Shielding device for GIS (Gas Insulated Switchgear) sleeve

Abstract

The utility model belongs to the technical field of gas-insulated metal-enclosed switchgear, and discloses a shielding device for a GIS bushing, the shielding device can be sleeved on the periphery of a terminal plate and a flange of the GIS bushing to balance an electric field, the shielding device comprises a first shielding ring, a second shielding ring, and a third shielding ring, the second shielding ring and the first shielding ring are coaxially arranged at an interval; the plurality of supporting pieces are fixedly connected between the first shielding ring and the second shielding ring, and the terminal plate and the flange are configured to be located in an accommodating space defined by the plurality of supporting pieces; the connecting plate is arranged in the containing space and connected with the multiple supporting pieces, the connecting plate is provided with receding holes, the receding holes are used for allowing the terminal plate to penetrate through, and the top of the flange is configured to bear the connecting plate. According to the utility model, the occurrence of electric field distortion areas can be significantly reduced, and a good electric field balancing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas insulation metal enclosed switch equipment technical field especially relates to a shielding device for GIS bushing. BACKGROUND

[0002] GIS equipment (GIS, Gas Insulated Switchgear, gas insulation metal enclosed switch), is the switch equipment that is widely favored in the power transmission and distribution industry. It has the advantages of small footprint, high reliability, no pollution, convenient maintenance, long service life, etc. It is very competitive in the switch equipment of domestic and foreign power transmission and distribution industry.

[0003] In the GIS equipment, the bushing is an important component of power transmission, responsible for the introduction and output of current. The bushing is usually composed of a bushing shell, a conductor, a gas insulation medium, a terminal plate and a flange. Among them, the conductor is located inside the bushing shell and penetrates the entire bushing shell as a current channel; the gas insulation medium is filled between the conductor and the bushing shell, and the gas insulation medium is used to isolate the conductor and the bushing shell to provide insulation protection and prevent electrical breakdown; the terminal plate is located at the end of the bushing shell, one end of the terminal plate is directly connected with the conductor, and the other end is connected with the external circuit or equipment through wiring; the flange is arranged at the connection between the terminal plate and the conductor, and the flange is connected with the bushing shell to form a seal to prevent the gas insulation medium inside the bushing shell from leaking.

[0004] However, due to the edge structure characteristics of the terminal plate, in the terminal plate area, the electric field distribution is prone to uneven, forming an irregular area of high electric field intensity, i.e. an electric field distortion area. Electric field distortion may cause abnormal partial discharge phenomenon, which will interfere with the partial discharge test results of the bushing. Specifically, electric field distortion may cause the generation of false discharge signals during the test, affecting the accuracy of the test data, and also causing large fluctuations and deviations in the test measurement results, weakening the repeatability and reliability of the test, and bringing difficulties to the performance evaluation of the bushing.

[0005] Therefore, it is urgent to provide a shielding device for GIS bushing to solve the above technical problems. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a shielding device for GIS bushing, which can significantly reduce the occurrence of electric field distortion area and has good balanced electric field effect.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a shielding device for GIS bushing, shielding device can be set in the periphery of terminal board and flange of GIS bushing to balance electric field, shielding device includes:

[0009] First shielding ring;

[0010] Second shielding ring, the second shielding ring is coaxial with the first shielding ring interval setting;

[0011] A plurality of support, a plurality of support fixedly connected between the first shielding ring and the second shielding ring, the terminal board and the flange are configured to be located in the containing space formed by a plurality of support surrounds;

[0012] Connecting plate is set up in the containing space with a plurality of support is connected, the connecting plate is set up with the avoiding hole, the avoiding hole is used for the terminal board passes through, the flange top is configured as the connecting plate is borne.

[0013] In some embodiments, each support includes a first segment and a second segment, the first segment is fixedly connected between the first shielding ring and the second shielding ring, the second segment is fixedly connected to the first segment and perpendicular to the first segment, each second segment is set up with first mounting hole, the connecting plate is set up with a plurality of second mounting hole, the second mounting hole is set up with the first mounting hole one to one, the first mounting hole and the second mounting hole are used for the connecting piece passes through, the connecting plate is connected to a plurality of second segments through the connecting piece.

[0014] In some embodiments, the shielding device further includes a shielding cover, the shielding cover is configured to from the first shielding ring into the containing space until the shielding cover is inverted in the connecting plate, the shielding cover can cover the terminal board in.

[0015] In some embodiments, the inner diameter of the first shielding ring is greater than the inner diameter of the second shielding ring.

[0016] In some embodiments, the shielding cover is limited in the area surrounded by a plurality of connecting pieces.

[0017] In some embodiments, the shielding cover outer wall is set up with the notch, the notch is used for clamping tool clamping.

