Grounding switch for 17.5 kV high-voltage alternating-current metal-enclosed switchgear

Abstract

The utility model discloses a grounding switch for 17.5 kV high-voltage alternating-current metal-enclosed switchgear, which comprises a bottom frame, a plurality of sensors are mounted at the top of the bottom frame, an assembly plate is fixed on the side surface of the bottom frame, and the top of each sensor is connected with a static contact; the closing device is installed on the assembling plate and used for being in contact with or disconnected from the static contact, an axis hole is formed in the side, close to the bottom frame, of one face of the assembling plate, and an operating shaft is connected into the axis hole and used for controlling the closing device to move; the closing device is provided with an acceleration mechanism, and the acceleration mechanism is used for improving the closing speed of the closing device. The closing device comprises a grounding switch, a clamping device is installed in the grounding switch, one end of a movable shaft is directly connected with a hinge end in a hinged mode, no additional connecting structural part is needed, and direct connection of the movable shaft and a corner plate can improve force action transmission. Meanwhile, no additional connecting structural part is needed, the manufacturing cost of the product can be reduced, and the overall structure is compact.

Description

Technical Field

[0001] This utility model belongs to the field of grounding switch technology, specifically relating to a grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear. Background Technology

[0002] High-voltage AC metal-enclosed switchgear is a critical piece of equipment used in power systems, primarily for the distribution, control, and protection of electrical energy. Its key internal components include circuit breakers, disconnecting switches, and grounding switches. Grounding switches are mainly used to ensure the safety of equipment and personnel. During equipment maintenance or repair, they ground the high-voltage circuit to release residual charge and prevent electric shock accidents. In the event of a system fault, they provide rapid grounding to prevent the fault from escalating and protect the equipment and system safety.

[0003] Traditional grounding switches have several drawbacks. Firstly, in terms of operational performance, some grounding switches have slow closing speeds, failing to quickly establish a reliable grounding connection. This can compromise the safety of personnel and equipment in emergencies. Secondly, their low energy efficiency during closing requires significant operating force, increasing the workload for operators and impacting the overall lifespan of the equipment. Thirdly, regarding structural design and reliability, some grounding switches have complex connection structures, requiring multiple additional connecting components for transmission and connection between parts. This not only increases manufacturing costs but also easily leads to loosening and wear at connection points, reducing the reliability and stability of the grounding switch. Furthermore, the contact pressure between the grounding blade and the contact terminal is difficult to adjust, easily resulting in poor contact, overheating, and other issues that affect the grounding effect, potentially even causing safety accidents. Utility Model Content

[0004] The purpose of this invention is to provide a grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear, in order to solve the problems of data closing speed, complex connection structure and grounding switch contact pressure adjustment in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear includes a base frame. Several sensors are mounted on the top of the base frame, and an assembly plate is fixed to the side of the base frame. A stationary contact is connected to the top of each sensor. A closing device is mounted on the assembly plate for contacting or disconnecting from the stationary contact. A central hole is formed on one side of the assembly plate near the base frame, and an operating shaft is connected within the central hole to control the movement of the closing device. An acceleration mechanism is mounted on the closing device to increase its closing speed. The closing device includes a grounding switch, and a clamping device is installed within the grounding switch.

[0007] Preferably, a rectangular contact end is provided below the stationary contact.

[0008] Preferably, a triangular groove is provided on one side of the operating shaft; the closing device also includes a corner plate, the corner plate has an extension plate at the top, the grounding knife is symmetrically arranged on both sides of the extension plate, a mating hole is provided at the turning point of the corner plate, the mating hole has a triangular protrusion that mates with the triangular groove, and the operating shaft is inserted into the mating hole for installation.

[0009] Preferably, the grounding knife has an installation hole and a fixing hole below it, and the extension plate has a hole that is concentrically connected to the installation hole and the fixing hole. A busbar is concentrically connected to the installation hole, and grounding wires are installed at both ends of the busbar.

[0010] Preferably, a cut is provided at the center of the upper part of the grounding knife, and a positioning hole is provided on the cut.

[0011] Preferably, the clamping device includes a concentric shaft inserted into a positioning hole. Both ends of the concentric shaft are detachably connected to clamping nuts. The clamping nuts are fitted with pressure plates. Both ends of the concentric shaft are fitted with clamping springs, and the two ends of the clamping springs contact one side of the grounding knife and the pressure plate.

[0012] Preferably, the corner plate has a hinge end near the mating hole, and the acceleration mechanism is connected to the hinge end.

[0013] Preferably, the acceleration mechanism includes a sleeve and a movable shaft. One end of the sleeve is hinged to the mounting plate, and one end of the movable shaft is hinged to the hinge end. The movable shaft is slidably installed inside the sleeve, and an acceleration spring is installed on the sleeve.

[0014] The technical solution of this utility model has the following beneficial effects:

[0015] 1. The operating shaft rotates, thereby driving the acceleration mechanism (sleeve and movable shaft) and the grounding switch to move. When rotating towards the open position, the acceleration spring is compressed and accumulates energy. When moving towards the close position, once the acceleration spring passes the midpoint, it releases the energy accumulated during the opening process, pushing the grounding switch to close the circuit at an extremely fast speed. Each stationary contact is equipped with a closing device. Compared with the ordinary two-phase closing device, the three-phase structure of this invention can increase the stability of the installation and improve the closing capability.

