35kV 1250A Compact Gas-Inflatable Ring Main Unit

Abstract

This invention provides a 35kV 1250A compact gas-insulated ring main unit, belonging to the field of ring main units. It includes a gas box, a support frame installed inside the gas box, a disconnector operating mechanism, a circuit breaker operating mechanism, a drive shaft mounted on the support frame via a bearing seat, a three-position rotating main shaft mounted on the support frame via a bearing seat, three-phase identical solid-sealed poles located inside the gas box, and three-phase identical three-position disconnectors located inside the gas box. Both the disconnector operating mechanism and the circuit breaker operating mechanism are installed on one side of the gas box. The disconnector operating mechanism is connected to one end of the three-position rotating main shaft. The solid-sealed poles are installed on the support frame and connected to the circuit breaker operating mechanism via the drive shaft. The three-position disconnector includes an isolating stationary blade installed on one side of the solid-sealed pole, a grounding stationary blade installed on the support frame, and a moving blade installed on the three-position rotating main shaft. The achieved technical effect is that the ring main unit has a smaller size and fewer parts.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, and in particular to a 35kV 1250A compact inflatable ring main unit. Background Technology

[0002] With the deepening of the "dual carbon" goals and the upgrading of power system intelligence, 35kV ring main units, as key node equipment in the power transmission and distribution network, undertake important responsibilities such as power distribution, line protection, and fault isolation. Their application scenarios have covered multiple fields such as urban power grid transformation, new energy grid connection, and underground utility tunnel construction. With the continuous growth of electricity load and the diversification of power distribution scenarios, 35kV ring main units need to simultaneously meet three core technical requirements: high current carrying capacity, compact space adaptation, and compatibility with existing equipment. Among them, the market demand for 1250A rated current level products continues to rise due to their suitability for medium and high voltage high load power distribution scenarios.

[0003] However, most existing 35kV 1250A ring main units are modified from 630A ring main units by increasing the cross-sectional area of ​​the primary conductive components. For example, they are modified from 630A ring main units with a clamp-type switch as the core or a 630A ring main unit with a semi-solid-sealed switch as the core. The modified 35kV 1250A ring main units generally have defects such as redundant air chamber structure, large size, many parts and complex assembly, which make them difficult to adapt to space-constrained scenarios such as underground pipe corridors. Summary of the Invention

[0004] This invention provides a 35kV 1250A compact gas-insulated ring main unit to solve the defects of existing 35kV 1250A ring main units, such as redundant air chamber structure, large size, many parts and complex assembly, and to achieve a 35kV 1250A compact gas-insulated ring main unit structure with smaller size and effectively reduced parts.

[0005] This invention provides a 35kV 1250A compact gas-insulated ring main unit, including a gas box, a support frame, a disconnector operating mechanism, a circuit breaker operating mechanism, a drive shaft, a three-position rotating main shaft, three-phase fixed poles with the same structure located in the gas box, and three-phase disconnectors with the same structure located in the gas box. The support frame is installed inside the gas box; the disconnector operating mechanism and the circuit breaker operating mechanism are both installed on one side of the gas box; the drive shaft is installed on the support frame through a shaft seat, the three-position rotary shaft is installed on the support frame through a shaft seat, and the disconnector operating mechanism is connected to one end of the three-position rotary shaft; The solid-sealed pole is mounted on the support frame and is connected to the circuit breaker operating mechanism via a drive shaft; the three-position disconnect switch includes a stationary disconnecting knife, a stationary grounding knife, and a moving knife. The stationary disconnecting knife is mounted on one side of the solid-sealed pole, the stationary grounding knife is mounted on the support frame, and the moving knife is mounted on the three-position rotating shaft. When the circuit breaker is open, the moving blade is positioned between the grounding stationary blade and the isolating stationary blade. When the circuit breaker is grounded, the moving blade engages with the grounding stationary blade. When the circuit breaker is closed, the moving blade engages with the isolating stationary blade.

[0006] In addition, the 35kV 1250A compact gas-insulated ring main unit according to the present invention may also have the following additional technical features: In some embodiments of the present invention, the three-station rotating shaft includes a first rotating shaft, a first three-station rotating shaft, a second three-station rotating shaft, a third three-station rotating shaft, and a second rotating shaft connected sequentially from head to tail; The first rotating shaft is mounted on one end of the support frame via a shaft seat, and the second rotating shaft is mounted on the other end of the support frame via a shaft seat. The moving blades of the three-phase three-position disconnector are respectively installed on the first three-position rotating shaft, the second three-position rotating shaft, and the third three-position rotating shaft; The operating mechanism of the disconnect switch is connected to the first rotating shaft.

[0007] In some embodiments of the present invention, the first three-station rotating shaft includes a first left plug-in shaft, a first crank arm, and a first right plug-in shaft that are fixedly connected from left to right. The second and third station rotating shafts include a second left insertion shaft, a second crank arm, and a second right insertion shaft that are fixedly connected from left to right. The third three-position rotating shaft includes a third left plug-in shaft, a third crank arm, and a third right plug-in shaft that are fixedly connected from left to right; The first left insertion shaft is fixedly connected to the first rotating shaft, the first right insertion shaft is fixedly connected to the second left insertion shaft, the second right insertion shaft is fixedly connected to the third left insertion shaft, and the third right insertion shaft is fixedly connected to the second rotating shaft. The moving blades of the three-phase three-position disconnect switch are respectively installed on the first crank arm, the second crank arm, and the third crank arm.

