CN102570375B - High-voltage three-phase distribution cable branch joint - Google Patents
High-voltage three-phase distribution cable branch joint Download PDFInfo
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- CN102570375B CN102570375B CN201210012246.1A CN201210012246A CN102570375B CN 102570375 B CN102570375 B CN 102570375B CN 201210012246 A CN201210012246 A CN 201210012246A CN 102570375 B CN102570375 B CN 102570375B
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- 210000001503 joint Anatomy 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 65
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The invention relates to a high-voltage three-phase distribution cable branch joint, which is used for urban underground distribution cables. When the high-voltage three-phase distribution cable branch joint is used in a main distribution line, two main line plugs are respectively connected with one end part of one three-phase main cable and are respectively inserted into two opposite connecting ports arranged on a T-shaped inserting joint, and three cone inserting rods in the main line plugs correspondingly connected with three single-phase main cables are respectively inserted into three main line inserting holes arranged in the connecting ports. At the moment, the branch joint is used as a butt joint of the two three-phase main cables. When the branch joint is used as a three-phase branching joint, the third connecting port of the T-shaped inserting joint is a branch port, branch plugs are connected with the end parts of three single-phase branch cables, and three inserting rods of the branch plugs are correspondingly inserted into three branch inserting holes of the branch port of the T-shaped inserting joint. The high-voltage three-phase distribution cable branch joint has a simple structure and reliable connection, and the construction is convenient and the manpower and material resources are saved during midway entrance electricity-consumption.
Description
Technical Field
The invention relates to a high-voltage three-phase distribution cable branch joint for solving the problem of branching of urban underground distribution cable lines.
Background
In urban network reconstruction, the main lines of power transmission and distribution are generally buried or placed in cable trenches. Therefore, under the environmental constraint, it is difficult to add a branch line to the existing underground distribution cable line. On the other hand, the three-phase cable has high hardness, is not easy to bend, is difficult to move and causes difficulty to construction.
The existing underground power transmission and distribution lines use ground branch boxes (stations) to solve the problem of line branching. However, the ground branch box (station) generally needs to be preset, so that the cost is high and the occupied area is large; once the electricity needs to be branched and connected to the house midway on the main line, the problem that a branch box (station) is needed to be arranged from a remote wiring or is additionally arranged is solved, and the operation is inconvenient.
Disclosure of Invention
Aiming at the defects of the existing underground power transmission and distribution line, the invention aims to provide a high-voltage three-phase power distribution cable branch joint which is reasonable in structure, safe, reliable and convenient to install, and realizes butt joint of three-phase cables on a main line; and a branch cable can be connected through a branch interface, so that the problem that the electricity consumption of a newly added user is increased midway in the main line is solved.
In order to achieve the purpose, the technical scheme of the invention is to provide a high-voltage three-phase distribution cable branch joint. The branch joint comprises a T-shaped plug joint, two main line plugs which have the same structure and are oppositely arranged, and a branch line plug; wherein,
the two main line plugs are respectively connected to the end parts of a three-phase main cable; the two main line plugs are respectively inserted into two oppositely arranged connecting ports on the T-shaped plug so as to form the butt joint of the two three-phase main cables;
each main line plug is further provided with:
the three-phase main cable penetrates through the tail sleeve and is divided into three single-phase main cables;
the two ends of the tail threaded sleeve are respectively sleeved outside a waterproof sleeve arranged on the front part of the three-phase main cable and outside the rear end of the tail sleeve, and the tail threaded sleeve is fixedly connected with the tail sleeve;
the three single-phase main cables penetrate through the middle outer sleeve and are correspondingly connected with three cone inserted rods arranged at the front end inside the main line plug; the front ends of the three cone insertion rods are correspondingly inserted into three main line insertion holes arranged in a connecting port of the T-shaped plug connector;
the two ends of the middle threaded sleeve are respectively sleeved outside the contact position of the front end of the tail sleeve and the rear end of the middle outer sleeve, and the middle threaded sleeve is fixedly connected with a middle connecting sleeve embedded at the rear end of the middle outer sleeve;
the two ends of the front threaded sleeve are respectively sleeved outside the position where the front end of the middle outer sleeve is contacted with the T-shaped plug connector, and the front threaded sleeve is fixedly connected with a front connecting sleeve embedded at the rear end of the T-shaped plug connector;
the T-shaped plug is also provided with a branch port, and the branch line plug is correspondingly inserted into the branch port; when the branch circuit plug is not connected, the branch port is insulated and sealed; three-phase branch jacks are arranged in the branch ports, and three-phase insertion rods arranged at the front ends of the inner parts of the branch road plugs are correspondingly inserted into the three-phase branch jacks; the three single-phase branch cables penetrate into the branch plug and are correspondingly connected to the rear ends of the three-phase plug pins;
the branch circuit plug is also provided with a branching threaded sleeve, two ends of the branching threaded sleeve are respectively sleeved outside the front end of the branch circuit plug and the rear end of the branch port of the T-shaped plug connector, and the branching threaded sleeve is fixedly connected with a branching connecting sleeve embedded at the rear end of the branch port of the T-shaped plug connector.
