GIS branch bus through-wall device

Abstract

The utility model relates to the field of gas insulated switchgear, in particular to a wall-penetrating device for a GIS (gas insulated switchgear) branch bus. The wall penetrating device for the GIS branch bus comprises an inner sealing plate and an outer sealing plate which are correspondingly arranged on the indoor side and the outdoor side during installation, the inner sealing plate and the outer sealing plate are provided with installation holes for the GIS branch bus to penetrate through, and the outer sealing plate is provided with a cover body. The cover body comprises an annular fixing part which is parallel to the outer sealing plate and used for being coaxially installed with the GIS branch bus and a cylindrical matching part which extends in the axial direction of the installation hole, the inner diameter of the matching part is larger than the outer diameter of the GIS branch bus, and the matching part is used for absorbing radial slight swing, caused by temperature change, of the GIS branch bus; the matching part is provided with a flexible sleeve which is sleeved and fixed on the matching part and the outer wall of the GIS branch bus during installation, and axial position changes of the GIS branch bus caused by temperature changes can be balanced through stretching and retracting of the flexible sleeve in the operation process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas insulation switch device especially relates to a GIS branch bus wall -penetrating device. BACKGROUND

[0002] With the rapid development of national economy and electric power industry, the scale of power grid is increasingly huge, and gas insulated metal enclosed switchgear (GIS: Gas Insulated Switchgear) is widely used in the substation in recent years because of its small influence on operation by external environment, no need for regular maintenance, small land occupation and other advantages. GIS refers to the primary equipment except transformer in a substation, including bus, circuit breaker, disconnecting switch, grounding switch, voltage transformer, current transformer, surge arrester, cable terminal, incoming and outgoing line bushing, etc. which are organically combined through optimized design and sealed by the container filled with sulfur hexafluoride gas as insulation gas. The GIS bus can be divided into main bus, branch bus and bus tie according to different functions. The branch bus is used for the connection of GIS and external equipment. GIS is not only widely used in high voltage and super high voltage field, but also used in extra high voltage field. Compared with conventional open substation, the advantages of GIS are compact structure, small land occupation, high reliability, flexible configuration, easy installation, strong safety and strong environmental adaptability.

[0003] In the indoor GIS substation, the GIS is arranged in a dedicated GIS room, and the GIS must be connected with the line incoming line or connected with the adjacent main transformer to realize power transmission. The branch bus for realizing power transmission between the GIS and the external equipment is generally provided with a hole penetrating the wall to the outdoor. A GIS pipe type bus wall penetrating plugging device is disclosed in a Chinese utility model patent with the authorization announcement No. CN210326895U and the authorization announcement date of April 14, 2020. The plugging device improves the problems of pipe body corrosion and gas leakage caused by the original cement mortar plugging wall penetrating, loosening and water seepage caused by equipment operation vibration at the plugging position. An installation hole with a diameter larger than the outer diameter of the pipe body of the branch bus is formed on the wall of the GIS room. Sealing plates are arranged on the inner and outer sides of the installation hole and are fixed on the wall by screws. The same side sealing plates are divided into at least two pieces along the radial direction of the installation hole and are connected by splicing to avoid the formation of a magnetic flux loop and the generation of magnetic induction current. A circular hole corresponding to the pipe body of the branch bus is formed in the center of the sealing plates on the inner and outer sides, which is used for the branch bus to penetrate the wall. A waterproof rubber pad is arranged between the pipe body of the branch bus and the sealing plate on the outdoor side. The parts are fixed and connected by the waterproof rubber body to prevent rainwater from penetrating. A fire barrier bag is arranged on the outer side of the branch bus pipe body between the sealing plates on the inner and outer sides, and the inner sealing plate is made of a fireproof plate. The device avoids the heating caused by the magnetic field circulation of the GIS branch bus and realizes the functions of waterproofing, fireproofing and corrosion resistance, but does not consider the expansion and deformation of the GIS branch bus caused by temperature change during operation. Utility model content

[0004] The utility model discloses a kind of GIS branch bus wall penetrating devices, to solve the problem of expansion and deformation of GIS branch bus when GIS branch bus operates.

