An environmental protection gas insulated load switch with a transfer vacuum breaking branch

Abstract

The utility model relates to electric power switch equipment technical field discloses an environmental protection gas insulation load switch with transfer vacuum breaking branch, including transfer vacuum breaking assembly, grounding assembly, isolation component, rotating component, switch frame, five mutual combination uses play the role, realize the linkage action of transfer vacuum breaking assembly branch and main switch, there is no suspended potential metal piece, and the partial discharge level is low, and the transfer vacuum breaking assembly switch just separates the time point adjustable, guarantees the gate synchronism, and the branch of transfer vacuum breaking assembly does not influence the short circuit closing performance of main switch.

Description

Technical Field

[0001] This utility model relates to the field of power switchgear, specifically an environmentally friendly gas-insulated load switch with a transfer vacuum interruption branch. Background Technology

[0002] Currently, most gas-insulated load switches use SF6 for breaking. SF6 is a greenhouse gas, and its arc decomposition products are toxic and environmentally unfriendly. Therefore, environmentally friendly gas-insulated load switches have emerged in existing technologies. However, environmentally friendly gases have poor arc-extinguishing performance, and most of them use a three-position disconnector in series with a vacuum interrupter. The vacuum interrupter is used to break the load current, and the three-position disconnector is used to form a reliable isolation break. This solution is not only costly, but also requires the disconnector to be closed first and then the vacuum interrupter to be closed when the load switch is closed, and the vacuum interrupter to be opened first and then the disconnector to be opened when the load switch is opened. This requires two operating mechanisms, which is cumbersome and the operating habits are inconsistent with the original SF6 load switch operating habits.

[0003] For example, patent CN112509859A discloses an environmentally friendly load switch. It uses an arc-extinguishing chamber to extinguish the arc, eliminating the need for SF6 gas during the extinguishing process, thus resulting in higher reliability and no environmental pollution.

[0004] However, in the aforementioned switching device, the transmission arm controlled by the arc-extinguishing chamber is made of conductive material. When the load switch closes, the isolating blade will short-circuit and break down with the transmission arm first, prematurely igniting a high-energy short-circuit arc. The transmission arm itself and the vacuum breaking circuit it belongs to cannot withstand the instantaneous short-circuit current and will be burned by the arc. At the same time, the other end of the arc will burn the isolating blade, resulting in the loss of the basic switching function. It can be determined that this switch does not have short-circuit closing capability and does not meet the basic requirements of a load switch. The moving end of the arc-extinguishing chamber of this switching device has a fixed assembly structure, and the position of the connecting post in the elongated hole cannot be changed. As a result, the splitting time is not adjustable, and the switching synchronization time cannot be guaranteed. Usually, when it exceeds 3ms, it will affect the breaking performance.

[0005] For example, patent CN117727599A discloses a vacuum parallel breaking load switch. This solution is a direct-acting transfer vacuum breaking load switch, which has a complex structure, many transmission and coordination parts, and the motion connection between the vacuum interrupter and the main switch needs to be very precise, resulting in many potential failure points. To solve the insulation problem, this switching device uses various irregularly shaped composite insulating conductors and support components, leading to high manufacturing costs. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides an environmentally friendly gas-insulated load switch with a transfer vacuum interruption branch to solve the aforementioned problems.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0008] An environmentally friendly gas-insulated load switch with a transfer vacuum breaking branch includes a transfer vacuum breaking component, a grounding component, an isolating component, a rotating component, and a switch frame. The grounding component and the isolating component are respectively mounted on the switch frame. The rotating component is rotatably connected to the switch frame and located between the grounding component and the isolating component. The transfer vacuum breaking component is connected to the isolating component and located above the rotating component.

