Static contact structure for high-voltage switch cabinet

Abstract

The invention discloses a static contact structure for a high-voltage switch cabinet, and belongs to the technical field of static contacts. The static contact structure comprises a static contact body, a magnet assembly and a control assembly. A copper layer is arranged on the peripheral wall of one end of the static contact body; the magnet assembly comprises a permanent magnet and an electromagnet which are matched with each other, the permanent magnet is coaxially fixed at the other end of the static contact body, and the electromagnet is used for being fixed on a high-voltage switch cabinet; the control assembly comprises a temperature sensor, a controller, a locking piece, an elastic piece and a heat insulation telescopic handle, the temperature sensor, the controller, the locking piece and the elastic piece are all inserted into the static contact body, the controller is electrically connected with the temperature sensor and the locking piece, and the heat insulation telescopic handle is slidably inserted into the static contact body. According to the static contact structure for the high-voltage switch cabinet provided by the embodiment of the invention, the service life can be greatly prolonged by arranging the copper layer, and the static contact body can be quickly replaced at a high temperature.

Description

Technical Field

[0001] The invention belongs to the technical field of static contacts, and in particular relates to a static contact structure for a high-voltage switch cabinet. Background Art

[0002] The static contact is mounted on the high-voltage switchgear, while the annular plum blossom contact is mounted on the end of the moving contact. The moving contact, with the plum blossom contact, is then mounted on the circuit breaker. Pushing the circuit breaker into the high-voltage switchgear allows the plum blossom contact to mount on the end of the static contact, creating an electrical connection between the moving and static contacts.

[0003] However, the corrosion resistance and electrical conductivity of existing static contact structures significantly decrease after prolonged use, significantly reducing their service life. Furthermore, static contact structures can heat up after prolonged use or under overload conditions, which can reduce their electrical conductivity (or even burn them out). Furthermore, static contacts are typically bolted to the high-voltage switchgear, making them difficult to quickly replace. Summary of the Invention

[0004] In response to the above defects or improvement needs of the prior art, the present invention provides a static contact structure for a high-voltage switchgear, the purpose of which is not only to greatly extend the service life by setting a copper layer, but also to achieve rapid replacement of the static contact body at high temperatures.

[0005] To achieve the above object, the present invention provides a static contact structure for a high-voltage switchgear, the static contact structure comprising a static contact body, a magnet assembly and a control assembly; A copper layer is provided on the outer peripheral wall of one end of the static contact body; The magnet assembly includes a permanent magnet and an electromagnet that match each other, the permanent magnet is coaxially fixed on the other end of the static contact body, and the electromagnet is used to be fixed on the high-voltage switch cabinet; The control component includes a temperature sensor, a controller, a locking piece, an elastic piece and an insulated telescopic handle. The temperature sensor, the controller, the locking piece and the elastic piece are all inserted into the static contact body. The controller is electrically connected to the temperature sensor and the locking piece respectively. The insulated telescopic handle is slidably inserted into the static contact body. The output end of the locking piece is used to lock the insulated telescopic handle in the static contact body, and the elastic piece is clamped between the insulated telescopic handle and the static contact body. The control component is configured so that when the temperature sensor detects that the temperature of the static contact body exceeds a threshold value, the controller controls the locking piece to release the lock of the insulated telescopic handle according to the signal transmitted by the temperature sensor, and one end of the insulated telescopic handle extends out of the static contact body.

[0006] Optionally, the locking member is a finger cylinder, and two output ends of the finger cylinder are used to clamp the thermal insulation telescopic handle.

[0007] Optionally, the locking member is a piston cylinder, a positioning hole is provided on the thermally insulated telescopic handle, and a piston rod of the piston cylinder can be movably inserted into the positioning hole.

[0008] Optionally, a first through hole is coaxially provided in the axial direction of the static contact body.

[0009] Optionally, the static contact body is provided with a plurality of second through holes arranged at intervals in the radial direction, and each of the second through holes is communicated with the first through hole.

