Transformer substation handover test shielding combination device for GIS (Gas Insulated Switchgear)

Abstract

The utility model relates to the technical field of gas insulated switch devices, in particular to a shielding combination device for a transformer substation handover test for a GIS (Gas Insulated Switchgear). The shielding combination device comprises a butt joint tee joint, a shielding device, an end cover and a sealing cover plate, the butt joint tee joint is divided into two coaxially arranged straight-through ends and a vertical end axially vertical to the straight-through ends, the end cover is fixedly connected with an electric connection combination, the electric connection combination comprises an electric connection, and the shielding device is fixedly connected with the end cover. A butt joint conductor is arranged on the electric connector, a shielding device is detachably installed at the lower end of the butt joint conductor, the vertical end of the butt joint tee joint is fixedly connected with the GIS, and the axial direction of the straight-through end is the vertical direction, so that the shielding device is convenient to assemble and disassemble. According to the transformer substation handover test shielding combination device for the GIS, butt joint is simple when a voltage sensor is installed after a handover test is finished, an electric connection assembly does not need to be replaced, a large amount of manpower and material resources are saved, the installation period is shortened, and meanwhile potential safety hazards of operation of a power station are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas insulated switchgear technical field especially relates to a substation handover test shielding combination device for GIS. BACKGROUND

[0002] GIS (Gas insulated swichgear) is the metal closed switchgear that adopts sulfur hexafluoride gas as insulation and arc extinguishing medium, breaker, disconnecting switch, grounding switch, current transformer, voltage transformer, bus etc. parts are sealed in the metal cavity inside. The design of GIS full-closed makes it less affected by the environment, safe and reliable in operation, and the land area is much smaller than that of relative open type air insulation switchgear AIS (Air insulated switchgear), and is favored by the electric power system. In order to check whether there is various hidden troubles (including insulation damage, foreign matter etc. in packaging, transportation, storage, installation and debugging, maintenance) that lead to internal failure after the overall installation of GIS and the maintenance of components, verify whether its insulation performance is good, whether it meets the requirements of relevant standards, corresponding insulation test needs to be carried out. The test voltage of on-site insulation handover test is high, if the conductor surface exists sharp end or protrusion, the uneven electric field can discharge to the low voltage end, so the end part of GIS needs to be installed shielding device during the test, to optimize the field strength distribution of the conductor end, meet the requirements of insulation handover test.

[0003] Because the test voltage of insulation handover test is far greater than the rated primary voltage value of voltage transformer, the magnetic field density in the core far exceeds the saturation point value of the core magnetization curve during the test, the excitation current increases sharply, the core temperature rises, the core overheats and is easy to cause thermal breakdown, which can cause damage to the voltage transformer, so after the end of insulation handover test, GIS and voltage transformer are installed again.

[0004] As shown in Figure 4 The existing substation handover test shielding combination device for GIS includes butt joint tee 1, butt joint tee 1 includes two straight-through ends coaxially arranged and vertical end perpendicular to the axial direction of straight-through end, one straight-through end of butt joint tee 1 is connected with GIS 11 through flange, at this time, the vertical end faces downward, end cover 3 is arranged in butt joint tee, end cover 3 is fixedly installed with the end part of GIS 11, shielding device 2 for preventing sharp end discharge is arranged on the side of end cover away from GIS, because shielding device 2 is arranged in left-right direction at this time, the straight-through end of butt joint tee 1 is arranged in left-right direction, which is convenient for installing and dismounting shielding device 2, the vertical end is opened downward and is used for cooperating with voltage transformer 12 for installation, sealing cover plate 4 is arranged on the other two ends of tee 1 during transportation; after on-site installation, the current structure is not changed temporarily, insulation handover test is carried out to detect GIS 11; after completing insulation handover test, sealing cover plate 4 and shielding device 2 are removed,Figure 5 As shown in the figure, the conductive rod 13 at the end of the GIS 11 is conductively connected with the center conductor of the GIS, and the end of the conductive rod 13 away from the GIS 11 is provided with a prior art electrical connection 14, and the end of the prior art electrical connection 14 away from the conductive rod 13 faces downward, and is connected with the terminal of the voltage transformer 12 through the vertical end of the butt tee 1, and the replacement of the conductive rod 13 and the electrical connection 14 on site is difficult, the butt period is long, and it is not conducive to the installation of the GIS 11, and the risk of mixing foreign matters in the GIS bus cylinder during the disassembly process is greatly increased, which brings great hidden dangers to the safe and stable operation in the later period. The utility model discloses a kind of GIS for substation handover test shielding combination device, to solve the problems that existing GIS for substation handover test shielding combination device needs to replace electrical connection on site, high installation difficulty and not conducive to the safe operation of power system.