[0009] The vacuum interrupting assembly includes a vacuum interrupter assembly, a spring cylinder assembly, a connecting rod, a crank arm, a cover plate, and a second contact. The crank arm is positioned on both sides of the vacuum interrupter assembly with a limiting linkage. One end of the connecting rod is connected to both sides of the spring cylinder assembly, and the other end is connected to the crank arm. The second contact is integrally formed and embedded in the cover plate, which is connected to the crank arm. By designing a circuit transfer function, the switch during the equipment's interruption phase is changed from a traditional knife switch to a vacuum interrupter switch, enabling the entire equipment to have the ability to interrupt load switches. This is particularly suitable for environmentally friendly gas-insulated switchgear where the insulating gas does not have arc-extinguishing capabilities. Compared to traditional environmentally friendly gas-insulated switchgear that uses a vacuum interrupter as the main... In the load switch design, the transfer vacuum interrupter assembly is located in the branch interruption circuit, only briefly bearing fault current for milliseconds, not requiring it to withstand short-circuit current for seconds. Furthermore, the vacuum interrupter only needs to withstand the transient recovery voltage during interruption, not the rated breaking voltage. This allows for a significant reduction in conductor cross-section and ceramic shell volume compared to traditional designs, resulting in a cost advantage. The spring cylinder assembly in the branch circuit is installed on the high-potential main busbar. The spherical head of the spring cylinder assembly provides voltage equalization, and the mounting screws for the insulation components are all made of plastic. The overall structure lacks any floating potential metal parts, ensuring an extremely low partial discharge level for the switchgear. The overtravel section can be easily adjusted to regulate the opening timing of the transfer vacuum interrupter assembly, ensuring synchronous operation of the three-phase vacuum interrupter assembly. It boasts high structural versatility; the opening timing, opening speed, and total stroke of the vacuum interrupter assembly can be adjusted by modifying the groove shape of the crank arm. Furthermore, the independent transfer vacuum interrupter assembly assembly structure is designed to accommodate the largest possible interrupter size, allowing it to adapt to similar vacuum interrupter products with different parameters. With the same product structure, only the crank arm and the main body of the vacuum interrupter need to be replaced to convert it into a load switch for multiple voltage levels, such as 24kV, 17.5kV, and 10kV. The second contact is designed as a ball contact structure, and its contact with the isolating blade... As a point contact, the resistance to the sliding displacement of the second contact on the isolating blade is much smaller than that of line contact and surface contact contact schemes, minimizing the impact on the opening speed of the main switch. The isolating blade can clamp the second contact before leaving the isolating contact, and there is no bouncing during the energized switching process. There will be no burning between the contacts due to the arcing caused by the bouncing. In contrast, in the existing technology where the second contact slides along the edge of the isolating blade, there is a certain speed when the isolating blade contacts the second contact, and there will inevitably be the problem of bouncing and arcing during the acceleration phase. The crank arm of similar products is designed to give way to the main blade when closing by making the crank arm segmented, with only two segments of the crank arm able to rotate in opposite directions. An additional set of springs is needed to reset the two segments of the crank arm.This structure, through the design of the groove shape on the crank arm, allows the crank arm to rotate in the opposite direction when the main switch is closed. When the isolating knife is in place, the crank arm springs back under the action of the spring cylinder compression spring. The overall design uses fewer parts, has fewer failure points, a high safety factor, and does not have a floating potential reset spring.

[0010] Preferably, the grounding assembly includes a grounding bar, a grounding beam, and grounding contacts. The grounding beam is fixed on the switch frame, and the grounding contacts are pressed onto the grounding bar. The grounding bar is connected to the grounding beam and the switch frame respectively.

[0011] Preferably, the isolation assembly includes a busbar, insulator A, isolation contact, and upper crossbeam. The isolation contact is pressed onto the busbar, the busbar is connected to one end of insulator A, the other end of insulator A is connected to the upper crossbeam, and the upper crossbeam is fixed to the switch frame.

[0012] Preferably, buffer pads are provided on both sides of the isolation contact.

[0013] Preferably, the rotating assembly includes an insulating spindle, an isolating blade, a fixing sleeve, an adapter rod, an insulator B, and a lower crossbeam. The isolating blade is hinged to the adapter rod, the fixing sleeve is connected to one end of the insulator B and has the adapter rod sleeved in the middle, the other end of the insulator B is fixed to the lower crossbeam, the lower crossbeam is fixed to the switch frame, and the insulating spindle is rotatably connected to the switch frame on both sides and has an isolating blade sleeved inside.

[0014] Preferably, the isolation blade has a double-blade structure and is provided with a pressure equalizing sleeve at the end.

[0015] Preferably, the transfer vacuum interruption assembly further includes a stationary end bracket and a bracket A. The stationary end bracket is fixed on the busbar and has a threaded hole inside for threaded connection to the vacuum interrupter assembly. One end of the bracket A is fixed on the busbar and the other end is connected to the vacuum interrupter assembly.

[0016] Preferably, the connecting rod is provided with a spring cylinder connecting hole, a connecting rod positioning post, and an internal screw. The spring cylinder connecting hole is hinged to both sides of the spring cylinder assembly by a pin and a retaining ring. The connecting rod positioning post is connected to the crank arm. The internal screw is located at the opposite end of the spring cylinder connecting hole and fixes the connecting rods on both sides.