[0018] In some embodiments, the avoiding hole is provided with two, the size of two avoiding holes is different, the center of two avoiding holes coincides and two avoiding holes are arranged at the included angle between two.

[0019] In some embodiments, two avoiding holes are perpendicular to each other.

[0020] In some embodiments, the first shielding ring and the second shielding ring are both aluminum tubes.

[0021] In some embodiments, the support is welded to the first shielding ring and to the second shielding ring.

[0022] The utility model discloses beneficial effect has:

[0023] The utility model provides a shielding device for GIS bushing, to the terminal board and flange of GIS bushing suit shielding device, the first shielding ring and second shielding ring in shielding device can form multilayer shielding effect, and then the more even electric field is constructed around terminal board and flange, weakens the electric field intensity of high electric field area, significantly reduces the emergence of electric field distortion area, has good balanced electric field effect. The shielding device is favorable to reduce the interference of electric field distortion to partial discharge test, significantly improves the accuracy and reliability of partial discharge test, and the structure of shielding device is simple, and convenient to assemble, is favorable to provide convenience for the overall performance test and quality control of GIS equipment. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the utility model embodiment, the following will be briefly introduced the drawings needed to be used in the utility model embodiment, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, under the premise of not paying creative labor, other drawings can also be obtained according to the contents of the utility model embodiment and these drawings.

[0025] Figure 1 It is the assembly schematic drawing of the shielding device provided by the utility model embodiment;

[0026] Figure 2 It is the assembly schematic drawing of the shielding device provided by the utility model embodiment;

[0027] Figure 3 It is the bottom view of the shielding device provided by the utility model embodiment after the connection plate and shielding cover are hidden;

[0028] Figure 4 It is the structure schematic drawing of the connection plate provided by the utility model embodiment;

[0029] Figure 5 It is the structure schematic drawing of the support provided by the utility model embodiment;

[0030] Figure 6 It is the top view of the support in Figure 5

[0031] Figure 7 ​is a structural schematic view of the first shielding ring provided by the embodiment of the utility model;

[0032] Figure 8 is a structural schematic view of the second shielding ring provided by the embodiment of the utility model;

[0033] Figure 9 is a structural schematic view of the shielding cover provided by the embodiment of the utility model;

[0034] Figure 10 is Figure 9 the shielding cover in the figure.

[0035] In the figure:

[0036] 1, the first shielding ring;

[0037] 2, the second shielding ring;

[0038] 3, the support piece; 31, the first section; 32, the second section; 321, the first mounting hole;

[0039] 4, the connecting plate; 41, the avoiding hole; 42, the second mounting hole;

[0040] 5, the shielding cover; 51, the notch. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantage of the embodiment of the utility model more clear, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings in the embodiment of the utility model, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the utility model.

[0043] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0044] In the description of the utility model, it needs to explain, the term "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, or it is the orientation or position relation that the utility model product uses usually, only is for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, constructs and operates with a particular orientation, therefore can not be understood as the limitation to the utility model. In addition, the term "first", "second", "third" and so on are only used for distinguishing description, and can not be understood as indicating or implying relative importance. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0045] In the description of the utility model, it also needs to explain that, unless otherwise specified and limited, the term "set", "connect" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, or electrically connected. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0046] In the utility model, unless otherwise specified and limited, the "upper" or "lower" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature in the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0047] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and can not be understood as the limitation of the utility model.

[0048] As Figures 1-4As shown, the shielding device for the GIS bushing provided by the embodiment can be sleeved on the periphery of the terminal plate and the flange (not shown in the figure) of the GIS bushing to balance the electric field. The principle of the shielding device to balance the electric field is that the shielding device is made of conductive material and has charge redistribution characteristics, and the surface of the shielding device can freely move the electric charge. Under the action of the external electric field, the surface charge of the shielding device will be rearranged according to the distribution of the external electric field. The induced electric field generated by the rearrangement is superimposed with the original electric field, thereby forming a new and more uniform electric field distribution around the terminal plate and the flange.

[0049] Specifically, the shielding device includes a first shielding ring 1, a second shielding ring 2, a plurality of support pieces 3, and a connecting plate 4. The second shielding ring 2 is coaxially and spaced apart from the first shielding ring 1. The plurality of support pieces 3 are fixedly connected between the first shielding ring 1 and the second shielding ring 2, and the terminal plate and the flange are configured to be located in an accommodation space formed by the plurality of support pieces 3. The connecting plate 4 is arranged in the accommodation space and connected with the plurality of support pieces 3. The connecting plate 4 is provided with a relief hole 41 for the terminal plate to pass through, and the top of the flange is configured to bear the connecting plate 4. In the embodiment, the number of support pieces 3 is four, and the four support pieces 3 are uniformly arranged along the circumference of the first shielding ring 1 and the second shielding ring 2, but are not limited thereto. In other embodiments, the number of support pieces 3 can also be increased or decreased as needed.