[0005] The technical scheme of the GIS branch bus wall penetrating device of the utility model is as follows:

[0006] A GIS branch bus wall penetrating device, comprising inner and outer sealing plates arranged on the indoor and outdoor sides during installation, respectively, installation holes for the GIS branch bus to penetrate are formed in the inner and outer sealing plates, a cover body is arranged on the outer sealing plate, the cover body comprises a fixed portion annularly parallel to the outer sealing plate for coaxial installation with the GIS branch bus and a cylindrical cooperation portion extending axially along the installation hole, the inner diameter of the cooperation portion is larger than the outer diameter of the GIS branch bus, and a flexible sleeve is arranged on the cooperation portion and the outer wall of the GIS branch bus during installation.

[0007] Further, the flexible sleeve is composed of a rubber plate rolled and bonded.

[0008] Further, the GIS branch bus wall penetrating device further comprises a protective layer for wrapping the wall penetrating part of the GIS branch bus.

[0009] Further, the flexible sleeve is fixedly connected to the fitting part and the outer wall of the GIS branch bus through the clamping device.

[0010] Further, the wall-penetrating device of the GIS branch bus comprises an outer frame for covering the reserved hole of the wall, so as to isolate the wall and the GIS branch bus.

[0011] Further, each side of the outer frame is composed of a cold-bent C-shaped steel with a square cross section.

[0012] Further, the inner and outer sealing plates are at least composed of two parts along the radial direction of each mounting hole.

[0013] Further, waterproof glue is coated between the protective layer and the flexible sleeve, the flexible sleeve and the cover, and the cover and the outer sealing plate.

[0014] Further, a fireproof bag is arranged between the inner and outer sealing plates.

[0015] Further, the inner and outer sealing plates are both aluminum alloy plates.

[0016] Beneficial effects: The wall-penetrating device of the GIS branch bus is an improved invention. The wall-penetrating device of the GIS branch bus comprises inner and outer sealing plates arranged on the indoor and outdoor sides respectively during installation, so as to prevent foreign matters in the outdoor from entering the indoor and affecting the normal operation of the GIS. The inner and outer sealing plates are provided with mounting holes for the GIS branch bus to pass through. The outer sealing plate is provided with a cover, and the cover comprises a fixing part in the shape of a ring and parallel to the outer sealing plate, and a fitting part in the shape of a cylinder and extending along the axial direction of the mounting hole. The fixing part is used for fixing the sealing plate firmly, and the inner diameter of the fitting part is greater than the outer diameter of the GIS branch bus, so as to absorb the slight radial swing of the GIS branch bus caused by temperature change. The fitting part wraps the GIS branch bus, and the fitting part is provided with a flexible sleeve which is sleeved and fixed on the fitting part and the outer wall of the GIS branch bus during installation. During operation, the axial position change of the GIS branch bus caused by temperature change can be balanced through the expansion and contraction of the flexible sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic view of an embodiment of the wall-penetrating device of the GIS branch bus of the utility model;

[0018] Figure 2 FIG. 2 is a side view of the wall-penetrating device of the GIS branch bus of the utility model; Figure 1

[0019] Figure 3 FIG. 6 is a local enlarged view of the X part in FIG. 5; Figure 1

[0020] Figure 4 FIG. 7 is a local enlarged view of the Y part in FIG. 5; Figure 2 ​​A local enlarged view of the middle Y part.

[0021] In the figure: 1, outer sealing plate; 2, GIS branch bus; 3, mounting hole; 4, cover body; 5, flexible sleeve; 6, clamping device; 7, outer frame; 8, waterproof glue; 9, fixed part; 10, matching part; 11, protective layer; 12, inner sealing plate. DETAILED DESCRIPTION

[0022] The features and performances of the utility model will be further described in detail below in combination with embodiments.

[0023] The sealing property, insulation property and weather resistance of the GIS branch bus wall-penetrating device have great influence on the reliability of the GIS as a whole. The utility model is conceived to leave a certain gap at the wall-penetrating position of the GIS branch bus and fix it to the wall body by a material with elasticity to realize the influence on the installation error and the deformation caused by temperature in the operation process.

