GIS with protection device

Abstract

The utility model relates to the technical field of gas insulated switchgear, and especially relates to a GIS with a protective device. A GIS with a protection device comprises an isolation grounding switch shell flange connecting part, a bus cylinder flange connecting part and an insulation spacer which are fixedly connected through threaded connecting pieces, a protection cover with a downward opening is fixedly assembled on the bus cylinder flange connecting part, the protection cover is used for covering the bus cylinder flange connecting part, and the isolation grounding switch shell flange connecting part, the bus cylinder flange connecting part and the insulation spacer are fixedly connected through threaded connecting pieces. The protective cover is provided with a central hole for avoiding the bus cylinder, and the central hole of the protective cover is in sealing fit with the bus cylinder. Rain and snow are prevented from entering the insulation basin through the threaded connection part of the threaded connection piece, the insulation basin is prevented from cracking due to large expansion force after water accumulated at the insulation basin is frozen in an environment with low air temperature, and the sealing reliability of the GIS equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of gas insulated switchgear, in particular to a GIS with a protective device. Background Art

[0002] GIS (Gas-Insulated Metal-Enclosed Switchgear) is a unit consisting of various switchgear and busbars. Because all high-potential conductors in a GIS are housed within a metal casing filled with SF6 gas as an insulating and arc-extinguishing medium, it is protected from environmental influences. Each component can be constructed into an independent gas chamber, allowing for selective removal of faulty components in the event of a fault, resulting in high operational reliability. GIS also boasts a compact structure, tight sealing, and low maintenance costs. These exceptional performance attributes have led to its widespread application in high-voltage applications.

[0003] In recent years, power resources have become a top priority to promote economic development and improve livelihoods in western China. Western regions, such as Gansu, Qinghai, and Shaanxi, are characterized by dramatic climate change, large temperature swings, severe sandstorms, and elevations exceeding 1,700 meters. This requires highly reliable power transmission and transformation equipment. Therefore, GIS equipment plays a crucial role in power grid construction in western China. Tight sealing, a prominent advantage of GIS equipment, is one of the key reasons for its widespread use in western China.

[0004] like Figure 1-2 As shown, GIS equipment generally includes a subassembly consisting of a DS / ES and a BUS. Specifically, to ensure the supporting insulation of both, flange connections are provided at the assembly points of the isolating and grounding switch housing 10 and the busbar barrel 20. An insulating basin 30 is provided between the isolating and grounding switch housing flange connection 11 and the busbar barrel flange connection 21. Stud bolts 40 pass through the isolating and grounding switch housing flange connection 11, the insulating basin 30, and the busbar barrel flange connection 21 in sequence to ensure the reliability of the three-way connection. However, when the temperature drops sharply and rain or snow occurs, rain and snow may enter the insulating basin through the threaded fittings of the stud bolts and into the interior of the insulating basin. Due to the large temperature fluctuations and the different materials and thermal expansion coefficients of the insulating basin and the metal flange, the water accumulated in the insulating basin will expand greatly after freezing, which can easily cause the insulating basin to crack, posing a risk of air leakage in the GIS equipment. Utility Model Content

[0005] The purpose of the utility model is to provide a GIS with a protective device, which is used to solve the problem that in rainy and snowy weather, rain and snow may enter the insulating basin through the threaded fitting of the stud bolts and easily cause the insulating basin to crack, resulting in the risk of air leakage in the GIS equipment.

[0006] The utility model adopts the following technical solution: a GIS with a protective device includes an isolating and grounding switch housing flange connection, a busbar barrel flange connection and an insulating basin, the three of which are fixedly connected by threaded connectors, and a protective cover with an opening facing downward is fixedly mounted on the busbar barrel flange connection, the protective cover is used to cover the busbar barrel flange connection part, the protective cover has a center hole that avoids the busbar barrel, and the center hole of the protective cover is sealed and fitted with the busbar barrel.

[0007] Furthermore, the threaded connection is a stud bolt, and a support stud is connected to the upper threaded section of the stud bolt. The support stud passes through the protective cover and the protective cover is fixedly assembled by screwing a fixing nut on the support stud. A sealing structure is provided between the protective cover and the support stud.

[0008] Furthermore, the support stud is provided with a threaded hole, and is screwed onto the stud bolt through the threaded hole.

[0009] Furthermore, the support stud includes a stepped rod body, the small diameter section of the stepped rod body is provided with a threaded section, the large diameter section is provided with the threaded hole, and the protective cover is placed on the step surface of the support stud and is tightened and fixed by the fixing nut on its upper side.

[0010] Furthermore, the sealing structure includes an upper waterproof gasket provided at the connection between the fixing nut and the protective cover.

[0011] Furthermore, the sealing structure also includes an upper sealing rubber layer that wraps the fixing nut and the waterproof gasket.