[0008] In some embodiments of the present invention, the first three-station rotating shaft further includes a first reinforcing rib, and the first left insertion shaft and the first crank arm are both fixedly connected to the first reinforcing rib and the first right insertion shaft and the first crank arm. The second and third station rotating shafts also include a second reinforcing rib. The second reinforcing ribs are fixedly connected between the second left insertion shaft and the second crank arm, and between the second right insertion shaft and the second crank arm. The third station rotating shaft also includes a third reinforcing rib. The third left insertion shaft and the third crank arm are both fixedly connected with the third reinforcing rib, as are the third right insertion shaft and the third crank arm.

[0009] In some embodiments of the present invention, the three-station rotating shaft further includes a first connecting end cover and a second connecting end cover, the first left insertion shaft is connected to the first rotating shaft through the first connecting end cover, and the third right insertion shaft is connected to the second rotating shaft through the second connecting end cover.

[0010] In some embodiments of the present invention, the solid-sealed pole includes an insulating cylinder, an arc-extinguishing chamber, an insulating tie rod, and a flexible connection; The insulating cylinder is installed on the support frame, the arc-extinguishing chamber is installed inside the insulating cylinder, the upper end of the insulating rod is connected to the moving contact of the arc-extinguishing chamber, the lower end of the insulating rod is connected to the circuit breaker operating mechanism through the drive shaft, one end of the flexible connection is connected to the isolating stationary contact, and the other end of the flexible connection is connected to the moving contact of the arc-extinguishing chamber.

[0011] In some embodiments of the present invention, the solid-sealed pole also includes a crank arm connecting block and a crank arm. The crank arm connecting block is installed at the lower end of the insulating pull rod, one end of the crank arm is fixedly installed on the drive shaft, and the other end of the crank arm is connected to the crank arm connecting block through a pin.

[0012] In some embodiments of the present invention, the three-position disconnect switch further includes a moving knife holder, a supporting insulator, and a grounding bracket; The moving tool holder is connected to the support frame via a supporting insulator. The three-position rotating shaft and the moving tool are connected to the moving tool holder via the same rotating shaft. The grounding bracket is installed on the support frame, and the grounding stationary knife is installed on the grounding bracket.

[0013] In some embodiments of the present invention, the three-position disconnect switch further includes a grounding buffer pad, an isolation buffer pad, and a pad plate; The grounding buffer pad is set on the grounding stationary knife, the isolation buffer pad is set on the isolation stationary knife, and the pad plate is set between the supporting insulator and the support frame.

[0014] In some embodiments of the present invention, the moving knife includes two moving blades, a connecting pin, two compression springs, and two abutment blocks; Both moving blades are connected to the moving blade holder via a rotating shaft. The two moving blades are connected to each other via a connecting pin. One moving blade is connected to one abutting block via a compression spring, and the other moving blade is connected to another abutting block via another compression spring. Both abutting blocks are fixedly connected to the three-position rotating main shaft. Each moving blade includes an integrally formed blade body, a protrusion, and an arc-shaped portion. The protrusion is located at one end of the blade body and is used to contact the isolation stationary blade or the grounding stationary blade. The arc-shaped portion is located on one side of the blade body, and the thickness of the protrusion is greater than the thickness of the blade body.

[0015] In summary, this application includes the following beneficial technical effects: By installing the three-phase solid-sealed poles and the three-phase three-position disconnecting switch on the support frame, and integrating the three-phase solid-sealed poles, the three-phase three-position disconnecting switch, and the support frame into the gas box, a single-chamber integrated ring main unit structure is formed. Compared with multi-chamber structures, this reduces the number of insulating partitions and connecting busbars, thereby reducing the volume of the ring main unit and significantly reducing the number of components. This effectively reduces production errors and the risk of later failures, improves reliability, reduces the impact of external dust, moisture, and corrosive gases, reduces the number of maintenance operations, increases the maintenance-free period, and is suitable for space-constrained scenarios such as underground pipe corridors. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A perspective view of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention is shown schematically.

[0017] Figure 2 A perspective view of the structure of the gas box of a 35kV 1250A compact inflatable ring main unit with the gas box removed is schematically shown according to some embodiments of the present invention.

[0018] Figure 3 A perspective view of a 35kV 1250A compact gas-insulated ring main unit without a gas box is schematically shown according to some embodiments of the present invention.

[0019] Figure 4 A perspective view schematically illustrating the connection between the drive shaft and the three-phase solid-sealed pole of a 35kV 1250A compact gas-insulated ring main unit according to some embodiments of the present invention is shown.

[0020] Figure 5 A schematic top view of a 35kV 1250A compact inflatable ring main unit without an air box, according to some embodiments of the present invention, is shown.

[0021] Figure 6 A schematic front view of a 35kV 1250A compact gas-insulated ring main unit without a gas box is shown according to some embodiments of the present invention.

[0022] Figure 7 The diagram schematically shows a front view of a 35kV 1250A compact gas-insulated ring main unit without a gas box according to some embodiments of the present invention.

