Integrated three-position disconnecting switch and installation method thereof

Abstract

The invention relates to the technical field of power distribution equipment, and discloses an integrated three-position disconnecting switch and an installation method thereof.The integrated three-position disconnecting switch comprises a switch cabinet, a cable chamber, an instrument chamber, a handcart chamber and a bus chamber are arranged in the switch cabinet, the cable chamber is located on the lower portion of the switch cabinet, and the instrument chamber is located on the lower portion of the switch cabinet; a grounding switch and a current sensor are arranged in the cable chamber, the grounding switch comprises a knife holder and a mounting seat, a first rotating shaft is rotatably connected between the inner walls of the mounting seat, and three contact knives arranged at equal intervals are arranged on the outer surface of the first rotating shaft; under the action of the electromagnet, constraint on the rotating plate can be relieved, the rotating plate can be readjusted, the situation that the rotating plate is not in place is avoided, through mutual cooperation of the electromagnet and the air storage cylinder, the balancing weight can extend outwards, the force arm is increased, and therefore the rotating plate is promoted to rotate, the contact knife can move to a proper position, and a circuit is connected.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution equipment, and particularly relates to an integrated three-position disconnector and an installation method thereof. Background Art

[0002] The existing switchgear is an electrical device. The main function of the switchgear is to switch on and off, control and protect electrical equipment during the processes of power generation, transmission, distribution, and power conversion in the power system. The components inside the switchgear mainly include circuit breakers, disconnectors, load switches, operating mechanisms, current transformers, voltage transformers, and various protection devices. There are many classification methods for switchgear. For example, according to the installation method of the circuit breaker, it can be divided into withdrawable switchgear and fixed switchgear.

[0003] A three-position disconnector cabinet for rail transit with the publication number of CN114999853A includes a cabinet body. A three-position switch, a control device, a limiting mechanism, and an operating mechanism are arranged inside the cabinet body. The three-position switch includes a closing knife head, a disconnector, and an earthing switch. The closing knife head is adapted to form an isolating position at the disconnector, the closing knife head is adapted to form an earthing position at the earthing position, and the closing knife head is adapted to form a breaking position between the disconnector and the earthing switch. The control device includes a driver, a drive shaft, and a connecting rod assembly. The connecting rod assembly connects the drive shaft and the closing knife head. The limiting mechanism is adapted to prevent the closing knife head from moving to the isolating position or the earthing position. The operating mechanism is adapted to sense the rotation stroke of the drive shaft to control the driver.

[0004] A high-voltage switchgear with the publication number of CN117791385B belongs to the technical field of switchgear. It includes a cabinet body. A first housing is fixedly connected to the outer side wall of the switchgear. A condensing pipe is arranged inside the first housing. Opposite ends of the condensing pipe are respectively fixedly connected to opposite inner walls of the first housing. A conveying device for conveying cold water into the condensing pipe is arranged at the first housing. A first through opening is formed in the switchgear close to the first housing. The switchgear is communicated with the first housing at the first through opening. A first exhaust fan is installed in the first through opening of the switchgear. A rotating assembly for driving the first exhaust fan to rotate is arranged at the condensing pipe.

[0005] Based on the above solution, a switch is required to cut off and connect the power when the switchgear is in use. However, for safety reasons, most switches are set inside the cabinet body, and the accurate state of the switch cannot be directly observed. When the contact blade is moved by an external control rod, various situations may occur. When the rotation angle is less than 90 degrees, the contact may not be achieved, resulting in a leakage situation. When the rotation angle is greater than 90 degrees, an offside situation will occur and the closure cannot be performed either. When the rotation angle is close to 90 degrees, since a reset device is provided for convenience of disconnection, if it is not fixed thoroughly at this time, the contact blade will retract, causing a certain misalignment between the contact blade and the tool holder and affecting the circuit transmission. Summary of the Invention

[0006] The purpose of the present invention is to provide an integrated three-position disconnector and its installation method to solve the problems raised in the above background technology.

