CN113629600B

CN113629600B - Cable repair adapter and cable repair method

Info

Publication number: CN113629600B
Application number: CN202110891978.1A
Authority: CN
Inventors: 罗定南; 王利; 潘传吉; 李剑波; 张伟; 周舟
Original assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Priority date: 2021-08-04
Filing date: 2021-08-04
Publication date: 2023-06-13
Anticipated expiration: 2041-08-04
Also published as: CN113629600A

Abstract

The invention relates to a cable repair adapter which is used for repairing a cable to be repaired by injecting repair liquid. The cable repairing device comprises a first sleeve, a second sleeve and a first sleeve, wherein the first sleeve is used for being coated on the outer side of a cable to be repaired and comprises at least two sealing shells which are distributed along the circumferential direction of the first sleeve, any adjacent sealing shells are in sealing connection, each sealing shell is used for being pressed on the cable to be repaired, and at least one sealing shell is provided with an injection hole; the first sleeve can form an injection cavity with the cable to be repaired, and the injection hole is communicated with the injection cavity so as to inject repair liquid into the injection cavity. When the cable to be repaired is repaired through the cable repair adapter, the situation that the bellows is difficult to sleeve caused by irregular shape and size of the second section of the connecting terminal is avoided. Meanwhile, the situation that repairing liquid leaks due to poor tightness between the inner wall of the bellows and the periphery of the cable to be repaired is avoided when the second section of the wiring terminal is larger in size, and then the selected sleeved bellows is larger in size.

Description

Cable repair adapter and cable repair method

Technical Field

The invention relates to the technical field of power system maintenance, in particular to a cable repair adapter and a cable repair method.

Background

During the production, transportation, operation and the like of the cable, local defects can be generated, the defects can enable moisture to enter the XLPE (cross-linked polyethylene) insulating layer, and the moisture can be gathered at microscopic defects under the action of an electric field, so that a water tree is initiated. And under the action of overvoltage, the tip of the water tree is easy to lead the power generation tree, and further the cable insulation is possibly broken down. The increasingly older cables would be costly and expensive to construct if directly replaced. Therefore, the power cable aging area is repaired by adopting the cable repair technology, so that the service life of the cable is prolonged, a large amount of manpower, material resources and financial resources are saved, the method has very important practical significance, and the method has a large application prospect.

However, in the prior art, the cable repairing device adopted in cable repairing is mostly complicated, and needs to be sleeved at the tail end of the power cable through sealing equipment of a bellows and other equipment and fastened through means such as a hose clamp, so that the applicability is poor. Meanwhile, the second sections of the connecting terminals at the tail ends of some cables are irregular in shape and size, and sometimes cannot be repaired by sleeving the bellows, so that the cable repairing device with good adaptability is very important.

Disclosure of Invention

Based on the above, it is necessary to provide a cable repair adapter for solving the technical problems of complicated structure and poor applicability of the current cable repair device.

A cable repair adapter, comprising:

the first sleeve is used for wrapping the outer side of the cable to be repaired, the first sleeve comprises at least two sealing shells which are distributed along the circumferential direction of the first sleeve, any adjacent sealing shells are connected in a sealing mode, each sealing shell is used for being pressed on the cable to be repaired, and at least one sealing shell is provided with an injection hole; the first sleeve can form an injection cavity with the cable to be repaired, and the injection hole is communicated with the injection cavity so as to inject repair liquid into the injection cavity.

In one embodiment, the cable repair adapter further comprises a second sleeve for wrapping around a first section of the cable to be repaired, the first sleeve being capable of being compressed against an outer side of the second sleeve, the injection cavity being located between an inner wall of the first sleeve, the cable to be repaired and an end of the second sleeve facing away from the second section of the cable to be repaired.

In one embodiment, the second sleeve comprises at least two sealing inner shells distributed along the circumferential direction of the second sleeve, and any adjacent sealing inner shells are in sealing connection, and each sealing inner shell is used for being pressed on the cable to be repaired.

In one embodiment, one of any two adjacent sealed inner shells is provided with a connecting lug, the other one is provided with a connecting groove, and the connecting lug is clamped in the connecting groove.

In one embodiment, the cable repair adapter further comprises a sealing sleeve compressed between the second sleeve and the first section of the cable to be repaired.

