A grounding switch for GIS

Abstract

The present invention relates to a grounding switch for GIS. The grounding switch for GIS includes a shell with a mounting hole, a static end structure and a moving contact, the static end structure includes a cover plate and a grounding bar, the cover plate includes a plate body outside the shell and a conductive sleeve on a side of the plate body facing the mounting hole and extending into the shell, the cover plate and the conductive sleeve are an integrated structure, the outer edge of the plate body is detachably fixed to the shell, and an insulating plate is provided between the outer edge of the plate body and the shell, the conductive sleeve extends into the mounting hole, the inner hole of the conductive sleeve forms a plug hole for the moving contact to be inserted, and the inner wall of the plug hole is provided with a contact finger for making the cover plate and the moving contact conductive, and the two ends of the grounding bar are conductively connected to the cover plate and the shell respectively. An insulating plate is provided between the plate body and the shell, the insulating plate has a simple structure, is easy to process, and reduces the installation cost of the static contact; a contact finger is installed in the plug hole of the conductive sleeve, the cover plate is conductive to the moving contact through the contact finger, and the moving contact may not be provided with a contact finger and a contact finger seat, which simplifies the structure of the moving contact.

Description

Technical Field

[0001] The invention belongs to power system equipment, and in particular relates to a grounding switch for GIS. Background Art

[0002] The grounding switch is a mechanical switching device used to ground the circuit. Under abnormal conditions (such as short circuit), it can carry the specified abnormal current within a specified time. The grounding switch is an important module on GIS equipment.

[0003] The existing grounding switch includes a housing, a static end structure and a dynamic end structure. The dynamic end structure includes a dynamic contact. The dynamic contact is equipped with a finger seat. A spring finger is installed at the inner hole of the finger seat. The dynamic contact is electrically connected to the static contact through the spring finger. Since the dynamic contact needs to be equipped with a finger seat, the overall structure of the dynamic contact is relatively complex. The static end structure includes a static contact and a grounding bar. In order to ensure the current carrying capacity of the grounding circuit, the static contact is connected to the housing through the grounding bar. The static contact usually needs to be cast with an epoxy resin insulator to achieve fixed installation of the static contact. The epoxy resin is used to insulate the static contact from the housing. The epoxy resin manufacturing process is complex and the cost is high. Summary of the invention

[0004] The object of the present invention is to provide a grounding switch for GIS, so as to solve the technical problems in the prior art that the structure of the moving contact of the grounding switch is relatively complex and the installation cost of the static contact is relatively high.

[0005] To achieve the above object, the technical solution of the GIS grounding switch of the present invention is:

[0006] A grounding switch for GIS comprises a shell with a mounting hole, a static end structure fixed at the mounting hole and a moving contact located in the shell, the static end structure comprising a cover plate and a grounding bar, the cover plate comprising a plate body outside the shell and a conductive sleeve located at a side of the plate body facing the mounting hole and extending into the shell, the cover plate and the conductive sleeve are an integrated structure, the outer edge of the plate body is detachably fixed to the shell, an insulating plate is provided between the outer edge of the plate body and the shell, the conductive sleeve extends into the mounting hole, the inner hole of the conductive sleeve forms a plug hole for the moving contact to be inserted, a contact finger is provided on the inner wall of the plug hole, the static end structure is electrically conductive with the moving contact through the contact finger on the cover plate, two ends of the grounding bar are respectively conductively connected to the cover plate and the shell, a side of the plate body facing away from the mounting hole is provided with a grounding protrusion protruding outwardly facing away from the mounting hole, the grounding bar is fixed on the grounding protrusion, the outer edge of the plate body is fixed to the shell by bolts, the distance between the bolt and the center of the cover plate is greater than the distance between the grounding protrusion and the center of the cover plate, and the height of the grounding protrusion protruding from the plate body is greater than the height of the bolt head from the plate body.