[0050] In specific implementation, the first shielding ring 1, the second shielding ring 2, the plurality of support pieces 3, and the connecting plate 4 are assembled into an integral shielding device, and then the integral shielding device is sleeved on the GIS bushing, so that the terminal plate and the flange are located in the accommodation space formed by the plurality of support pieces 3, and the terminal plate passes through the relief hole 41 until the connecting plate 4 abuts against the top of the flange. After the shielding device is sleeved on the GIS bushing, the GIS bushing can be subjected to a partial discharge test, and after the test is completed, the shielding device is removed from the GIS bushing.

[0051] Exemplarily, the first shielding ring 1 is an upper shielding ring, and the second shielding ring 2 is a lower shielding ring. When the shielding device is sleeved on the GIS bushing, the GIS bushing extends into the shielding device from the inner hole of the lower shielding ring.

[0052] This embodiment provides a shielding device for GIS bushings. By installing the shielding device on the terminal plate and flange of the GIS bushing, the first shielding ring 1 and the second shielding ring 2 in the shielding device can form a multi-layer shielding effect, thereby creating a more uniform electric field around the terminal plate and flange, weakening the electric field intensity in high electric field regions, significantly reducing the occurrence of electric field distortion regions, and achieving a good balanced electric field effect. This shielding device helps reduce the interference of electric field distortion on partial discharge tests, significantly improving the accuracy and reliability of partial discharge tests. Furthermore, the shielding device has a simple structure and is easy to assemble, which facilitates the overall performance testing and quality control of GIS equipment.

[0053] For example, the GIS bushing in this embodiment can be a 110KV GIS bushing.

[0054] In some embodiments, both the first shielding ring 1 and the second shielding ring 2 are aluminum tubes. Using aluminum tubes to fabricate the first shielding ring 1 and the second shielding ring 2 is advantageous because aluminum is a good conductor, effectively regulating the electric field distribution. Furthermore, the aluminum tube has very low magnetic permeability, resulting in smaller eddy currents and thus providing excellent shielding.

[0055] For example, the aluminum tube is 60mm × 2mm in size, that is, the outer diameter of the aluminum tube is 60mm and the wall thickness is 2mm.

[0056] Alternatively, the support member 3 can also be made of aluminum plate, and the connecting plate 4 can also be made of aluminum plate.

[0057] In some embodiments, the support member 3 is welded to the first shielding ring 1 and to the second shielding ring 2. Welding provides higher connection strength and eliminates gaps between adjacent components, resulting in good electrical conductivity between the support member 3 and the first shielding ring 1 and between the support member 3 and the second shielding ring 2, which helps to distribute the electric field evenly.

[0058] like Figure 4 As shown, in some embodiments, two clearance holes 41 are provided, the two clearance holes 41 are of different sizes, the centers of the two clearance holes 41 coincide and the two clearance holes 41 are set at an included angle.

[0059] This design makes the shielding device more versatile. Since the terminal blocks of different GIS bushings may have different sizes, two clearance holes 41 of different sizes are provided on the connecting plate 4. When the terminal block is smaller, the smaller clearance hole 41 is used to align the terminal block and allow it to pass through. When the terminal block is larger, the larger clearance hole 41 is used for matching.

[0060] Furthermore, such as Figure 4As shown, the two clearance holes 41 are arranged perpendicularly to each other. This special perpendicular position facilitates the machining of the two clearance holes 41.

[0061] like Figures 4-6 As shown, in some embodiments, each support member 3 includes a first segment 31 and a second segment 32. The first segment 31 is fixedly connected between the first shielding ring 1 and the second shielding ring 2. The second segment 32 is fixedly connected to the first segment 31 and perpendicular to the first segment 31. Each second segment 32 is provided with a first mounting hole 321. The connecting plate 4 is provided with a plurality of second mounting holes 42. The second mounting holes 42 are provided in a one-to-one correspondence with the first mounting holes 321. The first mounting holes 321 and the second mounting holes 42 are used for the connecting member to pass through. The connecting plate 4 is connected to the plurality of second segments 32 through the connecting member.

[0062] The connecting plate 4 is fixed to the support 3 through the connector, which facilitates disassembly and assembly, thereby helping to simplify the maintenance and repair process of the shielding device.

[0063] The connecting components include, but are not limited to, bolts.

[0064] Optionally, the second segment 32 is welded to the first segment 31.

