CN111327013B - Cable terminal - Google Patents
Cable terminal Download PDFInfo
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- CN111327013B CN111327013B CN201811535997.5A CN201811535997A CN111327013B CN 111327013 B CN111327013 B CN 111327013B CN 201811535997 A CN201811535997 A CN 201811535997A CN 111327013 B CN111327013 B CN 111327013B
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- cable
- insulating sleeve
- stress cone
- screen
- insulating
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/04—Cable-end sealings
- H02G15/043—Cable-end sealings with end caps, e.g. sleeve closed at one end
- H02G15/046—Cable-end sealings with end caps, e.g. sleeve closed at one end with bores or protruding portions allowing passage of cable conductors
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Abstract
A cable terminal comprises a capacitive insulating sleeve, wherein the insulating sleeve is provided with a cavity for accommodating a cable, a stress cone is arranged between the insulating sleeve and the cable, the stress cone is positioned at the other end far away from a wire inlet end of the cable terminal, the insulating sleeve comprises a plurality of capacitive screens which are alternately arranged with insulating layers, the innermost capacitive screen is a grounding screen, the outermost capacitive screen is a high-voltage screen, and the high-voltage screen is electrically connected with a cable guide core of the cable, so that when the cable terminal is connected with the cable, the part of the cable which needs to be stripped to a main insulating layer outside the cable guide core is reduced, and when the cable is not installed in place or needs to be adjusted, the length which needs to be intercepted and wasted is greatly reduced; furthermore, a filling-free gap can be present between the insulating sleeve and the cable.
Description
Technical Field
The invention relates to the field of high-voltage electric appliances, in particular to a cable terminal for a high-voltage cable.
Background
The existing cable terminal generally comprises a stress cone, an insulating sleeve and an insulating medium filled in an inner space, wherein the stress cone (also called the stress sleeve) is used for improving the electric field intensity at the root of the cable; the insulating sleeve is used for containing the stress cone and an insulating medium, supporting the cable terminal and increasing the external creepage distance, an upper flange at the end part of the insulating sleeve is fixed with the end part of the cable conductor, and a lower flange at the root part of the insulating sleeve is fixed and connected to the grounding part of the cable sheath; the insulating medium is used for filling air gaps in the electric field and preventing discharge.
Generally, a cable terminal should be constructed such that a semi-conductive layer of a cable portion entering the cable terminal is scraped off to satisfy insulation requirements of high voltage to the ground. The stress cone should be fitted in this location with its conductive part in contact with the semiconductive layer and its insulating part in contact with the cable insulation.
In recent years, a dry capacitive cable termination technology (such as patent CN2582240Y) has been developed, and has been greatly advanced. Because the capacitive screen is embedded in the insulating sleeve, the internal electric field is improved, and the insulating level is improved. Particularly, the innermost capacitive screen of patent CN105743053A and the cable conductor form a high-voltage equipotential cabin, and no medium needs to be filled between the cable and the insulating sleeve, thereby thoroughly solving the problem of medium leakage.
However, as with a conventional cable termination, the semiconductive layer at the end of the cable also needs to be scraped off and polished smooth, which is a long distance and difficult to work on site (often on a tower). Moreover, if the cable terminal is damaged and needs to be replaced, the longer cable section must be sawn off, and the same length of cable section is scraped off, so that not only is the construction difficulty increased, but also the reserved cable cannot be constructed due to insufficient length, and even a new cable needs to be replaced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cable terminal which is convenient to construct, install and replace.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a cable termination, includes capacitive type's insulating sleeve 7, insulating sleeve 7 is equipped with the cavity that is used for holding cable 10, is equipped with stress cone 4 between insulating sleeve 7 and cable 10, stress cone 4 is located the other end of keeping away from the inlet wire end of cable termination, insulating sleeve 7 includes a plurality of capacitive screens that set up with the insulating layer in turn, and wherein the capacitive screen of the innermost is ground screen 6, and the capacitive screen in the outside is high-voltage screen 5, high-voltage screen 5 leads the core electricity with cable 10's cable and is connected.
Preferably, there is a filling-free gap between the insulating sleeve 7 and the cable 10.
Preferably, the two ends of the insulating sleeve 7 are respectively provided with the mounting flange 9 and the upper flange 2, the cable 10 penetrates into the insulating sleeve 7 from one end of the mounting flange 9, the stress cone 4 is positioned at one end, close to the upper flange 2, of the cable terminal, and the insulating sleeve 7 is externally sleeved with the outer sheath 8.
Preferably, the plurality of capacitive screens in the insulating sleeve 7 are gradually shortened from inside to outside layer by layer, and gradually offset towards one end of the wire inlet end far away from the cable terminal.
