Disconnector and switchgear

Abstract

This utility model belongs to the field of power system technology and discloses a disconnecting switch and switchgear. The disconnecting switch is installed on the cabinet of the switchgear, which contains a busbar and a grounding bar. The disconnecting switch includes an operating rod, a conductive rod, and a transmission assembly. The operating rod slides through the cabinet, and the conductive rod slides on the inner cone of the voltage transformer. Pushing or pulling the operating rod moves the conductive rod, which in turn moves the conductive rod through the transmission assembly. This allows the conductive rod to connect with the busbar via a pin to achieve closing or with the grounding bar to achieve opening. By setting pins at both ends of the conductive rod and an elastic element between the conductive rod and the pins, the pins connect with the busbar or grounding bar under the action of the elastic element. This ensures a tight connection and also disperses the charge to reduce the charge density at the tip, thereby reducing the possibility of tip discharge and effectively improving the stability of the disconnecting switch in the power system.

Description

Technical Field

[0001] This utility model relates to the field of power system technology, and in particular to a disconnecting switch and switch cabinet. Background Technology

[0002] Voltage transformers (PTs) are commonly used components in switchgear. They convert voltage in high-voltage systems to voltage in low-voltage systems for measurement and monitoring. During maintenance and repair, it is necessary to control the connection and disconnection of the busbar and voltage transformer. Specifically, the voltage transformer is connected to the busbar when needed and disconnected when not needed.

[0003] In the existing technology, direct-acting PT disconnectors are used to isolate voltage transformers from the power system to achieve opening and closing. The ends of direct-acting PT disconnectors are equipped with springs and need to be connected to the busbar through the springs. The contact position of the spring is a sharp point, which has poor stability in the power system and is prone to point discharge.

[0004] That is, the existing direct-acting PT deflector, which is connected to the busbar via a spring, has the disadvantages of poor stability and is prone to tip discharge. Utility Model Content

[0005] The purpose of this invention is to provide a disconnecting switch and switch cabinet to improve the stability of direct-acting PT disconnectors in power systems and reduce the possibility of tip discharge.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a disconnecting switch for installation on the cabinet of a switchgear, wherein the cabinet is provided with a busbar and a grounding busbar, and the disconnecting switch includes:

[0008] An operating lever, which slides through the cabinet body;

[0009] A conductive rod is slidably disposed within the inner cone of a voltage transformer located inside the cabinet. Both ends of the conductive rod are provided with pins, and an elastic element is provided between the pins and the conductive rod.

[0010] A transmission assembly is located inside the cabinet. The transmission assembly connects the operating rod and the conductive rod. The movement of the operating rod drives the conductive rod to move through the transmission assembly, so that the first end of the conductive rod is connected to the busbar through the pin to close the circuit, or the second end of the conductive rod is connected to the grounding busbar through the pin to open the circuit.

[0011] As an optional technical solution for a disconnecting switch, the conductive rod includes a main rod and two sheaths. The main rod is slidably disposed within the inner cone of the voltage transformer. Both ends of the main rod are respectively connected to one of the sheaths. The elastic element is located inside the sheath and disposed between the main rod and the ejector pin. The sheath has an opening, and the ejector pin passes through the opening and is located outside the sheath.

[0012] As an optional technical solution for disconnecting switches, the main rod is provided with guide cylinders at both ends. The guide cylinders are inserted into the sheath and fixedly connected to the sheath. The elastic element is sleeved on the pin and is disposed between the pin and the guide cylinder. The pin portion slides through the guide cylinder.

[0013] As an optional technical solution for a disconnecting switch, the sheath has an inner top wall with the opening on the inner top wall, and the ejector pin has a radially protruding stop ring. One side of the stop ring cooperates with the inner top wall to restrict the ejector pin from disengaging from the sheath, and the elastic element is located on the other side of the stop ring.

[0014] As an optional technical solution for disconnecting switches, the end of the pin located outside the sheath has a hemispherical surface, and the pin is connected to the busbar or the grounding busbar through the hemispherical surface.

[0015] As an optional technical solution for a disconnecting switch, the disconnecting switch further includes an actuating rod, an operating handle, and a housing. The housing is fixed to the cabinet, and the actuating rod is rotatably mounted on the housing. One end of the actuating rod is threadedly connected to the operating rod, and the other end of the actuating rod is drively connected to the operating handle. Rotation of the operating handle drives the actuating rod to rotate, and rotation of the actuating rod drives the operating rod to move.

[0016] As an optional technical solution for disconnecting switches, the housing is located outside the cabinet, and the connection between the actuating rod and the operating rod is located inside the housing.