[0023] Figure 8 A perspective view of the three-position rotating main shaft of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention is shown schematically.

[0024] Figure 9 The diagram schematically shows a first perspective view of the first three-position rotating shaft of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention.

[0025] Figure 10 The second view schematically illustrates a perspective view of the first three-position rotating shaft of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention.

[0026] Figure 11 The first perspective view of the second and third station rotating shafts of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention is shown schematically.

[0027] Figure 12 The second view schematically illustrates a perspective view of the second and third station rotating shafts of a 35kV 1250A compact pneumatic ring main unit according to some embodiments of the present invention.

[0028] Figure 13 The first perspective view of the third three-position rotating shaft of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention is shown schematically.

[0029] Figure 14 The second view schematically illustrates a perspective view of the third three-position rotating shaft of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention.

[0030] Figure 15 A perspective view of the moving blade of a 35kV 1250A compact pneumatic ring main unit according to some embodiments of the present invention is shown schematically.

[0031] Figure 16 A perspective view of the moving blade of a 35kV 1250A compact pneumatic ring main unit according to some embodiments of the present invention is shown schematically.

[0032] Figure 17 The first perspective view schematically illustrates the connection between the support frame and the fixing plate of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention.

[0033] Figure 18 The second perspective view schematically illustrates the connection between the support frame and the fixing plate of a 35kV 1250A compact inflatable ring main unit according to some embodiments of the present invention.

[0034] Figure label: Air box, 11, support frame, 111, intermediate crossbeam, 112, first support plate, 113, second support plate, 114, support rib, 12, fixing plate; Circuit breaker operating mechanism; Disconnector switch operating mechanism; 4. Drive shaft; 41. Shaft body; 5. Three-station rotating shaft; 51. First rotating shaft; 52. First three-station rotating shaft; 521. First left insertion shaft; 522. First crank arm; 523. First right insertion shaft; 524. First reinforcing rib; 53. Second three-station rotating shaft; 531. Second left insertion shaft; 532. Second crank arm; 533. Second right insertion shaft; 534. Second reinforcing rib; 54. Third three-station rotating shaft; 541. Third left insertion shaft; 542. Third crank arm; 543. Third right insertion shaft; 544. Third reinforcing rib; 55. Second rotating shaft; 56. First connecting end cover; 57. Second connecting end cover; 6. Solid-sealed pole; 61. Insulating cylinder; 611. Arc-extinguishing chamber; 612. Insulating pull rod; 613. Flexible connection; 614. Heat dissipation hole; 62. First fixing nut; 63. Second fixing nut; 64. Crank arm; 65. Prototype conductive block; 66. Crank arm connecting block. 7. Three-position disconnect switch; 71. Isolating stationary blade; 711. Isolating buffer pad; 72. Grounding stationary blade; 721. Grounding bracket; 722. Grounding buffer pad; 723. Grounding busbar; 73. Moving blade; 731. Moving blade holder; 732. Support insulator; 7321. Umbrella skirt structure; 733. Pad; 734. Moving blade; 7341. Blade body; 7342. Protrusion; 7343. Arc; 735. Connecting pin; 736. Compression spring; 737. Abutment block; 8. Transmission box; 81. Partition. Detailed Implementation

[0035] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0036] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” used herein may also refer to the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a specific order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0037] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0038] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may also be rotated 90 degrees or in other orientations, and the spatial relative descriptors used in the text will be interpreted accordingly.

[0039] like Figures 1 to 18As shown, according to an embodiment of the first aspect of the present invention, a 35kV 1250A compact gas-insulated ring main unit is provided, including a gas box 1, a support frame 11, a disconnector operating mechanism 3, a circuit breaker operating mechanism 2, a drive shaft 4, a three-position rotating shaft 5, three-phase fixed-seal poles 6 with identical structures located in the gas box 1, and three-phase three-position disconnectors 7 with identical structures located in the gas box 1. The support frame 11 is installed inside the gas box 1; the disconnector operating mechanism 3 and the circuit breaker operating mechanism 2 are both installed on one side of the gas box 1; the drive shaft 4 is installed on the support frame 11 through a bearing seat, and the three-position rotating shaft 5 is installed on the support frame 11 through a bearing seat. One end of the disconnector operating mechanism 3 is connected to the three-position rotating shaft 5; the three-phase fixed-seal poles 6 and the three-phase three-position disconnectors 7 are arranged in a one-to-one correspondence. The solid-sealed pole 6 is mounted on the support frame 11 and is connected to the circuit breaker operating mechanism 2 via the drive shaft 4; the three-position disconnect switch 7 includes a stationary isolation knife 71, a stationary grounding knife 72 and a moving knife 73. The stationary isolation knife 71 is mounted on one side of the solid-sealed pole 6, the stationary grounding knife 72 is mounted on the support frame 11, and the moving knife 73 is mounted on the three-position rotating shaft 5. When the circuit is open, the moving knife 73 is located between the grounding stationary knife 72 and the isolating stationary knife 71. When grounding, the moving knife 73 engages with the grounding stationary knife 72. When the circuit is closed, the moving knife 73 engages with the isolating stationary knife 71.