Preferably, the stress cone 4 comprises an insulating part 43 and a conducting part 41, one end of the insulating part 43 is a tapered end 42 matched with the insulating sleeve 7, the outer side surface of the tapered end 42 is tightly in press fit with the inner side surface of a tapered groove at one end of the insulating sleeve 7, the conducting part 41 is located at the inner side of the end part of the tapered end 42, and the conducting part 41 is electrically connected with the grounding screen 6.
Preferably, the conductive portion 41 includes a conductive lobe 44 extending from the inside out and in a direction away from the wire end of the cable termination.
Preferably, the cable terminal is further provided with an elastic pressing mechanism 3 for tightly contacting the stress cone 4 and the insulating sleeve 7.
Preferably, the upper flange 2 comprises a sealing cover 21 connected with the insulating sleeve 7 and an end sleeve 22 connected with a cable guide core of the cable 10, the end sleeve 22 is sleeved on the cable guide core of the cable 10, and the other end extends out of the sealing cover 21 to be connected with the connecting terminal 1.
Preferably, the end sleeve 22 is fixedly connected with the insulating sleeve 7 through a bracket 23 and a bracket screw. The high-voltage screen 5 of the insulating sleeve 7 is electrically connected with the end sleeve 22 through a bracket screw and a bracket 23.
Preferably, the cable terminal is also provided with an elastic pressing mechanism 3 which enables the stress cone 4 and the insulating sleeve 7 to be in close contact; the elastic pressing mechanism 3 is arranged between the upper flange 2 and the insulating sleeve 7 and comprises a spring 31 and a stress cone pressing part 32 matched with the stress cone 4, one end of the spring 31 is propped against the bracket 23, and the other end of the spring pushes the stress cone 4 and the insulating sleeve 7 through the stress cone pressing part 32; the grounding screen 6 is electrically connected with the mounting flange 9.
The cable terminal has two characteristics, namely, the stress cone is not arranged at the wire inlet end of the cable entering the cable terminal, but is arranged at the other end (high-voltage end) far away from the wire inlet end; secondly, a capacitive screen in the capacitive insulation sleeve is not a traditional high-voltage screen but an external grounding screen, but the internal grounding screen and the external high-voltage screen are arranged; when the cable terminal is installed and connected with a cable, the length of the semi-conducting layer to be scraped off by the cable is reduced, so that the difficulty of site construction is reduced, the construction speed is improved, and the length of the cable to be intercepted and wasted when the cable is not installed in place or the cable terminal needs to be replaced is greatly reduced.
In addition, the cable terminal provided by the invention has the advantages that the gap between the insulating sleeve and the cable is not required to be filled when the cable is installed, the installation efficiency is greatly improved, and the cost is reduced.
Drawings
Fig. 1 is a schematic structural view of the inventive cable termination.
Detailed Description
The following description will further describe an embodiment of the inventive cable termination in conjunction with the embodiment shown in fig. 1. The inventive cable termination is not limited to the description of the embodiments below.
The cable terminal comprises a capacitive insulating sleeve 7, wherein the insulating sleeve 7 is provided with a cavity for accommodating a cable 10, a stress cone 4 is arranged between the insulating sleeve 7 and the cable 10, the stress cone 4 is positioned at the other end far away from a wire inlet end of the cable terminal, the insulating sleeve 7 comprises a plurality of capacitive screens which are alternately arranged with insulating layers, the innermost capacitive screen is a grounding screen 6, the outermost capacitive screen is a high-voltage screen 5, and the high-voltage screen 5 is electrically connected with a cable guide core of the cable 10.
The cable terminal has two characteristics, namely, the stress cone is not arranged at the wire inlet end where the cable enters, but arranged at the other end far away from the wire inlet end; secondly, a capacitive screen in the capacitive insulation sleeve is not a traditional high-voltage screen but an external grounding screen, but the internal grounding screen and the external high-voltage screen are arranged; when the cable terminal is installed and connected with a cable, the length of the semi-conducting layer to be scraped off by the cable is reduced, so that the difficulty of site construction is reduced, the construction speed is improved, and the length of the cable to be intercepted and wasted when the cable is not installed in place or the cable terminal needs to be replaced is greatly reduced. The traditional cable terminal is provided with a high-voltage screen, a grounding screen and a stress cone arranged at a wire inlet end, namely a low-voltage end.