[0007] To achieve the above purpose, the present invention provides the following technical solution: An integrated three-position disconnector includes a switchgear, and a cable chamber, an instrument chamber, a handcart chamber and a bus chamber are respectively arranged inside the switchgear, and the cable chamber is located at the lower part of the switchgear; A grounding switch and a current sensor are respectively arranged inside the cable chamber. The grounding switch includes a tool holder and a mounting seat. A first rotating shaft is rotatably connected between the inner walls of the mounting seat. Three equally spaced contact blades are arranged on the outer surface of the first rotating shaft. An adjusting assembly is arranged on the right part of the outer surface of the first rotating shaft. A limiting ring is arranged on the right side wall of the mounting seat, and the limiting ring and the first rotating shaft are concentric. A group of circularly arranged card slots are opened on the inner wall of the limiting ring; Preferably, the adjusting assembly includes a rotating plate. A first cavity and a second cavity are respectively opened inside the rotating plate. A limiting plate is slidably connected inside the first cavity. An electromagnet is arranged on the inner bottom wall of the first cavity. A first pressing plate capable of sliding left and right is arranged inside the second cavity. An air bag is arranged on the inner bottom wall of the second cavity. A group of equally spaced air supply pipes are arranged on the upper surface of the air bag. The right side surface of the air bag is communicated with a gas blocking pipe, and the right end of the gas blocking pipe penetrates through the rotating plate. A distance sensor is arranged on the left side wall of the second cavity.

[0008] The adjusting assembly can automatically adjust the position of the contact blade so that the contact blade is finally at 90 degrees with the tool holder, achieving the purpose of connecting the circuit and avoiding the situations of being not in place or crossing the boundary.

[0009] Preferably, the air blocking pipe includes a through pipe, with a first air collecting ring and a second air collecting ring respectively provided at both ends of the through pipe. The inner diameter of the first air collecting ring gradually decreases from left to right along the axial direction, and the inner diameter of the second air collecting ring gradually increases from left to right along the axial direction. A limiting rod is inserted into the left side surface of the air bag, and the right end of the limiting rod extends into the interior of the air blocking pipe. The left end of the limiting rod is fixedly connected to the outer surface of the first pressing plate.

[0010] Preferably, two symmetrically arranged air storage cylinders are provided on the right side surface of the rotating plate. An air inlet pipe is provided at the lower end of each air storage cylinder, and the lower end of each air inlet pipe is communicated with the air blocking pipe. A push rod is slidably connected inside each air storage cylinder, and a counterweight block is provided at the upper ends of the two push rods.

[0011] Preferably, two symmetrically arranged through grooves are formed on the left side surface of the rotating plate. A guiding block and a second pressing plate are respectively slidably connected inside each through groove. The two guiding blocks are fixedly connected to the first pressing plate, and two symmetrically arranged springs are provided between each second pressing plate and the second cavity.

[0012] Preferably, a first bevel gear is provided at the left end of the first rotating shaft. A control shaft is provided on the front wall of the cable chamber, and the front end of the control shaft penetrates through the cable chamber. A second bevel gear is provided at the rear end of the control shaft, and the first bevel gear meshes with the second bevel gear. A second rotating shaft is fixedly connected between the inner walls of the mounting seat. A group of equally spaced first fixing blocks are rotatably connected to the outer surface of the second rotating shaft. A second fixing block is hinged to the outer surface of each contact blade, and a spring is provided between each group of second fixing blocks and the first fixing blocks.

[0013] Preferably, a group of equally spaced first conductive plates are provided on the front surface of the current sensor. A line lightning arrester and a grounding main bus are respectively provided at the lower ends of the first conductive plates. A group of equally spaced second conductive plates are provided on the upper surface of the current sensor. A first electrical interface is provided on the front surface of each second conductive plate, and the first electrical interface penetrates through the cable chamber. A knife seat is provided on the front surface of each first conductive plate, and the knife seat corresponds to the contact blade.

[0014] Preferably, both the bus chamber and the instrument chamber are arranged above the cable chamber. A group of equally spaced third conductive plates are provided inside the bus chamber, and the lower ends of the third conductive plates penetrate through the bus chamber. A second electrical interface is provided on the front surface of each third conductive plate. A microcomputer protection device is provided inside the instrument chamber.

[0015] Preferably, the handcart room is arranged in the front of the cable room. A circuit breaker is slidably connected inside the handcart room, and the circuit breaker is electrically connected to the microcomputer protection device. A group of busbar contacts and outgoing line contacts arranged at equal distances are respectively provided on the back of the circuit breaker. The busbar contacts extend into the second electrical interface, and the outgoing line contacts extend into the second electrical interface.