[0017] As an optional technical solution for the disconnecting switch, the disconnecting switch further includes a fixed bracket, which is disposed inside the housing, and the actuating rod passes through the fixed bracket and is rotatably connected to the fixed bracket.

[0018] As an optional technical solution for disconnecting switches, the portion of the actuating rod located outside the cabinet is situated inside the housing. The housing is provided with a socket, and the operating handle passes through the socket and is connected to the actuating rod.

[0019] This utility model provides a switch cabinet, including a cabinet body, a busbar, a grounding busbar, an inner cone of a voltage transformer, and the aforementioned disconnecting switch.

[0020] Beneficial effects:

[0021] This utility model provides a disconnecting switch for installation on the cabinet of a switchgear. The cabinet contains a busbar and a grounding bar. The disconnecting switch includes an operating rod, a conductive rod, and a transmission assembly. The operating rod slides through the cabinet, and the conductive rod slides on the inner cone of a voltage transformer located inside the cabinet. Both ends of the conductive rod are provided with pins, and an elastic element is provided between the pins and the conductive rod. The transmission assembly is located inside the cabinet and connects the operating rod and the conductive rod. The movement of the operating rod drives the conductive rod to move through the transmission assembly, so that the first end of the conductive rod is connected to the busbar through the pin to close the circuit, or the second end of the conductive rod is connected to the grounding bar through the pin to open the circuit. The push-pull operation lever moves the conductive rod via a transmission assembly, allowing it to connect to the busbar via a pin for closing or to the grounding busbar for opening. Pins are installed at both ends of the conductive rod, with an elastic element between them. The pins connect to the busbar or grounding busbar under the action of the elastic element, ensuring a tight connection and dispersing charge to reduce tip charge density, thus lowering the possibility of tip discharge and effectively improving the stability of the disconnector in the power system.

[0022] This utility model provides a switch cabinet, including a cabinet body, busbars, grounding busbars, voltage transformer inner cones, and the aforementioned disconnecting switch. The disconnecting switch has good stability and a low probability of tip discharge, which helps to ensure the overall safety of the switch cabinet. Attached Figure Description

[0023] Figure 1 This is a partial structural schematic diagram of the disconnector switch in the closed state provided in an embodiment of this utility model;

[0024] Figure 2 This is a partial structural schematic diagram of the disconnector switch in the open state provided in an embodiment of this utility model;

[0025] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0026] Figure 4 This is a structural schematic diagram of the disconnector switch in the closed state provided in this embodiment of the utility model;

[0027] Figure 5 This is a partial structural schematic diagram of the disconnecting switch provided in an embodiment of this utility model.

[0028] In the picture:

[0029] 11. Operating rod; 12. Transmission assembly; 121. Base; 122. Swing rod; 123. Rotating shaft; 13. Conductive rod; 131. Main rod; 1311. Guide cylinder; 132. Sheath; 14. Ejector pin; 141. Stop ring; 15. Sealing structure; 16. Actuating rod; 17. Operating handle; 18. Housing; 19. Fixing bracket;

[0030] 20. Cabinet; 21. Busbar; 22. Grounding busbar; 23. Inner cone of voltage transformer. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] like Figures 1 to 5As shown, this embodiment provides a disconnecting switch and a switch cabinet. The switch cabinet includes a cabinet 20, a busbar 21, a grounding busbar 22, a voltage transformer inner cone 23, and a disconnecting switch. The disconnecting switch is installed on the cabinet 20 of the switch cabinet. The disconnecting switch includes an operating rod 11, a conductive rod 13, and a transmission assembly 12. The operating rod 11 slides through the cabinet 20, and the conductive rod 13 slides on the voltage transformer inner cone 23 located inside the cabinet 20. Both ends of the conductive rod 13 are provided with pins 14, and an elastic element is provided between the pins 14 and the conductive rod 13. The transmission assembly 12 is located inside the cabinet 20 and connects the operating rod 11 and the conductive rod 13. The movement of the operating rod 11 drives the movement of the conductive rod 13 through the transmission assembly 12, so that the first end of the conductive rod 13 is connected to the busbar 21 through the pins 14 to close the circuit, or the second end of the conductive rod 13 is connected to the grounding busbar 22 through the pins 14 to open the circuit.