[0017] Preferably, the crank arm is provided with a groove, a shaft hole, a pin hole, and a through hole. The groove is curved, the pin hole is fixed to the cover plate, and the through hole is connected to the connecting rod positioning post.

[0018] Preferably, the vacuum interrupter assembly includes a vacuum interrupter body, a pull rod cylinder, a core rod, a contact spring, a driven rod, an end cap, a wire, a disc spring, and a retaining shaft. The vacuum interrupter body is threadedly connected to the stationary end support. The contact spring is inserted into the inner circular hole of the pull rod cylinder. The core rod fits into the inner circular hole of the pull rod cylinder and presses down on the contact spring. The driven rod passes sequentially through the waist holes on both sides of the support A, the waist holes on both sides of the pull rod cylinder, and the circular hole of the core rod body. Both ends of the driven rod are correspondingly located in grooves. The end cap is fixed to the support A and has a core hole. The core hole fits into the core rod in a limiting manner. Both ends of the wire have O-shaped terminals. The upper end of the pull rod cylinder has a stud structure. The stud structure is sequentially fitted into the disc spring and the O-shaped terminal at one end of the wire, and screwed into the vacuum interrupter body. The other end of the wire passes through the slot on the end cap and connects to the second contact. The retaining shaft is located on the end cap and is correspondingly connected to the shaft hole.

[0019] Preferably, the spring cylinder assembly includes a spring cylinder body, a compression spring, a cylinder rod, a plunger, a clip, and a mounting base. The compression spring is placed inside the spring cylinder body. One end of the cylinder rod is inserted into the spring cylinder body, and after passing through the compression spring, the stepped surface of the spring cylinder body abuts against one side of the compression spring. The other end of the cylinder rod is fitted with a clip, which abuts against the other side of the compression spring. The plunger is threadedly connected to the spring cylinder body and has an opening in the middle corresponding to the cylinder rod. The cylinder rod is connected to a connecting rod. The mounting base is fixed on a busbar, and the spring cylinder body is threadedly connected to the mounting base.

[0020] Compared to existing technologies, this utility model discloses an environmentally friendly gas-insulated load switch with a transfer vacuum breaking branch, comprising a transfer vacuum breaking component, a grounding component, an isolation component, a rotating component, and a switch frame, which work together to perform their functions.

[0021] ① By designing the circuit transfer function, the switch in the equipment breaking stage is changed from a traditional knife switch to a vacuum interrupter switch, so that the whole equipment has the ability to break load switches. This is especially suitable for environmentally friendly gas-insulated switchgear where the insulating gas does not have the ability to extinguish arcs.

[0022] ② Compared with the traditional load switch scheme that uses a vacuum interrupter as the main switch in environmentally friendly gas-insulated switchgear, the transfer vacuum interruption component is set in the interruption circuit of the branch, and only briefly bears the fault current for milliseconds, without having to bear the short-circuit current for seconds; and the vacuum interrupter only needs to bear the transient recovery voltage during interruption, without having to bear the rated break voltage. The conductor cross-section and ceramic shell volume of the suitable vacuum interrupter component can be greatly reduced compared with the traditional scheme, forming a cost advantage.

[0023] ③ The spring cylinder assembly of the branch circuit is installed on the high-potential main bus. The spherical head of the spring cylinder assembly has the function of equalizing voltage, and the mounting screws of the insulating parts are all made of plastic. The overall structure has no metal parts with floating potential, which ensures the extremely low partial discharge level of the switchgear.

[0024] ④ The overtravel of the transfer vacuum interrupter can be easily adjusted, which can be used to adjust the opening time of the transfer vacuum interrupter to ensure the synchronous level of the opening of the three-phase vacuum interrupter.

[0025] ⑤ It has high structural versatility. By modifying the groove shape of the crank arm, the breaking time, opening speed, and total stroke of the vacuum interrupter assembly can be adjusted. In addition, the independent transfer vacuum interrupter assembly structure is designed to accommodate the largest size interrupter, so it can be adapted to similar vacuum interrupter products with different parameters. With the same product structure, only the crank arm and the main body of the vacuum interrupter need to be changed to convert it into a load switch for multiple voltage levels such as medium voltage 24kV, 17.5kV, and 10kV.

[0026] ⑥ The second contact is designed as a ball contact structure, and its contact with the isolating blade is a point contact. The resistance of the second contact sliding on the isolating blade is much smaller than that of the line contact and surface contact contact schemes, thus minimizing the impact on the opening speed of the main switch.