[0016] The present invention also provides an installation method for the integrated three-position disconnector, and the specific operation method steps are as follows: Step 1: Draw BIM drawings according to the construction drawings and conduct online simulation; Step 2: According to the on-site conditions, conduct on-site confirmation, label pasting, and mark the positions of the base anchor bolts, then carry out drilling and installation. After the installation is completed, level the base, measure the base with a level, and ensure that the height difference is within 2 mm; Step 3: After the base is leveled, drill holes and fix the wire trough according to the position of the base and the wall. Transport the switchgear to the designated position by a rail car, hoist the switchgear onto the base by a hand-operated hoist, and fix it with connecting bolts; Step 4: After the switchgear is installed, conduct cable laying. Lay it according to the predetermined path and fix it with cable fixing clips. The cables are arranged in parallel, neatly, beautifully, and naturally, easy to identify, and cannot be overlapped; the first conductive plate, the second conductive plate, and the third conductive plate are installed neatly, firmly, and reliably, and are arranged evenly and reasonably. At the corners with cable fixing clips, an insulating gasket should be added between the cable and the wall to avoid damaging the cable insulation layer; Step 5: After the cables are fixed, use a crimping pliers to crimp the 185-type copper terminal on the cable end. The crimping torque meets the standards and design requirements. Then use a heat shrinkable tube for protection, fix it with a blowtorch, and finally install it at the busbar electrical connection clamp and the copper busbar inside the cabinet; Step 6: After the terminal is installed, install the earthing flat steel. Connect each cable fixing clip with the earthing flat steel. Use a special bender to bend the flat steel at the turning point. Connect the overlapping part of the two flat steels with four M10 bolts, all meeting the standards and design requirements. Finally, connect the earthing flat steel with the copper-clad steel of the substation support with a soft copper stranded wire, and connect the shell of the switchgear with the copper-clad steel of the substation support with a 150 mm cable to ensure the grounding continuity; Step 7: Clean the site and remove the materials.

[0017] The technical effects of the present invention: 1. The present invention can use a distance sensor to detect the distance between the first pressing plate and the distance sensor in real time. The greater the distance between the two, the larger the rotation angle of the contact knife at this time, and vice versa. Therefore, the position of the contact knife can be reflected according to the distance, and then the adjustment component can be used to select an appropriate method to correct it, avoiding misalignment.

[0018] 2. Under the action of the electromagnet, the present invention can release the constraint on the rotating plate, enabling the rotating plate to be readjusted to avoid incomplete positioning. Through the mutual cooperation of the electromagnet and the air storage cylinder, the counterweight can extend outward, increasing the force arm, thereby promoting the rotation of the rotating plate, enabling the contact knife to move to an appropriate position, and making the circuit connected.

[0019] 3. Through the mutual cooperation of the first pressing plate and the air blocking pipe, the present invention can make the limiting plate gradually extend outward after moving to an appropriate position, insert it into the card slot, and fix it to avoid retraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 is a schematic diagram of the mounting seat structure of the present invention; Figure 4 is a schematic diagram of the cross-sectional structure of the limiting ring of the present invention; Figure 5 is a schematic diagram of the cross-sectional structure of the rotating plate of the present invention; Figure 6 is a schematic diagram of the rotating plate structure of the present invention; Figure 7 is a schematic diagram of the cross-sectional structure of the air bag of the present invention; Figure 8 is a schematic diagram of the circuit breaker structure of the present invention.

[0021] In the figure: 1, switchgear cabinet; 2, cable chamber; 3, instrument chamber; 4, handcart chamber; 5, earthing switch; 501, knife seat; 502, mounting seat; 503, first rotating shaft; 504, contact blade; 505, limiting ring; 506, clamping groove; 6, current sensor; 7, adjustment assembly; 701, rotating plate; 702, first cavity; 703, second cavity; 704, limiting plate; 705, electromagnet; 706, first pressing plate; 707, air bag; 708, air supply pipe; 8, air blocking pipe; 801, through pipe; 802, first air collecting ring; 803, second air collecting ring; 9, limiting rod; 10, air storage cylinder; 11, air inlet pipe; 12, push rod; 13, counterweight; 14, through groove; 15, guiding block; 16, second pressing plate; 17, first bevel gear; 18, control shaft; 19, second bevel gear; 20, second rotating shaft; 21, first fixing block; 22, second fixing block; 23, first conductive plate; 24, line arrester; 25, main earthing busbar; 26, second conductive plate; 27, first electrical interface; 28, busbar chamber; 29, third conductive plate; 30, second electrical interface; 31, microcomputer protection device; 32, circuit breaker; 33, busbar contact; 34, outgoing line contact. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] First embodiment The present invention provides an integrated three-position disconnecting switch as Figures 1 to 8 shown, which includes a switchgear cabinet 1. Inside the switchgear cabinet 1, there are respectively provided a cable chamber 2, an instrument chamber 3, a handcart chamber 4, and a busbar chamber 28. The cable chamber 2 is located at the lower part of the switchgear cabinet 1. The cable chamber 2 is used to connect external cables, usually the cable connection points for entering and leaving the switchgear cabinet 1, and the cable chamber 2 is located at the lower part for easy connection with the ground wire.