[0007] The beneficial effect is as follows: the GIS grounding switch of the present invention comprises a housing, a static end structure and a moving contact. The static end structure comprises a cover plate and a grounding bar. The cover plate is connected to the housing through the grounding bar. To achieve insulation between the cover plate and the housing, an insulating plate is provided between the plate body of the cover plate and the housing. The insulating plate has a simple structure, is easy to process and has a low cost. A contact finger is installed in the socket of the conductive sleeve of the cover plate. The static end structure conducts electricity with the moving contact through the contact finger on the cover plate. The moving contact is no longer provided with a contact finger and a contact finger seat, which simplifies the structure of the moving contact and solves the technical problem that the moving contact structure is relatively complex and the static contact installation cost is relatively high in the grounding switch of the prior art. In addition, the volume of the plate body can be reduced, thereby reducing the weight of the GIS grounding switch. By integrating the cover plate, it plays a role in ensuring that the components on the cover plate do not interfere with each other and ensuring the integrated function of the cover plate, achieving high integration of the three functions of sealing, contact finger installation and grounding bar installation to ensure the safe operation of the grounding switch, while having the beneficial effect of a smaller volume.

[0008] Further improvement, the bolt shank of the bolt is sleeved with an insulating sleeve, and an insulating pad is arranged between the bolt head and the plate body to achieve insulation isolation between the bolt and the cover plate.

[0009] The beneficial effects are: the bolts are used to connect the flange and the shell, the distance between the bolts and the center of the cover plate is large, the diameter of the mounting hole can be increased to reduce the volume of the shell, the height of the grounding protrusion protruding from the plate body is greater than the height of the bolt head from the plate body, avoiding interference between the screw head and the grounding bar.

[0010] As a further improvement, the outer edge of the plate body is fixed to the shell by bolts, the bolt shank of the bolt is sleeved with an insulating sleeve, and an insulating pad is provided between the bolt head and the plate body to achieve insulation isolation between the bolt and the cover plate.

[0011] The beneficial effect is that the shell and the cover plate are connected by bolts, the structure is simple, and it is easy to install or disassemble.

[0012] As a further improvement, the shell has a convex ring arranged at the mounting hole and coaxial with the mounting hole, the outer edge of the plate body is fixed on the end face of the convex ring, and the grounding bar is fixed on the outer peripheral surface of the convex ring.

[0013] The beneficial effect is that, with such a design, the grounding bar and the cover plate are respectively connected to different positions of the shell, no interference occurs, and the structure is more compact.

[0014] As a further improvement, the cover plate is integrally formed by casting.

[0015] The beneficial effects are: such a design simplifies processing and reduces the number of assembly times.

[0016] According to a further improvement, the inner opening of the jack is flush with the inner opening of the mounting hole.

[0017] The beneficial effect is that with such a design, the volume of the cover plate is small, and interference between the cover plate and other parts in the shell is avoided.

[0018] As a further improvement, sealing rings are provided between the insulating plate and the shell, and between the insulating plate and the plate body.

[0019] The beneficial effect is that such a design prevents external dust or water vapor from entering the housing, thereby affecting the performance of the grounding switch.

[0020] According to a further improvement, the moving contact is a conductive rod.

[0021] The beneficial effect is that with such a design, the structure of the moving contact is simple and easy to process.

[0022] As a further improvement, the cover plate is provided with a supporting protrusion for externally connecting the supporting legs, and the supporting protrusion is arranged on a side of the plate body facing away from the mounting hole and protrudes outwardly away from the mounting hole.

[0023] The beneficial effect is that: with such a design, the shell can be supported by the supporting protrusions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the static end structure of the grounding switch for GIS of the present invention;

[0025] Figure 2 for Figure 1 Right view of;

[0026] In the figure: 11, shell; 12, plate; 13, grounding bar; 14, insulating plate; 15, contact finger; 16, insulating pad; 17, insulating sleeve; 18, sealing ring; 19, grounding protrusion; 20, supporting protrusion; 21, conductive sleeve; 22, convex ring; 23, mounting hole; 24, jack. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0029] It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, elements defined by the sentence "including a...", etc., do not exclude processes and methods that include the elements.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The present invention is further described in detail below in conjunction with embodiments.

[0033] Embodiment 1 of the grounding switch for GIS of the present invention:

[0034] The GIS grounding switch of the present invention is applicable to GIS equipment of ultra-high voltage power stations. Figure 1 As shown, the GIS grounding switch includes a housing 11 having a mounting hole 23, a static end structure fixed at the mounting hole 23, and a moving contact (not shown) located in the housing 11. The housing 11 has a convex ring 22 provided at the mounting hole 23 and coaxial with the mounting hole 23. In this embodiment, the moving contact is a conductive rod.