[0040] In the above embodiments, it should be noted that three phases means three phases A, B, and C, or one phase for each of A, B, and C, for a total of three; the three-position disconnect switch 7 is located on one side of the solid-sealed pole 6, and the gas box 1 is a 304 stainless steel gas box 1.

[0041] Both the circuit breaker operating mechanism 2 and the disconnector operating mechanism 3 are existing structures, and their specific structures will not be discussed in detail here; the solid-sealed pole 6 is cylindrical in shape, which makes the electric field distribution uniform, satisfies the chimney effect, and is conducive to the heat dissipation of the pole.

[0042] It also includes a fixed plate 12 and a transmission box 8. The support frame 11 includes a middle crossbeam 111, a first support plate 112, a second support plate 113, and support ribs 114. The two ends of the middle crossbeam 111 are respectively bolted to the first support plate 112 and the second support plate 113. Support ribs 114 are welded between the first support plate 112 and the middle crossbeam 111, and between the second support plate 113 and the middle crossbeam 111. A fixed plate 12 is also bolted to the first support plate 112. The fixed plate 12 is installed in the air box 1 by bolting. The second support plate 113 is installed in the air box 8 by bolting. Inside the housing 1, the two ends of the transmission housing 8 are connected to the first support plate 112 and the second support plate 113 respectively by welding or bolting. The transmission housing 8 is spaced apart from the intermediate crossbeam 111. The fixed sealing pole 6 is installed on the transmission housing 8 by bolting. The two ends of the transmission shaft 4 are installed on the first support plate 112 and the second support plate 113 respectively through a bearing seat, and the transmission shaft 4 passes through the transmission housing 8. The three-position rotating main shaft 5 is installed on the first support plate 112 and the second support plate 113 respectively through a bearing seat. The grounding stationary knife 72 is installed on the intermediate crossbeam 111. The transmission shaft 4 is a splined shaft.

[0043] The working principle of the three-position disconnector 7 of this ring main unit is as follows: When closing, the disconnector operating mechanism 3 drives the three-position rotating shaft 5 to rotate, which in turn drives the rotating shaft of the moving blade 73 to the position where it engages with the isolating stationary blade 71, thus completing the closing; when opening, the disconnector operating mechanism 3 drives the three-position rotating shaft 5 to rotate, which in turn drives the rotating shaft of the moving blade 73 to the position between the isolating stationary blade 71 and the isolating moving blade 73, thus completing the opening; when grounding, the disconnector operating mechanism 3 drives the three-position rotating shaft 5 to rotate, which in turn drives the rotating shaft of the moving blade 73 to the position where it engages with the grounding stationary blade 72, thus completing the grounding.

[0044] The technical effects achieved by the above embodiments are as follows: by installing the three-phase solid-sealed pole 6 and the three-phase three-position disconnect switch 7 on the support frame 11 and integrating the three-phase solid-sealed pole 6, the three-phase three-position disconnect switch 7 and the support frame 11 into the gas box 1, a single-gas-chamber integrated ring main unit structure is formed. Compared with multi-gas-chamber structures, the insulation partition 81 and connecting busbars are reduced, the volume of the ring main unit is reduced, and the number of parts of the ring main unit is significantly reduced. This effectively reduces production errors and the risk of later failures, improves reliability, reduces the impact of external dust, moisture and corrosive gases, reduces the number of maintenance times, increases the maintenance-free period, and can be adapted to space-constrained scenarios such as underground pipe corridors. In addition, this ring main unit can be flexibly combined with modules such as incoming line cabinets, outgoing line cabinets, and metering cabinets. It can be expanded to the front, back, left, and right through the parallel cabinet connection plate to meet different power distribution capacity requirements.

[0045] The integration of the three-position disconnect switch 7, the three-position rotating shaft 5, and the three-phase solid-sealed pole 6 onto the support frame 11 results in a higher degree of integration and a smaller overall size. Furthermore, the three-position rotating shaft 5 facilitates convenient switching of the three-phase three-position disconnect switch 7 from the closing position to the opening position and the grounding position, while also minimizing its space requirements.

[0046] Optional, such as Figure 2 , Figure 3 as well as Figures 8 to 14 As shown, the three-position rotating shaft 5 includes a first rotating shaft 51, a first three-position rotating shaft 52, a second three-position rotating shaft 53, a third three-position rotating shaft 54, and a second rotating shaft 55 connected sequentially from head to tail. The first rotating shaft 51 is mounted on one end of the support frame 11 via a shaft seat, and the second rotating shaft 55 is mounted on the other end of the support frame 11 via a shaft seat. The moving blade 73 of the three-phase three-position disconnect switch 7 is respectively mounted on the first three-position rotating shaft 52, the second three-position rotating shaft 53, and the third three-position rotating shaft 54. The disconnect switch operating mechanism 3 is connected to the first rotating shaft 51.

[0047] In the above optional embodiments, it should be noted that the disconnecting switch operating mechanism 3 and the first rotating shaft 51 are connected by a coupling.

[0048] The moving blade 73 of the three-phase three-position disconnector 7 is respectively installed on the first three-position rotating shaft 52, the second three-position rotating shaft 53 and the third three-position rotating shaft 54. This means that the moving blade 73 of the three-phase three-position disconnector 7 is installed on the first three-position rotating shaft 52, the second three-position rotating shaft 53 and the third three-position rotating shaft 54 ​​respectively.