[0024] Inside the cable chamber 2, a grounding switch 5 and a current sensor 6 are respectively provided. The grounding switch 5 includes a knife seat 501 and a mounting seat 502. A first rotating shaft 503 is rotatably connected between the inner walls of the mounting seat 502. Three equally spaced contact blades 504 are provided on the outer surface of the first rotating shaft 503. The contact blades 504 can rotate with the first rotating shaft 503 to make the contact blades 504 contact or separate from the knife seat 501, achieving the purpose of connecting or disconnecting the circuit. An adjustment assembly 7 is provided on the right part of the outer surface of the first rotating shaft 503. The adjustment assembly 7 can automatically adjust the position of the contact blade 504 so that the contact blade 504 is finally at a 90-degree angle with the knife seat 501, achieving the purpose of connecting the circuit and avoiding the situation of being out of position or overstepping. A limiting ring 505 is provided on the right side wall of the mounting seat 502, and the limiting ring 505 is concentric with the first rotating shaft 503. A group of circumferentially arranged card slots 506 are opened on the inner wall of the limiting ring 505. Under the constraint of the card slots 506, the position of the adjustment assembly 7 can be effectively constrained to avoid the situation of the adjustment assembly 7 retracting.

[0025] The adjustment component 7 includes a rotating plate 701. Inside the rotating plate 701, a first cavity 702 and a second cavity 703 are respectively formed. A certain gas is filled inside the first cavity 702, which can make the limiting plate 704 extend outwards. When restricted, it can make the limiting plate 704 contract towards the inside of the first cavity 702, and at the same time compress the gas inside the first cavity 702. When the restraint force disappears, under the action of air pressure, it can make the limiting plate 704 quickly reset to achieve the purpose of clamping and limiting, avoiding the situation of retraction. The limiting plate 704 is slidably connected inside the first cavity 702. The limiting plate 704 is made of metal and can be attracted by the electromagnet 705. The right side surface of the limiting plate 704 is arc-shaped to prevent jamming. The inner bottom wall of the first cavity 702 is provided with an electromagnet 705. When the electromagnet 705 is energized, it can generate a magnetic suction force to attract the limiting plate 704 and the second pressing plate 16, making the two approach the electromagnet 705 to achieve the purpose of freely adjusting the positions of the limiting plate 704 and the second pressing plate 16. Inside the second cavity 703, there is a first pressing plate 706 that can slide left and right. When the rotation angle of the rotating plate 701 continuously increases, the inclination angle of the first pressing plate 706 gradually increases, making the first pressing plate 706 gradually move to the right to compress the air bag 707. The inner bottom wall of the second cavity 703 is provided with an air bag 707. The upper surface of the air bag 707 is provided with a group of air supply pipes 708 arranged at equal intervals. The right side surface of the air bag 707 is communicated with a gas blocking pipe 8, and the right end of the gas blocking pipe 8 penetrates through the rotating plate 701. A distance sensor is provided on the left side wall of the second cavity 703. The distance sensor can detect the distance between the first pressing plate 706 and the distance sensor in real time. The greater the distance between the two, the greater the rotation angle of the touch knife 504 at this time, and vice versa. Thus, the position of the touch knife 504 can be reflected according to the distance, and then the adjustment component 7 can be used to select an appropriate method to straighten it to avoid misalignment.

[0026] The gas blocking pipe 8 includes a through pipe 801. At both ends of the through pipe 801, a first air gathering ring 802 and a second air gathering ring 803 are respectively provided. The inner diameter of the first air gathering ring 802 gradually decreases from left to right along the axial direction, and the inner diameter of the second air gathering ring 803 gradually increases from left to right along the axial direction. The left side surface of the air bag 707 is inserted with a limiting rod 9, and the right end of the limiting rod 9 extends into the inside of the gas blocking pipe 8. Through the cooperation of the limiting rod 9 and the gas blocking pipe 8, the gas blocking pipe 8 can be opened or closed according to the actual situation. The left end of the limiting rod 9 is fixedly connected to the outer surface of the first pressing plate 706.