Furthermore, a filling-free gap is present between the insulating sleeve 7 and the cable 10. Because the inner side of the insulating sleeve is the ground potential, gaps between the insulating sleeve and the cable do not need to be filled when the cable is installed, the installation efficiency is greatly improved, the cost is reduced, liquid or gas medium leakage is prevented, and the safety and reliability are greatly improved. Of course, it is also possible if the installation is not to be filled with an insulating medium (such as transformer oil, SF6 gas), and the like, and still fall within the protection scope of the present invention.
As shown in fig. 1, the cable termination of the present embodiment includes an insulating sleeve 7 of a capacitive type, the insulating sleeve 7 is provided with a cavity for accommodating a cable 10, a mounting flange 9 and an upper flange 2 are respectively provided at both ends of the insulating sleeve 7, a stress cone 4 is provided between the insulating sleeve 7 and the cable 10, and an outer sheath 8 is provided around the insulating sleeve 7. One end of the mounting flange 9 is a wire inlet end of a cable terminal, a cable 10 penetrates into the insulating sleeve 7 from one end of the mounting flange 9, and the stress cone 4 is located at the other end of the wire inlet end far away from the cable terminal, namely located at one end, close to the upper flange 2, of the cable terminal and located at one end far away from the mounting flange 9.
The core body of the insulating sleeve 7 is internally provided with a plurality of capacitive screens which are alternately arranged with the insulating layers, wherein the capacitive screen at the innermost side is a grounding screen 6, the capacitive screen at the outermost side is a high-voltage screen 5, the high-voltage screen 5 is electrically connected with the cable guide core of the cable 10, and the grounding screen 6 is used for grounding. Preferably, the ground screen 6 is grounded via a mounting flange 9. Further, a plurality of electric capacity screens in insulating sleeve 7 shorten by interior to outer successive layer, and shift to the one end of keeping away from the inlet wire end at cable termination gradually, promptly to the skew of the one side notch cuttype that is equipped with stress cone 4, can more effectual change electric field distribution.
The stress cone 4 is sleeved on the cable 10, the inner side of the stress cone is tightly pressed with the cable 10, the outer side of the stress cone is tightly pressed with the insulating sleeve 7, the electric field intensity at the root of the cable is improved, and stress concentration is reduced. Stress cone 4 includes insulating part 43 and conducting part 41, conducting part 41 be used for with the semi-conductive layer crimping cooperation of cable 10, and conducting part 41 is connected with ground screen 6 electricity, insulating part 43 be used for with the main insulating layer crimping cooperation of cable 10, insulating part 43 one end be with insulating sleeve 7 complex tapered end 42, the lateral surface of tapered end 42 and the tight crimping cooperation of tapered groove medial surface of insulating sleeve 7 one end, conducting part 41 is located the tip of tapered end 42 is inboard, is located the one end that stress cone 4 is close to the tapered groove of insulating sleeve 7, conducting part 41 includes conducting lobe 44 from inside to outside extension, and conducting lobe 44 extends to the incoming line terminal direction of keeping away from the cable terminal. Both the insulating part 43 and the conductive part 41 of the stress cone 4 can be made of an elastic material. Of course, as another embodiment of the stress cone, the stress cone 4 may not be provided with the conductive portion 41, as long as the outer side surface of the cone-shaped end 42 of the stress cone 4 is tightly press-fitted with the inner side surface of the cone-shaped groove at one end of the insulating sleeve 7, and the inner side of the stress cone 4 is tightly press-fitted with the main insulating layer of the cable 10, the voltage-sharing effect of the capacitor cone can also be achieved, but the construction difficulty and the voltage-sharing effect are poor.
Further, the cable terminal is also provided with an elastic pressing mechanism 3 which enables the stress cone 4 and the insulating sleeve 7 to be in close contact. As shown in fig. 1 in detail, the elastic pressing mechanism 3 is disposed between the upper flange 2 and the insulating sleeve 7, and includes a spring 31 and a stress cone pressing portion 32 engaged with the stress cone 4. Preferably, one end of the stress cone 4, which is matched with the stress cone pressing part 32, is in a cone shape, so that the stress cone 4 is tightly matched with the stress cone pressing part 32 through an inclined plane; of course, it may not be a conical shape, but may be a circular plane.
The upper flange 2 seals one end of the insulating sleeve 7 and comprises a sealing cap 21 connected to the insulating sleeve 7 and an end cap 22 connected to the cable conductor of the cable 10. The sealing cap 21 is connected to the insulating sleeve 7 by screws, and an elastic sealing sleeve may also be provided between the sealing cap 21 and the insulating sleeve 7. The end sleeve 22 is sleeved on the cable guide core of the cable 10, and the other end of the end sleeve extends out of the sealing cover 21 to be connected with the wiring terminal 1.