[0010] Optionally, the copper layer has a thickness greater than 100 um.

[0011] Optionally, the bonding strength between the copper layer and the static contact body is greater than 50 MPa.

[0012] Optionally, the outer peripheral wall of one end of the static contact body is an inclined surface, and the outer diameter of the inclined surface gradually increases from one end of the static contact body to the other end of the static contact body, and one end of the inclined surface extends to one end surface of the static contact body, and the other end of the inclined surface extends to the copper layer.

[0013] Optionally, the axial length of the static contact body is 50-60 mm.

[0014] Optionally, the copper layer is bonded to the outer peripheral wall of the static contact body by cold spraying.

[0015] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art: Regarding the static contact structure for a high-voltage switch cabinet provided in an embodiment of the present invention, when installing the static contact, first, fix the electromagnet on the high-voltage electric control cabinet. Then, insert the static contact body into the plum blossom contact of the circuit breaker (at this time, the thermally insulated telescopic handle is recovered in the static contact body, and the overall volume is small, which is convenient for installing the static contact body; in addition, the copper layer is in contact with the plum blossom contact), and push the circuit breaker close to the electromagnet. Finally, the high-voltage electric control cabinet is energized, and the strong magnetic field generated by the electromagnet forms a magnetic attraction with the permanent magnet, thereby realizing the rapid fixation of the static contact body on the high-voltage electric control cabinet. At the same time, the current of the high-voltage electric control cabinet is transmitted to the circuit breaker after passing through the electromagnet, the permanent magnet, the static contact body and the plum blossom contact. Since a copper layer is provided on the outer peripheral wall of one end of the static contact body, the copper layer can improve the corrosion resistance and conductivity of the static contact body (the static contact body is usually an aluminum structure) while conducting electricity, thereby extending its service life and solving the problem that the corrosion resistance and conductivity of the static contact will decrease significantly after long-term use.

[0017] Furthermore, when the temperature sensor detects that the temperature of the static contact body exceeds a threshold, the controller controls the locking member to unlock the thermally insulated telescopic handle based on the signal transmitted by the temperature sensor. The compressed elastic member then pushes the thermally insulated telescopic handle outward, causing one end of the thermally insulated telescopic handle to extend beyond the static contact body. Thereafter, the high-voltage electrical control cabinet can be manually powered off. Correspondingly, the strong magnetic field generated by the electromagnet disappears, and the electromagnet and permanent magnet separate, releasing the static contact body from the high-voltage electrical control cabinet. Thereafter, the static contact body can be manually grasped and removed from the plum blossom contact. The above steps can be repeated to replace the static contact body. Due to its inherent thermal insulation properties, the thermally insulated telescopic handle remains much cooler than the static contact body, preventing burns. At this point, the static contact body can be manually removed, avoiding a long wait for the static contact body to cool down. This significantly shortens the time required for disassembly and installation of the static contact body, ultimately enabling rapid replacement of the static contact body.

[0018] That is, the static contact structure for a high-voltage switchgear provided by the embodiment of the present invention can not only greatly extend the service life by providing a copper layer, but also realize the rapid replacement of the static contact body at high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a static contact structure for a high-voltage switchgear provided by an embodiment of the present invention; Figure 2 The figure is a cross-sectional view of a static contact structure for a high-voltage switchgear provided by an embodiment of the present invention.

[0020] In all the drawings, the same reference numerals represent the same technical features, specifically: 1. Static contact body; 11. Copper layer; 12. First through hole; 13. Second through hole; 14. Inclined surface; 2. Magnet assembly; 21. Permanent magnet; 22. Electromagnet; 3. Control assembly; 31. Temperature sensor; 32. Locking member; 33. Elastic member; 34. Insulated telescopic handle. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0026] Example: Figure 1 1 is a structural diagram of a static contact structure for a high-voltage switchgear provided by an embodiment of the present invention. Figure 2 This is a cross-sectional view of a static contact structure for a high-voltage switchgear provided by an embodiment of the present invention, combined with Figure 1 and Figure 2 As shown, the static contact structure includes a static contact body 1 , a magnet assembly 2 and a control assembly 3 .