[0027] ⑦ The isolation blade can clamp the second contact before leaving the isolation contact. There is no bouncing during the energized transfer of the contacts, and there will be no burning caused by the arcing due to the bouncing between the contacts. In contrast, in the existing technology, the second contact slides along the edge of the isolation blade. Because the isolation blade has a certain speed when it contacts the second contact, and is in the acceleration phase, there will definitely be the problem of bouncing and arcing.

[0028] ⑧ Similar products use a segmented design for the crank arm to allow the main switch to close, with only two segments able to rotate in the opposite direction. This requires an additional set of springs to reset the two segments. In contrast, this design utilizes a grooved groove on the crank arm, allowing it to rotate in the opposite direction when the main switch closes. Once the isolating switch is in place, the crank arm springs back under the pressure of the spring cylinder. This design uses fewer parts, has fewer potential failure points, a higher safety factor, and eliminates the need for a floating potential reset spring. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the environmentally friendly gas-insulated load switch with a transfer vacuum interruption branch of this utility model;

[0030] Figure 2 This is a schematic diagram of the basic structure of the rotary three-position switch of this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the vacuum transfer switching assembly of this utility model;

[0032] Figure 4 This is a schematic diagram of the structure of the vacuum interrupter assembly of this utility model;

[0033] Figure 5 This is a schematic diagram illustrating the structural working principle of the vacuum interrupter assembly of this utility model;

[0034] Figure 6 This is a schematic diagram of the spring cylinder assembly of this utility model;

[0035] Figure 7 This is a schematic diagram of the main switch closing of the environmentally friendly gas-insulated load switch with a vacuum transfer branch according to this utility model.

[0036] Figure 8 This is a schematic diagram of the parallel circuit of the environmentally friendly gas-insulated load switch with a transfer vacuum interruption branch of this utility model.

[0037] Figure 9 This is a schematic diagram showing the circuit transfer of the environmentally friendly gas-insulated load switch with the vacuum disconnection branch of this utility model to VI.

[0038] Figure 10 This is a schematic diagram of the VI-opening to VI-opening position of the environmentally friendly gas-insulated load switch with a transfer vacuum disconnection branch of this utility model.

[0039] Figure 11 This is a schematic diagram showing the VI tripping position to the main tripping position of the environmentally friendly gas-insulated load switch with a transfer vacuum disconnection branch of this utility model.

[0040] Figure 12 This is a schematic diagram of the isolating knife closing of the environmentally friendly gas-insulated load switch with a transfer vacuum interruption branch of this utility model. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0042] An environmentally friendly gas-insulated load switch with a transfer vacuum breaking branch includes a transfer vacuum breaking component 1, a grounding component 2, an isolation component 3, a rotating component 4, and a switch frame 5. The grounding component 2 and the isolation component 3 are respectively disposed on the switch frame 5. The rotating component 4 is rotatably connected to the switch frame 5 and is located between the grounding component 2 and the isolation component 3. The transfer vacuum breaking component 1 is connected to the isolation component 3 and is located above the rotating component 4.

[0043] The vacuum interruption assembly 1 includes a vacuum interrupter assembly 11, a spring cylinder assembly 12, a connecting rod 13, a crank arm 14, a cover plate 15, and a second contact 16. The crank arm 14 is configured in a limiting linkage manner on both sides of the vacuum interrupter assembly 11. One end of the connecting rod 13 is connected to both sides of the spring cylinder assembly 12, and the other end is connected to the crank arm 14. The second contact 16 is integrally formed and embedded in the cover plate 15. The cover plate 15 is connected to the crank arm 14.

[0044] The grounding assembly 2 includes a grounding bar 21, a grounding beam 22, and a grounding contact 23. The grounding beam 22 is fixed on the switch frame 5, and the grounding contact 23 is pressed onto the grounding bar 21. The grounding bar 21 connects the grounding beam 22 and the switch frame 5 respectively.

[0045] The isolation assembly 3 includes a busbar 31, an insulator A32, an isolation contact 33, and an upper crossbeam 34. The isolation contact 33 is pressed onto the busbar 31. The busbar 31 is connected to one end of the insulator A32, and the other end of the insulator A32 is connected to the upper crossbeam 34. The upper crossbeam 34 is fixed on the switch frame 5.

[0046] The isolation contact 33 is provided with buffer pads 331 on both sides.