[0024] Based on the above conception, as shown in Figure 1 , 2 , 4, in a basic embodiment, the GIS branch bus wall-penetrating device of the utility model comprises inner and outer sealing plates arranged on the indoor and outdoor sides respectively for corresponding arrangement in the installation, to prevent the outdoor foreign matters from entering the indoor and affecting the normal operation of the GIS, and the inner and outer sealing plates are provided with mounting holes for the GIS branch bus to pass through, wherein the outer sealing plate 1 on the outdoor side is provided with a cover body 4, the cover body 4 comprises a fixed part 9 in the shape of a ring and parallel to the outer sealing plate 1 for coaxial installation with the GIS branch bus 2 and a matching part 10 in the shape of a cylinder and extending axially along the mounting hole 3, the fixed part 9 is used for firm fixation with the outer sealing plate 1, the inner diameter of the matching part 10 is greater than the outer diameter of the GIS branch bus 2, for absorbing the slight radial swing of the GIS branch bus 2 caused by temperature change, the matching part wraps the GIS branch bus 2, and the matching part 10 is provided with a flexible sleeve 5 sleeved and fixed on the outer wall of the GIS branch bus 2 and the matching part 10 in the installation, which can balance the axial position change of the GIS branch bus 2 caused by temperature change through the expansion and contraction of the flexible sleeve 5 in the operation process.

[0025] The cover body 4 is positioned and installed through the installation position of the GIS branch bus 2, which can avoid the situation that there is no gap or the gap is uneven between the matching part 10 of the cover body 4 and the GIS branch bus 2 due to the installation deviation of the GIS branch bus 2, since the installation condition cannot be determined in the design, the fixed position of the cover body 4 on the outer sealing plate 1 is not provided with a mounting hole, and the outer sealing plate 1 is drilled and processed according to the positioning condition on site, to realize the adjustment of the installation error of the GIS branch bus.

[0026] As shown in Figure 3As shown, in a preferred embodiment, the flexible sleeve 5 is composed of a rubber plate rolled and bonded, the tension and the diameter of the flexible sleeve 5 can be freely adjusted according to actual needs, and no non-standard parts are needed as spare parts, reducing the production and processing process and saving costs. In other embodiments, the flexible sleeve 5 can be made in advance according to the design size, although the installation difficulty and production cost will increase, but it can also work normally. The GIS branch busbar wall-penetrating device further comprises a protective layer 11 for wrapping the wall-penetrating part of the GIS branch busbar 2, which is made of a rubber plate wrapped, which can reduce the risk of damage and air leakage caused by friction and collision during installation, avoid the increase of cleaning installation process caused by wall material attachment during installation, and at the same time can play a certain fireproof effect. In other embodiments, the outer wall of the GIS branch busbar 2 is not wrapped with a rubber plate, although there is a risk of damage, but it can work normally.

[0027] In the actual installation process, first wrap the GIS branch busbar 2 with a rubber plate to form a sleeve shape, cut off the excess part and fix it on the outer wall of the GIS branch busbar 2, after the GIS branch busbar 2 is inserted into the installation hole 3, the rubber plate is wrapped around the fitting part 10 of the cover body 4 and the outer wall of the GIS branch busbar 2, the tension and the distance between the two are adjusted, after meeting the installation requirements, the excess part is cut off, and the rubber plate is bonded into a cylindrical shape and fixedly connected with the fitting part 10 of the cover body 4 and the outer wall of the GIS branch busbar 2.

[0028] In a preferred embodiment, the flexible sleeve 5 is fixedly connected to the fitting part 10 and the outer wall of the GIS branch busbar 2 by the clamping device 6. Using the clamping device 6 for fixation, the diameter and tension of the clamping device 6 can be adjusted according to the actual situation, and the clamping device 6 is a standard part, which can reduce the production and processing process, reduce the production cost, and is convenient to maintain and replace.

[0029] In other embodiments, a belt can be used for fixation, which can also play a role in clamping fixation and can work normally.

