General repair method for cable damage

Abstract

The invention discloses a general repair method for cable damage. The method mainly comprises a step of removing an insulation damage section, namely forming an annular insulation repair notch to obtain a cable without the insulation damage section, a step of selecting an insulating layer repairing mold, wherein the diameter of a circular through hole of the mold is equal to that of an insulatinglayer, and the length is larger than that of an insulation damage section, a step of repair the insulating layer, namely placing a cable in the insulating layer repair mold, and enabling the center ofthe insulation damage section to coincide with a center of a middle section through hole of the mold, and a step of starting a mold temperature controller and an injection molding machine to carry out injection molding on the insulation repair notch to obtain a repaired cable. According to the method, various cable insulation damages can be repaired, a repairing material can reach a fine and island-type defect part, the repairing material and an existing insulating layer of the cable are fully melted, the combination is good, the thickness of a repairing layer is consistent and uniform, and the repairing quality is good.

Description

technical field [0001] The invention relates to a method for repairing cable damage. Background technique [0002] The cable consists of a conductor, an insulating layer, or a conductor, an insulating layer, and a sheath layer, and is the basic element for transmitting power. When cable damage leads to insulation failure, it will affect the safety and reliability of power transmission. When local damage to the cable causes local insulation failure, and the overall life of the cable is long, replacing the cable as a whole will lead to an unnecessary increase in power transmission costs. Therefore, it is usually used after repairing it. [0003] There are three main situations of local cable damage: one is "water tree" damage failure, the cable is served in a humid environment, and there are defects or impurities on the surface or interface of the conductor, and moisture gathers under the action of the electric field, making the insulation layer of the cable and The sheath ...

AI Technical Summary

Problems solved by technology

[0003] There are three main situations of local cable damage: one is "water tree" damage failure, the cable is served in a humid environment, and there are defects or impurities on the surface or interface of the conductor, and moisture gathers under the action of the electric field, making the insulation layer of the cable and "Tree-trunk" damage to the sheath layer, resulting in a significant drop in insulation resistance at the cable damage

The second is "electric tree" damage. The cable is served in a dry environment, and the insulation layer and the sheath layer are locally uneven or subject to external interference, resulting in high electromagnetic shock, and the material produces electrical corrosion, showing polarization, fatigue and Rapid aging due to thermal effects, forming trunk-type damage to the insulation layer and sheath layer, which in turn leads to partial insulation failure of the cable

The third is "mechanical damage". The cable is served in a dry environment, and its insulation layer is subjected to mechanical external force during use, resulting in local mechanical damage, resulting in partial insulation failure of the cable.

The structure of the device is complicated, and when the damaged part is obviously larger than the distribution interval (radian) of the liquid outlet, the one-time repair of the damaged part cannot be realized, and it needs to be re-aligned, and two or more repair operations are required. The operation is cumbersome, and the repair high cost

When the area of ​​the continuous loss part of the cable is large and deep, the lifting distance of the clamping claws is large, the repair filling space becomes smaller, the repair thickness of the cable is reduced, and the repair quality is poor

[0007] In summary, there are three reasons for insulation failure. The existing repair methods use different methods according to different types (causes) of cable insulation failure. It is impossible to use one method to uniformly repair the three insulation failure types; and each repair There are insurmountable flaws in both methods

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