, in order to reduce the relevant input and solve the problem quickly, a key problem is that the cable laying process personnel must be adequate, and the use of regular cable professional laying equipment for normal line, to avoid and reduce the cable line in the process of the damage occurred in the sheath. The field of the cable repair needs of the technology is not very high, cable laying construction units, in the cable has been damaged, must be in the confirmation cable is not damaged under the premise, and then in the cable repair, otherwise the actual significance of cable sheath repair. Cable repair must be timely, otherwise the time of a long external moisture and moisture into, will affect the cable's production life. In the southern Meiyu weather cable end in the laying, the end of the cable due to the failure of timely sealing treatment, resulting in the flow of water into the cable trench into the cable broken 10-20 meters, peel the beginning of the insulation found that the conductor has been all black, resulting in the laying of the cable after the waste,


Therefore, for the laying of cables or to strengthen the corresponding aspects of the inspection, maintenance and custody, to prevent the cable in the electricity before the use of various external factors caused the cable life of shortening and termination. Some of the tools and materials used in the on-site repair of cables must be fully prepared, plastic welding torch is necessary, high pressure insulation tape, waterproof tape and plastic insulation and sheath peeling off the leather, and other sealing materials, must also be prepared, because the cable insulation sheath materials are mainly divided into cross-linked polyethylene, polyethylene, PVC and other materials. Some materials belong to thermosetting materials, such as XLPE insulation can not be repeated melting re-use, on-site use of raw materials to repair, can only use high-voltage insulation tape and the United States 3M Company to provide repair tape series repair. And some materials belong to thermoplastic materials, can be used again to melt the use of high-temperature, such as polyethylene, PVC and other materials, there can be based on the site, the use of cable end stripping off the corner of the sheath material cut into thin strips, you can achieve the Low-voltage cable insulation and sheath aspects of repair, The quality of the repair can fully meet the requirements of the normal performance of the cable. Another for the middle-voltage cable site in the process of laying the damage of the sheath, can not be too rough, one is the cable laying process must be handled, and then a cable appears outside the damage, the internal insulation of the damage is sometimes difficult to say, The author has been to the site laying process inadvertently caused by the external sheath of many damaged cables have been returned to the factory test, it is found that the damaged part of the cable has a partial discharge exceeding the standard and breakdown phenomenon, so for the medium voltage power cable in the on-site laying process of the external sheath damage, preferably truncated to do the middle connector or replace the cable,


Because the cable damaged parts of the sheath repair, there may be a potential use. It has been proved that the repair of low-voltage cable insulation and sheath must be less damage to the cable, only insulation and sheath damage, the rest of the cable structure intact under the premise of insulation and sheath repair, while the requirements of high-voltage cables may be more stringent, Now some of the works of cable transmission in order to reduce the number of middle connectors in the cable, cable all using large-length single core cable, due to the long line laying distance and the terrain is responsible for, and the number of construction personnel and the lack of professional cable laying equipment, and other factors, the construction process caused by the damage of cable sheath is greatly increased. Some construction in the above problems, the use of ordinary tape casually pack a bag, hasty, such a practice is very irresponsible. There is no understanding of the damage inside the cable breakage point, the cable in the on-site completion test process and the later operation process is likely to occur insulation breakdown or quality hazards.


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