A group of upper and lower wire clamps which are oppositely arranged are arranged behind the tail sleeve, and the upper and lower wire clamps of the group are fastened outside the three-phase main cable through a plurality of screws after the three-phase main cable passes through a gap formed between the upper and lower wire clamps;
three single-phase main cables are divided from the three-phase main cables, and three openings respectively formed on a branching cone, a branching locking plate and a branching plate sequentially penetrate through the front part in the tail sleeve;
after the three single-phase main cables are respectively arranged at the front parts of the three openings on the branching cone in a penetrating manner, the three locking sleeves are correspondingly arranged outside the three single-phase main cables; and then the distributing locking plate is arranged at the rear ends outside the three locking sleeves and is fastened, and the distributing plate is arranged at the front ends outside the three locking sleeves and is fastened.
Three connecting insulation sleeves are arranged in the middle outer sleeve; the rear end in each connecting insulating sleeve is provided with a stress cone; the front part in each connecting insulating sleeve is provided with a stress sleeve, so that each single-phase main cable penetrates out of the tail sleeve, passes through the stress cone and is correspondingly inserted into the connecting insulating sleeve and the stress sleeve at the front part of the connecting insulating sleeve; and the middle outer sleeve is also internally provided with a positioning sleeve, and the front parts of the three connecting insulating sleeves are wrapped together from the outside.
The front end of each single-phase main cable is an exposed core wire which is connected with a corresponding cone inserted rod in the stress sleeve 11; each of the cone plungers further comprising:
the core wire is inserted into the rear end of the copper core connecting sleeve;
the front end of the copper core connecting sleeve is inserted into the rear part of the conical copper core connector;
the screw is connected to the front part of the copper core connecting sleeve from the front end in the copper core connecting head and connects the copper core connecting sleeve and the copper core connecting sleeve;
and conductive contact is formed among the core wire of the single-phase main cable, the copper core connecting sleeve and the copper core connector.
A plurality of connecting rods are arranged in the T-shaped plug connector, and the part of each connecting rod, which exceeds the rear end of the T-shaped plug connector, is inserted into the middle outer sleeve during butt joint; and the rear end of each connecting rod is provided with a screw rod, and the screw rod penetrates through the positioning sleeve in the middle outer sleeve to enable the rear end of the screw rod to be connected with a nut.
The foremost ends of the connecting insulating sleeves and the cone inserted bars respectively exceed the foremost end of the middle outer sleeve and are inserted into the corresponding main line jack on the T-shaped plug connector;
each cone inserted rod is directly inserted into the copper core of a corresponding phase in the main line jack to form conductive contact; three-phase copper cores corresponding to the two butted three-phase main cables are mutually conducted in the T-shaped plug;
an insulating layer is correspondingly arranged outside each phase of copper core, and a gasket sleeved on the cone inserted rod is arranged between the rear end of the insulating layer of each phase of copper core and the front end of the stress sleeve; the front end of the connecting insulating sleeve extends for a certain distance in the main wire jack, and is inserted between the outer wall of the T-shaped plug connector and the insulating layer.
Three branch copper cores are correspondingly arranged in three branch jacks of a branch port of the T-shaped plug connector, and each phase of branch copper core is mutually communicated with a corresponding phase of copper core in the three-phase main cable in the T-shaped plug connector;
in each branch jack, a spring ring is arranged at the rear part in the branching copper core, the rear end of the spring ring is contacted with the front end of a branching sleeve, and the front half part of the branching sleeve is also arranged in the branching copper core;
the rear end of each branching copper core is contacted with the front end of one branching outer sleeve, and the rear half part of each branching outer sleeve is arranged in the corresponding branching outer sleeve; an insulating layer for separating three phases is arranged outside the branching copper core and the branching outer sleeve;
the opening position of each branch jack on the T-shaped plug is also provided with a branching inner sleeve, the front half part of the branching inner sleeve is positioned in the branch jack, and the front end of the branching inner sleeve is contacted with the rear end of the insulating layer; the rear half part of the branching inner sleeve is sleeved on the corresponding inserted rod of the T-shaped plug.
