CN117878820A - Intermediate connector for rush repair of ultra-high voltage cable and mounting method thereof - Google Patents
Intermediate connector for rush repair of ultra-high voltage cable and mounting method thereof Download PDFInfo
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- CN117878820A CN117878820A CN202410223038.9A CN202410223038A CN117878820A CN 117878820 A CN117878820 A CN 117878820A CN 202410223038 A CN202410223038 A CN 202410223038A CN 117878820 A CN117878820 A CN 117878820A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- 239000012212 insulator Substances 0.000 claims abstract description 20
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 17
- 210000001503 joint Anatomy 0.000 claims abstract 2
- 239000004020 conductor Substances 0.000 claims description 49
- 238000007789 sealing Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 241000722921 Tulipa gesneriana Species 0.000 claims 1
- 238000009413 insulation Methods 0.000 abstract description 31
- 230000005684 electric field Effects 0.000 abstract description 10
- 239000004945 silicone rubber Substances 0.000 abstract description 6
- 238000004870 electrical engineering Methods 0.000 abstract description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 5
- 229920003020 cross-linked polyethylene Polymers 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
Classifications
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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
- H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
- H02G15/24—Cable junctions
-
- 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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
-
- 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
- H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
- H02G15/30—Cable fittings for cables filled with or surrounded by gas or oil with devices for relieving electrical stress
Landscapes
- Cable Accessories (AREA)
Abstract
The invention belongs to the technical field of electrical engineering, and discloses an intermediate connector for rush repair of an ultra-high voltage cable and an installation method thereof; the middle joint for the ultra-high voltage cable rush-repair is of a three-section structure and comprises a first cable access section, a cable connection section and a second cable access section, wherein the cable connection section is arranged between the first cable access section and the second cable access section; the first cable access section and the second cable access section have the same structure and comprise a first shell, an end cover, a silicon rubber stress taper sleeve and a basin-type insulator; the cable connecting section comprises a second shell and a metal connecting piece, and the metal connecting piece is arranged in the second shell; the first shell and the second shell are both provided with an inflation valve for inflating SF 6 And (3) gas. The technical scheme provided by the invention is based on SF 6 The gas insulation has designed the syllogic structure, has used the stress taper sleeve of silicone rubber, can solve the problem of semi-conductive layer fracture electric field distortion and cable electrical connection realization, can be used to the quick rush repair of superhigh pressure cable.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, relates to the field of cable rush-repair, and in particular relates to an intermediate connector for ultra-high voltage cable rush-repair and an installation method thereof.
Background
The use of high voltage transmission cables in cities has increased year by year, and its safe operation is critical for stable supply of electricity. In the practical application process, the power cable is inevitably broken down, after the cable breaks down, the cable is required to be salvaged, namely the cable is replaced, and the cable is connected by utilizing a cable connector.
In the traditional rush-repair scheme, a silicone rubber prefabricated cable joint is generally used, the time for installing the joint is extremely long, and a large amount of preparation work is needed in the early stage, so that the quick rush-repair after the cable failure is not facilitated; compared with a silicon rubber prefabricated cable joint, the cable connection can be realized more quickly by adopting a gas insulation scheme. The principle is explained, the silicone rubber prefabricated cable joint is solid insulation, and a great amount of time is needed to complete related work on site in order to ensure the cleanness and the close fitting of a solid contact surface; in the gas atmosphere, the requirement on the cable insulation surface is lower, and the connection of the cable can be completed in a shorter time on the premise of ensuring the basic insulation performance of the cable joint. Specific examples illustratively use gas insulation to achieve cable intermediate connector connections, cable test termination connections, there are the following cases: the university of Wuhan and Guangdong power grid designs a 110kV XLPE cable GIS inner cone plug-in type quick intermediate joint, and the installation of cable accessories can be completed within 4 hours by using a cable terminal Gas Insulated Switch (GIS) technology; the Nanjing power supply company develops a 220kV high-voltage cable gas test terminal which is integrally prefabricated and repeatedly plugged and unplugged for many times, and performs field application in a certain 220kV cable line engineering handover test in Nanjing.
