CN108376960B - High-voltage common-phase bus duct with high short-circuit resistance - Google Patents
High-voltage common-phase bus duct with high short-circuit resistance Download PDFInfo
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- CN108376960B CN108376960B CN201810314293.9A CN201810314293A CN108376960B CN 108376960 B CN108376960 B CN 108376960B CN 201810314293 A CN201810314293 A CN 201810314293A CN 108376960 B CN108376960 B CN 108376960B
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- bus duct
- porcelain
- movable rod
- phase bus
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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
- H02G5/00—Installations of bus-bars
- H02G5/06—Totally-enclosed installations, e.g. in metal casings
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- Installation Of Bus-Bars (AREA)
Abstract
The invention discloses a high-voltage common-phase bus duct with high short-circuit resistance, and relates to the technical field of distribution equipment. According to the invention, an operator does not need to operate in the shell during installation and disassembly, the connecting strip, the connecting fitting and the supporting porcelain insulator can be integrally installed and disassembled, and the fixing piece is operated only outside the shell, so that the installation, the overhaul and the maintenance of the common-phase bus duct are greatly facilitated for the operator, and the mounting and the overhaul and the maintenance of the common-phase bus duct have the advantages of being capable of quickly installing and disassembling parts therein and improving the working efficiency of the installation, the overhaul and the maintenance of the operator.
Description
Technical Field
The invention relates to the technical field of distribution equipment, in particular to a high-voltage common-phase bus duct with high short-circuit resistance.
Background
In modern high-rise buildings and large-scale workshops, the transmitted electric energy is large, and reliable conduction equipment is selected to be installed in the face of the large current which meets the requirement of hundreds of thousands of amperes, so that the closed busway system is selected as a power distribution device for efficiently transmitting current to adapt to the wiring requirements of higher and higher buildings and large-scale factories.
The enclosed bus is a bus system which is composed of a metal plate (steel plate or aluminum plate) as a protective shell, a conductive bar, an insulating material and related accessories. The lead wire comprises an isolated phase enclosed bus, a common box (containing a common phase isolated phase) enclosed bus and a cable bus, and is widely applied to lead wires of power plants, substations, industrial and civil power supplies.
The common-box enclosed bus comprises a non-isolated-phase common-box enclosed bus, an isolated-phase common-box enclosed bus and an AC/DC excitation common-box bus, and is widely applied to current transmission between a generator outgoing line below 100MW and a low-voltage side of a main transformer or between a low-voltage side of a transformer for a unit plant of 75MW or above and a high-voltage distribution device. The common-box enclosed bus can also be used for a generator AC/DC excitation loop, a substation power lead-in bus or a power lead of other industrial and civil facilities.
The common-box enclosed bus conductor adopts a copper-aluminum bus bar or a groove aluminum groove copper structure, is compact in structure, convenient to install, small in operation and maintenance workload, has the protection grade of IP54, and can basically eliminate the grounding fault caused by external moisture and dust and foreign objects. The shell is made of aluminum plates, so that the corrosion resistance is good, and the additional eddy current loss caused by the steel shell is avoided; the shell is electrically communicated and grounded at multiple points, the danger of electric shock of a human body is avoided, and the requirement on civil engineering is simplified without arranging a net fence. A heat-shrinkable sleeve can be sleeved on the busbar according to the needs of users, and a heater, a respirator and the like are arranged in the box body to strengthen the insulation.
At present, chinese patent with publication number CN103515896A discloses a high-voltage common-box bus, which includes a casing and a plurality of conductive bars, wherein the cross section of the casing is rectangular, the conductive bars are mutually arranged in the casing in parallel in an equidistant manner, a plurality of insulation interval supporting devices are arranged in the casing in the length direction, and the conductive bars are connected in the casing through the insulation interval supporting devices;
the insulation interval supporting device comprises an insulator, a supporting bar, a transverse sliding block and a longitudinal clamping block; the bottom surface of the insulator is fixedly connected to the inner wall of the bottom plate of the shell; the top surface of the supporting bar is provided with a groove for accommodating the conducting bar, and the side surface of the groove is provided with a mortise groove; the bottom surfaces of the supporting bars are fixedly connected to the top surface of the insulator.