[0049] Optional, such as Figure 2 , Figure 3 as well as Figures 8 to 14 As shown, the first three-position rotating shaft 52 includes a first left plug shaft 521, a first crank arm 522, and a first right plug shaft 523, which are fixedly connected from left to right. The second three-position rotating shaft 53 includes a second left plug shaft 531, a second crank arm 532, and a second right plug shaft 533, which are fixedly connected from left to right. The third three-position rotating shaft 54 ​​includes a third left plug shaft 541, a third crank arm 542, and a third right plug shaft 543, which are fixedly connected from left to right. The first left plug shaft 521 is fixedly connected to the first rotating shaft 51. The first right plug shaft 523 is fixedly connected to the second left plug shaft 531. The second right plug shaft 533 is fixedly connected to the third left plug shaft 541. The third right plug shaft 543 is fixedly connected to the second rotating shaft 55. The moving blade 73 of the three-phase three-position disconnecting switch 7 is respectively installed on the first crank arm 522, the second crank arm 532, and the third crank arm 542.

[0050] In the above optional embodiments, it should be noted that the first left insertion shaft 521, the first crank arm 522 and the first right insertion shaft 523 are integrally formed, the second left insertion shaft 531, the second crank arm 532 and the second right insertion shaft 533 are integrally formed, and the third left insertion shaft 541, the third crank arm 542 and the third right insertion shaft 543 are integrally formed.

[0051] The first right plug-in shaft 523 and the second left plug-in shaft 531 are plugged in and then fixedly connected by bolts. The second right plug-in shaft 533 and the third left plug-in shaft 541 are plugged in and then fixedly connected by bolts. The third right plug-in shaft 543 and the second rotating shaft 55 are plugged in and then fixedly connected by bolts. The moving blade 73 of the three-phase three-position disconnect switch 7 is respectively installed on the first crank arm 522, the second crank arm 532 and the third crank arm 542. This means that the moving blade 73 of the three-phase three-position disconnect switch 7 is installed on the first crank arm 522, the second crank arm 532 and the third crank arm 542 respectively.

[0052] The advantages of the above optional embodiments are as follows: the arrangement of the first three-position rotating shaft 52, the second three-position rotating shaft 53 and the third three-position rotating shaft 54 ​​makes the three-position rotation assembly form a modular structure, which increases the convenience of the installation of this ring main unit; the arrangement of the first crank arm 522, the second crank arm 532 and the third crank arm 542 increases the stability of the connection between the moving knife 73 of the three-position disconnect switch 7 and the three-position rotating main shaft 5, thereby improving the reliability of the moving knife 73.

[0053] Optional, such as Figure 2 , Figure 3 as well as Figures 8 to 14 As shown, the first three-station rotating shaft 52 also includes a first reinforcing rib 524, which is fixedly connected between the first left insertion shaft 521 and the first crank arm 522, and between the first right insertion shaft 523 and the first crank arm 522; the second three-station rotating shaft 53 also includes a second reinforcing rib 534, which is fixedly connected between the second left insertion shaft 531 and the second crank arm 532, and between the second right insertion shaft 533 and the second crank arm 532; the third three-station rotating shaft 54 ​​also includes a third reinforcing rib 544, which is fixedly connected between the third left insertion shaft 541 and the third crank arm 542, and between the third right insertion shaft 543 and the third crank arm 542.

[0054] In the above optional embodiments, it should be noted that the fixed connection can be made by welding or by bolting.

[0055] The beneficial effects of the above optional embodiments are as follows: the arrangement of the first reinforcing rib 524, the second reinforcing rib 534 and the third reinforcing rib 544 ensures the stability and reliability of the first three-station rotating shaft 52, the second three-station rotating shaft 53 and the first three-station rotating shaft 52.

[0056] Optional, such as Figure 2 and Figure 3 As shown, the three-station rotating shaft 5 also includes a first connecting end cover 56 and a second connecting end cover 57. The first left insertion shaft 521 is connected to the first rotating shaft 51 through the first connecting end cover 56, and the third right insertion shaft 543 is connected to the second rotating shaft 55 through the second connecting end cover 57.

[0057] In the above optional embodiments, it should be noted that the first rotating shaft 51 is inserted into the first connecting end cover 56 and then fixed with bolts; the second rotating shaft 55 is inserted into the second connecting end cover 57 and then fixed with bolts; the first left inserting shaft 521 is inserted into the first connecting end cover 56 and then fixed with bolts; and the third right inserting shaft 543 is inserted into the second connecting end cover 57 and then fixed with bolts.

[0058] The advantages of the above optional embodiments are that the transition setting of the first connecting end cover 56 and the second connecting end cover 57 further increases the rotational stability and reliability of the three-station rotating shaft 5.