In one embodiment, the sealing sleeve comprises at least two sealing layers distributed along the circumferential direction of the sealing sleeve, and any adjacent sealing layers are in sealing connection.

In one embodiment, the sealing shell is provided with a connecting part outwards in the radial direction of the opening of the sealing shell, and the connecting part is provided with a connecting hole;

the cable repair adapter further comprises a connecting piece, wherein any adjacent corresponding connecting parts on the sealing shell penetrate through the corresponding connecting holes to be assembled.

In one embodiment, the number of the connecting holes is a plurality, the connecting holes are arranged at intervals along the axial direction of the first sleeve, and each connecting hole is correspondingly connected with the connecting piece.

In one embodiment, the cable repair adapter further comprises an air compressor connected to the injection port, the air compressor being configured to pressurize and inject the repair fluid into the injection cavity.

The invention also provides a cable repairing method which can solve at least one technical problem.

The cable repairing method provided by the invention comprises the following repairing steps:

cutting part of the insulating layer of the cable to be repaired and exposing the cable core and the inner semiconductive layer;

at least two seal shells distributed along the circumferential direction of the seal shell are pressed on the periphery of the insulating layer, and any adjacent seal shells are connected in a sealing way to form a first sleeve;

pressurizing the repairing liquid and injecting the repairing liquid into the injection cavity through the injection hole;

the repair liquid flows in through a gap between the inner semiconductive layer and the cable core and permeates between the inner semiconductive layer and the insulating layer through the inner semiconductive layer;

stopping the injection of the repairing liquid and closing the injection hole for standing.

In one embodiment, the cable repair method further comprises:

stripping heat shrinkage tubes and filling glue near the cable terminal to be repaired to expose the cable core, the inner semiconductive layer and the insulating layer;

at least two sealing inner shells distributed along the circumferential direction of the sealing inner shell are pressed on the first section, and the arbitrary adjacent sealing inner shells are connected with the connecting groove in a sealing way through the connecting convex blocks to form a second sleeve;

the first sleeve is pressed on the outer circumferences of the insulating layer and the second sleeve.

In one embodiment, the cable repair method further comprises:

at least two sealing layers distributed along the circumferential direction of the sealing sleeve are pressed on the first section, and any adjacent sealing layers are connected in a sealing way to form the sealing sleeve;

the second sleeve is tightly pressed on the sealing sleeve.

In one embodiment, after stopping the injection of the repair liquid and standing, cleaning the repair liquid near the injection hole and sequentially taking down the first sleeve, the second sleeve and the sealing sleeve;

cleaning the repair liquid in the injection cavity, and filling the glue and the heat shrinkage tube at the injection cavity.

The invention has the beneficial effects that:

according to the cable repair adapter provided by the invention, when the cable to be repaired needs to be filled with repair liquid for repair operation, at the moment, the cable to be repaired and the seal shell are in sealing connection by pressing the first sleeve formed by at least two seal shells distributed along the circumferential direction of the first sleeve on the cable to be repaired. And then the pressurized repair liquid is injected between the injection cavities through the injection holes, so that the repair liquid can be injected between the inner semiconductive layer and the cable core. After the repair liquid is injected between the inner semi-conductive layer and the cable core, the cable core is kept stand for a period of time, the repair liquid permeates between the inner semi-conductive layer and the insulating layer through the inner semi-conductive layer, and then moisture between the inner semi-conductive layer and the insulating layer is consumed by the repair liquid through hydrolysis condensation reaction and oligomer generation. Thus, the repair work of the cable to be repaired is completed. Because the structure of the first sleeve of the cable repair adapter consists of at least two sealing shells distributed along the circumferential direction of the first sleeve, when the first sleeve is required to be installed and connected with a cable to be repaired, the first sleeve does not need to be sleeved in along one end of a connecting terminal of the cable to be repaired, is directly clamped on the periphery of the cable to be repaired through the sealing shells and is in compression fit with the cable to be repaired, and then any two adjacent sealing shells are connected with each other. By the arrangement, the situation that the bellows is difficult to sleeve caused by irregular shape and size of the second section of the connecting terminal of the cable to be repaired is avoided. Meanwhile, the situation that repairing liquid leaks due to poor tightness between the inner wall of the bellows and the periphery of the cable to be repaired is avoided when the second section of the connecting terminal of the cable to be repaired is large in size and the bellows is large in size.

