Cable long-acting repair liquid and use method thereof

Abstract

The invention discloses a cable long-acting repairing liquid and a using method thereof. The cable long-acting repairing liquid is composed of a rapid insulation reinforcing material, a medium-and-long-term reinforcing material, a catalyst and an anti-aging blender. The formula disclosed by the invention is configured in a short-term and medium-term mode, the problem that a governing formula may flow too fast under the action of injection pressure or the formula cannot be repaired thoroughly due to factors such as rapid outflow of the formula out of a cable body under the action of an environment is considered, and a copper-containing or aluminum-containing barrier is generated by combining a high-frequency voltage applying method with bias voltage, so that the aims of improving the insulating strength and preventing water invasion are achieved; the anti-aging blender provided by the invention not only reduces the temperature and increases the flash point temperature, but also has stable chemical properties of a stable treatment formula, and achieves the effects of long-term treatment and improvement of the long-term reliability of the cable.

Description

technical field [0001] The invention belongs to the field of cable repair, and in particular relates to a long-acting cable repair liquid and its application method. Background technique [0002] Cable is an indispensable power and information transmission medium in industrial applications, and is widely used in power industry, communication industry, automobile and aviation industry. After the cable is in operation, due to differences in the operating environment, manufacturing process, construction conditions, and maintenance technology level, various defects will occur, such as water aging, electric heating aging, holes, electrical radiation aging, and optical radiation aging. decrease, the loss increases. Therefore, how to repair the current cable defects and prolong the operating life of the cable has very important practical significance. [0003] Domestically, there have been relevant technical solutions for cable water tree aging treatment. For example, Chinese pat...

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Problems solved by technology

[0004] (1) Whether the flash point of the repair fluid poses a threat, and how to increase the flash point: the cable may generate a higher temperature under long-term overload conditions. If the cable still has discharge after repair, the flash point of the repair fluid may be too high. low cause fire;

[0005] (2) The short-term, medium-term and long-term composition problems of the repairing liquid when dealing with cable insulation defects: different components in the comprehensive formula of the repairing liquid have different penetration efficiencies in the cable, so it is possible that after injecting the repairing liquid for a certain period of time, some The repair fluid has been converted into a filler, and part of the repair fluid still remains in the cable body, but part of it will seep out of the main insulation of the cable over time;

[0006] (3) The stability and reliability of the remaining repair solution under the combined action of light and heat are not considered;

[0007] (4) Only the number of water branches is considered, and the situation of electric branches is not considered, that is, the suppression of internal discharge is not fully considered;

[0008] (5) The water content between the core and the insulating layer of the sheath layer under the discharged condition, and the interaction between the salt in the water tree and the discharge current are not considered;

[0009] (6) The process of pressurized injection of repair fluid is not considered, because the gaps of water branches inside the main insulation of the cable are not uniform, resulting in uneven pressure on the main insulation, and different main insulation extrusions are produced during the penetration of the repair fluid into the main insulation, resulting in main insulation. Insulation expansion, deformation, severe may directly lead to cable damage or other phases of multi-core (such as three-phase) cables are squeezed, thereby destroying the cable;

[0010] (7) When the repaired cable is injected with the repair fluid under pressure, the cable body may be in a state of soaking water or a relatively high humidity in the environment, resulting in a local area of ​​the cable where the environmental pressure is greater than that of the air, so the water-soaked position is not easy to pass through The pressure and discharge are detected. At this time, the repair fluid is soaked in water and the defective position will generate too much filler due to hydrolysis and chemical reaction (continuous water enters through the gap), resulting in uneven pressure inside and outside the cable, causing deformation. Repair fluid clogging and repair failure