[0036] The push-pull operation lever 11 moves the conductive rod 13 via the transmission assembly 12, thereby connecting the conductive rod 13 to the busbar 21 via the pin 14 to achieve closing or to the grounding busbar 22 to achieve opening. By setting pins 14 at both ends of the conductive rod 13 and setting an elastic element between the conductive rod 13 and the pins 14, the pins 14 are connected to the busbar 21 or the grounding busbar 22 under the action of the elastic element. This ensures a tight connection and also disperses the charge to reduce the charge density at the tip, thereby reducing the possibility of tip discharge and effectively improving the stability of the disconnecting switch in the power system. The disconnecting switch has good stability and a low possibility of tip discharge, which helps to ensure the overall safety of the switchgear.

[0037] Furthermore, the conductive rod 13 includes a main rod 131 and two sheaths 132. The main rod 131 is slidably disposed within the inner cone 23 of the voltage transformer. Each end of the main rod 131 is connected to a sheath 132. An elastic element is located within the sheath 132 and positioned between the main rod 131 and the ejector pin 14. The sheath 132 has an opening, and the ejector pin 14 partially passes through the opening and is positioned outside the sheath 132. By configuring the conductive rod 13 as a main rod 131 and sheaths 132, and fitting the sheath 132 onto the end of the main rod 131, the elastic element and the ejector pin 14 are fixed to the end of the main rod 131. The ejector pin 14 partially passes through the opening and is positioned outside the sheath 132. When the conductive rod 13 moves, the ejector pin 14 can contact the same busbar 21 or grounding busbar 22, and the elastic element acts as a buffer, achieving electrical connection.

[0038] Optionally, the end of the ejector pin 14 located outside the sheath 132 has a hemispherical surface, through which the ejector pin 14 is connected to the busbar 21 or the grounding busbar 22. By providing a hemispherical surface at the end of the ejector pin 14, and achieving electrical connection through point contact with the busbar 21 or the grounding busbar 22, the stability of the contact resistance can be ensured, thereby guaranteeing the efficiency and reliability of current transmission. Point contact can also optimize current distribution and reduce local overheating caused by uneven contact, thereby improving the overall stability and safety of the system. In this embodiment, the ejector pin 14 is made of a metal material with good conductivity, such as copper or aluminum.

[0039] Optionally, guide cylinders 1311 are provided at both ends of the main rod 131. The guide cylinders 1311 are inserted into the sheath 132 and fixedly connected to the sheath 132. An elastic element is sleeved on the ejector pin 14. The elastic element (not shown) is disposed between the ejector pin 14 and the guide cylinder 1311, and the ejector pin 14 partially slides through the guide cylinder 1311. In this embodiment, the guide cylinder 1311 is cylindrical; the elastic element is a spring. By providing guide cylinders 1311 at both ends of the main rod 131, utilizing the sliding engagement between the ejector pin 14 and the guide cylinder 1311, and sleeved on the outside of the ejector pin 14, the movement direction of the ejector pin 14 and the deformation direction of the elastic element can be effectively restricted. In this embodiment, the guide cylinder 1311 and the sheath 132 can be fixed by bolts or snap-fitting.

[0040] Furthermore, the sheath 132 has an inner top wall with an opening. The ejector pin 14 has a radially protruding stop ring 141. One side of the stop ring 141 cooperates with the inner top wall to prevent the ejector pin 14 from detaching from the sheath 132, and the elastic element is located on the other side of the stop ring 141. By having a radially protruding stop ring 141 on the ejector pin 14, with an elastic element on one side and the other side cooperating with the inner top wall of the sheath 132, the ejector pin 14 can be prevented from detaching from the sheath 132. Under the action of the elastic element, the ejector pin 14 partially passes through the opening and is placed outside the sheath 132. When the ejector pin 14 is compressed, it gradually retracts into the sheath 132 and squeezes the elastic element.

[0041] To accurately control the movement of the operating rod 11, the disconnect switch also includes an actuating rod 16, an operating handle 17, and a housing 18. The housing 18 is fixed to the cabinet 20, and the actuating rod 16 is rotatably mounted on the housing 18. One end of the actuating rod 16 is threadedly connected to the operating rod 11, and the other end of the actuating rod 16 is drive-connected to the operating handle 17. Rotating the operating handle 17 drives the actuating rod 16 to rotate, and rotating the actuating rod 16 drives the operating rod 11 to move.

[0042] By setting up an actuating lever 16 and an operating handle 17, and using the threaded connection between the actuating lever 16 and the operating straight lever 11, rotating the operating handle 17 drives the operating straight lever 11 through the actuating lever 16, which helps to ensure the controllability of the movement distance of the operating straight lever 11 and avoids the action being incomplete due to directly pushing or pulling the operating straight lever 11.