[0065] like Figure 1 As shown, in some embodiments, the shielding device further includes a shielding cover 5, which is configured to extend from the first shielding ring 1 into the receiving space until the shielding cover 5 is inverted onto the connecting plate 4, and the shielding cover 5 can cover the terminal block inside. That is: after the structure formed by assembling the first shielding ring 1, the second shielding ring 2, multiple support members 3 and the connecting plate 4 is fitted into the GIS sleeve, the shielding cover 5 is then inverted onto the connecting plate 4, so that the terminal block is covered inside by the shielding cover 5.

[0066] With this setup, the shielding cover 5 forms an additional shielding layer, isolating the terminal block from the outside world, effectively shielding external electromagnetic interference, and preventing stray electric fields that may be generated in the terminal block area from spreading outward, thereby further optimizing the electric field distribution around the terminal block and improving the overall electric field uniformity of the shielding device.

[0067] In some embodiments, the shield 5 is confined within an area enclosed by multiple connectors. Taking bolts as an example of connectors, in this embodiment, there are four support members 3, and correspondingly four second segments 32. Therefore, the connecting plate 4 and the second segments 32 are connected by at least four bolts, which are distributed circumferentially. When the shield 5 is inverted and placed on the connecting plate 4, it is located within these four bolts. This arrangement helps to reduce the swaying of the shield 5 and maintain its stability.

[0068] In some embodiments, the inner diameter of the first shielding ring 1 is larger than the inner diameter of the second shielding ring 2. In this way, the first shielding ring 1 has a larger inner diameter, facilitating the assembly of the shielding cover 5.

[0069] Exemplarily, as shown in Figure 7 and Figure 8 , the radial distance between the inner ring and the outer ring of the first shielding ring 1 and the second shielding ring 2 is the same, the outer diameter d1 of the first shielding ring 1 is 480 mm, and the outer diameter d2 of the second shielding ring 2 is 420 mm.

[0070] As shown in Figure 9 and Figure 10 , in some embodiments, the shielding cover 5 is provided with a notch 51 on the outer wall, and the notch 51 is used for clamping by a clamping tool. That is, the shielding cover 5 is taken and placed by using the clamping tool, and the design of the notch 51 facilitates the positioning and clamping of the clamping tool.

[0071] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A shielding device for a GIS bushing, characterized in that, The shielding device can be sleeved on the periphery of the terminal plate and the flange of the GIS bushing to balance the electric field, and the shielding device comprises: a first shielding ring (1); a second shielding ring (2) coaxially spaced apart from the first shielding ring (1); a plurality of support pieces (3) fixedly connected between the first shielding ring (1) and the second shielding ring (2), the terminal plate and the flange being arranged in a containing space surrounded by the plurality of support pieces (3); a connecting plate (4) arranged in the containing space and connected with the plurality of support pieces (3), the connecting plate (4) being provided with a avoiding hole (41) for the terminal plate to pass through, and the top of the flange being arranged to bear the connecting plate (4).

2. The shielding device for the GIS bushing according to claim 1, wherein each of the support pieces (3) comprises a first segment (31) fixedly connected between the first shielding ring (1) and the second shielding ring (2) and a second segment (32) fixedly connected with the first segment (31) and perpendicular to the first segment (31), each of the second segments (32) is provided with a first mounting hole (321), the connecting plate (4) is provided with a plurality of second mounting holes (42) corresponding to the first mounting holes (321), the first mounting holes (321) and the second mounting holes (42) are used for connecting pieces to pass through, and the connecting plate (4) is connected to the plurality of second segments (32) through the connecting pieces.

3. The shielding device for the GIS bushing according to claim 2, wherein the shielding device further comprises a shielding cover (5) arranged to extend into the containing space from the first shielding ring (1) until the shielding cover (5) is inverted on the connecting plate (4), and the shielding cover (5) can cover the terminal plate.

4. The shielding device for the GIS bushing according to claim 3, wherein the inner diameter of the first shielding ring (1) is greater than the inner diameter of the second shielding ring (2).

5. The shielding device for the GIS bushing according to claim 3, wherein the shielding cover (5) is limited in an area surrounded by the plurality of connecting pieces.

6. The shielding device for the GIS bushing according to claim 3, wherein the shielding cover (5) is provided with a notch (51) on the outer wall for a clamping tool to clamp.

7. The shielding device for the GIS bushing according to claim 1, wherein the avoiding holes (41) are provided in two, the two avoiding holes (41) are different in size, the centers of the two avoiding holes (41) coincide, and the two avoiding holes (41) are arranged at an included angle.

8. The shielding device for GIS bushing according to claim 7, characterized in that, the two said escape holes (41) are arranged perpendicular to each other.

9. The shielding device for GIS bushing according to any one of claims 1-8, characterized in that, the first shielding ring (1) and the second shielding ring (2) are both aluminum tubes.

10. The shielding device for GIS bushing according to any one of claims 1-8, characterized in that, the support member (3) is welded to the first shielding ring (1) and to the second shielding ring (2).

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