[0005] The utility model discloses a kind of GIS for substation handover test shielding combination device using the following technical solutions:

[0006] The utility model discloses a kind of GIS for substation handover test shielding combination device using the following technical solutions:

[0007] A kind of GIS for substation handover test shielding combination device, including butt tee, shielding device, for installing the end cap of GIS end and installing the sealing cover plate of butt tee end, butt tee is divided into two coaxially arranged straight-through end and one vertical end being axially perpendicular to straight-through end, the end cap is fixedly connected with electrical connection combination, and the electrical connection combination includes electrical connection, and the butt conductor for being connected with voltage transformer is arranged on electrical connection, and the lower end of butt conductor is detachably installed with shielding device, and the vertical end of butt tee is fixedly connected with GIS, and the axial direction of straight-through end is vertical direction, and butt conductor is located on the axis of straight-through end, to realize that shielding device is conveniently mounted and dismounted.

[0008] Further, the side of electrical connection close to end cap is provided with columnar connecting block, and the two ends of connecting block are fixedly connected with end cap and electrical connection respectively.

[0009] Further, the side of connecting block facing electrical connection is provided with buffer groove, and elastic pad is arranged in buffer groove.

[0010] Further, connecting block and electrical connection are connected through screw, and operating groove for connecting connecting block and electrical connection is formed in electrical connection.

[0011] Further, the operating groove is provided with baffle for avoiding sharp-point discharge, and baffle is fixedly installed on electrical connection through screw.

[0012] Further, electrical connection is provided with butt hole for the installation and positioning of butt conductor.

[0013] Further, the butt conductor is connected with the electric connection through a screw connection, and the electric connection is provided with an operation hole for connecting the butt conductor and the electric connection.

[0014] Further, the end cover is provided with a buffer groove on the side close to the electric connection combination, and the buffer groove is provided with an elastic pad.

[0015] Further, the shielding device has a surface of a rotary body and is smooth, and the upper end of the shielding device is provided with a square groove matched with the butt conductor.

[0016] Further, the bottom of the groove of the shielding device is provided with a bolt hole to realize the fixed connection of the shielding device and the butt conductor.

[0017] Beneficial effects: The utility model discloses an improved invention. The GIS substation handover test shielding combination device includes a butt tee, a shielding device, an end cover for being installed at the end of GIS and a sealing cover plate installed at the end of the butt tee, is used for guaranteeing that insulation butt joint test is normally completed, prevents foreign matter from mixing and influencing normal operation in the process of transportation and test through the sealing cover plate, the butt tee is divided into two coaxially arranged straight-through ends and a vertical end axially perpendicular to the straight-through end, the end cover is fixedly connected with an electric connection combination, the electric connection combination includes an electric connection, the electric connection is provided with a butt conductor for being connected with a voltage transformer, can be directly connected with the voltage transformer, and the electric connection structure does not need to be replaced, the lower end of the butt conductor is detachably installed with the shielding device, the vertical end of the butt tee is fixedly connected with GIS, and the axial direction of the straight-through end is vertical, to realize that the shielding device is conveniently assembled and disassembled, the GIS substation handover test shielding combination device is simple to connect when installing the voltage sensor after the handover test is finished, does not need to replace the electric connection component in the butt tee, saves a large amount of manpower, material resources and installation period, and simultaneously also greatly reduces the security hidden danger of power station operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of one embodiment of the GIS substation handover test shielding combination device of the utility model;