Furthermore, the end sleeve 22 is fixedly connected with the insulating sleeve 7 through a bracket 23 and a bracket screw. The high-voltage screen 5 of the insulating sleeve 7 is electrically connected with the end sleeve 22 through a bracket screw and a bracket 23, and is electrically connected with the cable guide core of the cable 10 through the end sleeve 22. One end of a spring 31 of the elastic pressing mechanism 3 is supported on the bracket 23, and the other end pushes the stress cone 4 to be in close contact with the insulating sleeve 7 through a stress cone pressing part 32.
The mounting flange 9 is used for mounting and fixing the cable terminal, and is usually mounted on a telegraph pole or an electric power tower, but can also be mounted on the ground or other places. Preferably, the grounding screen 6 is electrically connected with the mounting flange 9 and is grounded through the mounting flange 9.
The outer sheath 8 is a shed of silicone rubber, although other types or materials of outer sheaths can be used for the cable termination.
The cable terminal is used for connecting the starting end or the tail end of a high-voltage cable. A high-voltage cable generally comprises, from inside to outside, a cable guide core, a main insulating layer, and a semi-conducting layer (main insulating outer shielding layer); and other protection structures such as an armor layer, a sheath layer and the like are arranged outside the semi-conductive layer. When the cable terminal and the cable are installed in a construction site, an armor layer or a sheath layer and the like of the cable extending into the terminal part of the cable are stripped, and a semi-conducting layer is exposed; then scraping off the semi-conducting layer of the part corresponding to the part from the insulating part 43 of the stress cone 4 to the end sleeve 22 to expose the main insulating layer part; the main insulation layer of the portion corresponding to the end sleeve 22 is stripped to expose the cable core. The cable is inserted into an insulating sleeve 7 of a cable terminal, a stress cone 4 is sleeved on the cable, a conductive part 41 of the stress cone 4 corresponds to and is pressed against a semi-conductive layer of the cable, an insulating part 43 of the stress cone 4 corresponds to and is pressed against a main insulating layer of the cable, an elastic pressing mechanism 3 is installed, a support 23 and an end sleeve 22 are pressed tightly, the sealing cover 21 is used for sealing and pressing, and then a connecting terminal 1 is connected.
According to the insulating sleeve 7 of the cable terminal, the high-voltage screen 5 is arranged on the outer side, and the grounding screen 6 is arranged on the inner side, so that insulating media do not need to be filled between a cable and the insulating sleeve 7 of the cable terminal, vacuumizing is not needed, and the cable terminal is simple in structure, low in cost and convenient to assemble and maintain. And set up stress cone 4 in last flange one end, be located the one end of the tip that is close to the cable for the part that needs to scrape off the semi-conducting layer significantly reduces, has reduced the construction degree of difficulty and time. When the installation of the cable terminal needs to be adjusted and replaced, the cable part needing to be cut off is greatly reduced, and the problem that the length reservation of the cable is not enough is avoided.
The foregoing is a more detailed description of the invention, taken in conjunction with the accompanying preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the inventive concept, and all should be considered as falling within the protection scope of the invention.
Claims (10)
1. Cable termination comprising an insulating sleeve (7) of the capacitive type, said insulating sleeve (7) being provided with a cavity for housing a cable (10), a stress cone (4) being provided between the insulating sleeve (7) and the cable (10), characterized in that: stress cone (4) are located the other end of keeping away from the inlet wire end at cable terminal, insulating sleeve (7) include a plurality of and insulating layer alternating arrangement's electric capacity screen, and wherein the electric capacity screen of the most inboard is ground screen (6), and the electric capacity screen of the outside is high-voltage screen (5), high-voltage screen (5) are led the core electricity with the cable of cable (10) and are connected.
2. The cable termination of claim 1, wherein: a filling-free gap is present between the insulating sleeve (7) and the cable (10).
3. The cable termination of claim 1, wherein: be equipped with mounting flange (9) and upper flange (2) respectively at the both ends of insulating sleeve (7), in cable (10) penetrated insulating sleeve (7) from mounting flange (9) one end, stress cone (4) are located the cable termination and are close to the one end at upper flange (2) place, are equipped with oversheath (8) at insulating sleeve (7) overcoat.
4. The cable termination of claim 1, wherein: and the plurality of capacitive screens in the insulating sleeve (7) are shortened layer by layer from inside to outside and gradually deviate towards one end of the wire inlet end far away from the cable terminal.
5. The cable termination of claim 1, wherein: stress cone (4) include insulating part (43) and conducting part (41), the one end of insulating part (43) for with insulating sleeve (7) complex tapered end (42), the lateral surface of tapered end (42) closely the crimping cooperation with the tapered groove medial surface of insulating sleeve (7) one end, conducting part (41) are located the tip of tapered end (42) is inboard, and conducting part (41) are connected with ground screen (6) electricity.