[0047] The rotating assembly 4 includes an insulating spindle 41, an isolating blade 42, a fixing sleeve 43, an adapter rod 44, an insulator B45, and a lower crossbeam 46. The isolating blade 42 is hinged to the adapter rod 44. The fixing sleeve 43 is connected to one end of the insulator B45, and the adapter rod 44 is sleeved in the middle. The other end of the insulator B45 is fixed to the lower crossbeam 46, which is fixed to the switch frame 5. The insulating spindle 41 is rotatably connected to the switch frame 5 on both sides, and the isolating blade 42 is sleeved inside it.

[0048] Busbar 31 is connected to the incoming power supply side, and adapter bar 44 is connected to the outgoing load side. During operation, rotating the insulating spindle 41 drives the isolating blade 42 to switch states. When the isolating blade 42 clamps the isolating contact 33, it is in the closed state. Figure 2 When in the middle position, it is in the open state; when the isolating knife 42 clamps the grounding contact 23, it is in the grounding state.

[0049] The insulating spindle 41 is made of high-strength insulating plastic; insulators A32 and B45 are both epoxy cast parts; isolating blade 42, isolating contact 33, grounding contact 23, busbar 31, grounding busbar 21 and adapter rod 44 are all made of high-conductivity hard metal; the switch frame 5 is made of welded steel; the fixing sleeve 43 and the equalizing sleeve are made of hard metal.

[0050] The isolation blade 42 has a double-blade structure and is equipped with a pressure equalization sleeve at the end.

[0051] The transfer vacuum interruption assembly 1 also includes a stationary end bracket 17 and a bracket A18. The stationary end bracket 17 is fixed on the busbar 31 and has a threaded hole inside for threaded connection to the vacuum interrupter assembly 11. One end of the bracket A18 is fixed on the busbar 31 and the other end is connected to the vacuum interrupter assembly 11.

[0052] The connecting rod 13 is provided with a spring cylinder connecting hole 131, a connecting rod positioning post 132, and an inner screw 133. The spring cylinder connecting hole 131 is hinged to both sides of the spring cylinder assembly 12 by pins and retaining rings. The connecting rod positioning post 132 is connected to the crank arm 14. The inner screw 133 is located at the opposite end of the spring cylinder connecting hole 131 and fixes the connecting rods 13 on both sides. The inner screw 133 pulls the connecting rod 13 tight to prevent the connecting rod positioning post 132 from slipping out of the crank arm 14. On the other hand, it also serves to limit the rotation of the crank arm 14.

[0053] The cover plate 15 is made of insulating plastic, and the second contact 16 is embedded in the cover plate 15 and is integrally formed during injection molding.

[0054] The crank arm 14, connecting rod 13, cover plate 15, bracket A18, pin, and bolt are made of high-strength insulating plastic, while the stationary end bracket 17 is made of hard metal.

[0055] The crank arm 14 is provided with a groove 141, a shaft hole 142, a pin hole 143, and a through hole 144. The groove 141 is curved. The pin hole 143 is pin-connected to the cover plate 15 and fixed. The through hole 144 is connected to the connecting rod positioning post 132.

[0056] The vacuum interrupter assembly 11 includes a vacuum interrupter body 111, a pull rod cylinder 112, a core rod 113, a contact spring 114, a driven rod 115, an end cap 116, a wire 117, a disc spring 118, and a retaining shaft 119. The vacuum interrupter body 111 is threadedly connected to the stationary end support 17. The contact spring 114 is inserted into the inner circular hole of the pull rod cylinder 112. The core rod 113 fits into the inner circular hole of the pull rod cylinder 112 and presses down on the contact spring 114. The driven rod 115 passes sequentially through the waist holes on both sides of the support A18, the waist holes on both sides of the pull rod cylinder 112, and the circular hole in the body of the core rod 113, and is driven by... The rod 115 has two ends correspondingly located in the groove 141. The end cap 116 is fixed to the bracket A18 and has a core hole. The core hole fits into the core rod 113 in a limiting manner. The wire 117 has O-shaped terminals at both ends. The upper end of the pull rod cylinder 112 has a stud structure. The stud structure is sequentially fitted into the disc spring 118 and the O-shaped terminal at one end of the wire 117, and then screwed into the vacuum interrupter body 111. The other end of the wire 117 passes through the slot on the end cap 116 and connects to the second contact 16. The retaining shaft 119 is located on the end cap 116 and is correspondingly connected to the shaft hole 142.