[0019] Figure 2 It is a structure schematic view of one embodiment of the GIS substation handover test shielding combination device of the utility model; Figure 1 It is a structure schematic view of the connection of GIS and voltage transformer after test;

[0020] Figure 3 It is a structure schematic view of one embodiment of the GIS substation handover test shielding combination device of the utility model; Figure 2 It is a partial enlarged view of the GIS substation handover test shielding combination device;

[0021] Figure 4 It is a structure schematic view of one embodiment of the GIS substation handover test shielding combination device of the utility model;

[0022] Figure 5 for Figure 4 A schematic diagram of the connection between the GIS and the voltage transformer after the test.

[0023] In the diagram: 1. Docking tee; 2. Shielding device; 3. End cap; 4. Sealing cover; 5. Electrical connection; 6. Docking conductor; 7. Connecting block; 8. Elastic pad; 9. Baffle; 10. Operating hole; 11. GIS; 12. Voltage transformer; 13. Conductive rod; 14. Existing technology electrical connection. Detailed Implementation

[0024] By improving the connection structure of the shielding assembly for substation handover testing of GIS equipment, the installation difficulty can be reduced, while also lowering the risk of foreign objects entering the cylinder. The concept of this invention is to design an electrical connection assembly that allows voltage transformers to be directly connected to the electrical connection for conductive connection.

[0025] The specific implementation method of the shielding combination device for substation handover test of GIS of this utility model is as follows:

[0026] Based on the above ideas, such as Figure 1 As shown, in a basic embodiment, the GIS substation handover test shielding assembly of this utility model includes a docking tee 1, a shielding device 2, an end cover 3 for installation at the end of the GIS 11, and a sealing cover plate 4 installed at the end of the docking tee 1 to ensure the normal completion of the insulation docking test. The sealing cover plate 4 prevents foreign matter from entering during transportation and testing and affecting normal operation. The docking tee 1 is divided into two coaxially arranged straight ends and a vertical end perpendicular to the axis of the straight ends. The end cover 3 is fixedly connected to an electrical connection assembly, which includes an electrical connection 5. The electrical connection 5 is provided with a connection for connecting to a voltage transformer 12. The connecting conductor 6 can be directly connected to the voltage transformer 12 without replacing the electrical connection structure. The lower end of the connecting conductor 6 is detachably equipped with a shielding device 2. The vertical end of the connecting tee 1 is fixedly connected to the GIS 11. The axis of the straight end is vertical, and the connecting conductor is located on the axis of the straight end to facilitate the installation and removal of the shielding device 2. The GIS substation handover test shielding combination device of this utility model is simple to connect when installing the voltage sensor 12 after the handover test, without replacing the internal electrical connection components of the connecting tee 1, saving a lot of manpower, material resources and installation time, and also greatly reducing the safety hazards of substation operation.

[0027] In a preferred embodiment, the electrical connection 5 is provided with a cylindrical connecting block 7 near one side of the end cover 3, and the two ends of the connecting block 7 are fixedly connected with the end cover 3 and the electrical connection 5 respectively. The connecting block 7 can shorten the length of the electrical connection 5, reduce the difficulty of processing and installation, and avoid breakage due to vibration during transportation. In other embodiments, the connecting block 7 is not provided between the electrical connection 5 and the end cover. Although the electrical connection 5 may be too long, it can be normal by increasing the support structure, optimizing the center of gravity position, and achieving similar effects.