[0030] In a preferred embodiment, the GIS branch busbar 2 wall-penetrating device comprises an outer frame 7 for edge covering of the wall reserved hole, to isolate the wall and the GIS branch busbar 2. The outer frame 7 is pre-buried during civil construction according to the design scheme, and the installation hole 3 is designed for the outer sealing plate 1 according to the actual position of the GIS branch busbar 2 during GIS installation. The inner and outer sealing plates are fixed on the outer frame 7 by self-tapping screws, forming a square cavity isolated from the wall inside, and the wall-penetrating part of the GIS branch busbar 2 is located inside the square cavity, which can prevent the GIS branch busbar 2 from contacting the wall material and being corroded, and at the same time, the vibration of the GIS branch busbar 2 during operation is reduced after passing through the outer frame 7, avoiding loosening or air gap caused by rainwater infiltration.

[0031] In other embodiments, the outer frame 7 is not provided, and the sealing plate 1 is directly fixed to the wall, which can still work normally, although the service life of the GIS branch bus 2 is reduced, and the installation mode is consistent with the above-mentioned comparative document.

[0032] In a preferred embodiment, each side of the outer frame 7 is composed of an open relative and fixed connection of a cold-rolled C-shaped steel with a square cross section, which has good bending and folding resistance, is light, convenient to cut and weld, easy to install, can effectively reduce the influence of GIS branch bus 2 vibration on the wall during GIS operation, improve the service life of GIS branch bus 2, and reduce the overall cost. In other embodiments, square steel is used as the material of the outer frame 7, which can still work normally, although the cost is increased and the damping performance is poor.

[0033] In a preferred embodiment, the inner and outer sealing plates are at least divided into two parts along the radial direction of each mounting hole 3. In order to facilitate installation, the mounting hole 3 is generally divided into two parts in the radial direction parallel to the short side for split production. The inner and outer sealing plates are produced by laser cutting, which can ensure good flatness of the inner and outer sealing plates. When the two parts are spliced, only a small gap is left, and the gap is sealed to prevent rainwater from penetrating from the outside of the wall. In other embodiments, the inner and outer sealing plates are not designed in a split manner, which can still work normally, although there may be some safety risks.

[0034] In a preferred embodiment, waterproof glue 8 is applied to the connection between the protective layer 11, the flexible sleeve 5, the flexible sleeve 5, the cover 4, and the outer sealing plate 1. The gap between the parts is filled with waterproof glue 8 to prevent rainwater from entering the GIS room through the gap and causing abnormal GIS operation or electric shock accidents caused by the penetration of rainwater.

[0035] In other embodiments, the connection between the components on the outdoor side is not waterproofed with waterproof glue 8, and the risk of rainwater penetration can be reduced through tight fitting. Although there are still some safety risks, it can still work normally.

[0036] In a preferred embodiment, fireproof bags are placed between the inner and outer sealing plates. Multiple fireproof bags are arranged in the cavity between the inner and outer sealing plates 1. The outer layer of a common fireproof bag is a bag-shaped structure made of tightly woven and specially treated durable glass fiber cloth, and the inside is filled with special fire-resistant, heat-insulating and expanding materials. The fireproof bag is non-combustible, with a fire resistance limit of more than 4 hours, which is convenient for on-site maintenance personnel to handle. The fireproof bag will expand and solidify at a high temperature to form a heat and smoke insulation seal, and has good fire and moisture resistance. The fireproof performance can be improved by filling fireproof bags.

[0037] In other embodiments, the inner sealing plate 12 is replaced by a fireproof plate in the gap between the inner and outer sealing plates without setting fireproof bags, which can also play a certain fireproof role and can work normally.

[0038] In a preferred embodiment, the inner and outer sealing plates are both aluminum alloy plates, which are light in weight and easy to install, can reduce the difficulty of installation at the GIS construction site, and are non-magnetic materials, so that using the aluminum alloy plates can avoid heating caused by the formation of a magnetic flux loop on the inner and outer sealing plates. The inner and outer sealing plates are fixedly connected with the outer frame 7 through self-tapping screws with a 100mm spacing, which ensures the stability of the connection and the processability of the on-site installation, and can be adjusted according to the on-site installation conditions.