[0057] The core hole engages with the core rod 113 to restrict the degree of freedom and ensure that the movement direction of VI is along its axis. The position of the pull rod cylinder 112 can be adjusted by rotating the vacuum interrupter body 111. The position of the driven rod 115 is fixed by the crank arm 14. During adjustment, the waist hole of the pull rod cylinder 112 is displaced relative to the driven rod 115, that is, the overtravel distance is adjusted. It can also be used to adjust the synchronous tripping time of the three-phase interrupter.

[0058] The end of the core rod 113 that is inserted into the core hole can be designed with a connection structure, such as a thread to connect a displacement sensor to test the time displacement parameters of the VI action, or it can be determined according to the actual working conditions.

[0059] The driven rod 115 and the crank arm 14 are designed with a cam-like structure. When the VI circuit is opened, the driven rod 115 is driven by the crank arm 14 to move from one end of the waist hole of the pull rod cylinder 112 to the other end, releasing the pressure of the contact spring 114 on the moving end of the arc-extinguishing chamber. The arc-extinguishing chamber contacts are about to separate, which is the overtravel section of the total stroke of the arc-extinguishing chamber. Then the driven rod 115 abuts against the pull rod cylinder 112 and, under the limit of the waist hole of the bracket, moves to the rated opening distance of the arc-extinguishing chamber, and the circuit is opened, which is the opening distance section of the total stroke.

[0060] The spring cylinder assembly 12 includes a spring cylinder body 121, a compression spring 122, a cylinder rod 123, a plunger 124, a clip 125, and a mounting base 126. The compression spring 122 is placed inside the spring cylinder body 121. One end of the cylinder rod 123 is inserted into the spring cylinder body 121, and after passing through the compression spring 122, the stepped surface of the spring cylinder body 121 abuts against one side of the compression spring 122. The other end of the cylinder rod 123 is fitted with the clip 125, which abuts against the other side of the compression spring 122. The plunger 124 is threadedly connected to the spring cylinder body 121 and has an opening in the middle corresponding to the cylinder rod 123. The cylinder rod 123 is connected to the connecting rod 13. The mounting base 126 is fixed on the busbar 31, and the spring cylinder body 121 is threadedly connected to the mounting base 126.

[0061] When the spring cylinder assembly 12 is not subjected to external force, it is in a free state, and the cylinder rod 123 is pressed... Figure 6 When the cylinder rod 123 moves to the right in the indicated direction, it presses against the card 125 and the compression spring 122. When the external force disappears, it returns to its free state under the action of the compression spring 122; the cylinder rod 123 presses... Figure 6 When the cylinder rod 123 moves to the left in the indicated direction, the step of the cylinder rod 123 compresses the spring, and the rod head of the cylinder rod 123 extends into the plunger 124. When the external force disappears, it returns to its free state under the action of the compression spring 122.

[0062] In the free state, the crank arm 14 is pulled by the connecting rod 13, so that the driven rod 115 is stopped in the design position, that is, the vacuum interrupter is kept in the closed position.

[0063] Operating conditions:

[0064] When the main switch is closed, such as Figure 7 As shown, the compression spring 122 inside the spring cylinder body 121 is in the released state, and the VI (vacuum interrupter, abbreviated as VI in the full text) is kept in the closed position; the crank arm 14 is in the initial state, the distance between the second contact 16 and the isolating contact 33 is less than the width of the isolating blade 42, and the transfer vacuum interruption branch is not connected.

[0065] Circuits in parallel, such as Figure 8 As shown, when the main switch is activated and tripped, the isolating knife 42 clamps the second contact 16 before disengaging from the isolating contact 33, and the vacuum disconnection branch is connected in parallel with the main circuit. The states of VI, crank arm 14 and spring cylinder body 121 are the same as above.

[0066] The loop transitions to VI, as follows: Figure 9 As shown, the isolating blade 42 disengages from the isolating contact 33 and clamps the second contact 16. During further opening, it pushes the crank arm 14 to rotate. The driven rod 115 in the groove 141 of the crank arm 14 moves from one end of the waist hole in the pull rod cylinder 112 to the other, releasing the pressure of the contact spring 114 on the moving end of the arc-extinguishing chamber. The arc-extinguishing chamber contacts are about to separate. The compression spring 122 inside this section of the spring cylinder body 121 begins to be pulled by the connecting rod 13.

[0067] At this point, the isolating blade 42 needs to be a certain distance from the isolating contact 33 to ensure that when the arc is interrupted by VI, there will be no breakdown and reignition between the isolating blade 42 and the isolating contact 33. This distance can be controlled by the design of the groove 141 shape.