In the branch plug, a core wire exposed at the front end of each single-phase branch cable is inserted into the rear part of a corresponding phase insertion rod; a branching insulating sleeve is arranged between each phase inserted link and the branch circuit plug; the branching insulating sleeve is positioned outside the rear half part of the branching inner sleeve and outside the connecting position of the core wire of the cable and the inserted bar;
when the front part of each phase of inserted bar is inserted into the corresponding branch jack, the front part of each phase of inserted bar sequentially passes through the branching inner sleeve, the insulating layer, the branching outer sleeve, the branching sleeve and the spring ring, and finally the foremost part of the inserted bar is inserted into the branching copper core, and the core wire in the inserted bar is in conductive contact with the branching copper core.
A first O-shaped rubber ring is arranged between the rear end of the tail sleeve and the surface of the tail screw sleeve in contact;
a second O-shaped rubber ring is arranged between the surfaces of the rear end of the middle connecting sleeve and the front end of the tail sleeve;
the foremost end of the middle outer sleeve is also provided with a front retainer ring, and a third O-shaped rubber ring is arranged between the surfaces of the front retainer ring and the front connecting sleeve at the rearmost end of the connecting hole of the T-shaped plug connector, which are in contact with each other;
the most front end of the branch line plug is provided with a branching check ring, and a fourth O-shaped rubber ring is arranged between the surfaces of the branching check ring, which are contacted with the branching connecting sleeve at the rearmost end of the branch port.
The high-voltage three-phase distribution cable branch joint solves the problem that the existing underground power transmission and distribution line is difficult to arrange branch lines, and has the advantages that: the butt joint can be used as a butt joint of a three-phase cable on a power transmission and distribution main line; because the cone inserted bars are adopted, the butt joint length is shortened, and children with the cone inserted bars on the two opposite sides can be in butt joint in a space of 60 mm; after the three-phase cables are butted, the interior of the connector is fastened by using a screw rod and the like, and the exterior of the connector is provided with a threaded sleeve for fastening, so that the connector is safe and reliable. Meanwhile, the invention can also be used as a three-phase branching connector to connect a direct-insert branch circuit plug, has small groove turning area in construction, lightens labor intensity and saves manpower and material resources.
Drawings
FIG. 1 is a schematic diagram of the general structure of the high voltage three phase distribution cable branch joint of the present invention after the connection of the various components;
figure 2 is an exploded view of a breakout connection of the high voltage three phase distribution cable of figure 1;
fig. 3 is an enlarged view of the left half of the high voltage three phase distribution cable branch connector of fig. 1, wherein a cross-section of the T-shaped connector is shown at the corresponding connection position with the main line plug and the branch line plug.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and fig. 2, the high-voltage three-phase distribution cable branch connector (hereinafter referred to as a branch connector) of the present invention includes a T-shaped plug connector 1 as a three-phase assembly, two main line plugs having the same structure and disposed opposite to each other, and an in-line branch plug 42. Hereinafter, the end of the main line plug and the branch line plug 42 close to the corresponding connection port on the T-shaped connector 1 is referred to as a "front end", the end far from the corresponding connection port on the T-shaped connector 1 is referred to as a "rear end", for example, when viewed from the direction shown in the drawing, the right end of the left main line plug is the front end, the upper end of the branch line plug 42 is the front end, and the like.
When the branch joint is used in a power transmission and distribution main line, the two main line plugs are respectively connected to the end part of one three-phase main cable, and are respectively inserted into two oppositely arranged connectors on the T-shaped plug connector 1, so that three cone inserted rods correspondingly connected with three single-phase main cables in each main line plug are respectively inserted into three main line inserting holes arranged in the corresponding connectors; in this case, the present invention is used as a butt joint for the two three-phase main cables.
In addition, the third connecting port of the T-shaped connector 1 is a branch port, and if the direction-changing branch is not needed, the branch port is insulated and sealed. If the direction-changing branch is needed, the branch line plug 42 is connected to the end part of the branch cable, and the three plug rods 40 of the branch line plug 42 are correspondingly inserted into the three branch jacks of the branch port of the T-shaped plug connector 1, at this time, the three-phase branching connector also serves as a three-phase branching connector.
Referring to fig. 1 to 3, a three-phase main cable is divided into three single-phase main cables in a tail sleeve 22 of one main line plug, and specifically, a set of upper and lower clamps 25A, 25B are oppositely arranged behind the tail sleeve 22, so that after the main cable with the outermost protective sleeve removed passes through a gap formed between the upper and lower clamps 25A, 25B, the set of upper and lower clamps 25A, 25B are fastened outside the main cable through a plurality of screws 25. The three-phase main cable is externally fitted with a rubber waterproof jacket 26, and the waterproof jacket 26 is arranged at a distance rearward from the rear ends of the upper and lower clamps 25A, 25B.