In the prior art, aiming at the research of cable quick repair, SF is mostly adopted 6 Compared with a silicon rubber prefabricated cable joint, the gas insulation type cable joint has the advantage of high power supply recovery speed, and is suitable for short-time quick repair. However, there is currently no fast rush-repair connector device proposed for ultra-high voltage power cables (e.g., 330kV ultra-high voltage power cables); in the process of designing the high-voltage-class cable quick repair connector, the core problems to be solved are control of local electric field distortion points and realization of cable electrical connection.
Disclosure of Invention
The invention aims to provide an intermediate connector for rush repair of an ultra-high voltage cable and an installation method thereof, so as to solve one or more technical problems. The technical scheme provided by the invention is based on SF 6 The gas insulation has designed the syllogic structure, has used the stress taper sleeve of silicone rubber, can solve the problem of semi-conductive layer fracture electric field distortion and cable electrical connection realization, can be used to the quick rush repair of superhigh pressure cable.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides an intermediate joint for rush-repair of an ultra-high voltage cable, which is of a three-section structure and comprises a first cable access section, a cable connection section and a second cable access section, wherein the cable connection section is arranged between the first cable access section and the second cable access section; wherein,
the first cable access section and the second cable access section have the same structure and comprise a first shell, an end cover, a silicon rubber stress taper sleeve and a basin-type insulator; the cable connecting section comprises a second shell and a metal connecting piece, and the metal connecting piece is arranged in the second shell; the first shell and the second shell are both provided with an inflation valve, and the inflation valve is used for inflating SF 6 A gas;
the end cover is arranged at one end of the first shell, a through hole is formed in the end cover and used for penetrating a cable to be connected, and the other end of the first shell is fixedly and hermetically connected with one end of the second shell; the silicon rubber stress taper sleeve is used for being sleeved at the fracture of the semi-conductive shielding layer of the cable to be connected; the basin-type insulator comprises a cable fixing seat and a conductor leading-out end, and the conductor leading-out end is used for being electrically connected with the metal connecting piece; the cable fixing seat comprises an insulating piece and a central conductor insert, the connecting part of the insulating piece is used for being fixedly arranged at the connecting part of the first shell and the second shell, the central conductor insert is fixedly arranged at the clamping part of the insulating piece, and the central conductor insert is electrically connected with the conductor leading-out end; the central conductor insert is provided with a contact, the contact is electrically connected with the central conductor insert, and the contact is used for realizing the electrical connection between a cable core of a cable to be connected and the central conductor insert.
The technical scheme of the invention is further improved in that a cable fastening device and a sealing piece are arranged at the through hole of the end cover.
According to the technical scheme, the cable fastening device is a limiter, and the sealing element is a sealing ring.
The technical scheme of the invention is further improved in that the two ends of the metal connecting piece are plum blossom-shaped contact structures.
The technical scheme of the invention is further improved in that the contact arranged on the central conductor insert is a plum blossom contact.
The technical scheme of the invention is further improved in that the central conductor insert is further provided with an insulating fixing piece, the contact is arranged in the insulating fixing piece, the insulating fixing piece is fixedly provided with an insulating clamping piece, and the insulating clamping piece is used for being clamped into a groove formed in the surface of a cable insulating layer of a cable to be connected.
According to the technical scheme, the first shell and the second shell are both aluminum alloy shells.
The technical scheme of the invention is further improved in that the insulating piece is made of an epoxy resin composite material.
According to the technical scheme, a flange for connection or support is arranged between the first shell and the second shell.
The invention provides an installation method of an intermediate joint for rush repair of an ultra-high voltage cable, which comprises the following steps:
penetrating the stripped first section of cable to be connected into a first shell of the first cable access section through a through hole of a cover plate of the first cable access section, so that a cable core of the first section of cable to be connected is electrically connected with a contact on a central conductor insert in the first cable access section; fixedly and hermetically connecting a cover plate of the first cable access section with one end of a first shell of the first cable access section; after the conductor leading-out end of the first cable access section is electrically connected with one end of the metal connecting piece, one end of the second shell is fixedly and hermetically connected with the other end of the first shell of the first cable access section;
penetrating the stripped second section of cable to be connected into the first shell of the second cable access section through the through hole of the cover plate of the second cable access section, so that the cable core of the second section of cable to be connected is electrically connected with the contact on the central conductor insert in the second cable access section; fixedly and hermetically connecting a cover plate of the second cable access section with one end of a first shell of the second cable access section; after the conductor leading-out end of the second cable access section is electrically connected with the other end of the metal connecting piece, the other end of the second shell is fixedly and hermetically connected with the other end of the first shell of the second cable access section;
after the first shell and the second shell are vacuumized through the inflation valve, SF is introduced 6 And (5) air, and finishing installation.