Drawings

FIG. 1 is a schematic view of a first sleeve of a cable repair adapter according to an embodiment of the present invention;

FIG. 2 is a schematic view of a second sleeve of the cable repair adapter shown in FIG. 1;

fig. 3 is a flow chart of a cable repair method performed by the cable repair adapter according to an embodiment of the present invention.

Reference numerals: 100-a first sleeve; 110-a first sealed housing; 111-a first connection; 112-first connection holes; 113-an injection hole; 120-a second sealed enclosure; 121-a second connection; 122-a second connection hole; 200-a second sleeve; 210-a first sealed inner housing; 211-connection bumps; 220-a second sealed inner housing; 221-connecting grooves; 230-a first sealing layer; 240-a second sealing layer; 300-cable core; 400-an inner semiconductive layer; 500-insulating layers; 600-connecting terminals; 610-first section; 620-second segment.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, fig. 1 is a schematic view of a first sleeve 100 of a cable repair adapter according to an embodiment of the present invention. The cable repair adapter provided by the embodiment of the invention is used for repairing the cable to be repaired by injecting repair liquid. The cable to be repaired sequentially comprises a cable core 300, an inner semiconductive layer 400 and an insulating layer 500 from inside to outside, wherein the tail end of the cable to be repaired is connected with a wiring terminal 600, the wiring terminal 600 comprises a first section 610 and a second section 620 fixedly connected to the first section 610, the first section 610 is used for being sleeved on the periphery of the cable core 300, and the second section 620 is provided with a wiring hole. The cable repair adapter comprises a first sleeve 100, wherein the first sleeve 100 is used for being coated on the outer side of a cable to be repaired, the first sleeve 100 comprises at least two sealing shells which are distributed along the circumferential direction of the first sleeve, any adjacent sealing shells are in sealing connection, each sealing shell is used for being pressed on the cable to be repaired, and at least one sealing shell is provided with an injection hole 113; the first sleeve 100 can form an injection cavity with the cable to be repaired, and the injection hole 113 is communicated with the injection cavity to inject repair liquid into the injection cavity.

When the cable repair adapter provided by the invention is used for repairing a cable to be repaired, at the moment, each sealing shell is pressed on the cable to be repaired, so that the first sleeve 100 formed by the plurality of sealing shells is pressed on the cable to be repaired, and finally, the cable to be repaired is in sealing connection with the sealing shells. And then the repair liquid is injected between the injection cavities through the injection holes 113, so that the repair liquid can be injected between the inner semiconductive layer 400 and the cable core 300. After the repair liquid is injected between the inner semiconductive layer 400 and the cable core 300, the repair liquid is left for a period of time, and the repair liquid permeates between the inner semiconductive layer 400 and the insulating layer 500 through the inner semiconductive layer 400, so that moisture between the inner semiconductive layer 400 and the insulating layer 500 is consumed by the repair liquid through hydrolytic condensation reaction and oligomer generation. Thus, the repair work of the cable to be repaired is completed.

Because the structure of the first sleeve 100 of the cable repair adapter is composed of at least two sealing shells distributed along the circumferential direction of the first sleeve, when the first sleeve is required to be installed and connected with a cable to be repaired, the first sleeve does not need to be sleeved in along one end of the connecting terminal 600, each sealing shell is directly clamped with the periphery of the cable to be repaired, and any two adjacent sealing shells are connected with each other, so that the installation of the cable to be repaired can be realized. In the installation, the first sleeve does not need to be in direct contact with the second section with irregular shape, so that the situation that when the cable to be repaired is in sealing connection in a mode of sleeving the bellows is avoided, the bellows is difficult to sleeve the second section. Meanwhile, the first sleeve does not need to be in direct contact with the second section, so that the influence of the size difference between the first sleeve and the second sleeve is avoided, and the problem that the tightness is influenced by the size difference is also avoided. Moreover, by utilizing the compaction of each sealing shell relative to the cable to be repaired and the sealing connection between any two adjacent sealing shells, the injection cavity is ensured to have good sealing performance, so that the problem of leakage of repair liquid due to lower sealing performance in the repair process is solved.