A tail screw sleeve 24 is arranged outside the positions of the upper wire clamp 25A and the lower wire clamp 25B, one end of the tail screw sleeve 24 is fixedly connected with the tail sleeve 22, and the other end is sleeved outside the front part of the waterproof sleeve 26. The tail thread insert 24 and the tail thread insert 22 are both of a double-layer structure, for example, the outer layer is made of rubber, and the inner layer is made of stainless steel. An O-shaped rubber ring 23 with a waterproof function is arranged between the connecting contact surfaces of the tail sleeve 22 and the tail threaded sleeve 24, and a groove can be formed in the tail sleeve 22 to mount the O-shaped rubber ring 23.
The front part in the tail sleeve 22 is provided with a rubber branching cone 21, and three openings are formed on the rubber branching cone; after each single-phase main cable passes through the corresponding opening, a copper locking sleeve 20 is arranged outside the single-phase main cable, and at the moment, a copper shielding layer on the outer surface of the single-phase main cable is reserved on the single-phase main cable. Then, correspondingly and sequentially inserting the three single-phase main cables and the locking sleeve 20 outside the single-phase main cables into the three openings formed in the distributing locking plate 19 and the three openings formed in the distributing plate 18; a plurality of screws 18A and 19A are respectively connected with the aluminum branching locking plate 19 and the aluminum branching plate 18, so that the branching locking plate 19 is fastened at the rear ends outside the three locking sleeves 20, and each single-phase main cable is fastened through the branching locking plate 19; similarly, the splitter plate 18 is secured at the front end outside the locking sleeve 20 of the three single phase main cables. The branching cone 21, the branching locking plate 19, the branching plate 18 and each locking sleeve 20 are each made up of two parts, the two parts of each part being arranged opposite one another and between which one or three openings are formed in the part for the single-phase main cables to pass through.
Three single-phase main cables penetrate out of the tail sleeve 22 and then correspondingly penetrate into a rubber middle outer sleeve 13, so that each single-phase main cable is connected with a corresponding cone inserted rod in the middle outer sleeve 13. Specifically, three silica gel connection insulation sleeves 12 are arranged in the middle outer sleeve 13, a stress cone 15 made of semiconductor rubber is arranged at the rear end of each connection insulation sleeve 12, and the rear end of each stress cone 15 is in contact with the front ends of the branching cone 21 and the branching plate 18 thereof, so that each single-phase main cable correspondingly penetrates through the stress cone 15 and enters the connection insulation sleeves 12 after penetrating out of the branching plate 18 of the tail sleeve 22.
A stainless steel middle connecting sleeve 14 is embedded at the rear end of the middle outer sleeve 13; two ends of a middle threaded sleeve 17 are respectively sleeved at the front end of the tail sleeve 22 and the part of the middle connecting sleeve 14 exposed out of the rear end of the middle jacket 13, and the middle threaded sleeve 17 is connected with the middle connecting sleeve 14. A waterproof O-shaped rubber ring 16 is disposed at a position where the rear end of the middle connecting sleeve 14 contacts with the front end of the tail sleeve 22, for example, a groove is formed on a flange surface of the middle connecting sleeve 14 to mount the O-shaped rubber ring 16. The middle thread insert 17 may be a double-layer structure, for example, the outer layer is made of rubber, and the inner layer is made of stainless steel.
A stress sleeve 11 made of semiconductor silica gel is arranged at the front part in each connecting insulating sleeve 12, so that each single-phase main cable correspondingly inserts into the connecting insulating sleeve 12 and the stress sleeve 11 at the front part after penetrating out of the stress cone 15. After a certain distance of insertion into the stress sleeve 11, the insulated outer surface of the single-phase main cable is stripped, so that the exposed core wire at the front end of the cable is inserted into the rear end of a copper core connecting sleeve 9 in the stress sleeve 11; the front end of the copper core connecting sleeve 9 is inserted into the rear part of the conical copper core connector 4; the cone inserted bar is also provided with a screw 3, and the screw 3 is connected with the front part of the copper core connecting sleeve 9 from the front end in the copper core connecting head 4 to connect the two. Thus, conductive contact is formed among the core wire of the cable, the copper core connecting sleeve 9 and the copper core connector 4. The front ends of the three connecting insulating sleeves 12 are also wrapped together from the outside by two oppositely disposed portions of the nylon positioning sleeve 10. The stress sleeve 11 and the stress cone 15 can prevent partial discharge caused by creep voltage.