Although this kind of high pressure is case bus bar altogether has product light in weight, advantage with low costs for current case bus duct altogether, because its casing is closed completely, the insulator snap-on is in the recess of supporting shoe, in order to guarantee overall structure's fastness, the insulator is very firm with the supporting shoe connection, under the influence of close shell, operating personnel is difficult to installing, dismantling parts such as the insulator of bridge weight and conductive row, the installation and the maintenance of having influenced operating personnel to case bus duct altogether to a great extent, operating personnel's work efficiency has been reduced.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides the high-voltage common-phase bus duct with high short-circuit resistance, which has the advantages of quickly mounting and dismounting parts in the bus duct and improving the working efficiency of mounting, overhauling and maintaining of operators.
In order to solve the technical problems, the invention provides a high-voltage common-phase bus duct with high short-circuit resistance, which comprises a box-shaped shell, wherein openings are formed in two ends of the shell, a plurality of supporting porcelain bottles and connecting hardware fittings connected to the top ends of the supporting porcelain bottles are fixed in the shell, and a connecting piece for connecting the supporting porcelain bottles and a fixing piece for installing and fixing the supporting porcelain bottles are also arranged in the shell;
the connecting piece comprises connecting blocks arranged in a cuboid shape, the connecting blocks are parallel to the opening of the shell and are integrally arranged on the bottom surface of the shell, and one side of the connecting blocks, which faces the top surface of the shell, is provided with a strip-shaped connecting groove; the support porcelain insulator is characterized by also comprising a connecting strip which is arranged in a long strip shape and is matched with the connecting groove, a plurality of support porcelain insulators are mutually parallel and are fixedly connected on the connecting strip, and the connecting strip is embedded in the connecting groove during installation;
the fixing piece comprises a fixing plate which is perpendicular to the connecting block and is positioned on one side of the connecting block, a plurality of fixing plates and the supporting porcelain bottles are arranged in a staggered mode, and the fixing plates are abutted to the connecting strips after installation; still include the movable rod that is on a parallel with the connecting block, the movable rod both ends pierce through the casing lateral wall and sliding connection is on the casing lateral wall, and the equal vertical fixation of a plurality of fixed plates is on the movable rod, and the sliding tray that is the right angle corner setting is seted up to the position that lies in the movable rod on the casing lateral wall.
The technical effects are as follows: when the connecting device is installed, the supporting porcelain bottle is fixed on the connecting strip, the connecting hardware fitting is fixed at the top end of the supporting porcelain bottle, and the connecting strip is located in the connecting groove in the connecting block and is fixed through the fixing piece. When an operator needs to disassemble and overhaul the movable rod, the fixed piece can be opened, namely the movable rod is pulled to slide in the sliding groove; the movable rod drives the fixed plate to move, so that the fixed plate is far away from the connecting strip, and at the moment, an operator can take out the connecting strip from the connecting groove together with the supporting porcelain bottle and the connecting hardware fitting, and takes out the connecting strip from the openings on two sides of the shell for maintenance. So operating personnel need not operate in the casing when installation and dismantlement, can install and dismantle connecting strip, link fitting and support vase an organic whole to only need go on outside the casing to the operation of mounting, made things convenient for operating personnel to the installation and the maintenance of sharing the bus duct to very big degree, promoted operating personnel's work efficiency greatly.
The technical scheme of the invention is further defined as follows:
furthermore, a support porcelain bottle is fixed on the connecting strip through a bolt, and an isolation pad made of rubber materials is arranged between the support porcelain bottle and the connecting strip.
The high-voltage common-phase bus duct with the high short-circuit resistance comprises a plurality of porcelain blocks connected end to end, the porcelain blocks are arranged in an inverted round table shape, the porcelain blocks are connected through threads, and a connecting hardware fitting is fixed on the porcelain blocks on the top end of the porcelain bottles.
The high-voltage common-phase bus duct with high short-circuit resistance is characterized in that a convex circle is arranged at the position where the connecting strip is abutted to the fixing plate, and a holding groove matched with the convex circle is formed in the fixing plate.
