GIS Current Transformer Overall Disassembly and Assembly Device and Disassembly and Assembly Method

Abstract

GIS Current Transformer Overall Disassembly and Assembly Device and Disassembly Method. The device has the functions of overall hoisting and transportation of the current transformer CT. After the current transformer CT is hoisted, it seamlessly connects and directly lands on the current transformer CT transporter. During the process of flange docking for reinstalling the current transformer CT, the position of the current transformer CT can be flexibly adjusted to facilitate precise flange docking. The structure of this device is simple, compact and stable, and it can be flexibly disassembled, assembled and adjusted in the narrow space between GIS devices, avoiding obstacles such as cable trough boxes and electrical equipment arranged at the bottom and on both sides of the GIS, reducing the disassembly workload of the GIS and its auxiliary equipment, being easy to operate with less effort, improving the accuracy and installation quality of flange docking for reinstalling the current transformer CT, improving the operation efficiency, and reducing the safety risks during the hoisting process of the current transformer CT.

Description

Technical Field

[0001] The present invention relates to the field of transformation of power system transmission and substation engineering, and particularly relates to an integral disassembly and assembly device and method for a GIS current transformer. Background Art

[0002] For GIS (Gas Insulated Metal Enclosed Switchgear) with a voltage level of 550 kV or above, a horizontal circuit breaker layout is often selected, and the current transformer CT is horizontally installed at both ends of the circuit breaker's incoming and outgoing lines, and the connection part is a rigid flange connection. When the current transformer CT needs to be replaced as a whole due to internal faults or equipment capacity expansion and transformation, due to the compact structure of GIS, the narrow space in the plant, and the cable trough boxes and electrical equipment arranged at the bottom and both sides of GIS, there is currently no special operation equipment, and it is also impossible to use large-volume automated machinery such as forklifts for operation.

[0003] The existing common construction method is to set up a scaffolding maintenance platform from the ground as the construction operation platform for the disassembly and assembly of the current transformer CT, use the hook of the indoor bridge crane or the gantry hanger in the GIS as the lifting point for the current transformer CT, and use conventional lifting tools such as chain hoists and slings for lifting and manual auxiliary handling to disassemble and assemble the current transformer CT. Since the lifting point is generally not directly above the current transformer CT and it is impossible to lift the current transformer CT and move it smoothly, during the lifting process of the current transformer CT, operators need to adjust the position of the current transformer CT at any time and assist in keeping the movement of the current transformer CT stable. Especially when reinstalling the butt flange connection surface of the current transformer CT, it is impossible to provide a high butt accuracy, and it takes a lot of time and effort for manual adjustment. Using the conventional construction method has a large amount of construction work, a long construction period, great operation difficulty, and high safety and quality risks.

[0004] There are also devices for disassembling and assembling current transformers in the prior art. For example, Chinese Patent Document CN107658770A discloses a disassembly and assembly platform for a switchgear current transformer, including a lifting platform, a tray arm arranged on the lifting platform

[0005] a sleeve wrench arranged on the tray arm, a motor arranged on the tray arm and in transmission connection with the sleeve wrench, and a camera arranged on the tray arm on one side of the sleeve wrench. The single-arm structure of its tray has the defect of low lifting rigid load, and it is only suitable for the disassembly and assembly of current transformers with a low voltage level.

[0006] Chinese Patent Document CN 209668655U discloses a current transformer lifting tool, including a kit for installing on the fixed rod of the current transformer and a support arm connected to the side of the kit; a sling hole for installing a sling is arranged at the end of the support arm far from the kit. This lifting tool occupies a large space and is not suitable for use in scenarios with a high density of components such as GIS devices. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an overall disassembly and assembly device and method for GIS current transformers, which can provide a tool with a simple structure and convenient operation to achieve accurate, reliable hoisting, stable movement and transportation of the current transformer CT as a whole, improve the operation efficiency, operation quality and safety factor of the overall disassembly and assembly of the CT, and reduce the labor intensity of the operators.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0009] The overall disassembly and assembly device for GIS current transformers includes two gantry hoist brackets. There is an I-beam track between the two gantry hoist brackets. A hand-push trolley matching the "I" shape of the I-beam track is provided on the I-beam track. A chain block is provided below the hand-push trolley, and a current transformer CT sling is detachably connected below the chain block. The combination of the chain block and the current transformer CT sling can be used to lift and lower the current transformer CT body, and the hand-push trolley can be used to transfer the lifted current transformer CT body.