Referring to fig. 1, a sealing housing of a cable repair adapter according to an embodiment of the present invention is provided with a connecting portion protruding outward along a radial direction of an opening thereof, and the connecting portion is provided with a connecting hole. The cable repair adapter further comprises connecting pieces, corresponding connecting portions on any adjacent sealed shells are assembled through the corresponding connecting holes through the connecting pieces. In one embodiment, the connector may be a bolt. Specifically, the number of the connection holes is plural, the plural connection holes are arranged at intervals along the axial direction of the first sleeve 100, and each connection hole is correspondingly connected with a connection member. Through setting up a plurality of connecting holes of arranging along the axial interval of first sleeve 100 for the sealed shell is inseparabler each other, and then makes the first sleeve 100 also inseparabler with the insulating layer 500 of waiting to repair the cable between, and repair liquid is when getting into the injection intracavity and repairing the during operation, is difficult for revealing between first sleeve 100 and the insulating layer 500 and flows.

In one embodiment, the number of the connecting holes is three, however, the number of the connecting holes may be four, five or six, which is not limited thereto, so long as the plurality of connecting holes are arranged at intervals along the axial direction of the first sleeve 100 and can realize the function of sealing the sealed housings with each other.

Referring to fig. 1, in one embodiment, a first sleeve 100 is comprised of a first sealed housing 110 and a second sealed housing 120. The first sealing case 110 is provided with a first connection portion 111, and the first connection portion 111 is provided with three first connection holes 112 spaced apart in the axial direction of the first sleeve 100. The second sealing case 120 is provided with a second connection portion 121, and the second connection portion 121 is provided with three second connection holes 122 spaced apart along the axial direction of the first sleeve 100. The connecting piece is a bolt, and the bolt passes through the first connecting hole 112 and is in threaded connection with the hole wall of the second connecting hole 122, so that the first sealed housing 110 and the second sealed housing 120 are in sealed connection. Since the tight connection of the first and second

hermetic housings

110 and 120 is achieved by the bolts, the installation and the disassembly are very convenient and the sealability is strong. Effectively solves the problem of poor tightness caused by tightly connecting the bellows by using a hose clamp and the like.

The number of the seal shells forming the first sleeve 100 is not limited, and may be three, four, or five, as long as a plurality of seal shells can be distributed along the circumferential direction of the first sleeve 100, and the plurality of seal shells can be in sealing connection with each other and can be in sealing compression with the insulating layer 500 of the cable to be repaired.

Specifically, the cable to be repaired in the present invention is a crosslinked polyethylene (XLPE) cable, and since the crosslinked polyethylene cable may have some local defects during the production, transportation, operation, etc., moisture may enter the XLPE (crosslinked polyethylene) insulating layer 500 through various channels during long-term operation, and may gather at the microscopic defects under the action of an electric field, thereby causing a water tree, and under the action of an overvoltage, the tip of the water tree may easily cause a power generation tree, thereby possibly causing breakdown of the cable insulating layer 500. The increasingly older cables would be costly and expensive to construct if directly replaced. Therefore, the cable repair adapter is adopted to inject repair liquid into the aged area of the cable to repair the aged area of the cable, so that the service life of the cable is prolonged, and a large amount of manpower, material resources and financial resources are saved. Specifically, the repairing liquid is siloxane and catalyst, and is added with additives for inhibiting partial discharge, such as voltage stabilizer, antioxidant, etc. When the repair liquid enters between the inner semiconductive layer 400 and the insulating layer 500 of the cable to be repaired, under the action of the catalyst, the siloxane can consume the water entering between the insulating layer 500 and the inner semiconductive layer 400 through hydrolysis condensation reaction and generate an oligomer to fill the hollow space of the water tree, so that the purpose of prolonging the service life of the cable is achieved.

