CN103166164B - The assemble method of cable termination and the assembly for the formation of cable termination - Google Patents

Abstract

A method for assembling a cable terminal, comprising: annularly coating a first sealant on the outer wall of a support tube; annularly coating a second sealant on the first sealant; expanding the shrink sleeve and covering it on the support tube , the second sealant is covered by the edge of one end of the shrinkable sleeve, the adhesion between the second sealant and the shrinkable sleeve, and the adhesion between the first sealant and the second sealant are greater than Adhesion between the first sealant and the support tube; inserting the connected cables and terminal joints into the support tube, the connection part of the cable and the terminal joint is located in the support tube; and pulling out the support tube from the shrinkable sleeve, so that The shrink sleeve tightly covers the cable and the terminal joint, and the first sealant and the second sealant are clamped between the shrinkable sleeve and the terminal joint. An assembly for forming a cable termination is also provided. The components used to form the cable terminations can be prefabricated in the factory and the cable terminations installed on site, thereby simplifying the procedure for assembling the cable terminations.

Description

Method of assembling a cable terminal and components for forming a cable terminal

technical field

The present invention relates to an assembly method of a cable terminal for connecting cables to electrical equipment, in particular to an assembly method of a cable terminal with an insulation protection function and an assembly for forming the cable terminal.

Background technique

Cable accessories including cable terminals and intermediate joints are important parts in power transmission and transformation cable lines, where cable terminals are generally used at the connection between cables and electrical equipment such as generators, motors, transformers, and gas insulated switches (GIS), while Intermediate joints are generally used at the junction of two cables. The function of the cable terminal is to disperse the electric field at the cut-off point of the outer shield of the cable, protect the cable from being broken down, and prevent moisture and conductive media from intruding into the insulating sleeve under operating conditions and further contact with the conductor part of the cable, thereby preventing damage to the cable. The insulation performance of the joint part ensures the long-term effective and safe operation of the cable. In high-voltage transmission lines, most accidents are caused by cable accessories, so the quality of cables and accessories such as connectors is very important to the safety and reliability of the entire power transmission and transformation.

At present, various technologies have been developed to realize the protection of cable connections. For example, the Chinese patent application number CN85109479.1 discloses a heat-shrinkable sleeve combined with hot-melt adhesive, wherein the cable sealant is used in conjunction with the cold-shrinkable sleeve to increase the insulation performance of the cold-shrinkable sleeve.

In the cable terminal device 200 of the prior art, the sealant and the cold shrinkable sleeve are generally used in the following two ways:

1). The sealant and filler are first wound to the cable joint, and then the rubber body of the cold shrink tube is installed on the outside of the sealant, filler and cable insulation. The current sealant and filler are mainly EPDM sealant and Mainly filled with glue. This method is more complicated to install and requires higher operating requirements for installers;

2). The sealant and the cold-shrink tube are prefabricated in the factory. The sealant is filled in the middle of the rubber body of the cold-shrink tube and the support tube. It is only necessary to remove the support tube during installation. This method is easy to install and easy to operate. However, the requirements for the sealant are very high. First, the sealant is prefabricated between the rubber body (silicone rubber) of the cold-shrinkable tube and the support tube, and will receive the rubber body of the cold-shrinkable tube after expansion (generally expanded by about 3 times). High pressure, but according to the requirements of working conditions, during the storage period (2-3 years), the sealant cannot penetrate into the gap of the support tube, let alone dry out, age, etc., that is, the plasticity should be small, and weather resistance Good performance, but after being installed at the cable connection, the sealant is still required to have a certain degree of plasticity to fill the gap, isolate air, water vapor, etc.; secondly, when installing and removing the support tube, the sealant must be able to stick to the rubber body It is not brittle and does not pull out and move with the branches of the support tube, which requires that the adhesion between the sealant and the material of the support tube (multi-purpose polyolefins such as PE and PP, etc.) should be small, but the sealant and rubber There must be a certain degree of adhesion between the bodies (silicone rubber); finally, the plasticizers and fillers in the sealant cannot penetrate into the rubber body and the support tube material.

Contents of the invention

In order to solve the above and other technical problems in the prior art, the present invention proposes a cable terminal assembly method, which simplifies the procedure of assembling the cable terminal by selecting sealants with different properties.