[0010] The structure of the above-mentioned hand-push trolley is as follows: Two sliding wheels matching the "I" shape are provided on each I-beam track. Each sliding wheel is composed of two rollers on both sides of the "I" shape. The two rollers are connected by bolts below, and the chain block is connected below the bolts. An axial connection limiting plate is provided between the sliding wheels. Through the cooperation of the rollers and the I-beam track, the load below can move along the "I" beam track.

[0011] The structure of the above-mentioned current transformer CT sling is as follows: The current transformer CT sling is composed of two CT bearing plates combined. A groove matching the bottom size of the current transformer CT is provided at the middle position of the CT bearing plate combination. A connecting fixing plate is provided between the two CT bearing plates. Hoisting ring bolts are provided at both ends of the CT bearing plate. The current transformer CT sling can be detachably connected to the chain block above through shackles and hoisting ring bolts. The weight of the current transformer CT body can be steadily placed on the current transformer CT sling through the groove of the CT bearing plate.

[0012] The above-mentioned gantry hoist bracket is provided with two assembly brackets. The bottoms of the two gantry hoist brackets are connected and fixed by a horizontal tensioning rib plate connecting the assembly brackets. The horizontal tensioning rib plate can make the whole device have better rigidity and mobility.

[0013] Between the two assembly brackets at one end of the above-mentioned gantry crane support, there are two horizontal prefabricated cross beams and second prefabricated diagonal tension rib plates arranged staggeredly. Between the I-beam track and the assembly bracket at this end, there is a first prefabricated diagonal tension rib plate. At the lower end of the assembly bracket, there is a height-adjustable support leg. The prefabricated cross beam and the prefabricated diagonal tension rib plate strengthen the structural rigidity of the gantry crane support, so that the gantry crane support will not deform when bearing weight on the I-beam track.

[0014] The structure of the above-mentioned adjustable support leg is as follows: a welded fixed seat is provided at the lower end of the assembly bracket. The welded fixed seat is threadedly connected with the full-thread screw of the support leg. Below the full-thread screw of the support leg, there is a circular bottom plate of the support leg. The height of one end can be adjusted through the screw structure, thereby adjusting the level of the device.

[0015] Below the two assembly brackets at the other end of the above-mentioned gantry crane support, there is a detachable gantry crane chassis connected. Below the gantry crane chassis, there are universal wheels. Between the two assembly brackets and the gantry crane chassis, there are diagonal tension rib plates connected. Between the two assembly brackets, there is a long diagonal tension rib plate connected. The gantry crane chassis can carry the current transformer CT body and can be disconnected from the gantry crane support. Together with the universal wheels, it constitutes a transfer trolley.

[0016] The disassembly and assembly method using the above-mentioned GIS current transformer integral disassembly and assembly device, the steps of disassembly and assembly are as follows:

[0017] Step 1: Place the current transformer CT sling under the current transformer CT, match and connect the groove of the CT bearing plate with the current transformer CT. Subsequently, use the connecting fixing plate to fixedly connect the CT bearing plate. Push the device into the working position so that the I-beam track is located above the current transformer CT. Lock each connection fastener of the device. Adjust the height-adjustable support leg to adjust the I-beam track to the horizontal position. Place the hand-pushed trolley directly above the current transformer CT. Use the shackle and eyebolt to connect the hoist and the current transformer CT sling;

[0018] Step 2: Synchronously operate each hoist to lift the current transformer CT body. When the current transformer CT body is completely separated from the lower circuit breaker, push the hand-pushed trolley so that the current transformer CT body is located above the gantry crane chassis;

[0019] Step 3: Synchronously operate each hoist to lower the current transformer CT body onto the gantry crane chassis. The weight of the current transformer CT body is borne by the gantry crane chassis;

[0020] Step 4: Loosen the connection between the current transformer CT sling and the chain block, and disassemble the connecting parts between the gantry lifting vehicle bracket, the diagonal stay rib plate and the gantry lifting vehicle chassis. The gantry lifting vehicle chassis and the universal wheels form the current transformer CT body transfer vehicle, which can be used to transfer the current transformer CT to the designated position. The reinstallation of the current transformer CT is carried out in the reverse process of the disassembly of the current transformer CT.