Compared with the prior art, the invention has the following beneficial effects:
in the intermediate joint for rush repair of the ultra-high voltage cable, the three-section structure is designed aiming at the problem of narrow space in a cable trench, so that the sectional installation is convenient; the two sections of cables are respectively inserted into the two cable access sections, and then the two lead-out electrodes are connected at the cable connection sections, so that the electric connection of the two sections of cables is realized. According to the invention, aiming at the problem of fracture electric field distortion of the semi-conductive layer, the silicon rubber stress taper sleeve is used for dispersing the electric field at the stress taper, so that the electric field intensity at the fracture of the semi-conductive layer of the cable is reduced.
According to the invention, aiming at the sliding problem of the cable in the device, the fastening device on the basin-type insulator and the fastening device on the end part of the shell are designed, so that the fixation of the cable after installation is realized.
In the invention, aiming at the problem of long field installation period of the conventional prefabricated SiR connector, SF is used in the invention 6 Gas insulation, cable is connected in the shell and then is filled with SF 6 The probability of generating insulation defects in the installation process is low, and the installation speed is high; in addition, SF is used 6 The gas insulation scheme ensures that the cable body and the metal shell have enough insulation strength.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below; it will be apparent to those of ordinary skill in the art that the drawings in the following description are of some embodiments of the invention and that other drawings may be derived from them without undue effort.
FIG. 1 is a schematic diagram of the overall structure of a three-section 330kV quick rush-repair intermediate joint in an embodiment of the invention;
FIG. 2 is a schematic view of a basin-type insulator in accordance with an embodiment of the present invention;
the reference numerals in the drawings are used for the purposes of illustration,
1. a cable to be connected; 2. silicon rubber stress taper sleeve; 3. basin-type insulator; 4. a cable fixing seat; 5. a conductor lead-out terminal; 6. a metal connector; 7. a first housing; 8. a second housing; 9. an inflation valve; 10. an end cap; 11. a cable fastening device; 12. a seal;
201. a cable core; 202. a cable insulation layer; 203. an insulating member; 204. a center conductor insert; 205. plum blossom contact; 206. fastening the connecting piece; 207. an insulating clip; 208. an insulating fixture.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1 and fig. 2, an intermediate joint for rush-repair of an ultra-high voltage cable disclosed in the embodiment of the invention is specifically and exemplarily a three-section 330kV fast rush-repair intermediate joint, and the intermediate joint for rush-repair of the ultra-high voltage cable has a three-section structure and comprises a first cable access section, a cable connection section and a second cable access section; wherein,
the cable connection section is used for being arranged between the first cable access section and the second cable access section;
the first cable access section and the second cable access section comprise a first shell 7, an end cover 10 with a hole in the middle, a silicone rubber stress taper sleeve 2 and a basin-type insulator 3; the cable connecting section comprises a second shell 8 and a metal connecting piece 6, wherein the metal connecting piece 6 is arranged in the second shell 8; in the preferred scheme, the two ends of the metal connecting piece 6 are plum blossom contact structures, and when in use, the conductor leading-out end 5 (such as a metal guide rod) led out by the basin-type insulator 3 can be inserted into the plum blossom contact structures to realize electrical connection;
further illustratively, in the first cable access section or the second cable access section, the silicone rubber stress cone sleeve 2 is used for being sleeved at a fracture of the semiconductive shielding layer of the cable 1 to be connected; the basin-type insulator 3 comprises a cable fixing seat 4 and a conductor leading-out end 5, wherein the conductor leading-out end 5 is used for being electrically connected with the metal connecting piece 6; the cable fixing base 4 comprises an insulating piece 203, a central conductor insert 204 and an insulating fixing piece 208, wherein a connecting part of the insulating piece 203 is used for being fixedly arranged at a connecting part of the first shell 7 and the second shell 8, the central conductor insert 204 is fixedly arranged at a clamping part of the insulating piece 203, and the central conductor insert 204 is electrically connected with the conductor leading-out end 5; the center conductor insert 204 has the insulating fixture 208 disposed thereon, and illustratively, may be fixedly connected by an insulating fastening connection 206 (e.g., a fastening screw, etc.); the insulation fixing piece 208 is used for inserting the cable core 201 of the cable 1 to be connected, the plum blossom contact 205 is arranged in the insulation fixing piece 208, and the plum blossom contact 205 is used for realizing the electrical connection between the cable core 201 and the central conductor insert 204;