According to a further aspect of the present invention, there is also provided a component for forming a cable terminal, which can be used to install the cable terminal on site with a simple assembly process, and the cable terminal has good sealing performance and anti-electric breakdown performance.

According to an embodiment of an aspect of the present invention, a method for assembling a cable terminal is provided, including the following steps: annularly coating a first sealant on the outer wall of a support tube; annularly coating a second sealant on the first sealant Two sealants: the shrinkable sleeve is expanded and placed on the support tube, and the second sealant is covered by the edge of one end of the shrinkable sleeve, wherein the second sealant and the shrinkable The adhesion force between the sleeves and the adhesion force between the first sealant and the second sealant are greater than the adhesion force between the first sealant and the support tube; the electrically connected inserting the cable and the terminal fitting into the support tube, wherein the connecting portion of the cable and the terminal fitting is located in the support tube; and withdrawing the support tube from the shrinkable sleeve so that the shrinkable sleeve A tube is tightly wrapped around the cable and terminal fitting, and the first and second sealants are sandwiched between the shrinkable sleeve and the terminal fitting.

In the above assembly method, the support tube is made of polyolefin material, the first sealant is silicone sealant, the shrinkable sleeve is made of silicone rubber or ethylene-propylene rubber, and the second The second sealant is made of polyolefin rubber.

In the above assembly method, the polyolefin rubber is at least one of EPDM rubber and butyl rubber.

In the above assembling method, the second sealant is coated in the approximate middle of the first sealant, and the width of the second sealant in the axial direction of the cable terminal is smaller than that of the first sealant. The width of the sealant in the axial direction of the cable terminal.

In the above assembly method, the width of the first sealant is generally 3-6 cm, and the width of the second sealant is 0.5-1 cm narrower than that of the first sealant.

In the above assembly method, the support tube is a helical support tube, and includes a pull wire extending from one end of the helical support tube to the other end, so that the helical support tube can be pulled out of the flexible support tube by pulling the pull wire. Shrink sleeve.

According to an embodiment of a further aspect of the present invention, there is provided an assembly for forming a cable termination, comprising: a helical tubular support tube including opposing first and second ends, and extending from said first end to a second a pull wire at the end; a first sealant, which is annularly bonded to the periphery of the support tube adjacent to the second end; a second sealant, which is annularly wrapped around the periphery of the first sealant; and a shrinkable sleeve , the first end of the support tube is inserted into the shrinkable sleeve, and the second sealant is covered by the edge of one end of the shrinkable sleeve; wherein, the second sealant and the shrinkable sleeve The adhesion force between the tubes and the adhesion force between the first sealant and the second sealant are greater than the adhesion between the first sealant and the support tube.

In the above assembly for forming a cable terminal, the support tube is made of polyolefin, the first sealant is silicone sealant, and the shrinkable sleeve is made of silicone rubber material or ethylene-propylene rubber material , the second sealant is made of polyolefin rubber.

In the above component for forming a cable terminal, the polyolefin rubber is at least one of EPDM rubber and butyl rubber.

In the above assembly for forming a cable terminal, the width of the second sealant in the axial direction of the cable terminal is smaller than the width of the first sealant in the axial direction of the cable terminal.

In the above assembly for forming a cable terminal, the width of the first sealant is generally 3-6 cm, and the width of the second sealant is 0.5-1 cm narrower than that of the first sealant.

According to the cable terminal assembly method and the assembly for forming the cable terminal according to the above-mentioned various embodiments of the present invention, the silicone sealant as the first sealant and the polyolefin rubber sealant as the second sealant are used in plasticity , plasticizers, thixotropy, and differences in adhesion to shrinkable sleeves made of silicone rubber material and support tubes made of polyolefin material, combined and applied to cable terminations of the seal. The components used to form the cable terminal can be prefabricated in the factory, and assembled with the cable and the terminal joint to form the cable terminal on site, thus simplifying the procedure of assembling the cable terminal, so that the cable terminal has good sealing and anti-electrical breakdown performance.