[0027] On the right side of the rotating plate 701, there are two symmetrically arranged air storage cylinders 10. At the lower end of each air storage cylinder 10, there is an air inlet pipe 11. The lower end of each air inlet pipe 11 is connected to the air blocking pipe 8. Inside each air storage cylinder 10, there is a push rod 12 slidably connected. At the upper ends of the two push rods 12, there is a counterweight 13. When the air blocking pipe 8 is opened, gas enters the inside of the air storage cylinder 10 through the air blocking pipe 8, causing the gas inside the air storage cylinder 10 to gradually increase. Under the action of air pressure, the counterweight 13 is pushed outward by the push rod 12, moving it away from the first rotating shaft 503. Since the position of the counterweight 13 is changed, the force arm increases, causing the rotating plate 701 to move again, avoiding the situation of incomplete contact.

[0028] On the left side of the rotating plate 701, there are two symmetrically arranged through slots 14. Inside each through slot 14, a guiding block 15 and a second pressing plate 16 are respectively slidably connected. The second pressing plate 16 is made of metal and can be attracted by the electromagnet 705, causing the two second pressing plates 16 to move away from the first pressing plate 706. By reducing the friction between the two, the first pressing plate 706 can slide more easily to the right. The two guiding blocks 15 are fixedly connected to the first pressing plate 706. The guiding blocks 15 play a certain constraining role, enabling the first pressing plate 706 to move along a specified trajectory. Between each second pressing plate 16 and the second cavity 703, there are two symmetrically arranged springs. Under the action of the springs, the second pressing plate 16 contacts the first pressing plate 706, increasing the friction coefficient between the two and avoiding the situation of sliding as soon as it starts to tilt.

[0029] At the left end of the first rotating shaft 503, there is a first bevel gear 17. On the front wall of the cable chamber 2, there is a control shaft 18, and the front end of the control shaft 18 penetrates the cable chamber 2. At the rear end of the control shaft 18, there is a second bevel gear 19, and the first bevel gear 17 meshes with the second bevel gear 19. Between the inner walls of the mounting seat 502, there is a second rotating shaft 20 fixedly connected. On the outer surface of the second rotating shaft 20, there is a group of equally spaced first fixing blocks 21 rotatably connected. On the outer surface of each contact blade 504, there is a second fixing block 22 hinged. Between each group of second fixing blocks 22 and the first fixing blocks 21, there are springs. With the mutual cooperation of the springs, the second fixing blocks 22 and the first fixing blocks 21, the contact blade 504 can be quickly reset to achieve the purpose of disconnection. On the front surface of the current sensor 6, there is a group of equally spaced first conductive plates 23. At the lower ends of the first conductive plates 23, there are respectively a line lightning arrester 24 and a grounding main bus 25. On the upper surface of the current sensor 6, there is a group of equally spaced second conductive plates 26. On the front surface of each second conductive plate 26, there is a first electrical interface 27, and the first electrical interface 27 penetrates the cable chamber 2. On the front surface of each first conductive plate 23, there is a knife holder 501, and the knife holder 501 corresponds to the contact blade 504.

[0030] The busbar chamber 28 and the instrument chamber 3 are both arranged above the cable chamber 2. The busbar chamber 28 is used to connect and distribute high-voltage or low-voltage busbars in the power system. The busbar chamber 28 usually contains main busbars and branch busbars and can also transmit electric energy from one power source point to multiple load points. The instrument chamber 3 is used to install various measuring and indicating instruments such as voltmeters, ammeters, wattmeters, etc., and can also monitor and control the operating state of the power system and provide necessary operation signals. A group of third conductive plates 29 arranged at equal distances are provided inside the busbar chamber 28, and the lower ends of the third conductive plates 29 penetrate the busbar chamber 28. A second electrical interface 30 is provided on the front of each third conductive plate 29. A microcomputer protection device 31 is provided inside the instrument chamber 3. The handcart chamber 4 is arranged on the front of the cable chamber 2. The handcart chamber 4 is used to install a movable handcart. The handcart can be conveniently pushed into and pulled out of the switch cabinet 1, and at the same time, the operation safety is improved because when the handcart is in the pulled-out state, it can ensure that the operator keeps a safe distance from the live part. A circuit breaker 32 is slidably connected inside the handcart chamber 4, and the circuit breaker 32 is electrically connected to the microcomputer protection device 31. A group of busbar contacts 33 and outgoing line contacts 34 arranged at equal distances are respectively provided on the back of the circuit breaker 32. The busbar contacts 33 extend into the second electrical interface 30, and the outgoing line contacts 34 extend into the second electrical interface 30.