[0039] In other embodiments, the inner and outer sealing plates are both stainless steel plates, which can also avoid the formation of a magnetic flux loop, but the cost of the stainless steel plates is higher, and the processing conditions required for the installation site are harsh.

[0040] During the civil engineering, according to the design drawings, the outer frame 7 is pre-buried first, and then during the subsequent equipment installation, after the GIS equipment is installed and the GIS branch bus 2 is stretched out of the hole reserved in the wall of the GIS room, the rubber plate is wrapped around the surface of the GIS branch bus 2 first to form a cylindrical structure, the excess part is cut off, the hoop device 6 is used for fixation, at this time, the cover body 4 is positioned according to the actual installation position of the bus, the outer sealing plate 1 is drilled through the fixing hole of the cover body 4, then the fixing part 9 of the cover body 4 is fixed on the outer sealing plate 1 through bolts, the outer sealing plate 1 on the outdoor side is fixedly connected with the pre-buried outer frame 7 through self-tapping screws with a 100mm spacing, at this time, the center of the cover body 4 is coaxial with the center of the GIS branch bus 2, at this time, the rubber plate is wrapped around the cooperation part 10 of the cover body 4 on the outdoor side and the GIS branch bus 2, the excess part is cut off, and the hoop device 6 is used for fixation, then waterproof glue 8 is applied at the connection positions of the components on the outdoor side as waterproof treatment, the fireproof bags are placed in the sealing plate 1, and finally the inner sealing plate 12 on the indoor side is fixed on the outer frame 7 through self-tapping screws with a 100mm spacing.

[0041] The above is only a preferred embodiment of the present application, and does not limit the present application, the patent protection scope of the present application is subject to the claims, any equivalent structural changes made by referring to the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A GIS branch busbar wall-penetrating device, comprising inner and outer sealing plates for corresponding installation on indoor and outdoor sides during installation, wherein the inner and outer sealing plates are provided with mounting holes for the GIS branch busbar to pass through, characterized in that, The outer sealing plate is provided with a cover, which includes an annular fixing part parallel to the outer sealing plate for coaxial installation with the GIS branch busbar and a cylindrical mating part extending axially along the mounting hole. The inner diameter of the mating part is larger than the outer diameter of the GIS branch busbar. The mating part is provided with a flexible sleeve that is fitted and fixed to the mating part and the outer wall of the GIS branch busbar during installation.

2. The GIS branch busbar wall penetration device according to claim 1, characterized in that, The flexible sleeve is made of rolled and bonded rubber sheets.

3. The GIS branch busbar wall-penetrating device according to claim 1 or 2, characterized in that, The GIS branch busbar wall penetration device also includes a protective layer for wrapping the wall penetration portion of the GIS branch busbar.

4. The GIS branch busbar wall-penetrating device according to claim 1 or 2, characterized in that, The flexible sleeve is fixedly connected to the mating part and the outer wall of the GIS branch busbar by a clamping device.

5. The GIS branch busbar wall-penetrating device according to claim 1 or 2, characterized in that, The GIS branch busbar through-wall device includes an outer frame for wrapping the pre-reserved holes in the wall to isolate the wall from the GIS branch busbar.

6. The GIS branch busbar wall-penetrating device according to claim 5, characterized in that, Each side of the outer frame is composed of cold-formed C-shaped steel with opposite openings that are fixedly connected to form a square cross-section.

7. The GIS branch busbar wall-penetrating device according to claim 1, 2, or 6, characterized in that, The inner and outer sealing plates are composed of at least two parts joined together along the radial direction of each mounting hole.

8. The GIS branch busbar wall-penetrating device according to claim 3, characterized in that, Waterproof adhesive is applied to the joints between the protective layer and the flexible sleeve, the flexible sleeve and the cover, and the cover and the outer sealing plate.

9. The GIS branch busbar wall-penetrating device according to claim 1, 2, or 6, characterized in that, A fireproof bag is placed between the inner and outer sealing plates.

10. The GIS branch busbar wall-penetrating device according to claim 1, 2, or 6, characterized in that, Both the inner and outer sealing plates are made of aluminum alloy.

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