Referring to fig. 1 and 2, fig. 2 shows a schematic view of a second sleeve 200 of the cable repair adapter shown in fig. 1. The cable repair adapter according to an embodiment of the present invention further includes a second sleeve 200 for covering the first section 610, wherein an inner radius of the second sleeve 200 is equal to an outer diameter of the first section 610 of the connection terminal 600. The first sleeve 100 can be pressed against the outside of the second sleeve 200, with the injection cavity being located between the inner wall of the first sleeve 100, the cable to be repaired and the end of the second sleeve 200 facing away from the second section 620. When the repair liquid is injected into the injection cavity through the injection hole 113, the repair liquid can enter between the inner semiconductive layer 400 and the cable core 300, and at this time, the repair liquid is kept for a period of time, and the repair liquid permeates between the inner semiconductive layer 400 and the insulating layer 500 through the inner semiconductive layer 400, so that moisture between the inner semiconductive layer 400 and the insulating layer 500 is consumed by the repair liquid through hydrolysis condensation reaction and oligomer generation. By providing the second sleeve 200, the diameter compensation can be made for the end of the cable to be repaired, which is connected to the first sleeve 100. For example, when it is desired to repair a cable to be repaired from the side where the connection terminal 600 is provided, the diameter of the first section 610 of the connection terminal 600 is smaller than the diameter of the cable to be repaired. If the first sleeve 100 is directly fitted over the cable to be repaired and the outer circumference of the first section 610, a gap may exist between the first section 610 and the first sleeve 100 due to the smaller diameter of the first section 610. At this time, the repair fluid flows out from between the first section 610 and the first sleeve 100 when entering the injection cavity. By arranging the second sleeve 200, the second sleeve 200 is sleeved on the first section 610, and the first sleeve 100 is sleeved on the second sleeve 200. At this time, the repair liquid is hardly discharged from between the first section 610 and the first sleeve 100.

Specifically, the material of the inner semiconductive layer 400 is ethylene-vinyl acetate copolymer, and when the repair liquid enters between the inner semiconductive layer 400 and the cable core 300, there is a concentration difference between the inner semiconductive layer 400 and the cable core 300 and the repair liquid at both sides of the inner semiconductive layer 400 and the insulation layer 500, and the repair liquid permeates between the inner semiconductive layer 400 and the insulation layer 500 with low concentration from between the inner semiconductive layer 400 with high concentration and the cable core 300.

In one embodiment, the second sleeve 200 is an integral unit, and when the cable to be repaired needs to be repaired, the second sleeve 200 is directly sleeved into the periphery of the first section 610 from the second section 620 of the connection terminal 600.

In another of these embodiments, the second sleeve 200 is comprised of a plurality of sealed inner shells. Specifically, referring to fig. 2, in an embodiment of the present invention, the second sleeve 200 of the cable repair adapter includes at least two seal shells circumferentially distributed along the second sleeve, and any adjacent seal shells are in sealing connection with each other, and each seal shell is configured to be pressed against the first section 610 of the connection terminal 600. Specifically, one of any adjacent two seal inner casings is provided with a connection projection 211, the other is provided with a connection groove 221, and the connection projection 211 is caught in the connection groove 221.

In one embodiment, the second sleeve 200 is comprised of two sealed inner shells. Specifically, it is divided into a first sealed inner case 210 and a second sealed inner case 220. Four connection protrusions 211 are provided on the first inner sealing case 210, four connection grooves 221 are provided on the second inner sealing case 220, and the connection protrusions 211 are matched with the connection grooves 221, so that sealing connection between the first inner sealing case 210 and the second inner sealing case 220 is realized. Due to the four connection protrusions 211 and the four connection grooves 221, when the first and second

inner seal housings

210 and 220 fasten the first section 610 of the terminal 600, slippage is not easy to occur between the first and second

inner seal housings

210 and 220, and the connection is tighter.

The number of the seal housings forming the second sleeve 200 is not limited, and may be three, four or five, as long as a plurality of seal housings can be distributed along the circumferential direction of the second sleeve 200, and the plurality of seal housings can be in sealing connection with each other and can be in sealing compression with the first section 610 of the connection terminal 600.

Referring to fig. 2, the cable repair adapter according to an embodiment of the present invention further includes a sealing sleeve, which is compressed between the second sleeve 200 and the first section 610. By providing a sealing sleeve, the compression between the second sleeve 200 and the first section 610 is made tighter. When the cable to be repaired is repaired, the repair liquid is not easy to leak and flow out from between the second sleeve 200 and the first section 610, so that the air tightness of the cable is effectively ensured, and the defect of insufficient air tightness of the cable repair field installation is overcome. In addition, when the sealing sleeve is used, the sealing connection between the second sleeve 200 and the first section 610 can be improved by only adding the sealing sleeve, so that the sealing sleeve is very simple and convenient; and is also more aesthetically pleasing because the repair fluid is less prone to leaking between the second sleeve 200 and the first section 610.