[0043] Optionally, the outer casing 18 is located outside the cabinet 20, and the connection between the actuating lever 16 and the operating rod 11 is located inside the outer casing 18. By providing the outer casing 18 on the cabinet 20, the connection between the actuating lever 16 and the operating rod 11 is protected by the outer casing 18, preventing impurities from entering and improving service life.

[0044] To improve the installation stability of the actuating rod 16, the disconnect switch also includes a fixing bracket 19. The fixing bracket 19 is disposed inside the housing 18, and the actuating rod 16 passes through the fixing bracket 19 and is rotatably connected to the fixing bracket 19. By setting the fixing bracket 19 inside the housing 18, the actuating rod 16 is rotatably connected to the fixing bracket 19, and the fixing bracket 19 can stably support the actuating rod 16, thereby cooperating with the operating rod 11 to accurately limit the movement direction of the actuating rod 16 and avoid incomplete operation due to misalignment of the actuating rod 16. In this embodiment, the housing 18 can be fixed to the cabinet 20 with bolts, and the fixing bracket 19 can also be fixed inside the housing 18 with bolts.

[0045] Optionally, the portion of the actuating lever 16 outside the cabinet 20 is located inside the outer casing 18. The outer casing 18 has a socket, through which the operating handle 17 passes and connects to the actuating lever 16. By placing the portion of the actuating lever 16 outside the cabinet 20 entirely within the outer casing 18, and providing a socket on the outer casing 18, the outer casing 18 can protect the connection point between the operating handle 17 and the actuating lever 16. In this embodiment, the operating handle 17 and the actuating lever 16 are detachably connected; specifically, a plug-in connection or similar method can be used, ensuring that the rotation of the operating handle 17 causes the actuating lever 16 to rotate synchronously.

[0046] In this embodiment, the disconnect switch further includes a sealing structure 15, and the operating rod 11 slides through the sealing structure 15. The sealing structure 15 is used to embed and fix it on the cabinet 20. By embedding and fixing the sealing structure 15 on the cabinet 20, the airtightness of the cabinet 20 is ensured. In this embodiment, the sealing structure 15 is annular and is a dynamic seal. A dynamic seal means that it can achieve a seal while the operating rod 11 is moving. The specific structure and materials of the dynamic seal can be set with reference to the prior art.

[0047] Specifically, the transmission assembly 12 includes a base 121, a swing rod 122, and a rotating shaft 123. The base 121 is fixed to the cabinet 20. The swing rod 122 is rotatably mounted on the base 121. The first end of the swing rod 122 is hinged to the operating rod 11, and the second end of the swing rod 122 is slidably connected to the conductive rod 13. The movement of the operating rod 11 drives the swing rod 122 to rotate, thereby pulling the conductive rod 13 to move. There are three conductive rods 13, and the swing rod 122 is arranged one-to-one with the conductive rod 13. Each swing rod 122 is fixedly connected to the rotating shaft 123 and rotatably mounted on the base 121 through the rotating shaft 123. The operating rod 11 connects to one of the swing rods 122 to drive one of the swing rods 122 and the rotating shaft 123 to rotate, and the rotation of the rotating shaft 123 drives the remaining swing rods 122 to rotate.

[0048] By setting three conductive rods 13 and corresponding swing rods 122 to correspond to the three-phase circuit, and by rotating a shaft 123 on the base 121, each swing rod 122 is fixed on the shaft 123. The operating rod 11 is connected to one of the swing rods 122. When the operating rod 11 moves, it drives one of the swing rods 122 and the shaft 123 to rotate synchronously, and the shaft 123 drives the remaining swing rods 122 to rotate, thereby realizing the three-phase synchronous opening and closing action, which helps to connect or disconnect the circuit at the same time, protect the voltage transformer, and avoid current misalignment or voltage imbalance.

[0049] In this embodiment, both the swing rod 122 and the rotating shaft 123 are made of insulating material; two or three conductive rods 13 are arranged side by side at intervals, and three swing rods 122 are arranged side by side at intervals and fixed to the rotating shaft 123.

[0050] The following is a detailed description of the operation of the disconnect switch (taking the horizontal push-pull operation lever 11 as an example):

[0051] See Figure 2 and Figure 5 When the circuit breaker is tripped, the operating handle 17 is rotated to drive the actuating rod 16 to rotate. The rotation of the actuating rod 16 drives the operating rod 11 to move from left to right, which drives the swing rod 122 to rotate counterclockwise by a certain angle. The swing rod 122 pulls the conductive rod 13 to move to the left. The first end of the conductive rod 13 gradually moves away from the busbar 21 until the second end of the conductive rod 13 contacts and connects with the grounding busbar 22 through the pin 14, thus achieving the tripping of the circuit breaker.