[0028] In a preferred embodiment, the side of the connecting block 7 facing the electrical connection 5 is provided with a buffer groove, and an elastic pad 8 is arranged in the buffer groove. In the transportation or working state, the connecting block 7 and the electrical connection 5 are prevented from being in rigid contact and causing damage, which affects the normal operation of the power system. In other embodiments, a contact finger structure is provided between the two to avoid collision damage while ensuring good flow capacity and avoiding virtual connection. It can achieve similar functions and work normally.

[0029] In a preferred embodiment, the connecting block 7 and the electrical connection 5 are connected by screws, and the electrical connection 5 is provided with an operating slot for connecting the connecting block 7 and the electrical connection 5. The operating slot can realize convenient and quick installation and disassembly, and increase the installation process of the GIS substation handover test shielding combination device. In other embodiments, the operating slot is not provided, and special tools can be used to disassemble and assemble the electrical connection 5 and the connecting block 7, which can also work normally.

[0030] In a preferred embodiment, the operating slot is provided with a baffle 9 for avoiding point discharge, and the baffle 9 is fixedly installed on the electrical connection 5 by screws. The baffle 9 can ensure the flow capacity of the electrical connection 5, and the screws connecting the two sections can enhance the structural strength of the electrical connection 5 and ensure the stability of the structure. In other embodiments, the baffle 9 is not provided, and the size and shape of the operating slot are optimized to reduce the impact of the operating slot on the structural strength, which can achieve similar functions and work normally.

[0031] In a preferred embodiment, the electrical connection 5 is provided with a butt joint hole for installing and positioning the butt joint conductor 6. The butt joint hole can play the role of positioning, guiding and increasing the contact area, which can facilitate installation, reduce installation difficulty, increase contact area and ensure good flow capacity, and avoid virtual connection between the two to affect the normal operation of the power system. In other embodiments, the butt joint conductor 6 is directly fixedly connected with the outer wall of the electrical connection 5, and the outer wall structure of the electrical connection 5 is optimized to ensure good fixing effect and flow capacity, which can achieve similar functions and work normally.

[0032] In a preferred embodiment, the butt conductor 6 and the electrical connection 5 are connected by screws, and the electrical connection 5 is provided with an operating hole 10 for connecting the butt conductor 6 and the electrical connection 5. The operating slot can be conveniently and quickly installed and disassembled, and the installation process of the GIS substation handover test shielding combination device is increased. In other embodiments, the operating slot is not provided, and the butt conductor 6 is fixedly installed on the electrical connection 5 by welding, which can also ensure stable connection and current flow, and can also work normally.

[0033] In a preferred embodiment, the end cover 3 is provided with a buffer groove near the side of the electrical connection combination, and the buffer groove is provided with an elastic pad 8. In the transportation or working state, the end cover 3 and the electrical connection 5 or the connecting block 7 are prevented from being in rigid contact to cause damage and affect the normal operation of the power system. In other embodiments, a contact finger structure is provided between the two to avoid collision and damage, while also ensuring good current flow capacity, avoiding virtual connection, and achieving similar functions, and can work normally.

[0034] In a preferred embodiment, the shielding device 2 has a surface of a rotary body, which is smooth and has no sharp ends to avoid sharp end discharge leading to GIS damage. The upper end of the shielding device 2 is provided with a square groove cooperating with the butt conductor 6 to ensure good current flow capacity and prevent discharge breakdown between the two due to virtual connection. The bottom of the groove of the shielding device 2 is provided with a bolt hole to realize the fixed connection of the shielding device 2 and the butt conductor 6.

[0035] After production is completed, the voltage transformer 12 and the GIS are respectively subjected to factory detection, the electrical connection 5 assembly is directly spliced and fixed together, the electrical connection 5 and the connecting block 7 are aligned, the screw is inserted through the operating slot, and the ratchet wrench can be quickly tightened and fixed, then the blocking piece 9 is fixedly installed, secondly the butt conductor 6 is inserted into the butt joint hole, the butt conductor 6 and the electrical connection 5 are fixedly connected through the operating hole 10, the current flow capacity of the two is ensured, then the shielding device 2 is fixedly installed at the other end of the butt conductor 6, finally the butt tee 1 is connected with the end flange of the GIS 11, the other two ends are sealed by the sealing cover plate 4, and then the vehicle transportation can be carried out.