in addition, the first housing 7 and the second housing 8 are provided with an inflation valve 9, and the inflation valve 9 is used for inflating SF 6 A gas; the end cover 10 is disposed at one end of the first housing 7, and the end cover 10 is provided with a through hole for penetrating the cable 1 to be connected; showing theIllustratively, the end cap 10 may be secured to the aluminum alloy housing using screws, with holes allowing the cable to pass freely therethrough; in a further preferred version, the through hole is provided with a cable fastening means 11 and a seal 12; exemplary alternatives, the seal 12 may be a gasket; further exemplary, the cable fastening device 11 may be a limiter with a hole in the middle, the cable may pass through the cable, the gap between the cable and the limiter is smaller than 3mm, the cable is fixed with the limiter by using a rubber ring seal, and the limiter is fixed on the end cover 10 by using a screw; the other end of the first housing 7 is fixedly and hermetically connected to one end of the second housing 8 (illustratively, the two first housings 7 in the first cable access section and the second cable access section are respectively connected to two ends of the second housing 8 in the cable connection section), and the connection portion of the insulating member 203 is fixedly disposed between the two flanges connected thereto.
In the technical scheme provided by the embodiment of the invention, the first cable access section and the second cable access section have the same structure, are respectively used for accessing two stripped cables to be connected and are respectively connected with the central conductor inserts of the respective basin-type insulators; the cable connecting section is positioned in the middle and is used for connecting the conductor leading-out end of the first cable access section with the conductor leading-out end of the second cable access section through a metal connecting piece so as to realize the electric connection of the cables. In the intermediate joint for rush repair of the ultra-high voltage cable, the three-section structure is designed aiming at the problem of narrow space in a cable trench, so that the sectional installation is convenient; the two sections of cables are respectively inserted into the two cable access sections, and then the two lead-out electrodes are connected at the cable connection sections, so that the electric connection of the two sections of cables is realized. According to the invention, aiming at the problem of fracture electric field distortion of the semi-conductive layer, the silicon rubber stress taper sleeve is used for dispersing the electric field at the stress taper, so that the electric field intensity at the fracture of the semi-conductive layer of the cable is reduced.
In the embodiment of the present invention, the first housing 7 and the second housing 8 may be aluminum alloy housings.
In an embodiment of the present invention, the material of the insulating member 203 may be an epoxy resin composite material.
In the embodiment of the invention, four plum blossom contacts are used in three sections, so that the restriction on the cable position and the flexible connection on the cable conductor can be realized; the method comprises the steps of carrying out a first treatment on the surface of the And a support flange is arranged between every two sections, so that the cable can be positioned and supported.
Illustratively, the cable 1 to be connected is a stripped cable, and includes a cable core 201 and a cable insulation layer 202; in a further preferred embodiment, a groove is formed on the surface of the cable insulation layer 202, and an insulation clamping member 207 is disposed on the insulation fixing member 208, and the insulation clamping member 207 is used for being clamped into the groove. According to the invention, aiming at the sliding problem of the cable in the device, the fastening device on the basin-type insulator and the fastening device on the end part of the shell are designed, so that the fixation of the cable after installation is realized. Further exemplary, the insulating clip may be inserted into an annular groove cut into the XLPE insulating surface of the cable to fix the position of the cable; in addition, the lead-out metal guide rod is used as a conductor lead-out end to extend into the cable connecting section so as to realize the electrical connection with another section of cable.
The embodiment of the invention is specifically exemplified, and the three-section shell is connected in a screw connection mode, wherein the aluminum alloy shell clamps a basin-shaped insulator for fixing a cable; the screws penetrate through the three parts to fix the mechanical structure.
