Repair method of flexible mineral insulated cable with metal outer sheath

Abstract

The invention discloses a method for repairing a flexible mineral insulated cable with a metal outer sheath. The method is characterized by comprising the following steps of: measuring and positioninga breakdown point by using a cable fault positioning instrument, respectively measuring linear distances from the breakdown point to two ends of a faulty cable, indicating that the faulty cable can be repaired if the linear distance from the breakdown point to one end of the faulty cable is within 100 meters, and defining the end as a first end; installing the faulty cable on the pay-off rack, pulling the first end head, pulling out the faulty cable, and pulling the faulty cable to a position where the breakdown point is exposed; cutting off the metal outer sheath, and pulling the metal outersheath forwards to expose the breakdown point; replacing the damaged or blackened insulating mica tape to restore the insulating property of the insulating mica tape, and winding the wrapping tape outside the insulating mica tape again; and welding the metal outer sheath together in a butt joint manner to obtain a qualified cable with repaired insulation performance. The method has the advantagesthat the method can be used for repairing the quality problem of the flexible mineral insulated cable, and scrap and inventory are effectively reduced.

Description

technical field [0001] The invention relates to a cable repair method, in particular to a repair method for a flexible mineral insulated cable with a metal outer sheath. Background technique [0002] Flexible mineral insulated cable is a kind of insulated cable with high conductivity copper as conductor, continuous wrapping of inorganic mineral insulating tape as insulation, and seamless welding of copper tape as sheath. The cable can work continuously at a high temperature of 250°C, has high fire characteristics (limit temperature 1083°C), is non-toxic when burned, and can maintain the integrity of the circuit when burned at a flame temperature of 950-1000°C for 3 hours. It has the characteristics of high temperature resistance, corrosion resistance, no aging, waterproof, explosion-proof, anti-magnetic interference, smoke-free and non-toxic, and can guarantee the safety of the public and buildings to the greatest extent. It is currently able to meet the increasingly stringe...

AI Technical Summary

Problems solved by technology

[0003] Due to the limitation of many factors such as production process, equipment and raw materials, flexible mineral insulated cables often have quality problems (usually failure of insulation performance). It may cause the entire line to be scrapped, or carry out inventory in sections, waiting for short-meter orders, resulting in great waste and occupying a certain amount of investment funds