[0027] A copper layer 11 is provided on the outer peripheral wall of one end of the static contact body 1 .

[0028] The magnet assembly 2 includes a permanent magnet 21 and an electromagnet 22 that match each other. The permanent magnet 21 is coaxially fixed to the other end of the static contact body 1, and the electromagnet 22 is used to be fixed to the high-voltage switch cabinet.

[0029] The control component 3 includes a temperature sensor 31, a controller (not shown), a locking piece 32, an elastic piece 33 and an insulated telescopic handle 34. The temperature sensor 31, the controller, the locking piece 32 and the elastic piece 33 are all inserted into the static contact body 1. The controller is electrically connected to the temperature sensor 31 and the locking piece 32 respectively. The insulated telescopic handle 34 is slidably inserted into the static contact body 1. The output end of the locking piece 32 is used to lock the insulated telescopic handle 34 in the static contact body 1, and the elastic piece 33 is clamped between the insulated telescopic handle 34 and the static contact body 1. The control component 3 is configured such that when the temperature sensor 31 detects that the temperature of the static contact body 1 exceeds a threshold value (for example, 90°C), the controller controls the locking piece 32 to release the lock of the insulated telescopic handle 34 according to the signal transmitted by the temperature sensor 31, and one end of the insulated telescopic handle 34 extends out of the static contact body 1.

[0030] Regarding the static contact structure for a high-voltage switch cabinet provided in an embodiment of the present invention, when installing the static contact, first, fix the electromagnet 22 on the high-voltage electric control cabinet. Then, insert the static contact body 1 on the plum blossom contact of the circuit breaker (at this time, the thermally insulated telescopic handle 34 is recovered in the static contact body 1, and the overall volume is small, which is convenient for installing the static contact body 1; in addition, the copper layer 11 is in contact with the plum blossom contact), and push the circuit breaker close to the electromagnet 22. Finally, the high-voltage electric control cabinet is energized, and the strong magnetic field generated by the electromagnet 22 forms a magnetic attraction with the permanent magnet 21, thereby realizing the rapid fixation of the static contact body 1 on the high-voltage electric control cabinet. At the same time, the current of the high-voltage electric control cabinet is transmitted to the circuit breaker after passing through the electromagnet 22, the permanent magnet 21, the static contact body 1 and the plum blossom contact. Since a copper layer 11 is provided on the outer peripheral wall of one end of the static contact body 1, the copper layer 11 can improve the corrosion resistance and conductivity of the static contact body 1 (the static contact body 1 is usually an aluminum structure) while conducting electricity, thereby extending its service life and solving the problem that the corrosion resistance and conductivity of the static contact will significantly decrease after long-term use.

[0031] Furthermore, when the temperature sensor 31 detects that the temperature of the static contact body 1 exceeds the threshold value, the controller controls the locking member 32 to release the lock of the thermal insulation telescopic handle 34 according to the signal transmitted by the temperature sensor 31, and the compressed elastic member 33 will push the thermal insulation telescopic handle 34 outward, so that one end of the thermal insulation telescopic handle 34 extends out of the static contact body 1. After that, the high-voltage electric control cabinet can be manually powered off. Correspondingly, the strong magnetic field generated by the electromagnet 22 when it is energized disappears, and the electromagnet 22 and the permanent magnet 21 are separated, thereby releasing the fixation of the static contact body 1 on the high-voltage electric control cabinet. After that, manually hold the thermal insulation telescopic handle 34 and remove the static contact body 1 from the plum blossom contact, and repeat the above steps to replace the static contact body 1. Due to its own thermal insulation performance, the temperature of the insulated telescopic handle 34 is much lower than that of the static contact body 1, preventing burns. At this time, the static contact body 1 can be removed manually to avoid waiting for a long time to cool down, greatly shortening the time for disassembly and installation of the static contact body 1, thereby ultimately achieving rapid replacement of the static contact body 1.