[0052] See Figure 4 and Figure 5When closing the circuit, rotating the operating handle 17 drives the actuating rod 16 to rotate. The rotation of the actuating rod 16 drives the operating rod 11 to move from right to left, causing the swing rod 122 to rotate clockwise by a certain angle. The swing rod 122 pushes the conductive rod 13 to move to the right. The second end of the conductive rod 13 gradually moves away from the grounding bar 22 until the first end of the conductive rod 13 contacts and connects with the bus bar 21 through the pin 14, thus realizing the closing of the circuit.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A disconnecting switch, characterized in that, For installation on the cabinet (20) of a switchgear, the cabinet (20) is provided with a busbar (21) and a grounding busbar (22), the disconnecting switch includes: An operating rod (11) is slidably mounted on the cabinet (20); The conductive rod (13) is slidably disposed in the inner cone (23) of the voltage transformer located in the cabinet (20). Both ends of the conductive rod (13) are provided with pins (14), and an elastic element is provided between the pins (14) and the conductive rod (13). The transmission assembly (12) is located inside the cabinet (20). The transmission assembly (12) connects the operating rod (11) and the conductive rod (13). The operation rod (11) moves through the transmission assembly (12) to drive the conductive rod (13) to move, so that the first end of the conductive rod (13) is connected to the busbar (21) through the pin (14) to close the circuit, or the second end of the conductive rod (13) is connected to the grounding busbar (22) through the pin (14) to open the circuit.

2. The disconnecting switch according to claim 1, characterized in that, The conductive rod (13) includes a main rod (131) and two sheaths (132). The main rod (131) is slidably disposed in the inner cone (23) of the voltage transformer. The two ends of the main rod (131) are respectively connected to one of the sheaths (132). The elastic element is located inside the sheath (132) and disposed between the main rod (131) and the ejector pin (14). The sheath (132) has an opening, and the ejector pin (14) partially passes through the opening and is placed outside the sheath (132).

3. The disconnecting switch according to claim 2, characterized in that, The main rod (131) has guide cylinders (1311) at both ends. The guide cylinders (1311) are inserted into the sheath (132) and fixedly connected to the sheath (132). The elastic element is sleeved on the ejector pin (14) and is located between the ejector pin (14) and the guide cylinder (1311). The ejector pin (14) partially slides through the guide cylinder (1311).

4. The disconnecting switch according to claim 2, characterized in that, The sheath (132) has an inner top wall with the opening. The ejector pin (14) has a radially protruding stop ring (141). One side of the stop ring (141) cooperates with the inner top wall to restrict the ejector pin (14) from detaching from the sheath (132). The elastic element is located on the other side of the stop ring (141).

5. The disconnecting switch according to claim 2, characterized in that, The end of the ejector pin (14) located outside the sheath (132) has a hemispherical surface, and the ejector pin (14) is connected to the busbar (21) or the grounding busbar (22) through the hemispherical surface.

6. The disconnecting switch according to claim 1, characterized in that, The disconnect switch also includes an actuating rod (16), an operating handle (17), and a housing (18). The housing (18) is fixed to the cabinet (20). The actuating rod (16) is rotatably mounted on the housing (18). One end of the actuating rod (16) is threadedly connected to the operating rod (11), and the other end of the actuating rod (16) is drivenly connected to the operating handle (17). The rotation of the operating handle (17) drives the actuating rod (16) to rotate, and the rotation of the actuating rod (16) drives the operating rod (11) to move.

7. The disconnecting switch according to claim 6, characterized in that, The outer casing (18) is located outside the cabinet (20), and the connection between the actuating lever (16) and the operating lever (11) is located inside the outer casing (18).

8. The disconnecting switch according to claim 7, characterized in that, The disconnect switch also includes a fixed bracket (19), which is disposed inside the housing (18). The actuating rod (16) passes through the fixed bracket (19) and is rotatably connected to the fixed bracket (19).

9. The disconnecting switch according to claim 7, characterized in that, The portion of the actuating lever (16) outside the cabinet (20) is located inside the outer shell (18). The outer shell (18) is provided with a socket, and the operating handle (17) passes through the socket and is connected to the actuating lever (16).

10. A switch cabinet, characterized in that, It includes a cabinet (20), a busbar (21), a grounding busbar (22), a voltage transformer inner cone (23), and a disconnecting switch as described in any one of claims 1-9.

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