[0059] Optional, such as Figures 1 to 7 As shown, the solid-sealed pole 6 includes an insulating cylinder 61, an arc-extinguishing chamber 611, an insulating pull rod 612, and a flexible connection 613. The insulating cylinder 61 is mounted on the support frame 11, the arc-extinguishing chamber 611 is installed inside the insulating cylinder 61, the upper end of the insulating pull rod 612 is connected to the moving contact of the arc-extinguishing chamber 611, and the lower end of the insulating pull rod 612 is connected to the circuit breaker operating mechanism 2 through the transmission shaft 4. One end of the flexible connection 613 is connected to the isolating stationary contact, and the other end of the flexible connection 613 is connected to the moving contact of the arc-extinguishing chamber 611.

[0060] In the above optional embodiments, it should be noted that a primary circuit conductive component is integrally cast inside the solidified pole 6; in addition, a prototype conductive block 65 for connection with the main busbar is also included. The prototype conductive block 65 is solidified at the upper end of the insulating cylinder 61 and connected to the stationary contact of the arc-extinguishing chamber 611; a heat dissipation hole 614 is also provided at the upper end of the insulating cylinder 61 to ensure heat dissipation effect; an air gap is provided around the vacuum arc-extinguishing chamber 611 to ensure internal air circulation and facilitate heat dissipation; the insulating cylinder 61 is cylindrical in shape to make the electric field distribution uniform and satisfy the chimney effect, which is beneficial to the heat dissipation of the pole.

[0061] Optional, such as Figures 1 to 7 As shown, the solid-sealed pole 6 also includes a crank arm connecting block 66 and a crank arm 64. The crank arm connecting block 66 is installed at the lower end of the insulating pull rod 612. One end of the crank arm 64 is fixedly installed on the drive shaft 4, and the other end of the crank arm 64 is connected to the crank arm connecting block 66 through a pin.

[0062] In the above optional embodiments, it should be noted that the solid-sealing pole 6 further includes a first fixing nut 62, a second fixing nut 63, a crank arm connecting block 66, and a crank arm 64. The first fixing nut 62 and the second fixing nut 63 are installed at intervals on the lower end of the insulating pull rod 612. The transmission shaft 4 includes a shaft body 41. Both ends of the shaft body 41 are respectively connected to the first support plate 112 and the second support plate 113 through a shaft seat. A bushing is sleeved on the shaft body 41. One end of the crank arm 64 is welded to the bushing, and the other end of the crank arm 64 is connected to the crank arm connecting block through a pin. 66, the crank arm connecting block 66 is sleeved on the insulating tie rod 612 and is located between the first fixing nut 62 and the second fixing nut 63; the first fixing nut 62, the second fixing nut 63, the crank arm connecting block 66 and the crank arm 64 are all located inside the transmission box 8. Four partitions 81 are installed at intervals inside the transmission box 8. The first fixing nut 62, the second fixing nut 63, the crank arm connecting block 66 and the crank arm 64 of each solidified pole post 6 are located between two of the partitions 81. The partitions 81 can further strengthen the support frame 11 and the transmission box 8.

[0063] The advantages of the above optional embodiments are that the arrangement of the crank arm connecting block 66 and the crank arm 64 ensures the reliability of the on / off state of the solid-sealed pole 6.

[0064] Optional, such as Figures 1 to 3 , Figure 5 , Figure 6 , Figure 15 and Figure 16 As shown, the three-position disconnect switch 7 also includes a moving knife holder 731, a supporting insulator 732, and a grounding bracket 721. The moving knife holder 731 is connected to the support frame 11 through the supporting insulator 732. The three-position rotating shaft 5 and the moving knife 73 are connected to the moving knife holder 731 through the same rotating shaft. The grounding bracket 721 is installed on the support frame 11, and the grounding stationary knife 72 is installed on the grounding bracket 721.

[0065] In the above optional embodiments, it should be noted that the three-station rotating main shaft 5 and the moving blade 73 are coaxially sleeved on a rotating shaft, and the rotating shaft is fixedly connected to the moving blade holder 731 or rotatably connected through a bearing; specifically, the first three-station rotating shaft 52 and the moving blade 73 of the one-phase three-station disconnector 7 are coaxially sleeved on a rotating shaft, and the rotating shaft is fixedly connected to the moving blade holder 731 or rotatably connected through a bearing; the second three-station rotating shaft 53 and the moving blade 73 of the one-phase three-station disconnector 7 are coaxially sleeved on a rotating shaft, and the rotating shaft is fixedly connected to the moving blade holder 731 or rotatably connected through a bearing; the third three-station rotating shaft 54 ​​and the moving blade 73 of the one-phase three-station disconnector 7 are coaxially sleeved on a rotating shaft, and the rotating shaft is fixedly connected to the moving blade holder 731 or rotatably connected through a bearing.

[0066] The advantages of the above optional embodiments are: the reliability of the rotation of the moving blade 73 is further increased by the setting of the moving blade holder 731; the creepage distance can be effectively increased by the setting of the supporting insulator 732 and the shed structure 7321.

[0067] Optional, such as Figures 1 to 3 , Figure 5 , Figure 6 , Figure 15 and Figure 16 As shown, the three-position disconnect switch 7 also includes a grounding buffer pad 722, an isolation buffer pad 711, and a pad 733. The grounding buffer pad 722 is disposed on the grounding stationary knife 72, the isolation buffer pad 711 is disposed on the isolation stationary knife 71, and the pad 733 is disposed between the supporting insulator 732 and the support frame 11.