In order to make the purpose, features and advantages of the present invention more obvious and understandable, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

1 is a schematic cross-sectional view of a cable terminal made using an assembly for forming a cable terminal according to an exemplary embodiment of the present invention;

Fig. 2 is a partially enlarged schematic diagram of part A in Fig. 1;

Figure 3 is a schematic view of an embodiment of a support tube used during a method of assembling a cable termination according to the present invention;

Fig. 4 is the schematic diagram after coating two kinds of sealants on the support tube;

5 is a cross-sectional view of an assembly for forming a cable termination according to an exemplary embodiment of the present invention;

Figure 6 is an enlarged schematic view of part B in Figure 5;

Fig. 7 is a partial cross-sectional view after the insulating sleeve and two layers of sealant in Fig. 5 are installed on the cable and the terminal joint.

detailed description

While the present invention will be fully described with reference to the accompanying drawings containing preferred embodiments of the invention, it should be understood before proceeding that those skilled in the art may modify the invention described herein while obtaining the technical effects of the present invention. Therefore, it should be understood that the above description is a broad disclosure for those skilled in the art, and its content is not intended to limit the described exemplary embodiments of the present invention. The same reference numerals in the figures denote the same components.

Fig. 1 is a simple cross-sectional view of a cable terminal 100 according to an exemplary embodiment of the present invention, which is used to connect a cable 1 carrying a voltage such as 10 kV or more through a terminal joint 2 with, for example, a generator, a motor, a transformer , gas insulated switch (GIS) and other high-voltage electrical equipment connections (not shown). Referring to Figures 1 and 2, a cable terminal 100 made using an assembly for forming a cable terminal according to an exemplary embodiment of the present invention includes: a cable 1 having a conductive core portion 11; a terminal joint 2 for connecting to electrical equipment , by inserting the conductive core part 11 into the connection hole 21 of the terminal joint 2, the terminal joint 2 is electrically connected to the cable 1; for example, a shrinkable sleeve 3 with cold shrinkage, by using a support tube 4 (to be further described below) so that The shrinkable sleeve 3 is tightly covered on a part of the cable 1 and a part of the terminal joint 2, and the connecting part of the cable 1 and the terminal joint 2 is located in the shrinkable sleeve 3 to protect the connecting part; the first sealing Glue 5, bonded annularly on the periphery of the terminal joint 2; and a second sealant 6, annularly wrapped on the periphery of the first sealant 5, and covered by the edge of one end of the shrinkable sleeve 3, for example completely covered . An integral radially extending shed structure 31 is provided on the periphery of the shrinkable sleeve 3 .

As shown in FIG. 5, according to an embodiment of an aspect of the present invention, an assembly for forming a cable terminal 100 is provided, including: a spiral tubular support tube 4, including opposite first ends and second ends, and from The first end extends to the pull wire 41 at the second end; the first sealant 5 is annularly bonded to the periphery of the support tube 4 adjacent to the second end; the second sealant 6 is annularly coated on the first seal The periphery of the glue 5 ; and the shrinkable sleeve 3 , the first end of the support tube 4 is inserted into the shrinkable sleeve 3 , and the second sealant 6 is covered by the edge of one end of the shrinkable sleeve 4 . In the cable terminal 100 of the present invention, the adhesion force between the second sealant 6 and the shrinkable sleeve 3, and the adhesion force between the first sealant 5 and the second sealant 6 are greater than that of the first sealant. Adhesion between glue 5 and support tube 4.

Figure 3 shows an exemplary embodiment of a support tube 4, the support tube 4 is a helical support tube, and this helical support tube uses PE or PP as a strip-shaped support strip made of material and is wound into a helical tube and made, and include a stay wire 41 extending from a first end to a second end of the helical support tube, by pulling the stay wire 41 at the second end, the helical support tube can be sequentially released from the first end and become linear structure, and ultimately the complete disappearance of the helical support tube.

The assembling method of the cable terminal 100 according to an embodiment of the present invention will be described below with reference to FIGS. 4-7 and 1 . The assembly method includes the following steps: as shown in FIG. 4 , coating a layer of first sealant 5 with a certain width and thickness on the outer wall of the support tube 4 annularly; coating the first sealant 5 annularly on the first sealant 5 Second sealant 6 ; as shown in FIG. 5 , the support tube 4 is inserted into the shrinkable sleeve 3 , and, as shown in FIG. 6 , the second sealant 5 is completely covered by the edge of one end of the shrinkable sleeve 3 . Generally speaking, the diameter of the support tube 4 is larger than the diameter of the shrinkable sleeve 3 in the natural state, so that, due to the rigid support force of the support tube 4 and the elastic expandability of the shrinkable sleeve 3, the support tube 4 is inserted into the shrinkable In the state of the sleeve 3, the shrinkable sleeve 3 is in an elastic expansion state. That is to say, the shrinkable sleeve 3 is tightly wrapped on the support tube 4, and the first sealant 5 is attached to the periphery of the support tube 4, and the second sealant 6 is adhered near one end of the shrinkable sleeve 3 on the inner wall.