[0068] VI has just been switched to the VI trip position, such as Figure 10 As shown, the design of the groove 141 shape change rate for the VI tripping interruption current must meet the requirements of the VI tripping speed. After the VI trips to the position, the isolating knife 42 has not yet disengaged from the second contact 16, and the groove 141 of the crank arm 14 will continue to rotate. At this time, the change of the groove 141 should not continue to increase the VI opening distance, and the VI should be kept in the open position.

[0069] From the moment VI trips to the moment the main disconnector trips, such as... Figure 11 As shown, the isolating blade 42 disengages from the second contact 16 and continues to rotate to the break position to stop; simultaneously, the crank arm 14 returns to its initial state under the action of the compression spring 122, forming an isolation break.

[0070] The time from when VI just opens to when the second contact 16 disengages from the isolating switch 42 must be longer than the maximum breaking time to ensure that the three-phase current in VI is completely interrupted. Otherwise, arcing will occur between the isolating switch 42 and the second contact 16, causing irreversible arc burn-out. This time can be controlled by adjusting the opening speed of the isolating switch 42 and by designing the spatial points of the VI just opening position and the contact disengagement position.

[0071] When isolating switch 42 is closed, such as Figure 12 As shown, when the circuit breaker is closed, the isolating blade 42 strikes the rib on the back of the cover plate 15, causing the crank arm 14 to rotate counterclockwise. The stroke of this section of the groove 141 is designed as a circular arc of equal radius to keep VI in the closed position. When the isolating blade 42 is closed and no longer presses against the cover plate 15, the crank arm 14 is reset under the push of the compression spring 122.

[0072] Because the load switch needs to complete the short-circuit current closing test of the main blade, the height of the reinforcing rib on the back of the cover plate 15 must ensure a certain safe distance to prevent a short circuit breakdown between the isolating blade 42 and the second contact 16 when the isolating blade 42 pushes the crank arm 14, which would lengthen the expected arc and cause irreversible arc burn-out.

[0073] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0075] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An environmentally friendly gas-insulated load switch with a vacuum-transfer interruption branch, characterized in that: The switch includes a transfer vacuum switching assembly (1), a grounding assembly (2), an isolation assembly (3), a rotating assembly (4), and a switch frame (5). The grounding assembly (2) and the isolation assembly (3) are respectively disposed on the switch frame (5). The rotating assembly (4) is rotatably connected to the switch frame (5) and is located between the grounding assembly (2) and the isolation assembly (3). The transfer vacuum switching assembly (1) is connected to the isolation assembly (3) and is located above the rotating assembly (4). The vacuum interruption assembly (1) includes a vacuum interrupter assembly (11), a spring cylinder assembly (12), a connecting rod (13), a crank arm (14), a cover plate (15), and a second contact (16). The crank arm (14) is configured in a limiting linkage manner on both sides of the vacuum interrupter assembly (11). One end of the connecting rod (13) is connected to both sides of the spring cylinder assembly (12), and the other end is connected to the crank arm (14). The second contact (16) is integrally formed and embedded in the cover plate (15). The cover plate (15) is connected to the crank arm (14).

2. The environmentally friendly gas-insulated load switch with a vacuum transfer disconnection branch as described in claim 1, characterized in that: The grounding assembly (2) includes a grounding bar (21), a grounding beam (22), and a grounding contact (23). The grounding beam (22) is fixed on the switch frame (5), and the grounding contact (23) is pressed onto the grounding bar (21). The grounding bar (21) is connected to the grounding beam (22) and the switch frame (5) respectively.

3. The environmentally friendly gas-insulated load switch with a transfer vacuum disconnection branch as described in claim 2, characterized in that: The isolation assembly (3) includes a busbar (31), an insulator A (32), an isolation contact (33), and an upper crossbeam (34). The isolation contact (33) is pressed onto the busbar (31). The busbar (31) is connected to one end of the insulator A (32), and the other end of the insulator A (32) is connected to the upper crossbeam (34). The upper crossbeam (34) is fixed on the switch frame (5).

4. The environmentally friendly gas-insulated load switch with a vacuum transfer disconnection branch as described in claim 3, characterized in that: The isolation contact (33) is provided with buffer pads (331) on both sides.