In one embodiment, the sealing sleeve comprises at least two sealing layers distributed along the circumferential direction of the sealing sleeve, and any adjacent sealing layers are in sealing connection. Specifically, in one embodiment, the number of sealing layers is two. With continued reference to fig. 2, a sealing sleeve of a cable repair adapter according to an embodiment of the present invention is composed of a first sealing layer 230 and a second sealing layer 240. The two sealing layers are two semicircles with the same diameter, the two sealing layers are respectively pressed on the outer wall of the first section 610, the second sleeve 200 is installed at the moment, and an abutting force is applied to the outer wall of the sealing layers through the inner wall of the second sleeve 200, so that sealing connection between the sealing layers is realized. Of course, the number of the sealing layers forming the sealing sleeve is not limited, and may be three, four or five, as long as a plurality of sealing layers can be distributed along the circumferential direction of the sealing sleeve, and the plurality of sealing layers can realize a sealing connection function with each other.

In one embodiment, the sealing layer is made of rubber material, and the sealing layer made of rubber material is arranged between the second sleeve 200 and the first section 610, so that the friction force between the second sleeve 200 and the sealing layer and the friction force between the first section 610 and the sealing layer can be effectively increased, the second sleeve 200 is not easy to slide when being abutted to the outer wall of the sealing layer, and the sealing effect is better.

The first sleeve 100, the second sleeve 200 and the sealing sleeve of the cable repair adapter provided by the invention are in sealed connection with the cable to be repaired in a split up-and-down closing mode. Therefore, the electric cable repair device is small in size and convenient to carry, and can repair electric cables with different positions of cable terminal joints. Meanwhile, the installation and operation are simple, the disassembly is convenient, and the repair efficiency is greatly improved. Because the cable repair adapter realizes the sealing connection with the cable to be repaired in a split mode, the cable repair adapter does not need to be installed by adopting a bellows with larger size like the traditional repair adapter, and has stronger adaptability. Meanwhile, the tightness of the sleeve, the sealing sleeve and the cable to be repaired is better, the condition that repairing liquid is leaked and wasted is avoided, and the method has better economical efficiency.

The sealing range of the cable repair adapter provided by the invention is only between the cable insulation layer 500 and the first section 610 of the wiring terminal 600, so that the wiring function of the second section 620 of the wiring terminal 600 is not affected. Thus, it is possible to effectively avoid the need to replace or maintain the connection terminal 600 when performing the repair operation for the cable to be repaired because the repair liquid contaminates the second section 620 of the connection terminal 600.

In one embodiment, the cable repair adapter further comprises an air compressor connected to the injection port 113, the air compressor for pressurizing and injecting the repair liquid into the injection cavity. So that the repair liquid can more quickly enter between the inner semiconductive layer 400 and the insulation layer 500 of the cable to be repaired. Less time is required for repair operations.

Referring to fig. 3, fig. 3 is a schematic step flow diagram of a cable repair method performed by a cable repair adapter according to an embodiment of the present invention, and the cable repair method provided by the present invention can solve at least one of the above-mentioned technical problems.

The cable repair method provided by the invention is based on the cable repair adapter, and when the middle section of the cable to be repaired is repaired, in one example, the repair steps comprise: the live operation equipment is powered off, electrical parameters of the cable are measured after the power off, the aged cable is selected as a cable to be repaired, a portion of the insulating layer 500 of the cable to be repaired is cut, and the cable core 300 and the inner semiconductive layer 400 are exposed. At least two seal shells distributed along the circumferential direction of the seal shells are pressed on the periphery of the insulating layer 500, and the seal connection between any adjacent seal shells forms a first sleeve 100, the air tightness of the cable repair adapter and the cable to be repaired is checked, specifically, each seal shell is pressed on the cable to be repaired, the first sleeve 100 formed by a plurality of seal shells is pressed on the cable to be repaired, and finally, the cable to be repaired is in seal connection with the seal shells. Then pressurizing the repairing liquid and injecting the repairing liquid into the injection cavity through the injection hole 113; the repair liquid flows in through the gap between the inner semiconductive layer 400 and the cable core 300 and permeates between the inner semiconductive layer 400 and the insulation layer 500 through the inner semiconductive layer 400. After the repair liquid fills the whole cable to be repaired, stopping the injection of the repair liquid and closing the injection hole 113 for standing. Because the structure of the first sleeve 100 of the cable repair adapter is composed of at least two sealing shells distributed along the circumferential direction of the first sleeve, when the first sleeve is required to be installed and connected with a cable to be repaired, the first sleeve does not need to be sleeved in along one end of the connecting terminal 600, each sealing shell is directly clamped with the periphery of the cable to be repaired, and any two adjacent sealing shells are connected with each other, so that the installation of the cable to be repaired can be realized.