A plurality of connecting rods 29 are arranged in the T-shaped plug connector 1, and the part of each connecting rod 29, which exceeds the rear end of the T-shaped plug connector 1, is inserted into the middle outer sleeve 13 during butt joint; a screw 27 is provided at the rear end of the connecting rod 29, and the rear end of the screw 27 is connected to a nut 28 after the screw 27 passes through the positioning sleeve 10. The foremost end of the inner edge of the middle outer sleeve 13 is also provided with a stainless steel front retainer ring 7, a front connecting sleeve 5 is embedded at the rearmost end of the inner edge of the connecting hole of the T-shaped plug connector 1, and the front retainer ring 7 is in contact with the front connecting sleeve 5. A waterproof O-ring 6 is provided between the two contact surfaces, for example, by providing a groove in the front connection sleeve 5 to mount the O-ring 6. The outside of the contact position is provided with a stainless steel front threaded sleeve 8, two ends of the stainless steel front threaded sleeve 8 are respectively sleeved outside the middle outer sleeve 13 and the T-shaped plug 1, and the front threaded sleeve 8 is fixedly connected with the front connecting sleeve 5 of the T-shaped plug 1.
The foremost ends of the connecting insulating sleeve 12 and the cone inserted bar respectively exceed the foremost end of the middle outer sleeve 13 and are inserted into the corresponding main line jack of the T-shaped plug connector 1; each cone inserted rod is directly inserted into the copper core 2 of a corresponding phase in the main wire insertion hole to form conductive contact; the three-phase copper cores 2 corresponding to the two main cables are conducted with each other in the T-shaped plug 1. An insulating layer is correspondingly arranged outside each phase of copper core 2, and a gasket 43 sleeved on the cone inserted bar is further arranged between the front end of the stress sleeve 11 and the rear end of the insulating layer. The front end of the connecting insulation sleeve 12 extends for a certain distance in the main line jack, and the connecting insulation sleeve 12 is inserted between the outer wall of the T-shaped plug 1 and the insulation layer, so that the insulating isolation function between the three-phase cables is achieved and the three-phase cables are guided and reinforced when the main cable is connected to the T-shaped plug 1.
On the other hand, three branch jacks are formed in the branch port of the T-shaped connector 1, so that the three insertion rods of the branch plug 42 are correspondingly inserted therein, and then the three single-phase branch cables correspondingly connected with the three insertion rods in the branch plug 42 are led out.
Specifically, three branching copper cores 30 are arranged in a branch port of the T-shaped plug 1, and each phase branching copper core 30 is mutually communicated with a corresponding phase copper core 2 in the main cable in the T-shaped plug 1. In each branching jack, a rear portion inside the branching copper core 30 is provided with a spring ring 32, a rear end of the spring ring 32 is in contact with a front end of one branching sleeve 35, and a front half portion of the branching sleeve 35 is also provided inside the branching copper core 30. The rear end of each of the branching copper cores 30 is in contact with the front end of a branching sheath 38 of epoxy resin, and the rear half of the branching sheath 35 is disposed on the branching sheath 38. An insulating layer for separating three phases is provided outside the branching copper core 30 and the branching outer jacket 38. A wire distributing inner sleeve 39 made of silica gel is arranged at the opening position of each branch jack on the T-shaped plug 1, the front half part of the wire distributing inner sleeve 39 is positioned in the branch jack, and the front end of the wire distributing inner sleeve 39 is contacted with the rear end of the insulating layer; the rear half part of the wire distributing inner sleeve 39 is sleeved on the insert rod 40.
In the branch plug 42, the core wire exposed at the front end of each single-phase branch cable is inserted into the rear portion of the corresponding phase plug 40. A branching insulating sleeve 41 is arranged between each phase inserted bar 40 and a rubber branch line plug 42; the splitting insulation cover 41 is specifically positioned outside the rear half part of the splitting inner cover 39 and outside the position where the core wire of the cable is connected with the plug rod 40. When the front part of each phase of the inserted rod 40 is inserted into the corresponding branch jack, the front part of each phase of the inserted rod passes through the branch inner sleeve 39, the insulating layer, the branch outer sleeve 38, the branch sleeve 35 and the spring ring 32 in sequence, and finally the foremost part of the inserted rod 40 is inserted into the branch copper core 30 to form conductive contact with the branch copper core 30.