6. The cable termination of claim 5, wherein: the conductive portion (41) includes a conductive lobe (44) extending from the inside to the outside in a direction away from a wire end of the cable terminal.
7. The cable termination of claim 1, wherein: the cable terminal is also provided with an elastic pressing mechanism (3) which enables the stress cone (4) and the insulating sleeve (7) to be in close contact.
8. The cable termination of claim 3, wherein: go up flange (2) including sealed cowling (21) be connected with insulating sleeve (7) and with the pot head (22) that the cable of cable (10) led the core and be connected, pot head (22) cover is on the cable of cable (10) leads the core, and the other end extends to sealed cowling (21) outside and is connected with binding post (1).
9. The cable termination of claim 8, wherein: the end sleeve (22) is fixedly connected with the insulating sleeve (7) through a support (23) and a support screw, and the high-voltage screen (5) of the insulating sleeve (7) is electrically connected with the end sleeve (22) through the support screw and the support (23).
10. The cable termination of claim 9, wherein: the cable terminal is also provided with an elastic pressing mechanism (3) which enables the stress cone (4) and the insulating sleeve (7) to be in close contact; the elastic pressing mechanism (3) is arranged between the upper flange (2) and the insulating sleeve (7) and comprises a spring (31) and a stress cone pressing part (32) matched with the stress cone (4), one end of the spring (31) is propped against the support (23), and the other end of the spring pushes the stress cone (4) and the insulating sleeve (7) through the stress cone pressing part (32); and the grounding screen (6) is electrically connected with the mounting flange (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811535997.5A CN111327013B (en) | 2018-12-14 | 2018-12-14 | Cable terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811535997.5A CN111327013B (en) | 2018-12-14 | 2018-12-14 | Cable terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111327013A CN111327013A (en) | 2020-06-23 |
| CN111327013B true CN111327013B (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811535997.5A Active CN111327013B (en) | 2018-12-14 | 2018-12-14 | Cable terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111327013B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3439110A (en) * | 1968-06-04 | 1969-04-15 | G & W Electric Speciality Co | Prefabricated stress control shield |
| EP0732791A1 (en) * | 1995-03-13 | 1996-09-18 | ABBPATENT GmbH | Device for exerting a pressure on a resilient stress control cone |
| JP2003189454A (en) * | 2001-12-19 | 2003-07-04 | Mitsubishi Cable Ind Ltd | Capacitor cone |
| CN1710766A (en) * | 2004-06-16 | 2005-12-21 | 王日新 | Prefabricated dry-type capacity type cable terminal |
| CN2912054Y (en) * | 2006-04-24 | 2007-06-13 | 王钰 | Prefabricating high voltage cable terminal |
| CN105743053A (en) * | 2014-12-08 | 2016-07-06 | 北京瑞恒新源投资有限公司 | Capacitive cable terminal without insulating medium filling |
| CN108521112A (en) * | 2018-05-18 | 2018-09-11 | 常州安凯特电力器件有限公司 | High pressure dry insulated power cable device end |
| CN209545119U (en) * | 2018-12-14 | 2019-10-25 | 香港浩岳国际有限公司 | Cable termination |
-
2018
- 2018-12-14 CN CN201811535997.5A patent/CN111327013B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3439110A (en) * | 1968-06-04 | 1969-04-15 | G & W Electric Speciality Co | Prefabricated stress control shield |
| EP0732791A1 (en) * | 1995-03-13 | 1996-09-18 | ABBPATENT GmbH | Device for exerting a pressure on a resilient stress control cone |
| JP2003189454A (en) * | 2001-12-19 | 2003-07-04 | Mitsubishi Cable Ind Ltd | Capacitor cone |
| CN1710766A (en) * | 2004-06-16 | 2005-12-21 | 王日新 | Prefabricated dry-type capacity type cable terminal |
| CN2912054Y (en) * | 2006-04-24 | 2007-06-13 | 王钰 | Prefabricating high voltage cable terminal |
| CN105743053A (en) * | 2014-12-08 | 2016-07-06 | 北京瑞恒新源投资有限公司 | Capacitive cable terminal without insulating medium filling |
| CN108521112A (en) * | 2018-05-18 | 2018-09-11 | 常州安凯特电力器件有限公司 | High pressure dry insulated power cable device end |
| CN209545119U (en) * | 2018-12-14 | 2019-10-25 | 香港浩岳国际有限公司 | Cable termination |
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| Publication number | Publication date |
|---|---|
| CN111327013A (en) | 2020-06-23 |
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