In another embodiment, when the cable to be repaired needs to be repaired from the connection terminal 600, the cable repair method further includes: the heat shrink tube and the filler paste near the cable termination to be repaired are stripped to expose the cable core 300, the inner semiconductive layer 400 and the insulation layer 500. At least two inner seal shells distributed along the circumferential direction of the inner seal shells are pressed against the first section 610, and any adjacent inner seal shells are in sealing connection with the connecting grooves 221 through the connecting protrusions 211 to form the second sleeve 200, and the first sleeve 100 is pressed against the outer circumferences of the insulating layer 500 and the second sleeve 200. Specifically, the first inner seal housing 210 and the second inner seal housing 220 are both used to press against the first section 610 of the terminal 600, and the first inner seal housing 210 and the second inner seal housing 220 are sealed and connected by the engagement between the connection protrusion 211 and the connection groove 221 to form the second sleeve 200. The first seal housing 110 and the second seal housing 120 are sleeved outside the second sleeve 200, and finally pass through the corresponding first connecting hole 112 and the corresponding second connecting hole 122 through the connecting piece, so that the first seal housing 110 and the second seal housing 120 form the first sleeve 100. Thus, the installation between the cable repair adapter and the cable to be repaired is completed.

The inner radius of the second sleeve 200 is equal to the outer diameter of the first section 610 of the terminal 600. The first sleeve 100 can be pressed against the outside of the second sleeve 200, with the injection cavity being located between the inner wall of the first sleeve 100, the cable to be repaired and the end of the second sleeve 200 facing away from the second section 620. By providing the second sleeve 200, the diameter compensation can be made for the end of the cable to be repaired, which is connected to the first sleeve 100. For example, when it is desired to repair a cable to be repaired from the side where the connection terminal 600 is provided, the diameter of the first section 610 of the connection terminal 600 is smaller than the diameter of the cable to be repaired. If the first sleeve 100 is directly fitted over the cable to be repaired and the outer circumference of the first section 610, a gap may exist between the first section 610 and the first sleeve 100 due to the smaller diameter of the first section 610. At this time, the repair fluid flows out from between the first section 610 and the first sleeve 100 when entering the injection cavity. By arranging the second sleeve 200, the second sleeve 200 is sleeved on the first section 610, and the first sleeve 100 is sleeved on the second sleeve 200. At this time, the repair liquid is hardly discharged from between the first section 610 and the first sleeve 100.

In still another embodiment, when the sealing between the second sleeve 200 and the first section 610 of the terminal 600 is better, the cable repair method further includes: at least two sealing layers distributed along the circumferential direction of the sealing sleeve are pressed on the first section 610, and any adjacent sealing layers are connected in a sealing way to form a sealing sleeve; and the second sleeve 200 is compressed against the sealing sleeve. Specifically, the sealing layers are pressed against the outer walls of the first sections 610, and then the second sleeve 200 is installed, and an abutment force is applied to the outer walls of the sealing layers through the inner walls of the second sleeve 200, so that sealing connection between the sealing layers is achieved. By providing a sealing sleeve, the compression between the second sleeve 200 and the first section 610 is made tighter. When the cable to be repaired is repaired, the repair liquid is not easy to leak and flow out from between the second sleeve 200 and the first section 610, so that the air tightness of the cable is effectively ensured, and the defect of insufficient air tightness of the cable repair field installation is overcome.