[0021] A GIS current transformer integral disassembly and assembly device and method provided by the present invention, compared with the prior art, this device has the functions of integral lifting and transfer of the current transformer CT. After the current transformer CT is lifted, it seamlessly connects and directly falls onto the current transformer CT transfer vehicle. During the reinstallation flange docking process of the current transformer CT, the position of the current transformer CT can be flexibly adjusted, which is convenient for accurate flange docking. The structure of this device is simple, compact and stable, and it can be flexibly disassembled, assembled and adjusted in the narrow space between GIS devices, avoiding obstacles such as cable trough boxes and electrical equipment arranged at the bottom and on both sides of the GIS, reducing the disassembly workload of the GIS and its auxiliary equipment, being easy to operate and labor-saving, improving the accuracy and installation quality of the reinstallation flange docking of the current transformer CT, improving the operation efficiency, and reducing the safety risk during the lifting process of the current transformer CT. Brief Description of the Drawings

[0022] The following further illustrates the present invention in conjunction with the drawings and embodiments:

[0023] Figure 1 It is the main structural view of the invention;

[0024] Figure 2 It is the right view of the invention;

[0025] Figure 3 It is the left view of the invention;

[0026] Figure 4 It is Figure 1 The partial enlarged view at A in

[0027] Figure 5 It is Figure 1 The partial enlarged view at B in

[0028] Figure 6 It is Figure 3 The partial enlarged view at C in

[0029] Figure 7 It is Figure 3 The partial enlarged view at D in

[0030] Figure 8 It is the top view of the current transformer CT sling;

[0031] Figure 9 It is Step 1 of the working example of this device;

[0032] Figure 10 This is the second step of the working example of the device;

[0033] Figure 11 This is the third step of the working example of the device.

[0034] In the figure: hand trolley 1, axial connection limit plate 2, chain block 3, current transformer CT sling 4, shackle 41, eye bolt 42, CT bearing plate 43, connection fixing plate 44, groove 45, I-beam track 5, gantry hoist support 6, assembly support 7, transverse stiffening plate 8, gantry hoist chassis 9, diagonal stiffening plate 10, first assembled diagonal stiffening plate 11, universal wheel 12, height-adjustable leg 13, full-thread screw of leg 131, round bottom plate of leg 132, fixed seat 133, assembled cross beam 14, second assembled diagonal stiffening plate 15, long diagonal stiffening plate 16, sliding wheel 17, roller 18. Specific implementation method

[0035] As Figure 1 shown in, the GIS current transformer overall disassembly and assembly device includes two gantry hoist supports 6. There is an I-beam track 5 between the two gantry hoist supports 6. A hand trolley 1 matching the "I" shape of the I-beam track 5 is provided on the I-beam track 5. A chain block 3 is provided below the hand trolley 1. The current transformer CT sling 4 is detachably connected below the chain block 3. The combination of the chain block 3 and the current transformer CT sling 4 can lift and lower the current transformer CT body, and the hand trolley 1 can be used to transfer the lifted current transformer CT body.

[0036] As Figure 6 shown in, the structure of the above-mentioned hand trolley 1 is as follows: Two sliding wheels 17 matching the "I" shape are provided on each I-beam track 5. Each sliding wheel 17 is composed of two rollers 18 on both sides of the "I" shape. The two rollers 18 are connected by bolts below, and the chain block 3 is connected below the bolts. An axial connection limit plate 2 is provided between the sliding wheels 17. The cooperation of the rollers 18 and the I-beam track 5 can make the load below move along the "I" beam track.

[0037] As Figure 8 shown in, the structure of the above-mentioned current transformer CT sling 4 is as follows: The current transformer CT sling 4 is composed of two CT bearing plates 43 combined. A groove 45 matching the bottom size of the current transformer CT is provided at the middle position of the combination of the CT bearing plates 43. A connection fixing plate 44 is provided between the two CT bearing plates 43. Eye bolts 42 are provided at both ends of the CT bearing plate 43. The current transformer CT sling 4 can be detachably connected to the upper chain block 3 through the shackle 41 and the eye bolt 42. The weight of the current transformer CT body can be steadily placed on the current transformer CT sling 4 through the groove of the CT bearing plate 43.