[0012] Furthermore, a lower waterproof washer is provided at the assembly point between the upper nut of the stud bolt and the flange connection portion of the busbar barrel, and a lower sealing rubber layer is provided on the upper nut and the lower waterproof washer.

[0013] Furthermore, the protective cover is a split structure that is sealed and spliced.

[0014] Furthermore, an overlapping sealant layer is provided on the overlapping seams of each split protective cover.

[0015] The GIS with a protective device of the present invention improves the existing GIS. The beneficial effects of the GIS with a protective device of the present invention are as follows: a protective cover with an opening facing downward is fixedly mounted on the flange connection of the busbar barrel. The protective cover covers the flange connection of the busbar barrel, so that the threaded connector is located within the protective cover. The center hole of the protective cover is in sealing contact with the busbar barrel to ensure the sealing between the protective cover and the busbar barrel. In this way, when it rains or snows outside, the protective cover protects the assembly structure connecting the isolating earthing switch and the busbar, preventing rain and snow from entering the interior of the insulating basin through the threaded connection of the threaded connector, and preventing the insulating basin from cracking due to the large expansion force of water accumulated in the insulating basin after freezing in a low temperature environment, thereby ensuring the sealing reliability of the GIS equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of an existing GIS structure;

[0017] Figure 2 It is a structural diagram of another structure of the existing GIS;

[0018] Figure 3 This is a schematic structural diagram of an embodiment of a GIS with a protective device according to the present utility model;

[0019] Figure 4 for Figure 3 A top view of the protective cover in FIG.

[0020] Figure 5 for Figure 4 Left view in;

[0021] Figure 6 for Figure 3 Schematic diagram of the structure of the support stud;

[0022] Figure 7 for Figure 3 Schematic diagram of the structure of the waterproof gasket;

[0023] Figure 8 for Figure 3 A schematic diagram of the structure of the fixing nut in FIG.

[0024] Figure 9 for Figure 3 A magnified view of the structure at A in FIG;

[0025] Figure 10 for Figure 3 Schematic diagram of the structure of the protective cover and the guide bar.

[0026] In the figure: 1. Protective cover; 2. Support studs; 3. Upper waterproof gasket; 4. Fixing nut; 5. Upper sealing layer; 10. Isolating and earthing switch housing; 11. Isolating and earthing switch housing flange connection; 20. Busbar barrel; 21. Busbar barrel flange connection; 30. Insulating basin; 40. Stud bolts; 50. Diversion bar; 111. Protective cover joint; 112. Support stud assembly hole; 113. Diversion bar avoidance; 222. Step surface; 223. Threaded hole. DETAILED DESCRIPTION

[0027] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0028] First, the technical solution of the present invention is generally described as follows:

[0029] like Figure 1-2 As shown, the GIS equipment includes an isolating earthing switch and a busbar assembly. The upper end opening of the isolating earthing switch housing 10 is provided with an isolating earthing switch flange connection portion, and the busbar barrel 20 is provided with a busbar barrel flange connection portion 21 for assembling with the isolating earthing switch. In order to ensure the supporting insulation of the assembly of the isolating earthing switch housing 10 and the busbar barrel 20, an insulating basin 30 is provided between the isolating earthing switch housing flange connection portion 11 and the busbar barrel flange connection portion 21. The stud bolts 40 are passed through the isolating earthing switch housing flange connection portion 11, the insulating basin 30 and the busbar barrel flange connection portion 21 in sequence. The nuts of the stud bolts 40 are respectively locked at the upper and lower ends of the insulating basin 30 and the busbar barrel flange connection part 21 to achieve a fixed connection between the three and ensure internal sealing. However, since the stud bolts 40 are located in the outside for a long time, when it is cold or rainy or snowy, moisture may enter the screw hole of the insulating basin 30 through the threaded fitting of the stud bolts 40. Due to the low temperature and the different materials and thermal expansion coefficients of the insulating basin 30 and the metal flange, the water accumulated in the insulating basin will expand greatly after freezing, which may easily cause the insulating basin 30 to crack, making the GIS equipment have the risk of air leakage.

[0030] Therefore, based on the problems of the prior art, the present invention is conceived to protect the stud bolts and specifically designs a GIS with a protective device. During long-term use, the assembly of the isolating and earthing switch housing and the busbar barrel is protected to prevent rain and snow from entering the insulating basin through the stud bolts. The GIS with a protective device of the present invention, the GIS isolating and earthing switch and the busbar, and the assembly of the two are all in the same manner as the prior art, so they are not described in detail. The key point of the present invention is that a protective cover with an opening facing downward is fixedly mounted on the flange connection of the busbar barrel. The protective cover covers the flange connection of the busbar barrel, so that the stud bolts are also protected within the protective cover. The protective cover has a center hole that avoids the busbar. The center hole of the protective cover is sealed with the busbar barrel to ensure the sealing between the protective cover and the busbar barrel. In this way, when it rains or snows outside, the protective cover protects the connection between the isolating and earthing switch and the busbar assembly structure, preventing rain and snow from entering the insulating basin through the threaded connection of the stud bolts, preventing the insulating basin from cracking due to excessively low temperature, and ensuring the sealing reliability of the GIS equipment.