The cross section of the movable rod is square, and the width of the sliding groove is the same as the side length of the cross section of the movable rod and is used for supporting the sliding of the movable rod in the sliding groove.
The high-voltage common-phase bus duct with high short-circuit resistance is characterized in that a plurality of movable rods are arranged corresponding to the connecting strips, and one ends of the plurality of movable rods, which are positioned outside the shell, are fixed through the linkage rods.
According to the high-voltage common-phase bus duct with the high short-circuit resistance, the side wall of the connecting block is provided with the drainage holes which are obliquely arranged, the drainage holes are communicated into the connecting grooves, and the bottom surface of the shell is provided with the plurality of drainage outlets.
The high-voltage common-phase bus duct with high short-circuit resistance has the advantages that the top of the casing is provided with the observation window, the observation window is hinged with the sealing plate, and the side face of the casing is provided with the plurality of access holes corresponding to the connecting block.
The high-voltage common-phase bus duct with high short-circuit resistance has the advantages that the pressing blocks are arranged on the top surface of the shell and positioned on the two sides of the sealing plate, the pressing blocks are connected with the pressing plates, and the pressing plates penetrate through the sealing plate and are fixed with the pressing blocks.
Preceding a high anti short circuit performance high pressure is bus duct altogether, the sliding tray is the right angle corner setting, including the horizontal segment that is on a parallel with the horizontal plane and the vertical section of perpendicular to horizontal plane, the length of vertical section is less than the length of horizontal segment, when the movable rod is located the vertical section bottom, fixed plate and connecting strip butt.
The invention has the beneficial effects that:
(1) in the invention, the bus needs to be connected on the connecting hardware fitting, and in order to improve the service life and short-circuit resistance of the shell, the shell is generally made of aluminum, so that a non-conductive support porcelain bottle is needed to connect the shell and the connecting hardware fitting; the arrangement of the isolation pad can further improve the safety and ensure the connection firmness of the support porcelain insulator on the connecting strip;
(2) the support porcelain bottle is formed by connecting a plurality of porcelain blocks end to end, when one connecting hardware fitting is damaged, the porcelain blocks at corresponding positions can be directly detached and replaced, so that the overhaul and replacement of operators are further facilitated, and the production cost of the support porcelain bottle can be reduced. The porcelain block is arranged in an inverted round table shape, so that when condensed water is generated on the supporting porcelain bottle or the supporting porcelain bottle is affected by damp, the water can directly drip from the surface of the supporting porcelain bottle, and the influence of water collection on the connecting hardware fitting and the bus is avoided, so that the connecting hardware fitting and the bus are prevented from being damaged;
(3) after the installation is finished, the fixing plate is abutted against the connecting strip, the connecting strip is provided with the convex circle and is matched with the accommodating groove in the fixing plate, and the connecting strip can be positioned more firmly, so that the connecting strip is prevented from falling from the accommodating groove, and the stability of the integral connection is improved;
(4) according to the invention, the cross section of the movable rod is square, and the movable rod can slide in the sliding groove, so that the square cross section can prevent the movable rod from rotating in the sliding process, and the stability of the movable rod and the fixed plate in the sliding process is improved;
(5) according to the invention, an operator moves one movable rod, and can drive a plurality of movable rods to move together through the linkage rod, so that the operator can conveniently operate the movable rods, and the working efficiency of the operator is further improved;
(6) in the invention, because the common-phase bus duct is arranged in the circuit, the common-phase bus duct is difficult to avoid the situation of being affected with damp or water inflow in the use process, the side wall of the connecting block is provided with the drain hole communicated to the connecting groove, accumulated water in the connecting groove can be drained out, and the accumulated water is drained out of the shell from the drain hole on the bottom surface of the shell, so that the occurrence of the accumulated water situation is avoided;
(7) the observation window can be convenient for an operator to determine the problem during maintenance and convenient for the operator to disassemble and assemble, and the observation window can be sealed by the sealing plate; meanwhile, the access hole can be matched with an operator to conveniently determine the position of the problem, improve the maintenance efficiency and reduce the maintenance difficulty.