A branching connecting sleeve 33 is embedded in the edge of the rearmost end of the branching port, and a part of the branching connecting sleeve 33 is exposed outside the T-shaped plug connector 1; the branch line plug 42 is provided with a branch line retaining ring 36 at a position corresponding to the foremost end, and a part of the branch line retaining ring 36 is exposed outside the branch line plug 42. The branching retainer ring 36 contacts with the exposed part of the branching connection sleeve 33, and a waterproof O-shaped rubber ring 34 is disposed between the contact surfaces, for example, a groove is opened on the branching connection sleeve 33 to mount the O-shaped rubber ring 34. The outside of the contact position of the branching check ring 36 and the branching connection sleeve 33 is also provided with a branching threaded sleeve 37, two ends of the branching threaded sleeve 37 are respectively sleeved on the outer walls of the branching ports of the branch line plug 42 and the T-shaped plug 1, and the branching threaded sleeve 37 is fixedly connected with the branching connection sleeve 33. The thread-dividing screw 37 may be a double-layer structure, for example, the outer layer is made of rubber, and the inner layer is made of stainless steel.
The high-voltage three-phase distribution cable branch joint with the structure can be used as a butt joint of a three-phase cable on a distribution main line; because the cone inserted bars are adopted, the butt joint length is shortened, and the cone inserted bars on the two opposite sides can be in butt joint only by 60mm of space; after the three-phase cables are butted, the interior of the connector is fastened by using a screw rod and the like, and the exterior of the connector is provided with a threaded sleeve for fastening, so that the connector is safe and reliable. Meanwhile, the invention can also be used as a three-phase branching connector to connect a direct-insert branch circuit plug, has small groove turning area in construction, lightens labor intensity and saves manpower and material resources.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A high-voltage three-phase distribution cable branch joint is characterized in that,
the branch joint comprises a T-shaped plug joint (1), two main line plugs which have the same structure and are oppositely arranged, and a branch line plug (42); wherein,
the two main line plugs are respectively connected to the end parts of a three-phase main cable; the two main line plugs are respectively inserted into two oppositely arranged connecting ports on the T-shaped plug connector (1) to form the butt joint of the two three-phase main cables;
each main line plug is further provided with:
the three-phase main cable penetrates through the tail sleeve (22) and is divided into three single-phase main cables;
the two ends of the tail threaded sleeve (24) are respectively sleeved outside a waterproof sleeve (26) arranged on the front part of the three-phase main cable and outside the rear end of the tail sleeve (22), and the tail threaded sleeve (24) is fixedly connected with the tail sleeve (22);
the three single-phase main cables penetrate through the middle outer sleeve (13) and are correspondingly connected with three cone inserted rods arranged at the front end inside the main line plug; the front ends of the three cone insertion rods are correspondingly inserted into three main line insertion holes arranged in a connecting port of the T-shaped plug connector (1); wherein, three connecting insulation sleeves (12) are further arranged in the middle outer sleeve (13); the rear end in each connecting insulating sleeve (12) is provided with a stress cone (15); a stress sleeve (11) is arranged at the front part in each connecting insulating sleeve (12), so that each single-phase main cable penetrates out of the tail sleeve (22), passes through the stress cone (15) and is correspondingly inserted into the connecting insulating sleeve (12) and the stress sleeve (11) at the front part of the connecting insulating sleeve;
the two ends of the middle threaded sleeve (17) are respectively sleeved outside the contact position of the front end of the tail sleeve (22) and the rear end of the middle outer sleeve (13), and the middle threaded sleeve (17) is fixedly connected with a middle connecting sleeve (14) embedded at the rear end of the middle outer sleeve (13);
the two ends of the front threaded sleeve (8) are respectively sleeved outside the contact position of the front end of the middle outer sleeve (13) and the T-shaped plug connector (1), and the front threaded sleeve (8) is fixedly connected with a front connecting sleeve (5) embedded at the rear end of the T-shaped plug connector (1) connector;
a branch port is further formed in the T-shaped plug connector (1), and the branch circuit plug (42) is correspondingly inserted into the branch port; when the branch line plug (42) is not connected, the branch port is insulated and sealed; three-phase branch jacks are arranged in the branch ports, and three-phase insertion rods (40) arranged at the front ends of the inner parts of the branch circuit plugs (42) are correspondingly inserted into the three-phase branch jacks; the three single-phase branch cables penetrate into a branch plug (42) and are correspondingly connected to the rear end of a three-phase plug rod (40);
the branch line plug (42) is further provided with a branch line screw sleeve (37), two ends of the branch line plug (42) are respectively sleeved outside the front end of the branch line plug (42) and the rear end of the branch port of the T-shaped plug connector (1), and the branch line screw sleeve (37) is fixedly connected with a branch line connecting sleeve (33) embedded in the rear end of the branch port of the T-shaped plug connector (1).