[0031] During actual use, manually rotate the control shaft 18 to drive the second bevel gear 19 at the rear end to rotate. Under the action of meshing, the first bevel gear 17 drives the first rotating shaft 503 to rotate, so that each contact blade 504 rotates along the first rotating shaft 503 to achieve the purpose of closing the switch.

[0032] When the detected value of the distance sensor is lower than the threshold value, it indicates that the contact blade 504 fails to move to the specified position at this time, and the following adjustments are required: At this time, the rotating plate 701 is in an inclined state. The electromagnet 705 is activated to generate a magnetic suction force. Under the action of the magnetic suction force, each first pressing plate 706 and the limiting plate 704 are respectively moved closer to the position of the electromagnet 705. When the limiting plate 704 moves downward gradually under the magnetic suction force, under the action of extrusion, the gas inside the first cavity 702 passes through the air supply pipe 708, successively passes through the air bag 707 and the air blocking pipe 8, and enters the inside of the air storage cylinder 10, causing the gas inside the air storage cylinder 10 to gradually increase. Under the action of air pressure, the counterweight 13 is pushed outward by the push rod 12, making it move away from the first rotating shaft 503. Since the position of the counterweight 13 is changed, the force arm is increased, causing the rotating plate 701 to move again, so that the cutting tool 504 can contact the tool holder 501. At the same time, when the second pressing plate 16 moves away from the first pressing plate 706, the friction between the two is reduced, increasing the sliding distance of the first pressing plate 706 to the right, increasing the extrusion force on the air bag 707, and causing the gas inside the air bag 707 to also enter the two air storage cylinders 10 through the air blocking pipe 8, increasing the internal gas again. Under the action of the push rod 12, the extending distance of the counterweight 13 outward is increased again. Since the position of the counterweight 13 is changed, the force arm is increased, causing the rotating plate 701 to move again, making the cutting tool and the tool holder 501 form a 90-degree angle, avoiding the situation of dislocation.

[0033] When the detected value of the distance sensor gradually approaches the threshold value, it indicates that the cutting tool 504 is about to move to the specified position at this time. At this time, the moving distance of the first pressing plate 706 according to gravity gradually reaches the maximum, driving the limiting rod 9 to gradually move into the through pipe 801. Since the inner diameter of the first air gathering ring 802 gradually decreases from left to right along the axial direction, when it moves to a certain extent, the air blocking pipe 8 can be closed, causing the subsequent gas squeezed by the air bag 707 to enter the first cavity 702. Under the action of air pressure, the limiting plate 704 extends outward into the clamping groove 506 to achieve the purpose of limiting and fixing.

[0034] When the detected value of the distance sensor is greater than the threshold value, it indicates that the cutting tool 504 has moved beyond the tool holder 501 at this time. The following adjustments need to be made: At this time, the rotating plate 701 tilts again. Under the action of gravity, the counterweight 13 gradually moves downward. Under the action of the push rod 12, a negative pressure is generated inside the air storage cylinder 10. Under the action of the negative pressure, the limit rod 9 extends again along the trajectory of the air blocking pipe 8 to the position of the second air gathering ring 803. Since the inner diameter of the second air gathering ring 803 gradually increases from left to right along the axial direction, the gas entering the inside of the air storage cylinder 10 increases, and the air inside the first cavity 702 is evacuated. The limit plate 704 contracts toward the inside of the first cavity 702 to release the limit. Since the rotation angle of the rotating plate 701 is greater than 90 degrees at this time, the tensile force of the spring is greater than the gravity of the rotating plate 701 at this time. Under the action of elasticity, the contact blade 504 can be pulled back to the specified position and fixed again.

[0035] Second Embodiment The present invention also provides an installation method for an integrated three-position disconnect switch. The specific operation method steps are as follows: Step 1: Draw BIM drawings according to the construction drawings and conduct online simulations.

[0036] Step 2: According to the on-site conditions, conduct on-site confirmation, label pasting, and marking of the base anchor bolt positions. Then, drill holes for installation. After installation, level the base. Use a level to measure the base to ensure that the height difference is within 2 mm.

[0037] Step 3: After the base is leveled, drill holes and fix the wire trough according to the position of the base and the wall. Transport the switchgear 1 to the designated position by a rail vehicle, hoist the switchgear 1 onto the base using a manual hoist, and fix it with connecting bolts.