[0035] In this embodiment, Figure 1As shown, the static end structure includes a cover plate and a grounding bar 13, the cover plate is cast in one piece, the cover plate includes a plate body 12 outside the housing 11 and a conductive sleeve 21 on the side of the plate body 12 facing the mounting hole 23, the conductive sleeve 21 extends along the axial direction of the mounting hole 23 and is installed in the mounting hole 23. In other embodiments, the cover plate is made by machining.

[0036] In this embodiment, Figure 1 and Figure 2 As shown, the inner hole of the conductive sleeve 21 forms a socket 24 for inserting the moving contact, and two contact fingers 15 common to the product are installed on the inner wall of the socket 24. The static end structure conducts electricity with the moving contact through the contact fingers 15 on the cover plate. The inner opening of the socket 24 is flush with the inner opening of the mounting hole 23 to prevent the conductive sleeve 21 from interfering with other parts in the housing 11. In addition, the opening of the socket 24 for the moving contact to extend into is chamfered to facilitate the insertion of the moving contact into the socket.

[0037] In this embodiment, Figure 1 and Figure 2 As shown, the side of the plate body 12 away from the mounting hole 23 has a grounding protrusion 19 protruding outward away from the mounting hole, one end of the grounding bar 13 is fixed to the grounding protrusion 19 by bolts, and the other end of the grounding bar 13 is fixed to the outer peripheral surface of the protruding ring 22 by bolts. A support protrusion 20 is provided on the plate body 12 at a position opposite to the grounding protrusion 19, and the support protrusion 20 is used to externally connect the support leg.

[0038] In this embodiment, Figure 1 and Figure 2 As shown, the outer edge of the plate body 12 is fixed to the end surface of the convex ring 22 by bolts, and the grounding bar 13 and the cover plate are respectively connected to different positions of the housing 11, so that the structure of the GIS grounding switch is more compact; an insulating sleeve 17 is sleeved on the bolt rod of the bolt, and an insulating pad 16 is provided between the bolt head and the plate body 12 to achieve insulation isolation between the bolt and the cover plate and the housing 11. Among them, the distance between the bolt and the center of the cover plate is greater than the distance between the grounding protrusion 19 and the center of the cover plate, so as to reduce the volume of the housing 11 and increase the inner diameter of the mounting hole 23, thereby ensuring the installation space of the cover plate. In addition, an insulating plate 14 is provided between the plate body 12 and the convex ring 22 to achieve insulation between the plate body 12 and the housing 11. The insulating plate 14 has a simple structure, is easy to process, and has a low cost. Among them, a sealing ring 18 is installed between the insulating plate 14 and the convex ring 22, and between the insulating plate 14 and the plate body 12 to prevent dust or water vapor in the external environment from entering the housing 11, thereby affecting the performance of the GIS grounding switch. In this embodiment, the insulating plate 14 is an epoxy glass cloth laminate.

[0039] The main circuit of the GIS grounding switch of the present invention is moving contact → contact finger → cover plate → grounding bar → housing. The cover plate integrates the static contact seat, which can realize the functions of sealing, contact finger installation and grounding bar installation, so that the product has a high degree of integration. After the static contact seat is integrated into the cover plate, the cover plate can be insulated from the housing by an insulating plate. Compared with the cast epoxy resin insulator in the prior art, the insulating plate structure is simpler and the cost is lower. Compared with the smaller-sized mounting holes on the housing in the prior art, the size of the mounting hole on the housing of the grounding switch of the present invention can be appropriately increased, and then the normal-sized contact fingers can be used, thereby improving the ability of the static end to withstand short-circuit current.

[0040] Since the cover plate of the static end structure is equipped with contact fingers, the static end structure conducts electricity with the moving contact through the contact fingers on the cover plate, and the moving contact no longer has a contact finger seat and contact fingers, the structure of the moving contact is greatly simplified, and the technical problem of the relatively complex structure of the moving contact in the prior art is solved. The cover plate and the housing are insulated and isolated by an insulating plate, and the insulating plate has a simple structure and lower cost, which solves the technical problem that the static contact needs to be cast with epoxy resin insulators to achieve insulation between the static contact and the housing in the prior art, and the epoxy resin process is complicated and the cost is high.