[0068] In the above optional embodiments, it should be noted that a grounding busbar 723 is also included. The grounding busbar 723 is installed on the intermediate crossbeam 111 by bolt connection. The grounding stationary blade 72 is installed on the grounding busbar 723 by bolt connection, and the grounding busbar 723 is a three-phase busbar grounding busbar 723. The grounding buffer pad 722 is set on both sides of the grounding stationary blade 72 by adhesive or bolt connection, and the isolation buffer pad 711 is adhesively attached to the isolation stationary blade 71. The pad plate 733, the supporting insulator 732, and the support frame 11 are connected by bolts.

[0069] The advantages of the above optional embodiments are as follows: the pad 733 can support and strengthen the moving knife holder 731, and the grounding buffer pad 722 and the isolation buffer pad 711 can buffer the engagement between the moving knife 73 and the grounded stationary knife 72 or the isolated stationary knife 71, thereby indirectly reducing wear and increasing reliability.

[0070] Optional, such as Figures 1 to 3 , Figure 5 , Figure 6 , Figure 15 and Figure 16 As shown, the moving blade 73 includes two moving blades 734, a connecting pin 735, two compression springs 736, and two abutting blocks 737. Both moving blades 734 are connected to the moving blade holder 731 via a rotating shaft. The two moving blades 734 are connected to each other via the connecting pin 735. One moving blade 734 is connected to one abutting block 737 via one compression spring 736, and the other moving blade 734 is connected to the other abutting block 737 via another compression spring 736. Both abutting blocks 737 are fixedly connected to the three-station rotating main shaft 5. Each moving blade 734 includes an integrally formed blade body portion 7341, a protrusion 7342, and an arc portion 7343. The protrusion 7342 is located at one end of the blade body portion 7341 and is used to contact the isolation stationary blade 71 or the grounding stationary blade 72. The arc portion 7343 is located on one side of the blade body portion 7341, and the thickness of the protrusion 7342 is greater than the thickness of the blade body portion 7341.

[0071] In the above optional embodiments, it should be noted that the blade body 7341, the protrusion 7342 and the arc portion 7343 are integrally formed; the surface of the protrusion 7342 is silver-plated and the silver layer thickness is ≥5μm, reducing the contact resistance to ≤15μΩ and achieving a temperature rise of ≤60K under a rated current of 1250A.

[0072] The advantages of the above optional embodiments are as follows: the protrusion 7342 can effectively increase the contact area between the moving blade 73 and the isolated stationary blade 71 or the grounded stationary blade 72, thereby reducing the risk of poor contact; because current has a skin effect, the arc portion 7343 can increase the surface area of ​​the moving blade 734, thereby increasing the surface heat dissipation effect.

[0073] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A 35kV 1250A compact gas-insulated ring main unit, characterized in that, It includes a gas box (1), a support frame (11), a disconnector operating mechanism (3), a circuit breaker operating mechanism (2), a drive shaft (4), a three-position rotating shaft (5), a solid-sealed pole (6) with the same three-phase structure located in the gas box (1), and a three-position disconnector (7) with the same three-phase structure located in the gas box (1). The support frame (11) is installed inside the gas box (1); the disconnector operating mechanism (3) and the circuit breaker operating mechanism (2) are both installed on one side of the gas box (1); the drive shaft (4) is installed on the support frame (11) through a bearing seat, the three-position rotating shaft (5) is installed on the support frame (11) through a bearing seat, and the disconnector operating mechanism (3) is connected to one end of the three-position rotating shaft (5); The solid-sealed pole (6) is mounted on the support frame (11), and the solid-sealed pole (6) is connected to the circuit breaker operating mechanism (2) through the transmission shaft (4); the three-position disconnect switch (7) includes a stationary isolation knife (71), a stationary grounding knife (72) and a moving knife (73). The stationary isolation knife (71) is mounted on one side of the solid-sealed pole (6), the stationary grounding knife (72) is mounted on the support frame (11), and the moving knife (73) is mounted on the three-position rotating shaft (5); When the circuit is open, the moving knife (73) is located between the grounding stationary knife (72) and the isolating stationary knife (71). When grounding, the moving knife (73) engages with the grounding stationary knife (72). When the circuit is closed, the moving knife (73) engages with the isolating stationary knife (71).

2. The 35kV 1250A compact gas-insulated ring main unit according to claim 1, characterized in that, The three-station rotating shaft (5) includes a first rotating shaft (51), a first three-station rotating shaft (52), a second three-station rotating shaft (53), a third three-station rotating shaft (54), and a second rotating shaft (55) connected sequentially from head to tail. The first rotating shaft (51) is mounted on one end of the support frame (11) via a bearing seat, and the second rotating shaft (55) is mounted on the other end of the support frame (11) via a bearing seat; The moving blades (73) of the three-phase three-position disconnect switch (7) are respectively mounted on the first three-position rotating shaft (52), the second three-position rotating shaft (53) and the third three-position rotating shaft (54); The disconnector switch operating mechanism (3) is connected to the first rotating shaft (51).