[0038] As Figures 1 - 3 shown in Figures 1 - 3 , the above-mentioned gantry crane support 6 is provided with two assembly brackets 7. The bottoms of the two gantry crane supports 6 are connected and fixed by a horizontal tension rib plate 8 to the assembled brackets 7. The horizontal tension rib plate 8 can make the whole device have better rigidity and mobility.

[0039] As Figure 2 shown in Figure 2 , between the two assembled brackets 7 of the above-mentioned one-end gantry crane support 6, there are two horizontal assembled cross beams 14 and second assembled diagonal tension rib plates 15 arranged staggeredly. Between the I-beam track 5 and the assembly bracket 7 at this end, there is a first assembled diagonal tension rib plate 11. At the lower end of the assembly bracket 7, there is a height-adjustable leg 13. The assembled cross beam 14 and the second assembled diagonal tension rib plate 15 strengthen the structural rigidity of the gantry crane support 6, so that the gantry crane support 6 will not be deformed when bearing the weight on the I-beam track 5.

[0040] As Figure 5 shown in Figure 5 , the structure of the above-mentioned adjustable leg 13 is as follows: at the lower end of the assembly bracket 7, there is a welded fixing seat 133. The welded fixing seat 133 is threadedly connected with the leg full-threaded screw 131. Below the leg full-threaded screw 131, there is a leg circular bottom plate 132. The height of one end can be adjusted through the screw structure, thereby adjusting the level of the device.

[0041] As Figures 1 - 3 shown in Figures 1 - 3 , below the two assembly brackets 7 of the other-end gantry crane support 6, there is a detachable gantry crane chassis 9 connected. Below the gantry crane chassis 9, there are universal wheels 12. Between the two assembly brackets 7 and the gantry crane chassis 9, there is a diagonal tension rib plate 10. Between the two assembly brackets 7, there is a long diagonal tension rib plate 16 connected. The gantry crane chassis 9 can carry heavy objects and can be disconnected from the gantry crane support 6, and together with the universal wheels 12, it constitutes a transfer trolley.

[0042] As Figures 9 - 11 shown in Figures 9 - 11 , using the disassembly and assembly method of the above-mentioned GIS current transformer integral disassembly and assembly device, the disassembly and assembly steps are as follows:

[0043] Step 1: Place the current transformer CT sling 4 under the current transformer CT, match and connect the groove of the CT bearing plate 43 with the current transformer CT, and then use the connecting fixing plate 44 to fixedly connect the CT bearing plate 43. Push the device into the working position so that the I-beam track 5 is located above the current transformer CT, lock all the connecting fasteners of the device, adjust the height-adjustable leg 13 to adjust the I-beam track 5 to the horizontal position. Place the hand-push trolley 1 directly above the current transformer CT, and use the shackle 41 and the eyebolt 42 to connect the hoist 3 and the current transformer CT sling 4;

[0044] Step 2: Synchronously operate each chain block 3 to lift the current transformer CT body. After the current transformer CT body is completely disengaged from the lower circuit breaker, push the hand trolley 1 to place the current transformer CT body above the chassis 9 of the gantry lifting vehicle;

[0045] Step 3: Synchronously operate each chain block 3 to lower the current transformer CT body onto the chassis 9 of the gantry lifting vehicle, and the weight of the current transformer CT body is borne by the chassis 9 of the gantry lifting vehicle;

[0046] Step 4: Loosen the connection between the current transformer CT sling 4 and the chain block 3, and disassemble the connecting parts between the gantry lifting vehicle bracket 6, the diagonal stay rib plate 10 and the chassis 9 of the gantry lifting vehicle. The chassis 9 of the gantry lifting vehicle and the universal wheels 12 form a transfer vehicle for the current transformer CT body. This transfer vehicle can be used to transfer the current transformer CT to the designated position. The reinstallation of the current transformer CT is carried out in the reverse process of the disassembly of the current transformer CT.