In the embodiment of the invention, the installation of the cable quick repair connector is realized in the following manner, which comprises the following steps:
step 1, stripping and cutting a cable; the metal shielding layer is peeled and cut to be about 40cm from the head end of the cable, the outer semi-conductive shielding layer is peeled and cut to be about 30cm, and the XLPE main insulation is peeled and cut to be 5cm; open-loop grooves with the width of 5mm and the depth of 3mm are formed on the XLPE surface according to the position of 2cm at the tail end;
step 2, penetrating the cable into the cable fastening device 11, the sealing piece 12 and the end cover 10 in sequence; wherein the end cap 10 (such as an end flange, etc.) and the first housing 7 can be screwed;
step 3, mounting a silicon rubber stress taper sleeve 2 at the fracture of the outer semi-conductive shielding layer, and ensuring that the stress taper region well covers the fracture;
step 4, electrically connecting a cable core 201 (metal conductor) at the end of the cable with a plum blossom contact 205 in an insulation fixing piece 208, inserting an insulation clamping piece 207 in an XLPE groove, and connecting the insulation clamping piece 207 with the insulation fixing piece 208 on the basin-type insulator 3 by using an insulation screw;
step 5, fixing the basin-type insulator 3 with the first shell 7 of the cable access section, fixing the cable fastening device 11 with the end cover 10 by using screws, and ensuring that the sealing element 12 is well attached;
step 6, repeating the operations from the step 1 to the step 5 for the second cable access section;
step 7, sleeving a metal connecting piece on a conductor leading-out end in a first shell of one section of cable access section, and then connecting a second shell, a basin-type insulator and the first shell by using screws;
step 8, inserting the metal conductor leading-out end 5 of the other cable access section into the metal connecting piece 6, and then connecting the second shell, the basin-type insulator and the first shell of the cable access section by using screws;
step 9, opening an inflation valve 9, and vacuumizing the shell by using a vacuum pump; SF of 0.4MPa gauge pressure is then injected 6 A gas;
thus, the installation of the cable repair connector is completed.
In the embodiment of the invention, aiming at the problem of long field installation period of the conventional prefabricated SiR connector, SF is used in the invention 6 Gas insulation, cable is connected in the shell and then is filled with SF 6 The probability of generating insulation defects in the installation process is low, and the installation speed is high; in addition, SF is used 6 The gas insulation scheme ensures that the cable body and the metal shell have enough insulation strength.
In summary, the embodiment of the invention particularly discloses a 330kV ultrahigh voltage cable fault quick rush-repair intermediate joint, which mainly comprises a cable access section and a cable connection section, and integrally adopts SF (sulfur hexafluoride) 6 Gas insulation; in the cable access section, the stripped and cut cable to be connected penetrates into the shell from the end cover, and the sealing structure is used for guaranteeing the air tightness; electric powerThe cable semi-conductive shielding layer uses a silicon rubber stress taper sleeve to disperse an electric field, and the end part of the cable is fixed through a plum blossom contact positioned on a basin-type insulator; in the cable connection section, two sections of electrodes connected to the basin-type insulator are electrically connected by using a metal connecting piece. Further illustratively, when a fault occurs in the field, the cable to be connected is simply stripped and cut, inserted into the intermediate connector disclosed by the embodiment of the invention and filled with SF 6 The rapid repair of the fault cable can be realized after the gas is discharged; compared with the conventional prefabricated cable intermediate connector, the intermediate connector disclosed by the embodiment of the invention can recover power supply in a short time and reduce loss caused by long-time power failure.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The middle joint for the rush-repair of the ultra-high voltage cable is characterized by comprising a three-section structure, a first cable access section, a cable connection section and a second cable access section, wherein the cable connection section is arranged between the first cable access section and the second cable access section; wherein,
the first cable access section and the second cable access section have the same structure and comprise a first shell (7), an end cover (10), a silicon rubber stress taper sleeve (2) and a basin-type insulator (3); the cable connecting section comprises a second shell (8) and a metal connecting piece (6), wherein the metal connecting piece (6) is arranged in the second shell (8); the first shell (7) and the second shell (8) are both provided with an inflation valve (9);
the end cover (10) is arranged at one end of the first shell (7) in the first cable access section or the second cable access section, the end cover (10) is provided with a through hole, the through hole is used for penetrating a cable to be connected, and the other end of the first shell (7) is fixedly and hermetically connected with one end of the second shell (8); the silicon rubber stress taper sleeve (2) is used for being sleeved at the fracture of the semi-conductive shielding layer of the cable to be connected; the basin-type insulator (3) comprises a cable fixing seat (4) and a conductor leading-out end (5), and the conductor leading-out end (5) is used for being electrically connected with the metal connecting piece (6); the cable fixing seat (4) comprises an insulating piece (203) and a central conductor insert (204), the connecting part of the insulating piece (203) is used for being fixedly arranged at the connecting part of the first shell (7) and the second shell (8), the central conductor insert (204) is fixedly arranged at the clamping part of the insulating piece (203), and the central conductor insert (204) is electrically connected with the conductor leading-out end (5); the central conductor insert (204) is provided with a contact, the contact is electrically connected with the central conductor insert (204), and the contact is used for realizing the electrical connection between a cable core of a cable to be connected and the central conductor insert (204).