[0031] Specific embodiment of the GIS with protective device of the utility model:

[0032] The structural diagram of the GIS with a protective device of the present invention is as follows Figure 3-10 As shown, a GIS with a protective device includes an isolating and earthing switch and a busbar. Specifically, the isolating and earthing switch includes an isolating and earthing switch housing 10, the upper opening of which includes an isolating and earthing switch housing flange connection portion 11. The busbar includes a busbar barrel 20, which includes a busbar barrel flange connection portion 21 for assembly with the isolating and earthing switch housing flange connection portion 11. An insulating basin 30 is provided between the busbar barrel flange connection portion 21 and the assembly point of the busbar barrel flange connection portion 21 to provide support and insulation for the isolating and earthing switch and the busbar. A threaded through hole is defined in the insulating basin 30, through which a threaded connector passes through the isolating and earthing switch housing flange connection portion 11, the insulating basin 30, and the busbar barrel flange connection portion 21 in sequence. In this embodiment, the threaded connector is a stud bolt 40. An upper nut and a lower nut are screwed onto both ends of the stud bolt 40 to secure the three together, thereby ensuring a reliable seal within the GIS. Of course, in other embodiments, a single-headed bolt with one end fixed and the other end screwed with a nut can also be used for fixation.

[0033] In order to prevent the stud bolts 40 from being exposed, and rainwater from easily entering the threaded through holes of the insulating basin 30 from the outer surface of the stud bolts 40, causing cracks in the insulating basin 30 and affecting the entire GIS equipment, the utility model fixes a protective cover 1 with an opening facing downward on the flange connection part 21 of the busbar barrel. The protective cover 1 covers the flange connection part 21 of the busbar barrel. The upper surface of the protective cover 1 has a center hole that avoids the busbar barrel 20. The center hole of the protective cover 1 is sealed and fits with the busbar barrel 20.

[0034] Since the protective cover 1 is assembled above the flange connection portion 21 of the busbar barrel, the distance between the protective cover 1 and the end of the stud bolt 40 is relatively close. Therefore, in order to facilitate assembly and make the assembly structure simpler, no additional holes are opened. Preferably, the upper threaded section of the stud bolt 40 is connected with a support stud 2, and the support stud 2 passes through the protective cover 1 and is fixedly assembled by screwing the fixing nut 4 on the support stud 2. In this way, the support stud 2 is arranged on the stud bolt 40, the assembly distance is shorter, and there is no need to open other assembly ports to achieve assembly, which reduces the assembly gap, improves the protection effect, and can protect the stud bolt 40. Of course, in other embodiments, the protective cover 1 can also be supported on the upper nut of the stud bolt 40 through the stud bolt 40, and then the protective cover 1 is directly fixed and assembled by setting a screw nut on the top.

[0035] Specifically, to improve the reliability of the assembly of the protective cover 1 and ensure greater stability during use, preferably, since the stud 40 has a threaded section above it, a threaded hole 223 is provided below the support stud 2, through which the support stud 2 is screwed onto the stud 40 to securely assemble the protective cover 1. This not only improves the reliability of the assembly of the support stud 2, but also further protects the stud 40 by being screwed onto the support stud 40. Of course, in other embodiments, the support stud 2 may also be provided with a through hole, so that the support stud 2 is sleeved onto the stud 40.

[0036] Furthermore, in order to ensure the stability of the protective cover 1, the support stud 2 includes a stepped rod body, the upper diameter of the support stud 2 is smaller than the lower diameter, the small diameter section of the stepped rod body is provided with a threaded section, and the large diameter section is provided with a threaded hole. The protective cover 1 is placed on the step surface 222 of the support stud 2 and is pressed and fixed by the fixing nut 4 on the upper side thereof. The protective cover 1 is placed on the step surface 222 of the support stud 2, so that the protective cover 1 is supported on the step surface 222 to screw the fixing nut 4, which is easy to operate and the assembled protective cover 1 has higher reliability and stability. Of course, in other embodiments, when the upper and lower diameters of the support stud 2 are uniform, the fixing effect of the protective cover 1 is achieved by nuts that are screwed relative to each other on both sides of the protective cover 1.

[0037] In this embodiment, in order to improve the sealing performance of the fixed assembly of the waterproof cover, a sealing structure is provided between the protective cover 1 and the support stud 2. Preferably, the support stud 2 is provided with a fixing nut 4, and the sealing structure includes an upper waterproof gasket 3 provided at the connection between the fixing nut 4 and the protective cover 1. The upper waterproof gasket 3 ensures good sealing performance at the assembly point between the support stud 2 and the fixing nut 4.