Claims

1. GIS current transformer integral disassembly and assembly device, characterized in that: including two There are two gantry hoist supports (6). An I-beam track (5) is provided between the two gantry hoist supports (6). A hand trolley (1) matching the "I" shape of the I-beam track (5) is provided on the I-beam track (5). A chain block (3) is provided below the hand trolley (1). The current transformer CT sling (4) is detachably connected below the chain block (3); The structure of the hand trolley (1) is as follows: Two sliding wheels (17) matching the "I" shape are provided on each I-beam track (5). Each sliding wheel (17) is composed of two rollers (18) on both sides of the "I" shape. The two rollers (18) are connected by bolts below, and the chain block (3) is connected below the bolts. An axial connection limiting plate (2) is provided between the sliding wheels (17); The structure of the current transformer CT sling (4) is as follows: The current transformer CT sling (4) is composed of two CT bearing plates (43). A groove (45) matching the bottom size of the current transformer CT is provided at the middle position of the combination of the CT bearing plates (43). A connecting fixing plate (44) is provided between the two CT bearing plates (43). Hoisting ring bolts (42) are provided at both ends of the CT bearing plate (43). The current transformer CT sling (4) can be detachably connected to the upper chain block (3) through a shackle (41) and the hoisting ring bolt (42); Below the two assembly brackets (7) at one end of the gantry hoist support (6), a detachable gantry hoist chassis (9) is connected. Universal wheels (12) are provided below the gantry hoist chassis (9). A diagonal stay rib plate (10) is connected between the two assembly brackets (7) and the gantry hoist chassis (9). The two assembly brackets (7) are connected by a long diagonal stay rib plate (16); The gantry hoist support (6) is provided with two assembly brackets (7). The bottoms of the two gantry hoist supports (6) are connected and fixed by a transverse stay rib plate (8) to connect the assembly brackets (7); The disassembly and assembly steps are as follows: Step 1: Place the current transformer CT sling (4) below the current transformer CT, match and connect the groove (45) of the CT bearing plate (43) with the current transformer CT. Subsequently, use the connecting fixing plate (44) to fixedly connect the CT bearing plates (43). Push the device into the working position so that the I-beam track (5) is located above the current transformer CT. Lock the connecting fasteners of the device. Adjust the height-adjustable support leg (13) so that the I-beam track (5) is in a horizontal position. Place the hand trolley (1) directly above the current transformer CT. Use a shackle (41) and a hoisting ring bolt (42) to connect the chain block (3) and the current transformer CT sling (4); Step 2: Synchronously operate each chain block (3) to lift the current transformer CT body. When the current transformer CT body is completely separated from the lower circuit breaker, push the hand trolley (1) so that the current transformer CT body is located above the gantry hoist chassis (9); Step 3: Synchronously operate each chain block (3) to lower the current transformer CT body onto the gantry hoist chassis (9). The weight of the current transformer CT body is borne by the gantry hoist chassis (9); Step 4: Loosen the connection between the current transformer CT lifting device (4) and the fall chain (3), remove the connecting parts between the gantry crane support (6), the inclined tie plate (10) and the gantry crane chassis (9), and the gantry crane chassis (9) and the universal wheel (12) form a current transformer CT body transport vehicle. This transport vehicle can be used to transport the current transformer CT to a designated location. The reinstallation of the current transformer CT is carried out according to the reverse process of the disassembly of the current transformer CT.

2. The overall disassembly and assembly device for GIS current transformers according to claim 1, characterized in that: Two horizontal assembled cross beams (14) and staggered second assembled oblique ribbed plates (15) are arranged between the two assembly brackets (7) at the other end of the portal crane bracket (6); a first assembled oblique ribbed plate (11) is provided between the I-beam rail (5) and the assembly bracket (7) at this end; and a height-adjustable support leg (13) is provided at the lower end of the assembly bracket (7).

3. The overall disassembly and assembly device for GIS current transformers according to claim 2, characterized in that, The structure of the adjustable leg (13) is as follows: a welding fixing seat (133) is provided at the lower end of the assembly bracket (7); the welding fixing seat (133) is connected to the leg full-thread screw (131) by threads; and a leg circular bottom plate (132) is provided below the leg full-thread screw (131).

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