[0032] That is, the static contact structure for a high-voltage switchgear provided by the embodiment of the present invention can not only greatly extend the service life by providing the copper layer 11, but also realize the rapid replacement of the static contact body 1 at high temperature.

[0033] Illustratively, the control assembly 3 also includes an alarm, which is electrically connected to the controller. Specifically, when the temperature sensor 31 detects that the temperature of the static contact body 1 exceeds a threshold, the controller not only activates the locking member 32 to extend the thermally insulated retractable handle 34, but also controls the alarm to warn of an abnormal temperature in the static contact body 1, prompting a technician to promptly power off and replace the static contact body 1.

[0034] For example, the elastic member 33 can be a spring. The magnet assembly 2 is a conductive structure. In addition, the elastic member 33, the locking member 32 and the heat-insulating telescopic handle 34 are all installed in the installation groove of the static contact body 1.

[0035] It's easy to understand that the copper layer 11 provides excellent electrical conductivity and contact area, while also improving current transmission efficiency and reducing contact resistance, helping to reduce heat generation and extend the service life of the static contact body 1. The copper layer 11 also has a high wear resistance, meeting the requirement of 8,000-10,000 plug-in cycles, eliminating issues such as surface wear on the static contact body 1 and ensuring the long-term safe operation of the static contact body 1.

[0036] In addition, the copper layer 11 is provided only on the local portion of the static contact body 1 corresponding to the plum blossom contact, which can reduce the use of copper material and lower the cost.

[0037] In this embodiment, the thickness of the copper layer 11 is greater than 100 μm. Furthermore, the bonding strength between the copper layer 11 and the static contact body 1 is greater than 50 MPa, thereby preventing the copper layer 11 from falling off and ensuring the reliability of the copper layer 11 installed outside the static contact body 1.

[0038] Illustratively, the copper layer 11 is bonded to the outer peripheral wall of the static contact body 1 by cold spraying, thereby ensuring that there is no gap in the bonding cross section and avoiding the risk of electrochemical corrosion.

[0039] In one implementation of the present invention, the locking member 32 can be a finger cylinder, whose two output ends are used to clamp the thermally insulated telescopic handle 34. Specifically, at low temperatures, the finger cylinder can clamp and secure the thermally insulated telescopic handle 34 within the static contact body 1, facilitating installation of the static contact body 1. At high temperatures, the finger cylinder releases the thermally insulated telescopic handle 34, allowing the elastic force of the elastic member 33 to extend the handle 34, facilitating manual gripping.

[0040] In another embodiment of the present invention, the locking member 32 can be a piston cylinder. The thermally insulated telescopic handle 34 is provided with a positioning hole, into which the piston rod of the piston cylinder can be movably inserted. Similarly, at low temperatures, the piston cylinder's piston rod inserted into the positioning hole secures the thermally insulated telescopic handle 34 within the static contact body 1, facilitating installation of the static contact body 1. At high temperatures, the piston cylinder releases the securing of the thermally insulated telescopic handle 34, and the elastic force of the elastic member 33 drives the thermally insulated telescopic handle 34 out, facilitating manual gripping.

[0041] It should be noted that, in other embodiments of the present invention, the heat-insulating telescopic handle 34 may be pushed onto the inner wall of the static contact body 1 by the piston rod of the piston cylinder to achieve fixation.

[0042] Continue to see Figure 1 and Figure 2 A first through hole 12 is coaxially provided in the axial direction of the static contact body 1. The first through hole 12 can realize rapid heat dissipation of the static contact body 1, thereby avoiding the problem of overheating and burning of the static contact.

[0043] Furthermore, the static contact body 1 is provided with a plurality of second through holes 13 arranged at intervals in the radial direction, and each second through hole 13 is connected to the first through hole 12 . The second through holes 13 can further dissipate heat.