[0036] As Figure 2 , 3As shown, after being transported to the installation site for installation, without disassembling the GIS substation handover test shielding combined device, first, the insulation handover test of the GIS equipment is carried out, whether the GIS 11 is ensured to be intact and undamaged in the transportation process is detected, after the test is completed and it is determined that the overall structure of the GIS 11 is intact and the function is normal, under the premise of ensuring the safety of the personnel, the two sealing cover plates 4 are disassembled from the butt joint tee 1, and the shielding structure is disassembled from the electrical connection combination, the conductive joint of the voltage transformer 12 is butt jointed with the butt joint conductor 6, and is fixed and installed through the screw, so that the quick butt joint installation is realized.

[0037] The above is only a preferred embodiment of the present application, and is not used to limit the present application, the patent protection scope of the present application is subject to the claims, any equivalent structural changes made by applying the content of the specification and drawings of the present application should be included in the protection scope of the present application.

Claims

1. A shielding assembly for substation handover testing of GIS (Gas-Insulated Switchgear), comprising a docking tee, a shielding device, an end cover for installation at the end of the GIS, and a sealing cover plate installed at the end of the docking tee, wherein the docking tee is divided into two coaxially arranged straight ends and a vertical end perpendicular to the axis of the straight ends, characterized in that, The end cap is fixedly connected to an electrical connection assembly, which includes an electrical connection. The electrical connection is provided with a docking conductor for connecting to a voltage transformer. A shielding device is detachably installed at the lower end of the docking conductor. The vertical end of the docking tee is fixedly connected to the GIS. The axis of the straight end is vertical, and the docking conductor is located on the axis of the straight end.

2. The shielding assembly for substation handover testing of GIS according to claim 1, characterized in that, A columnar connecting block is provided on the side of the electrical connector near the end cover, and the two ends of the connecting block are fixedly connected to the end cover and the electrical connector, respectively.

3. The shielding combination device for substation handover testing of GIS according to claim 2, characterized in that, A buffer groove is provided on the side of the connecting block facing the electrical connection, and an elastic pad is provided inside the buffer groove.

4. The shielding assembly for substation handover testing of GIS according to claim 2 or 3, characterized in that, The connecting block is connected to the electrical connection by screws, and the electrical connection has an operating groove for connecting the connecting block and the electrical connection.

5. The shielding combination device for substation handover testing of GIS according to claim 4, characterized in that, The operating slot is equipped with a baffle to prevent tip discharge, and the baffle is fixedly installed on the electrical connection by screws.

6. The shielding assembly for substation handover testing of GIS according to any one of claims 1-3, characterized in that, The electrical connection is provided with mating holes for positioning and installing the mating conductors.

7. The shielding assembly for substation handover testing of GIS according to any one of claims 1-3, characterized in that, The docking conductor and the electrical connection are connected by screws, and the electrical connection has an operating hole for connecting the docking conductor and the electrical connection.

8. The shielding assembly for substation handover testing of GIS according to any one of claims 1-3, characterized in that, The end cap is provided with a buffer groove on the side near the electrical connection assembly, and an elastic pad is provided in the buffer groove.

9. The shielding assembly for substation handover testing of GIS according to any one of claims 1-3, characterized in that, The outer contour of the shielding device is a rotating body with a smooth surface, and the upper end of the shielding device has a square groove that mates with the docking conductor.

10. The GIS substation handover test shielding assembly according to claim 9, characterized in that, The bottom of the groove of the shielding device is provided with bolt holes to achieve a fixed connection between the shielding device and the docking conductor.

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