Drawings
FIG. 1 is a schematic structural diagram of the present embodiment;
FIG. 2 is a front view of the present embodiment;
FIG. 3 is a schematic view illustrating a convex circle in the present embodiment;
wherein: 1. a housing; 11. supporting the porcelain insulator; 111. a porcelain block; 12. connecting a hardware fitting; 13. an insulating pad; 14. a water outlet; 15. an observation window; 16. a closing plate; 161. pressing a plate; 162. briquetting; 17. an access hole; 18. aluminum feet; 2. a connecting member; 21. connecting blocks; 22. connecting grooves; 23. a connecting strip; 24. convex round; 25. a drain hole; 3. a fixing member; 31. a fixing plate; 32. a movable rod; 33. a sliding groove; 331. a horizontal segment; 332. a vertical section; 34. accommodating grooves; 35. a linkage rod.
Detailed Description
The high-voltage common-phase bus duct with high short-circuit resistance provided by the embodiment is structurally shown in fig. 1-3. The novel shell comprises a shell body 1, wherein the shell body 1 is integrally arranged in a square box shape, and the front and the rear of the shell body 1 are open and communicated with each other. An observation window 15 is formed in the top surface of the shell 1, a closing plate 16 is hinged to one side of the observation window 15, and after the installation is completed, the closing plate 16 can close the observation window 15. As shown in fig. 2, pressing blocks 162 are disposed on two sides of the closing plate 16 on the top surface of the housing 1, a pressing plate 161 is connected to the pressing blocks 162, and the pressing plate 161 penetrates through the closing plate 16 and is fixed to the pressing blocks 162, so that the sealing performance of the closing plate 16 can be improved.
A plurality of rows of support porcelain bottles 11 are fixed on the bottom surface of the shell 1, and the three support porcelain bottles 11 are arranged in a row and are arranged in parallel. The top of each row of corresponding support porcelain bottles 11 is fixed with the same connecting hardware fitting 12, and the connecting hardware fitting 12 is connected with the bus. The support porcelain bottle 11 is connected to the housing 1 through the connecting piece 2 and is fixed through the fixing piece 3.
A plurality of access holes 17 are formed in two side faces of the adjacent opening of the shell 1, the access holes 17 are arranged corresponding to the positions of the support porcelain bottles 11, and a plurality of water outlets 14 communicated with the outside are formed in the bottom face of the shell 1 and used for discharging accumulated water in the common-phase bus duct. The corner positions of the top surface and the bottom surface of the shell 1 are also fixed with foot aluminum 18, so that the stability of the shell 1 can be improved on one hand, and the service life and the short-circuit resistance of the shell 1 can be improved on the other hand.
The connecting piece 2 comprises a plurality of connecting blocks 21 which are parallel to the opening of the shell 1, the whole connecting block 21 is in a cuboid shape, each connecting block 21 is arranged below the corresponding supporting porcelain bottle 11, and the connecting blocks are integrally arranged on the bottom surface of the shell 1. The connecting block 21 has a connecting groove 22 on the top surface thereof, and the connecting groove 22 is in a strip shape.
The connecting piece 2 further comprises an elongated connecting strip 23, and the connecting strip 23 is matched with the connecting strip 23. Each connecting strip 23 is fixed with three parallel supporting porcelain bottles 11, the supporting porcelain bottles 11 are fixed on the connecting strips 23 through bolts, an isolation pad 13 is arranged between each connecting strip 23 and each supporting porcelain bottle 11, and each isolation pad 13 is made of rubber materials. The support porcelain bottle 11 is formed by connecting a plurality of porcelain blocks 111, the porcelain blocks 111 are arranged in an inverted circular truncated cone shape, the porcelain blocks 111 are connected with each other in pairs through threads, and the connecting hardware fitting 12 is fixed on the porcelain block 111 at the topmost end of the support porcelain bottle 11.
The fixing member 3 includes a plurality of fixing plates 31, and after the installation, the fixing plates 31 are abutted to the top surfaces of the connecting bars 23. Connecting strip 23 is located and is equipped with a plurality of bulge 24 between the support vase 11, and bulge 24 corresponds fixed plate 31 and is provided with a plurality of, is equipped with curved holding tank 34 on the fixed plate 31, holding tank 34 and bulge 24 adaptation. The fixed member 3 further includes a movable bar 32, the connecting bar 23 is fixed on the movable bar 32, the movable bar 32 is disposed parallel to the connecting bar 23, and both ends thereof penetrate the side surface of the housing 1 and are slidably connected to the housing 1.