5. The environmentally friendly gas-insulated load switch with a transfer vacuum interruption branch as described in claim 4, characterized in that: The rotating assembly (4) includes an insulating spindle (41), an isolation blade (42), a fixed sleeve (43), an adapter rod (44), an insulator B (45), and a lower crossbeam (46). The isolation blade (42) is hinged to the adapter rod (44). The fixed sleeve (43) is connected to one end of the insulator B (45) and the adapter rod (44) is sleeved in the middle. The other end of the insulator B (45) is fixed on the lower crossbeam (46). The lower crossbeam (46) is fixed on the switch frame (5). The insulating spindle (41) is rotatably connected to the switch frame (5) on both sides and the isolation blade (42) is sleeved inside.

6. The environmentally friendly gas-insulated load switch with a vacuum transfer interruption branch as described in claim 5, characterized in that: The isolation blade (42) has a double-blade structure and is equipped with a pressure equalization sleeve at the end.

7. The environmentally friendly gas-insulated load switch with a transfer vacuum interruption branch as described in claim 6, characterized in that: The transfer vacuum interruption assembly (1) also includes a stationary end bracket (17) and a bracket A (18). The stationary end bracket (17) is fixed on the busbar (31) and has a threaded hole inside for threaded connection to the vacuum interrupter assembly (11). One end of the bracket A (18) is fixed on the busbar (31) and the other end is connected to the vacuum interrupter assembly (11).

8. The environmentally friendly gas-insulated load switch with a vacuum transfer interruption branch as described in claim 7, characterized in that: The connecting rod (13) is provided with a spring cylinder connecting hole (131), a connecting rod positioning post (132), and an inner screw (133). The spring cylinder connecting hole (131) is hinged to both sides of the spring cylinder assembly (12) by a pin and a retaining ring. The connecting rod positioning post (132) is connected to the crank arm (14). The inner screw (133) is located at the opposite end of the spring cylinder connecting hole (131) and fixes the connecting rods (13) on both sides.

9. The environmentally friendly gas-insulated load switch with a vacuum transfer interruption branch as described in claim 8, characterized in that: The crank arm (14) is provided with a groove (141), a shaft hole (142), a pin hole (143), and a through hole (144). The groove (141) is curved. The pin hole (143) is pinned to the cover plate (15) and fixed. The through hole (144) is connected to the connecting rod positioning post (132).

10. The environmentally friendly gas-insulated load switch with a transfer vacuum interruption branch as described in claim 9, characterized in that: The vacuum interrupter assembly (11) includes a vacuum interrupter body (111), a pull rod cylinder (112), a core rod (113), a contact spring (114), a driven rod (115), an end cap (116), a wire (117), a disc spring (118), and a retaining shaft (119). The vacuum interrupter body (111) is threadedly connected to the stationary end support (17). The contact spring (114) is inserted into the inner hole of the pull rod cylinder (112). The core rod (113) fits into the inner hole of the pull rod cylinder (112) and presses down on the contact spring (114). The driven rod (115) passes sequentially through the waist holes on both sides of the support A (18), the waist holes on both sides of the pull rod cylinder (112), and the round hole on the rod body of the core rod (113). The driven rod (115) is located in the groove (141) at both ends. The end cap (116) is fixed on the bracket A (18) and has a core hole. The core hole is fitted with the core rod (113) in a limiting manner. The wire (117) has O-shaped terminals at both ends. The upper end of the pull rod cylinder (112) is a stud structure. The stud structure is sequentially fitted into the disc spring (118) and the O-shaped terminal at one end of the wire (117), and screwed into the body (111) of the vacuum interrupter. The other end of the wire (117) passes through the slot on the end cap (116) and is connected to the second contact (16). The retaining shaft (119) is set on the end cap (116) and is connected to the shaft hole (142).

11. The environmentally friendly gas-insulated load switch with a transfer vacuum disconnection branch as described in claim 10, characterized in that: The spring cylinder assembly (12) includes a spring cylinder body (121), a compression spring (122), a cylinder rod (123), a plunger (124), a clip (125), and a mounting base (126). The compression spring (122) is placed inside the spring cylinder body (121). One end of the cylinder rod (123) is inserted into the spring cylinder body (121), and after passing through the compression spring (122), the stepped surface of the spring cylinder body (121) abuts against the compression spring (122). On one side, a card (125) is fitted onto the other end of the cylinder rod (123) and abuts against the other side of the compression spring (122). The plunger (124) is threadedly connected to the spring cylinder body (121) and has an opening in the middle corresponding to the cylinder rod (123). The cylinder rod (123) is connected to the connecting rod (13). The mounting seat (126) is fixed on the busbar (31), and the spring cylinder body (121) is threadedly connected to the mounting seat (126).

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