2. An intermediate joint for emergency repair of ultra-high voltage cables according to claim 1, characterized in that the through hole of the end cap (10) is provided with a cable fastening device (11) and a sealing member (12).
3. An intermediate head for emergency repair of ultra-high voltage cables according to claim 2, characterized in that the cable fastening means (11) are limiters and the sealing element (12) is a sealing ring.
4. The intermediate head for rush-repair of an ultra-high voltage cable according to claim 1, wherein both ends of the metal connecting piece (6) are of a quincuncial contact structure.
5. An intermediate connector for emergency repair of ultra high voltage cables according to claim 1, characterized in that the contacts provided on the central conductor insert (204) are tulip contacts (205).
6. The intermediate head for rush-repair of an ultra-high voltage cable according to claim 1, wherein an insulating fixing member (208) is further arranged on the central conductor insert member (204), the contact is arranged in the insulating fixing member (208), an insulating clamping member (207) is fixedly arranged on the insulating fixing member (208), and the insulating clamping member (207) is used for being clamped into a groove formed in the surface of a cable insulating layer of a cable to be connected.
7. An intermediate head for emergency repair of ultra-high voltage cables according to claim 1, characterized in that the first housing (7) and the second housing (8) are both aluminium alloy housings.
8. An intermediate joint for emergency repair of ultra-high voltage cables according to claim 1, characterized in that the material of the insulating member (203) is an epoxy resin composite material.
9. An intermediate head for emergency repair of ultra-high voltage cables according to claim 1, characterized in that a flange for connection or support is arranged between the first housing (7) and the second housing (8).
10. A method of installing an intermediate head for emergency repair of an ultra-high voltage cable according to claim 1, comprising the steps of:
penetrating the stripped first section of cable to be connected into a first shell of the first cable access section through a through hole of a cover plate of the first cable access section, so that a cable core of the first section of cable to be connected is electrically connected with a contact on a central conductor insert in the first cable access section; fixedly and hermetically connecting a cover plate of the first cable access section with one end of a first shell of the first cable access section; after the conductor leading-out end of the first cable access section is electrically connected with one end of the metal connecting piece, one end of the second shell is fixedly and hermetically connected with the other end of the first shell of the first cable access section;
penetrating the stripped second section of cable to be connected into the first shell of the second cable access section through the through hole of the cover plate of the second cable access section, so that the cable core of the second section of cable to be connected is electrically connected with the contact on the central conductor insert in the second cable access section; fixedly and hermetically connecting a cover plate of the second cable access section with one end of a first shell of the second cable access section; after the conductor leading-out end of the second cable access section is electrically connected with the other end of the metal connecting piece, the other end of the second shell is fixedly and hermetically connected with the other end of the first shell of the second cable access section;
after the first shell and the second shell are vacuumized through the inflation valve, SF is introduced 6 And (5) air, and finishing installation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410223038.9A CN117878820A (en) | 2024-02-28 | 2024-02-28 | Intermediate connector for rush repair of ultra-high voltage cable and mounting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410223038.9A CN117878820A (en) | 2024-02-28 | 2024-02-28 | Intermediate connector for rush repair of ultra-high voltage cable and mounting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117878820A true CN117878820A (en) | 2024-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410223038.9A Pending CN117878820A (en) | 2024-02-28 | 2024-02-28 | Intermediate connector for rush repair of ultra-high voltage cable and mounting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117878820A (en) |
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2024
- 2024-02-28 CN CN202410223038.9A patent/CN117878820A/en active Pending
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