The cross section of the movable rod 32 is square, a sliding groove 33 is arranged on the shell 1, the movable rod 32 is positioned in the sliding groove 33, the side length of the cross section of the movable rod 32 is the same as that of the sliding groove 33, and the movable rod 32 can slide in the sliding groove 33. The sliding groove 33 is disposed at a right angle and includes a horizontal section 331 parallel to the horizontal plane and a vertical section 332 perpendicular to the horizontal plane, the vertical section 332 has a length smaller than that of the horizontal section 331, and when the movable rod 32 is located at the bottom of the vertical section 332, the fixed plate 31 abuts against the connecting bar 23.
The shell 1 is also provided with a linkage rod 35 which is perpendicular to the movable rod 32, the movable rod 32 is provided with a plurality of parallel movable rods 32, and the movable rods 32 are all fixed with the linkage rod 35. When the operator pulls one of the movable levers 32 to slide, all the movable levers 32 can be driven to slide by the linkage lever 35. The connecting block 21 is provided with a drain hole 25, the drain hole 25 is communicated with the connecting groove 22, and the drain hole 25 is integrally and obliquely arranged and used for draining accumulated water in the connecting groove and draining the accumulated water to the outside through the drain opening 14.
When an operator needs to disassemble and overhaul the device, the fixed part 3 can be opened, namely the movable rod 32 is pulled, so that the movable rod 32 slides in the sliding groove 33; the movable rod 32 drives the fixed plate 31 to move, so that the fixed plate 31 is far away from the connecting bar 23, and at this time, the operator can take the connecting bar 23 with the support vase 11 and the connection fitting 12 out of the connecting groove 22, and take out the connecting bar and the connection fitting 12 from the openings on the two sides of the housing 1 for maintenance.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (8)
1. The utility model provides a high anti short circuit performance high pressure is bus duct altogether, includes boxlike casing (1), casing (1) both ends opening sets up, casing (1) internal fixation has a plurality of support vase (11) and connects support link fitting (12) on vase (11) top, its characterized in that: the shell (1) is also internally provided with a connecting piece (2) for connecting and supporting the porcelain bottle (11) and a fixing piece (3) for installing and fixing the supporting porcelain bottle (11);
the connecting piece (2) comprises connecting blocks (21) which are arranged in a cuboid shape, the connecting blocks (21) are parallel to the opening of the shell (1), a plurality of connecting blocks are integrally arranged on the bottom surface of the shell (1), and one side of each connecting block (21) facing the top surface of the shell (1) is provided with a strip-shaped connecting groove (22); the support porcelain insulator is characterized by further comprising a connecting strip (23) which is arranged in a long strip shape and matched with the connecting groove (22), wherein a plurality of support porcelain insulators (11) are parallel to each other and fixedly connected to the connecting strip (23), and the connecting strip (23) is embedded in the connecting groove (22) during installation;
the fixing piece (3) comprises a fixing plate (31) which is perpendicular to the connecting block (21) and is positioned on one side of the connecting block (21), a plurality of fixing plates (31) and the supporting porcelain bottles (11) are arranged in a staggered mode, and the fixing plates (31) are abutted to the connecting strips (23) after installation is completed; the connecting block is characterized by further comprising a movable rod (32) parallel to the connecting block (21), two ends of the movable rod (32) penetrate through the side wall of the shell (1) and are connected to the side wall of the shell (1) in a sliding mode, a plurality of fixing plates (31) are vertically fixed on the movable rod (32), and a sliding groove (33) arranged in a right-angle corner mode is formed in the position, located on the movable rod (32), of the side wall of the shell (1);
the support porcelain bottle (11) is fixed on the connecting strip (23) through a bolt, and an isolation pad (13) made of rubber materials is arranged between the support porcelain bottle (11) and the connecting strip (23); support vase (11) including a plurality of end to end's porcelain piece (111), porcelain piece (111) are the round platform form setting of invering, through threaded connection between porcelain piece (111), link fitting (12) are fixed support vase (11) top on porcelain piece (111).