[0038] Step 4: After the switchgear 1 is installed, lay the cables. Lay them according to the predetermined path and fix them with cable fixing clips. The cables are arranged parallel, neatly, beautifully, and naturally, and are easy to identify. They cannot be overlapped. The first conductive plate 23, the second conductive plate 26, and the third conductive plate 29 are installed neatly, firmly, and reliably, and are arranged evenly and reasonably. At the corners with cable fixing clips, an insulating gasket should be added between the cable and the wall to avoid damaging the cable insulation layer.

[0039] Step 5: After the cables are fixed, use a crimping tool to crimp the 185-type copper terminal to the cable end. The crimping torque meets the standards and design requirements. Then, use a heat shrinkable tube for protection, fix it with a blowtorch, and finally install it at the busbar electrical connection clamp and the copper busbar inside the cabinet.

[0040] Step 6: After the terminal blocks are installed, install the earthing flat steel. Connect each cable fixing clamp with the earthing flat steel. Use a special bending tool to bend the flat steel at the turning point. Connect the overlapping parts of two flat steels with four M10 bolts, all meeting the standards and design requirements. Finally, connect the earthing flat steel with the copper-clad steel of the substation support using soft copper stranded wire, and connect the shell of switchgear 1 with the copper-clad steel of the substation support using a 150 mm cable to ensure the continuity of earthing.

[0041] Step 7: Clean up the site and remove the materials.

[0042] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated three-position isolating switch, comprising a switch cabinet (1), characterized in that: The switch cabinet (1) is provided with a cable room (2), an instrument room (3), a trolley room (4) and a busbar room (28) respectively, wherein the cable room (2) is located at the lower part of the switch cabinet (1); The cable chamber (2) is provided with a grounding switch (5) and a current sensor (6) respectively. The grounding switch (5) comprises a knife seat (501) and a mounting seat (502). A first rotating shaft (503) is rotatably connected between the inner walls of the mounting seat (502). The outer surface of the first rotating shaft (503) is provided with three contact knives (504) arranged at equal distances. An adjustment component (7) is provided on the right part of the outer surface of the first rotating shaft (503). A limit ring (505) is provided on the right side wall of the mounting seat (502). The limit ring (505) and the first rotating shaft (503) are concentric. The inner wall of the limit ring (505) is provided with a group of circumferentially arranged slots (506).

2. The integrated three-position isolating switch according to claim 1, characterized in that: The adjustment assembly (7) comprises a rotating plate (701), wherein a first cavity (702) and a second cavity (703) are respectively provided inside the rotating plate (701), wherein the first cavity (702) is slidably connected to a limit plate (704), wherein an electromagnet (705) is provided on the inner bottom wall of the first cavity (702), wherein a first extrusion plate (706) capable of sliding left and right is provided inside the second cavity (703), wherein an air bag (707) is provided on the inner bottom wall of the second cavity (703), wherein a group of air supply pipes (708) arranged at equal distances are provided on the upper surface of the air bag (707), wherein the right side surface of the air bag (707) is connected to an air blocking pipe (8), wherein the right end of the air blocking pipe (8) passes through the rotating plate (701), and wherein a distance sensor is provided on the left side wall of the second cavity (703).

3. The integrated three-position isolating switch according to claim 2, characterized in that: The air blocking tube (8) comprises a through tube (801), and a first air gathering ring (802) and a second air gathering ring (803) are respectively provided at both ends of the through tube (801), the inner diameter of the first air gathering ring (802) gradually decreases from left to right along the axial direction, and the inner diameter of the second air gathering ring (803) gradually increases from left to right along the axial direction, and a limiting rod (9) is inserted into the left side of the air bag (707), and the right end of the limiting rod (9) extends to the inside of the air blocking tube (8), and the left end of the limiting rod (9) is fixedly connected to the outer surface of the first extrusion plate (706).

4. The integrated three-position isolating switch according to claim 2, characterized in that: Two symmetrical air cylinders (10) are provided on the right side of the rotating plate (701), each of the air cylinders (10) is provided with an air inlet pipe (11) at the lower end, the lower end of each air inlet pipe (11) is connected to the air blocking pipe (8), and a push rod (12) is slidably connected inside each of the air cylinders (10), and a counterweight (13) is provided at the upper end of the two push rods (12).

5. The integrated three-position isolating switch according to claim 2, characterized in that: The left side of the rotating plate (701) is provided with two symmetrical through grooves (14), each through groove (14) is slidably connected to a guide block (15) and a second extrusion plate (16), the two guide blocks (15) and the first extrusion plate (706) are fixedly connected, and two symmetrical springs are provided between each of the second extrusion plates (16) and the second cavity (703).