Afterwards, as shown in FIG. 7 , insert the electrically connected cable 1 and terminal joint 2 into the support tube 4, wherein the connecting portion of the cable 1 and the terminal joint 2 is located in the support tube, and the second sealant 6 can be adhered. One end of the shrink sleeve 3 is located at a predetermined position outside the terminal joint 2; after that, the support tube 4 is drawn out from the shrink sleeve 3 by pulling the pull wire 41 of the support tube 4, so that the spiral tubular support tube 4 gradually disappears and becomes linear structure. As the support tube 4 is pulled out from the shrinkable sleeve 3 , or as the helical support tube 4 gradually disappears, the shrinkable sleeve 3 gradually wraps tightly on the cable 1 and the terminal joint 2 due to elastic recovery.

Since the adhesion force between the second sealant 6 and the shrinkable sleeve 3 and the adhesion force between the first sealant 5 and the second sealant 6 are greater than those between the first sealant 5 and the support tube 4 In the process of pulling the support tube 4, the first sealant 5 will break away from the support tube 4, and finally the first sealant 5 and the second sealant 6 will be clamped between the shrinkable sleeve 3 and the terminal joint 2, thus forming the cable terminal 100 of the present invention as shown in FIG. 1 . The first sealant 5 and the second sealant 6 can prevent moisture and conductive media from intruding into the insulating shrinkable sleeve 3 under operating conditions and further contact with the conductive core part 11 of the cable, thereby preventing damage to the cable 1 when it is connected to the terminal. The insulation performance of the connection part between the joints 2 ensures that the cable 1 can run effectively and safely for a long time.

According to a further embodiment of the cable terminal 100 and its assembly method of the present invention, the support tube 3 is made of polyolefin material, the first sealant 5 is a silicone sealant, and the shrinkable sleeve 3 is made of silicone rubber material or ethylene propylene oxide. Made of rubber material, the second sealant 6 is made of polyolefin rubber. Further, the polyolefin rubber is at least one of EPDM rubber and butyl rubber. But the present invention is not limited thereto, and the above-mentioned various parts can also be made of other materials, as long as these materials can ensure the adhesion between the second sealant 6 and the shrinkable sleeve 3, and the first sealant 5 The adhesion force with the second sealant 6 is greater than the adhesion force between the first sealant 5 and the support pipe 4 .

According to a further embodiment of the present invention, the second sealant 6 is coated at approximately the middle position of the first sealant 5 , and the width of the second sealant 6 in the axial direction of the cable terminal 100 is smaller than that of the first sealant 5 The width in the axial direction of the cable terminal 100, in this way, it can be ensured that the second sealant 6 will not contact the support tube 4 during the assembly process of the cable terminal 100 of the present invention. In an exemplary embodiment, the width of the first sealant is 3-6 cm, and the width of the second sealant is 0.5-1 cm narrower than that of the first sealant.

According to the above-mentioned various embodiments of the cable terminal 100 and the assembly method thereof of the present invention, the silicone sealant as the first sealant 5 and the polyolefin rubber sealant as the second sealant 6 are used in terms of plasticity, plasticizer , the difference in thixotropy, and the difference in adhesion to the shrinkable sleeve 3 made of silicone rubber material and the support tube made of polyolefin material, the two are combined and applied to the sealing of the cable terminal 100 . The silicone sealant has little adhesion to the support tube 4 made of polyolefin material, while the polyolefin rubber sealant has strong adhesion to the cold-shrinkable shrinkable sleeve 3 . In this way, a silicone sealant with a certain width and thickness is coated on a specific position of the support tube 4, and then a layer of polyolefin sealant with a slightly smaller width is coated on the silicone sealant, and finally the shrinkable sleeve 3 Expand to the support tube 4 coated with two layers of sealant, after that, only need to pull out the support tube 4, the cold shrinkable shrinkable sleeve 3 and the two layers of sealant can be installed on the cable 1 and the terminal joint at the same time 2 connections.