2. The high-voltage common-phase bus duct with high short-circuit resistance performance as claimed in claim 1, wherein: the connecting strip (23) with the position of fixed plate (31) butt is equipped with protruding circle (24), be equipped with on fixed plate (31) with holding tank (34) of protruding circle (24) adaptation.
3. The high-voltage common-phase bus duct with high short-circuit resistance performance as claimed in claim 2, wherein: the cross section of the movable rod (32) is square, the width of the sliding groove (33) is the same as the side length of the cross section of the movable rod (32), and the sliding groove is used for supporting the sliding of the movable rod (32) in the sliding groove (33).
4. The high-voltage common-phase bus duct with high short-circuit resistance as set forth in claim 3, wherein: the movable rods (32) are provided with a plurality of rods corresponding to the connecting strips (23), and the movable rods (32) are fixed through linkage rods (35) located at one end outside the shell (1).
5. The high-voltage common-phase bus duct with high short-circuit resistance performance as claimed in claim 1, wherein: the side wall of the connecting block (21) is provided with a drain hole (25) which is obliquely arranged, the drain hole (25) is communicated to the connecting groove (22), and the bottom surface of the shell (1) is provided with a plurality of water outlets (14).
6. The high-voltage common-phase bus duct with high short-circuit resistance performance as claimed in claim 5, wherein: observation window (15) have been seted up at casing (1) top, it has closing plate (16) to articulate on observation window (15), correspond on casing (1) side connecting block (21) position has seted up a plurality of access hole (17).
7. The high-voltage common-phase bus duct with high short-circuit resistance performance as claimed in claim 6, wherein: the top surface of the shell (1) is located on two sides of the closing plate (16) and is provided with a pressing block (162), a pressing plate (161) is connected to the pressing block (162), and the pressing plate (161) penetrates through the closing plate (16) and is fixed to the pressing block (162).
8. The high-voltage common-phase bus duct with high short-circuit resistance as claimed in claim 7, wherein: the sliding groove (33) is arranged in a right-angle corner mode and comprises a horizontal section (331) parallel to the horizontal plane and a vertical section (332) perpendicular to the horizontal plane, the length of the vertical section (332) is smaller than that of the horizontal section (331), and when the movable rod (32) is located at the bottom of the vertical section (332), the fixed plate (31) is abutted to the connecting strip (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810314293.9A CN108376960B (en) | 2018-04-10 | 2018-04-10 | High-voltage common-phase bus duct with high short-circuit resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810314293.9A CN108376960B (en) | 2018-04-10 | 2018-04-10 | High-voltage common-phase bus duct with high short-circuit resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108376960A CN108376960A (en) | 2018-08-07 |
| CN108376960B true CN108376960B (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810314293.9A Active CN108376960B (en) | 2018-04-10 | 2018-04-10 | High-voltage common-phase bus duct with high short-circuit resistance |
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| CN (1) | CN108376960B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212479B (en) * | 2019-06-13 | 2020-12-18 | 华翔翔能科技股份有限公司 | Bus duct with folding function |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29800869U1 (en) * | 1998-01-20 | 1998-04-23 | NVB Nachtrodt & vom Brocke GmbH & Co., 58579 Schalksmühle | Junction box with electrical devices |
| CN103515896A (en) * | 2012-06-20 | 2014-01-15 | 扬州蓝海电气有限公司 | High-voltage common-box bus |
| CN204271583U (en) * | 2014-11-19 | 2015-04-15 | 江苏博尔特电力科技有限公司 | GM is case enclosed busbar groove altogether |
| CN207082803U (en) * | 2017-08-10 | 2018-03-09 | 洪灵坪 | A kind of special assistance platform of overhead type bus ceramic insulator |
| CN107749569B (en) * | 2017-09-28 | 2024-05-10 | 天源华威集团有限公司 | Switch cabinet convenient for mounting long bus |
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2018
- 2018-04-10 CN CN201810314293.9A patent/CN108376960B/en active Active
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| CN108376960A (en) | 2018-08-07 |
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