2. The high voltage three phase distribution cable breakout connection of claim 1,
a group of upper and lower wire clamps (25A, 25B) which are oppositely arranged are arranged behind the tail sleeve (22), and after the three-phase main cable passes through a gap formed between the upper and lower wire clamps (25A, 25B), the group of upper and lower wire clamps (25A, 25B) are fastened outside the three-phase main cable through a plurality of screws (25);
three single-phase main cables are divided from the three-phase main cables, and three openings respectively formed on a branching cone (21), a branching locking plate (19) and a branching plate (18) sequentially penetrate through the front part in the tail sleeve (22);
after the three single-phase main cables are respectively arranged at the front parts of the three openings on the branching cone (21) in a penetrating manner, three locking sleeves (20) are correspondingly arranged outside the three single-phase main cables; and then the distributing locking plate (19) is arranged at the rear ends outside the three locking sleeves (20) and is fastened, and the distributing plate (18) is arranged at the front ends outside the three locking sleeves (20) and is fastened.
3. The high voltage three phase distribution cable breakout connection of claim 2,
the middle outer sleeve (13) is also internally provided with a positioning sleeve (10) which wraps the front parts of the three connecting insulating sleeves (12) from the outside.
4. The high voltage three phase distribution cable breakout connection of claim 3,
the front end of each single-phase main cable is an exposed core wire which is connected with a corresponding cone inserted rod in the stress sleeve (11); each of the cone plungers further comprising:
the copper core connecting sleeve (9), the core wire is inserted into the back end of the copper core connecting sleeve (9);
the front end of the copper core connecting sleeve (9) is inserted into the rear part of the conical copper core connecting head (4);
the screw (3) is connected to the front part of the copper core connecting sleeve (9) from the front end in the copper core connecting head (4) all the way, and the screw (3) is connected with the copper core connecting sleeve;
and conductive contact is formed among the core wire of the single-phase main cable, the copper core connecting sleeve (9) and the copper core connector (4).
5. The high voltage three phase distribution cable breakout connection of claim 4,
a plurality of connecting rods (29) are arranged in the T-shaped plug connector (1), and the part of each connecting rod (29) which exceeds the rear end of the T-shaped plug connector (1) is inserted into the middle outer sleeve (13) during butt joint; and the rear end of each connecting rod (29) is provided with a screw rod (27), and the rear end of each screw rod (27) is connected with a nut (28) after the screw rods (27) penetrate through the positioning sleeves (10) in the middle outer sleeves (13).
6. The high voltage three phase distribution cable breakout connection of claim 5,
the foremost ends of the connecting insulating sleeves (12) and the cone inserted bars respectively exceed the foremost end of the middle outer sleeve (13) and are inserted into corresponding main line jacks on the connecting port of the T-shaped plug connector (1);
each cone inserted rod is directly inserted into the copper core (2) of a corresponding phase in the main wire insertion hole to form conductive contact; three-phase copper cores (2) corresponding to the two butted three-phase main cables are mutually conducted in the T-shaped plug connector (1);
an insulating layer is correspondingly arranged outside each phase copper core (2), and a gasket (43) sleeved on the cone inserted bar is arranged between the rear end of the insulating layer of each phase copper core (2) and the front end of the stress sleeve (11); the front end of the connecting insulating sleeve (12) extends for a certain distance in the main wire jack, and the front end of the connecting insulating sleeve (12) is inserted between the outer wall of the T-shaped plug connector (1) and the insulating layer.
7. The high voltage three phase distribution cable breakout connection of claim 6,
three branch copper cores (30) are correspondingly arranged in three branch jacks of branch ports of the T-shaped plug connector (1), and each phase of branch copper core (30) is communicated with a corresponding phase of copper core (2) in the three-phase main cable in the T-shaped plug connector (1);
in each branch jack, a spring ring (32) is arranged at the rear part in the branching copper core (30), the rear end of the spring ring (32) is contacted with the front end of a branching sleeve (35), and the front half part of the branching sleeve (35) is also arranged in the branching copper core (30);
the rear end of each branching copper core (30) is contacted with the front end of one branching outer sleeve (38), and the rear half part of each branching sleeve (35) is arranged in the corresponding branching outer sleeve (38); an insulating layer for separating three phases is arranged outside the branching copper core (30) and the branching outer sleeve (38);
the opening position of each branch jack on the T-shaped plug (1) is also provided with a branching inner sleeve (39), the front half part of the branching inner sleeve (39) is positioned in the branch jack, and the front end of the branching inner sleeve (39) is contacted with the rear end of the insulating layer; the rear half part of the branching inner sleeve (39) is sleeved on a corresponding insert rod (40) of the T-shaped plug connector (1).