Those skilled in the art can understand that the above-described embodiments are exemplary, and those skilled in the art can improve them, and the structures described in various embodiments do not conflict with each other in terms of structure or principle Under the circumstances, free combination can be carried out, so that on the basis of solving the technical problem of the present invention, more kinds of cable terminals 100 and their assembly methods can be realized.

After describing the preferred embodiments of the present invention in detail, those skilled in the art can clearly understand that various changes and changes can be made without departing from the scope and spirit of the appended claims, and the present invention is not limited by Implementation is limited to the exemplary embodiments set forth in the specification.

Claims (11)

1. an assemble method for cable termination, comprises the steps:

Coated first fluid sealant (5) circlewise on the outer wall of stay pipe (4);

Coated second fluid sealant (6) circlewise on described first fluid sealant;

Be set on described stay pipe after shrinkable sleeves (3) is expanded, and described second fluid sealant is by the edges cover of described shrinkable sleeves one end, the adhesion between wherein said second fluid sealant and described shrinkable sleeves and the adhesion between the first fluid sealant and the second fluid sealant are all greater than the adhesion between described first fluid sealant and described stay pipe;

The cable connected (1) and terminal fitting (2) are inserted described stay pipe, and the connecting portion of wherein said cable and described terminal fitting is in described stay pipe; And described stay pipe is extracted out from described shrinkable sleeves, to make described shrinkable sleeves closely be coated on described cable and terminal fitting, and described first fluid sealant and the second fluid sealant are sandwiched between described shrinkable sleeves and described terminal fitting.

2. assemble method as claimed in claim 1, wherein, described stay pipe is made up of polyolefin, and described first fluid sealant is organosilicon sealant, described shrinkable sleeves is made up of silastic material or ethylene-propylene rubber material, and described second fluid sealant is made up of polyolefin elastomer.

3. assemble method as claimed in claim 2, wherein, described polyolefin elastomer is at least one in ethylene propylene diene rubber and butyl rubber.

4. the assemble method as described in any one in claim 1-3, wherein, described second fluid sealant is coated on the roughly centre position of described first fluid sealant, and the width of described second fluid sealant on the axial direction of described cable termination is less than the width of described first fluid sealant on the axial direction of described cable termination.

5. assemble method as claimed in claim 4, wherein, the described width of described first fluid sealant is 3-6 centimetre, and the described width of described second fluid sealant is than the narrow 0.5-1cm of the first fluid sealant.

6. the assemble method as described in any one in claim 1-3, wherein, stay pipe is helical stay pipe, and comprise the bracing wire (41) extending to the other end from one end of described helical stay pipe, with by pulling described bracing wire to be pulled out from described shrinkable sleeves by described helical stay pipe.

7., for the formation of an assembly for cable termination, comprising:

The stay pipe (4) of helix, comprises relative first end and the second end and extends to the bracing wire (41) of the second end from described first end;

First fluid sealant (5), contiguous described second end is bonded in the periphery of described stay pipe circlewise;

Second fluid sealant (6), is coated on the periphery of described first fluid sealant circlewise; And

Shrinkable sleeves (3), the first end of described stay pipe inserts in described shrinkable sleeves, and described second fluid sealant is by the edges cover of one end of described shrinkable sleeves;

Wherein, the adhesion between described second fluid sealant and described shrinkable sleeves and the adhesion between the first fluid sealant and the second fluid sealant are all greater than the adhesion between described first fluid sealant and described stay pipe.

8. as claimed in claim 7 for the formation of the assembly of cable termination, wherein, described stay pipe is made up of polyolefin, and described first fluid sealant is organosilicon sealant, described shrinkable sleeves is made up of silastic material or ethylene-propylene rubber material, and described second fluid sealant is made up of polyolefin elastomer.

9. as claimed in claim 8 for the formation of the assembly of cable termination, wherein, described polyolefin elastomer is at least one in ethylene propylene diene rubber and butyl rubber.

10. the assembly for the formation of cable termination as described in any one in claim 7-9, wherein, the width of described second fluid sealant on the axial direction of described cable termination is less than the width of described first fluid sealant on the axial direction of described cable termination.

11. as claimed in claim 10 for the formation of the assemblies of cable termination, and wherein, the described width of described first fluid sealant is 3-6 centimetre, and the described width of described second fluid sealant is than the narrow 0.5-1cm of the first fluid sealant.