[0041] Embodiment 2 of the grounding switch for GIS of the present invention:

[0042] The difference between this embodiment and embodiment 1 is that in this embodiment, no grounding protrusion is provided on the plate body, the grounding bar is fixed on the side of the plate body away from the mounting hole, and the plate body is provided with a countersunk hole for the bolt head of the connecting bolt between the outer edge of the plate body and the boss.

[0043] Embodiment 3 of the grounding switch for GIS of the present invention:

[0044] The difference between this embodiment and embodiment 1 is that in this embodiment, the distance between the bolt and the center of the cover plate is less than the distance between the grounding protrusion and the center of the cover plate. In other embodiments, the distance between the bolt and the center of the cover plate is equal to the distance between the grounding protrusion and the center of the cover plate, and the grounding protrusion and the bolt are distributed at different circumferential positions.

[0045] Embodiment 4 of the grounding switch for GIS of the present invention:

[0046] The difference between this embodiment and embodiment 1 is that in this embodiment, the structure corresponding to the mounting hole position on the shell is a flat plate, the flat plate extends radially along the mounting hole, and the outer edge of the plate body and the grounding bar are fixed on the outer surface of the flat plate.

[0047] Embodiment 5 of the grounding switch for GIS of the present invention:

[0048] The difference between this embodiment and embodiment 1 is that in this embodiment, the inner opening of the plug hole is higher than the inner opening of the mounting hole.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grounding switch for GIS, comprising a housing having a mounting hole; characterized in that: The invention also includes a static end structure fixed at the mounting hole and a moving contact located in the shell, the static end structure includes a cover plate and a grounding row, the cover plate includes a plate body outside the shell and a conductive sleeve on the side of the plate body facing the mounting hole and extending into the shell, the cover plate and the conductive sleeve are an integrated structure, the outer edge of the plate body is detachably fixed to the shell, and an insulating plate is provided between the outer edge of the plate body and the shell, the conductive sleeve extends into the mounting hole, the inner hole of the conductive sleeve forms a socket for the moving contact to be inserted, and a contact finger is installed on the inner wall of the socket, the static end structure is electrically conductive with the moving contact through the contact finger on the cover plate, and the grounding row is connected to the moving contact through the contact finger on the cover plate. The two ends of the row are conductively connected to the cover plate and the shell respectively, and the side of the plate body facing away from the mounting hole has a grounding protrusion protruding outwardly away from the mounting hole, and the grounding row is fixed on the grounding protrusion. The outer edge of the plate body is fixed to the shell by bolts, and the distance between the bolt and the center of the cover plate is greater than the distance between the grounding protrusion and the center of the cover plate. The height of the grounding protrusion protruding from the plate body is greater than the height of the bolt head from the plate body. The shell has a convex ring arranged at the mounting hole and coaxial with the mounting hole, the outer edge of the plate body is fixed to the end face of the convex ring, and the grounding row is fixed to the outer peripheral surface of the convex ring.

2. The GIS grounding switch according to claim 1, characterized in that: The bolt shank of the bolt is sheathed with an insulating sleeve, and an insulating pad is arranged between the bolt head and the plate body to achieve insulation isolation between the bolt and the cover plate.

3. The GIS grounding switch according to claim 1, characterized in that: The outer edge of the plate body is fixed to the shell body by bolts, the bolt shank of the bolt is sleeved with an insulating sleeve, and an insulating pad is arranged between the bolt head and the plate body to achieve insulation isolation between the bolt and the cover plate.

4. The GIS grounding switch according to claim 1 or 2, characterized in that: The cover plate is integrally formed by casting.

5. The GIS grounding switch according to claim 1 or 2, characterized in that: The inner opening of the insertion hole is flush with the inner opening of the mounting hole.

6. The GIS grounding switch according to claim 1 or 2, characterized in that: Sealing rings are provided between the insulating plate and the shell, and between the insulating plate and the plate body.

7. The GIS grounding switch according to claim 1 or 2, characterized in that: The moving contact is a conductive rod.

8. The GIS grounding switch according to claim 1 or 2, characterized in that: The cover plate is provided with a supporting protrusion for externally connecting the supporting legs. The supporting protrusion is arranged on a side of the plate body facing away from the mounting hole and protrudes outwardly away from the mounting hole.

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