6. The integrated three-position isolating switch according to claim 1, characterized in that: A first bevel gear (17) is provided at the left end of the first rotating shaft (503), a control shaft (18) is provided on the front wall of the cable chamber (2), and the front end of the control shaft (18) passes through the cable chamber (2), a second bevel gear (19) is provided at the rear end of the control shaft (18), and the first bevel gear (17) and the second bevel gear (19) are meshed with each other, a second rotating shaft (20) is fixedly connected between the inner walls of the mounting seat (502), a group of first fixed blocks (21) arranged at equal distances are rotatably connected to the outer surface of the second rotating shaft (20), a second fixed block (22) is hingedly connected to the outer surface of each contact knife (504), and a spring is provided between each group of second fixed blocks (22) and the first fixed block (21).

7. The integrated three-position isolating switch according to claim 1, characterized in that: A group of first conductive plates (23) arranged at equal distances are provided on the front of the current sensor (6), and a line lightning arrester (24) and a grounding main busbar (25) are provided at the lower ends of the first conductive plates (23). A group of second conductive plates (26) arranged at equal distances are provided on the upper surface of the current sensor (6), and a first electrical interface (27) is provided on the front of each second conductive plate (26), and the first electrical interface (27) runs through the cable chamber (2). A knife seat (501) is provided on the front of each first conductive plate (23), and the knife seat (501) corresponds to the contact knife (504).

8. The integrated three-position isolating switch according to claim 7, characterized in that: The busbar chamber (28) and the instrument chamber (3) are both arranged on the upper part of the cable chamber (2); a group of third conductive plates (29) arranged at equal distances are provided inside the busbar chamber (28); the lower ends of the third conductive plates (29) penetrate the busbar chamber (28); a second electrical interface (30) is provided on the front side of each third conductive plate (29); and a microcomputer protection device (31) is provided inside the instrument chamber (3).

9. The integrated three-position isolating switch according to claim 8, characterized in that: The trolley chamber (4) is arranged on the front side of the cable chamber (2); a circuit breaker (32) is slidably connected inside the trolley chamber (4); the circuit breaker (32) and the microcomputer protection device (31) are electrically connected; a group of bus contacts (33) and outgoing line contacts (34) arranged at equal distances are respectively provided on the back side of the circuit breaker (32); the bus contacts (33) extend into the interior of the second electrical interface (30); and the outgoing line contacts (34) extend into the interior of the second electrical interface (30).

10. A method for installing the integrated three-position isolating switch according to claim 8, characterized in that: The steps include: Step 1: Draw BIM drawings according to construction drawings and conduct online simulation; Step 2: According to the site conditions, conduct on-site confirmation, label affixation and base anchor bolt position marking, then perform drilling and installation. After installation, level the base and use a level to measure the base to ensure that the height difference is within 2mm; Step 3: After the base is leveled, holes are drilled and the cable ducts are fixed according to the positions of the base and the wall. The switch cabinet (1) is transported to the designated position by a rail vehicle, and the switch cabinet (1) is hoisted onto the base by a hand hoist and fixed with connecting bolts; Step 4: After the switch cabinet (1) is installed, the cables are laid according to a predetermined path and fixed with cable fixing clips. The cables are arranged in parallel and neatly, which is beautiful and natural, easy to identify, and cannot be overlapped. The first conductive plate (23), the second conductive plate (26), and the third conductive plate (29) are installed neatly, firmly, reliably, and evenly and reasonably. Insulating pads should be added between the cables and the wall at the corners where the cable fixing clips are located to avoid damaging the cable insulation layer. Step 5. After the cables are fixed, use crimping pliers to crimp the 185-type copper terminal to the cable end. The crimping torque meets the standards and design requirements. Then use heat shrink tubing for protection and fix it with a flamethrower. Finally, install it on the busbar electrical connection clamp and the copper busbar in the cabinet. Step 6: After the terminal block is installed, install the grounding flat steel. Connect each cable fixing card with the grounding flat steel. Use a special bender to bend the flat steel at the bend. Use four M10 bolts to connect the two flat steel overlaps. All meet the standards and design requirements. Finally, use soft copper stranded wire to connect the grounding flat steel to the copper-clad steel of the transformer bracket. Use a 150mm cable to connect the shell of the switch cabinet (1) to the copper-clad steel of the transformer bracket to ensure grounding continuity. Step 7: Clean up the site and remove materials.

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