After stopping the injection of the repair liquid and standing, the cable repair method of the above embodiment further includes: cleaning the repair liquid near the injection hole 113 and sequentially removing the first sleeve 100, the second sleeve 200, and the sealing cartridge. Cleaning the repair liquid in the injection cavity, and filling the glue and the heat shrinkage tube at the injection cavity. Thereby completing the repair and cleaning work of the cable to be repaired.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A cable repair adapter for repairing a cable to be repaired, the cable to be repaired comprising a cable core (300), and a connecting terminal (600) connected to the end of the cable to be repaired, the connecting terminal comprising a first section (610) and a second section (620) fixedly connected to the first section (610), the first section (610) being used for being sleeved on the periphery of the cable core (300), the second section (620) being used for being provided with a connecting hole, characterized in that the cable repair adapter comprises a second sleeve (200) used for being coated on the first section (610) of the cable to be repaired, and a first sleeve (100) capable of being pressed on the outer side of the second sleeve (200) and being used for being coated on the outer side of the cable to be repaired;

the first sleeve (100) comprises at least two sealing shells distributed along the circumferential direction of the first sleeve, any adjacent sealing shells are in sealing connection, each sealing shell is used for being pressed on the cable to be repaired, and at least one sealing shell is provided with an injection hole (113); an injection cavity can be formed among the inner wall of the first sleeve (100), the cable to be repaired and the end part of the second sleeve (200) which is far away from the second section (620) of the cable to be repaired, and the injection hole (113) is communicated with the injection cavity so as to inject repair liquid into the injection cavity.

2. The cable repair adapter according to claim 1, characterized in that the second sleeve (200) comprises at least two sealing shells distributed circumferentially around itself, and that any adjacent sealing shells are sealingly connected to each other, each sealing shell being adapted to be pressed against the cable to be repaired.

3. Cable repair adapter according to claim 2, characterized in that one of any adjacent two of the inner sealing shells is provided with a connection projection (211) and the other one is provided with a connection recess (221), the connection projection (211) being snapped into the connection recess (221).

4. The cable repair adapter according to claim 1, further comprising a sealing sleeve compressed between the second sleeve (200) and the first section (610).

5. The cable repair adapter of claim 4 wherein the gland comprises at least two sealing layers circumferentially distributed about itself with a sealing connection between any adjacent sealing layers.

6. The cable repair adapter according to any one of claims 1 to 5, wherein the sealing housing is provided with a connecting portion protruding outward in a radial direction of an opening thereof, the connecting portion being provided with a connecting hole;

7. The cable repair adapter according to claim 6, wherein the number of the connection holes is plural, the plural connection holes are arranged at intervals in the axial direction of the first sleeve (100), and each of the connection holes is correspondingly connected with the connection member.

8. The cable repair adapter according to claim 1, further comprising an air compressor connected to the injection hole (113), the air compressor being for pressurizing and injecting repair liquid into the injection cavity.

9. The cable repair method is characterized in that the tail end of a cable to be repaired is connected with a binding post (600), the binding post comprises a first section (610), and the first section (610) is used for being sleeved on the periphery of a cable core (300), and the repair method comprises the following steps:

cutting a portion of the insulation layer of the cable to be repaired and exposing the cable core (300) and the inner semiconductive layer (400);

stripping heat shrinkage tubes and filling glue near the cable terminal to be repaired to expose the cable core (300), the inner semiconductive layer (400) and the insulating layer (500);

at least two seal inner shells distributed along the circumferential direction of the seal inner shells are pressed on the first section (610), and any adjacent seal inner shells are connected with the connecting grooves (221) in a sealing way through the connecting convex blocks (211) to form a second sleeve (200);

at least two seal shells distributed along the circumferential direction of the seal shell are pressed on the periphery of the insulating layer (500), the seal shells which are arbitrarily adjacent are connected in a sealing way to form a first sleeve (100), and the first sleeve (100) is pressed on the peripheries of the insulating layer (500) and the second sleeve (200);

pressurizing the repairing liquid and injecting the repairing liquid into the injection cavity through an injection hole (113);

the repair liquid flows in through a gap between the inner semiconductive layer (400) and the cable core (300) and permeates between the inner semiconductive layer (400) and the insulating layer (500) through the inner semiconductive layer (400);

stopping the injection of the repairing liquid and closing the injection hole (113) for standing.

10. The cable repair method of claim 9, further comprising:

at least two sealing layers distributed along the circumferential direction of the sealing device are pressed on the first section (610), and any adjacent sealing layers are connected in a sealing way to form a sealing sleeve;

the second sleeve (200) is pressed against the sealing sleeve.

11. The cable repair method according to claim 10, characterized in that after stopping the repair liquid injection and standing, cleaning the repair liquid near the injection hole (113) and sequentially removing the first sleeve (100), the second sleeve (200) and the sealing sleeve;