8. The high voltage three phase distribution cable breakout connection of claim 7,
in the branch plug (42), the core wire exposed at the front end of each single-phase branch cable is inserted into the rear part of the corresponding phase plug rod (40); a branching insulating sleeve (41) is arranged between each phase plug rod (40) and the branch circuit plug (42); the branching insulating sleeve (41) is positioned outside the rear half part of the branching inner sleeve (39) and outside the connecting position of the core wire of the cable and the inserted rod (40);
when the front part of each phase of the inserted rod (40) is inserted into the corresponding branch jack, the front part of each phase of the inserted rod sequentially passes through the branching inner sleeve (39), the insulating layer, the branching outer sleeve (38), the branching sleeve (35) and the spring ring (32), finally, the foremost part of the inserted rod (40) is inserted into the branching copper core (30), and the core wire in the inserted rod (40) is in conductive contact with the branching copper core (30).
9. The high voltage three phase distribution cable breakout connection of claim 8,
a first O-shaped rubber ring (23) is arranged between the surfaces of the rear end of the tail sleeve (22) and the tail threaded sleeve (24) which are in contact;
a second O-shaped rubber ring (16) is arranged between the surfaces of the rear end of the middle connecting sleeve (14) and the front end of the tail sleeve (22) in contact;
the foremost end of the middle outer sleeve (13) is also provided with a front retainer ring (7), and a third O-shaped rubber ring (6) is arranged between the surfaces of the front retainer ring (7) which are contacted with the front connecting sleeve (5) at the rearmost end of the connecting hole of the T-shaped plug connector (1);
the foremost end of the branch line plug (42) is provided with a branching check ring (36), and a fourth O-shaped rubber ring (34) is arranged between the surfaces of the branching check ring and the branching connection sleeve (33) at the rearmost end of the branch port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210012246.1A CN102570375B (en) | 2011-12-31 | 2012-01-16 | High-voltage three-phase distribution cable branch joint |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110456602.4 | 2011-12-31 | ||
| CN201110456602 | 2011-12-31 | ||
| CN201210012246.1A CN102570375B (en) | 2011-12-31 | 2012-01-16 | High-voltage three-phase distribution cable branch joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102570375A CN102570375A (en) | 2012-07-11 |
| CN102570375B true CN102570375B (en) | 2014-12-10 |
Family
ID=46415118
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200177614U Expired - Fee Related CN202424099U (en) | 2011-12-31 | 2012-01-16 | Branch joint of underground distribution cable |
| CN201210012246.1A Expired - Fee Related CN102570375B (en) | 2011-12-31 | 2012-01-16 | High-voltage three-phase distribution cable branch joint |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200177614U Expired - Fee Related CN202424099U (en) | 2011-12-31 | 2012-01-16 | Branch joint of underground distribution cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN202424099U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2969182T3 (en) * | 2014-04-25 | 2024-05-16 | Kpr Us Llc | Physical shield for ECG electrical connections |
| CN105140730A (en) * | 2015-08-24 | 2015-12-09 | 河北华通线缆集团有限公司 | Low-smoke halogen-free and fire-resistant ready-made branch cable connecting method and connector |
| CN110752575B (en) * | 2019-09-05 | 2020-12-01 | 国网江苏省电力有限公司电力科学研究院 | Three-phase coaxial superconducting cable stress cone |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2828473A (en) * | 1956-01-20 | 1958-03-25 | Angus T High | Emergency electrical junction box |
| CN1169271C (en) * | 1997-08-28 | 2004-09-29 | 徐晓鹰 | Three-phase electrical cable plug-type connector |
| CN2687913Y (en) * | 2004-02-20 | 2005-03-23 | 长沙电缆附件有限公司 | T-shape branch joint for power cable branching |
| CN2692900Y (en) * | 2004-03-16 | 2005-04-13 | 段毅文 | High-voltage cable crosslink assembled branch connector |
-
2012
- 2012-01-16 CN CN2012200177614U patent/CN202424099U/en not_active Expired - Fee Related
- 2012-01-16 CN CN201210012246.1A patent/CN102570375B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2828473A (en) * | 1956-01-20 | 1958-03-25 | Angus T High | Emergency electrical junction box |
| CN1169271C (en) * | 1997-08-28 | 2004-09-29 | 徐晓鹰 | Three-phase electrical cable plug-type connector |
| CN2687913Y (en) * | 2004-02-20 | 2005-03-23 | 长沙电缆附件有限公司 | T-shape branch joint for power cable branching |
| CN2692900Y (en) * | 2004-03-16 | 2005-04-13 | 段毅文 | High-voltage cable crosslink assembled branch connector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN202424099U (en) | 2012-09-05 |
| CN102570375A (en) | 2012-07-11 |
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Granted publication date: 20141210 Termination date: 20170116 |