[0044] In this embodiment, the outer peripheral wall of one end of the static contact body 1 is an inclined surface 14. The outer diameter of the inclined surface 14 gradually increases from one end of the static contact body 1 to the other end of the static contact body 1, and one end of the inclined surface 14 extends to one end surface of the static contact body 1, and the other end of the inclined surface 14 extends to the copper layer 11. The inclined surface 14 facilitates the rapid insertion of the static contact body 1 into the plum blossom contact.

[0045] In addition, the axial length of the static contact body 1 is 50-60 mm. Preferably, the axial length of the static contact body 1 is 54 mm, which can effectively improve the mechanical strength of the static contact body 1 and ensure the current-carrying capacity of the static contact.

[0046] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A static contact structure for a high-voltage switchgear, characterized in that: The static contact structure comprises a static contact body (1), a magnet assembly (2) and a control assembly (3); A copper layer (11) is provided on the outer peripheral wall of one end of the static contact body (1); The magnet assembly (2) comprises a permanent magnet (21) and an electromagnet (22) that match each other, the permanent magnet (21) being coaxially fixed to the other end of the static contact body (1), and the electromagnet (22) being used to be fixed to a high-voltage switch cabinet; The control assembly (3) includes a temperature sensor (31), a controller, a locking member (32), an elastic member (33) and a heat-insulating telescopic handle (34). The temperature sensor (31), the controller, the locking member (32) and the elastic member (33) are all inserted into the static contact body (1). The controller is electrically connected to the temperature sensor (31) and the locking member (32) respectively. The heat-insulating telescopic handle (34) is slidably inserted into the static contact body (1). The output end of the locking member (32) is used to lock the heat-insulating telescopic handle (34). The telescopic handle (34) is inside the static contact body (1), and the elastic member (33) is sandwiched between the thermally insulated telescopic handle (34) and the static contact body (1). The control component (3) is configured such that when the temperature sensor (31) detects that the temperature of the static contact body (1) exceeds a threshold value, the controller controls the locking member (32) to release the locking of the thermally insulated telescopic handle (34) according to a signal transmitted by the temperature sensor (31), and one end of the thermally insulated telescopic handle (34) extends out of the static contact body (1).

2. A static contact structure for a high-voltage switch cabinet according to claim 1, characterized in that: The locking member (32) is a finger cylinder, and the two output ends of the finger cylinder are used to clamp the heat-insulating telescopic handle (34).

3. The static contact structure for a high-voltage switch cabinet according to claim 1, characterized in that: The locking member (32) is a piston cylinder, and a positioning hole is provided on the heat-insulating telescopic handle (34), and a piston rod of the piston cylinder can be movably inserted into the positioning hole.

4. The static contact structure for a high-voltage switch cabinet according to claim 1, characterized in that: A first through hole (12) is coaxially provided on the axial direction of the static contact body (1).

5. The static contact structure for a high-voltage switch cabinet according to claim 4, characterized in that: The static contact body (1) is provided with a plurality of second through holes (13) arranged at intervals in the radial direction, and each of the second through holes (13) is communicated with the first through hole (12).

6. The static contact structure for a high-voltage switch cabinet according to claim 1, characterized in that: The thickness of the copper layer (11) is greater than 100 μm.

7. The static contact structure for a high-voltage switch cabinet according to claim 1, characterized in that: The bonding strength between the copper layer (11) and the static contact body (1) is greater than 50 MPa.

8. The static contact structure for a high-voltage switch cabinet according to claim 1, characterized in that: The outer peripheral wall of one end of the static contact body (1) is an inclined surface (14), and the outer diameter of the inclined surface (14) gradually increases from one end of the static contact body (1) to the other end of the static contact body (1), and one end of the inclined surface (14) extends to an end surface of one end of the static contact body (1), and the other end of the inclined surface (14) extends to the copper layer (11).

9. The static contact structure for a high-voltage switch cabinet according to claim 1, characterized in that: The axial length of the static contact body (1) is 50-60 mm.

10. A static contact structure for a high-voltage switchgear according to any one of claims 1 to 8, characterized in that: The copper layer (11) is bonded to the outer peripheral wall of the static contact body (1) by cold spraying.

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