3. The 35kV 1250A compact gas-insulated ring main unit according to claim 2, characterized in that, The first three-station rotating shaft (52) includes a first left plug shaft (521), a first crank arm (522) and a first right plug shaft (523) that are fixedly connected from left to right. The second and third station rotating shaft (53) includes a second left plug shaft (531), a second crank arm (532), and a second right plug shaft (533) that are fixedly connected from left to right. The third three-position rotating shaft (54) includes a third left plug-in shaft (541), a third crank arm (542) and a third right plug-in shaft (543) that are fixedly connected from left to right. The first left insertion shaft (521) is fixedly connected to the first rotating shaft (51), the first right insertion shaft (523) is fixedly connected to the second left insertion shaft (531), the second right insertion shaft (533) is fixedly connected to the third left insertion shaft (541), and the third right insertion shaft (543) is fixedly connected to the second rotating shaft (55). The moving blades (73) of the three-phase three-position disconnect switch (7) are respectively installed on the first crank arm (522), the second crank arm (532) and the third crank arm (542).

4. The 35kV 1250A compact gas-insulated ring main unit according to claim 3, characterized in that, The first three-station rotating shaft (52) also includes a first reinforcing rib (524), and the first reinforcing rib (524) is fixedly connected between the first left insert shaft (521) and the first crank arm (522) and between the first right insert shaft (523) and the first crank arm (522). The second third station rotating shaft (53) also includes a second reinforcing rib (534). The second reinforcing rib (534) is fixedly connected between the second left insert shaft (531) and the second crank arm (532) and between the second right insert shaft (533) and the second crank arm (532). The third three-position rotating shaft (54) also includes a third reinforcing rib (544). The third reinforcing rib (544) is fixedly connected between the third left insertion shaft (541) and the third crank arm (542) and between the third right insertion shaft (543) and the third crank arm (542).

5. The 35kV 1250A compact gas-insulated ring main unit according to claim 2, characterized in that, The three-station rotating shaft (5) also includes a first connecting end cap (56) and a second connecting end cap (57). The first left insertion shaft (521) is connected to the first rotating shaft (51) through the first connecting end cap (56), and the third right insertion shaft (543) is connected to the second rotating shaft (55) through the second connecting end cap (57).

6. The 35kV 1250A compact gas-insulated ring main unit according to claim 5, characterized in that, The solid-sealed pole (6) includes an insulating cylinder (61), an arc-extinguishing chamber (611), an insulating pull rod (612), and a flexible connection (613). The insulating cylinder (61) is mounted on the support frame (11), the arc-extinguishing chamber (611) is mounted inside the insulating cylinder (61), the upper end of the insulating pull rod (612) is connected to the moving contact of the arc-extinguishing chamber (611), the lower end of the insulating pull rod (612) is connected to the circuit breaker operating mechanism (2) through the transmission shaft (4), one end of the flexible connection (613) is connected to the isolating stationary contact, and the other end of the flexible connection (613) is connected to the moving contact of the arc-extinguishing chamber (611).

7. The 35kV 1250A compact gas-insulated ring main unit according to claim 5, characterized in that, The solid-sealed pole (6) also includes a crank arm connecting block (66) and a crank arm (64). The crank arm connecting block (66) is installed at the lower end of the insulating pull rod (612). One end of the crank arm (64) is fixedly installed on the drive shaft (4), and the other end of the crank arm (64) is connected to the crank arm connecting block (66) through a pin.

8. The 35kV 1250A compact gas-insulated ring main unit according to claim 2, characterized in that, The three-position disconnect switch (7) also includes a moving knife holder (731), a supporting insulator (732), and a grounding bracket (721). The moving knife holder (731) is connected to the support frame (11) through the supporting insulator (732). The three-position rotating shaft (5) and the moving knife (73) are connected to the moving knife holder (731) through the same rotating shaft. The grounding bracket (721) is installed on the support frame (11), and the grounding stationary knife (72) is installed on the grounding bracket (721).

9. The 35kV 1250A compact gas-insulated ring main unit according to claim 7, characterized in that, The three-position disconnect switch (7) also includes a grounding buffer pad (722), an isolation buffer pad (711), and a pad plate (733). The grounding buffer pad (722) is disposed on the grounding stationary knife (72), the isolation buffer pad (711) is disposed on the isolation stationary knife (71), and the pad plate (733) is disposed between the supporting insulator (732) and the support frame (11).

10. The 35kV 1250A compact gas-insulated ring main unit according to claim 9, characterized in that, The moving blade (73) includes two moving blades (734), a connecting pin (735), two compression springs (736), and two abutment blocks (737). Both of the moving blades (734) are connected to the moving blade holder (731) via a rotating shaft. The two moving blades (734) are connected to each other via a connecting pin (735). One of the moving blades (734) is connected to one of the abutting blocks (737) via one of the compression springs (736). The other moving blade (734) is connected to the other abutting block (737) via another compression spring (736). Both abutting blocks (737) are fixedly connected to the three-station rotating main shaft (5). Each of the moving blades (734) includes an integrally formed blade body (7341), a protrusion (7342), and an arcuate portion (7343). The protrusion (7342) is located at one end of the blade body (7341) and is used to contact the isolation stationary blade (71) or the grounding stationary blade (72). The arcuate portion (7343) is located on one side of the blade body (7341). The thickness of the protrusion (7342) is greater than the thickness of the blade body (7341).

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