[0038] Furthermore, to prevent rain and snow from entering the interior of the insulation basin 30 through the connection between the support stud 2 and the stud 40, the sealing structure preferably includes an upper sealant layer 5, specifically RTV sealant, that wraps around the fixing nut 4 and the upper waterproof washer. This ensures the sealing of the threaded connection, providing multiple layers of protection for the insulation basin 30 and ensuring reliability during long-term use. In this embodiment, a lower waterproof washer is provided at the assembly point between the upper nut of the stud 40 and the busbar barrel flange connection 21. The upper nut and lower waterproof washer are coated with a lower sealant layer.

[0039] In order to facilitate the assembly of the protective cover 1, in this embodiment, preferably, the protective cover 1 is a split structure that is sealed and spliced, specifically using two semicircular split protective covers for sealed splicing, which is easy to use and has better adaptability.

[0040] In order to improve the sealing performance of the joints between the split protective covers 1, preferably, overlapping sealant is provided at the joints 111 of the protective covers of each split protective cover 1, specifically RTV sealant is used to ensure good sealing performance after the joints between the split protective covers 1, and prevent external rain and snow from entering the interior of the protective covers 1 through the joints 111 of the protective covers. Of course, in other embodiments, rubber pads can also be provided at the joints 111 of the split protective covers and fixed to the joints 111 of the protective covers.

[0041] In this embodiment, two groups of symmetrically distributed support stud assembly holes 112 are provided on the protective cover 1 for the support studs 2 to pass through. Since the isolating and grounding switch housing 10 has a guide bar 50, a guide bar avoidance opening 113 is also provided on the side wall of the protective cover 1 to ensure that the protective cover 1 is as compact as possible.

[0042] The above description of the specific embodiment of the GIS with a protective device of the present invention shows that the GIS with a protective device of the present invention is characterized by a protective cover fixedly mounted on the flange connection of the busbar barrel with its opening facing downward. The protective cover covers the flange connection of the busbar barrel, so that the threaded connector is located within the protective cover. The center hole of the protective cover is in sealing contact with the busbar barrel to ensure the seal between the protective cover and the busbar barrel. In this way, when it rains or snows outside, the protective cover protects the assembly structure connecting the isolating earthing switch and the busbar, preventing rain and snow from entering the interior of the insulating basin through the threaded connection of the threaded connector, and preventing the insulating basin from cracking due to the large expansion force of water accumulated in the insulating basin after freezing in a low temperature environment, thereby ensuring the sealing reliability of the GIS equipment.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A GIS with a protective device, comprising a flange connection portion of an isolating and grounding switch housing, a flange connection portion of a busbar barrel, and an insulating basin, the three being fixedly connected by threaded connectors, characterized in that: A protective cover with an opening facing downward is fixedly mounted on the flange connection of the busbar barrel. The protective cover is used to cover the flange connection of the busbar barrel. The protective cover has a center hole that avoids the busbar barrel. The center hole of the protective cover is sealed and fits with the busbar barrel.

2. The GIS with a protective device according to claim 1, characterized in that: The threaded connection is a stud bolt, and a support stud is connected to the upper threaded section of the stud bolt. The support stud passes through the protective cover and is fixedly assembled by a fixing nut screwed on the support stud. A sealing structure is provided between the protective cover and the support stud.

3. The GIS with a protective device according to claim 2, characterized in that: The supporting stud is provided with a threaded hole and is screwed onto the stud bolt through the threaded hole.

4. The GIS with a protective device according to claim 3, characterized in that: The support stud comprises a stepped rod body, a threaded section is provided on the small diameter section of the stepped rod body, and the threaded hole is provided on the large diameter section. The protective cover is placed on the step surface of the support stud and is tightened and fixed by the fixing nut on its upper side.

5. The GIS with a protective device according to claim 2, characterized in that: The sealing structure includes an upper waterproof gasket provided at the connection between the fixing nut and the protective cover.

6. The GIS with a protective device according to claim 2, characterized in that: The sealing structure also includes an upper sealing rubber layer that wraps the fixing nut and the waterproof gasket.

7. The GIS with a protective device according to claim 2, characterized in that: A lower waterproof washer is provided at the assembly position of the upper nut of the stud bolt and the flange connection portion of the busbar barrel, and a lower sealing rubber layer is provided on the upper nut and the lower waterproof washer.

8. The GIS with a protective device according to any one of claims 1 to 7, characterized in that: The protective cover is a split structure that is sealed and spliced.

9. The GIS with a protective device according to claim 8, characterized in that: An overlapping sealant layer is provided on the overlapping seams of each split protective cover.

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