[0016] 2. One end of the movable shaft is directly connected to the hinge end, eliminating the need for additional connecting structural components. The direct connection between the movable shaft and the corner plate improves the transmission of force. At the same time, eliminating the need for additional connecting structural components also reduces the manufacturing cost of the product, resulting in a more compact overall structure.

[0017] 3. Rotate to tighten the position of the clamping nut. The pressure plate will gradually move inward, causing the clamping spring to tighten. Under the influence of the clamping spring, the two grounding blades will clamp inward simultaneously, ensuring that the contact between the grounding blade and the contact end has a certain pressure to ensure reliable contact. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the overall closing structure of this utility model.

[0020] Figure 2 This is a partial cross-sectional view of the present invention.

[0021] Figure 3 This is a cross-sectional perspective view of the present invention.

[0022] Figure 4 This is a partially exploded view of the present invention.

[0023] Figure 5 This is a schematic diagram of the grounding switch structure of this utility model.

[0024] Figure 6 This is a cross-sectional view of the clamping device of this utility model.

[0025] Figure 7 This is a schematic diagram of the stationary contact structure of this utility model.

[0026] Figure 8 This is a schematic diagram of the overall circuit breaker structure of this utility model.

[0027] Reference numerals: 10, base frame; 11, assembly plate; 101, spindle hole; 20, sensor; 201, stationary contact; 202, contact end; 203, grounding knife; 2031, notch; 2032, positioning hole; 2033, mounting hole; 2034, fixing hole; 204, busbar; 205, grounding wire; 30, operating shaft; 301, triangular groove; 40, corner plate; 401, mating hole; 402, hinge end; 403, extension plate; 50, acceleration mechanism; 501, sleeve; 502, movable shaft; 503, acceleration spring; 60, clamping device; 601, concentric shaft; 602, compression spring; 603, compression nut; 604, pressure plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0029] Example 1:

[0030] refer to Figure 1 A grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear includes a base frame 10, several sensors 20 are mounted on the top of the base frame 10, an assembly plate 11 is fixed on the side of the base frame 10, and a stationary contact 201 is connected to the top of the sensor 20.

[0031] The stationary contact 201 is connected to the high-voltage circuit. The sensor 20 is used to adapt to the 17.5kV high-voltage specification. In this way, the sensor 20 meets the electrical requirements of the 17.5kV voltage system. The sensor 20 has a capacitive sensor that can sense the 17.5kV voltage inside. It has a terminal connected to the bottom, which can transmit the electrical signal to the display (control panel on the switch cabinet) on the high-voltage AC metal-enclosed switchgear to provide the operator with an indication of whether the line is energized.

[0032] More specifically, each pair of assembly plates 11 is grouped together, the number of sensors 20 is equal to the number of each group of assembly plates 11, the sensors 20 are distributed at equal intervals, and the closing device is set between the assembly plates 11.

[0033] Preferred reference Figures 4-7 A rectangular contact end 202 is provided below the stationary contact 201. The closing device closes the circuit with the contact end 202; the rectangular design of the contact end 202 can significantly increase the contact area and avoid problems such as broken contact or uneven force during the closing process. Here, the entire outer side of the stationary contact 201 is rounded for a smooth transition, which can improve the smoothness of the contact moment when the closing device closes the circuit and improve the smoothness of the closing process.

[0034] Figure 7 In the middle, the width A and hole spacing B of the stationary contact 201 are specially designed. Both A and B are smaller than the width of a general grounding switch, so that it can meet the electrical clearance requirements of the 17.5kV system without the need for insulation treatment, which can reduce costs and facilitate installation.

[0035] refer to Figures 1-4The closing device is mounted on the mounting plate 11 for contacting or disconnecting from the stationary contact 201. A shaft hole 101 is provided on one side of the mounting plate 11 near the base frame 10. An operating shaft 30 is connected inside the shaft hole 101 and is used to control the movement of the closing device.

[0036] A triangular groove 301 is provided on one side of the operating shaft 30;

[0037] The closing device includes a grounding knife 203 and a corner plate 40. The corner plate 40 has an extension plate 403 on its top. The grounding knife 203 is symmetrically arranged on both sides of the extension plate 403. A mating hole 401 is provided at the turning point of the corner plate 40. A triangular protrusion that mates with the triangular groove 301 is provided on the mating hole 401. The operating shaft 30 is inserted into the mating hole 401 for installation.

[0038] In the above scheme, the grounding blades 203 installed on both sides of the extension plate 403 will contact the two sides of the contact end 202 during the closing process. The triangular groove 301 and the triangular protrusion of the mating hole 401 are used for assembly, so that the installation position is unique. In this way, the rotating operating shaft 30 can synchronously drive the grounding blades 203 to rotate, that is, to close and open the circuit. (The rotation of the operating shaft 30 can be manifested as manual rotation or electric rotation, and electric rotation is specifically manifested as a mechanism or device that can drive the operating shaft 30 to rotate).

[0039] In a preferred embodiment, a mounting hole 2033 and a fixing hole 2034 are provided below the grounding knife 203. An extension plate 403 is provided with a hole that is concentrically matched with the mounting hole 2033 and the fixing hole 2034. A busbar 204 is concentrically connected to the mounting hole 2033, and grounding wires 205 are installed at both ends of the busbar 204.

[0040] In this preferred embodiment, a busbar 204 is connected to the mounting hole 2033, and a pin or bolt is connected to the fixing hole 2034 to fix the two grounding blades 203 on the extension plate 403. The mounting hole 2033 and the fixing hole 2034 are set to facilitate the installation of the busbar 204 and to fix the connection of the grounding blades 203.

[0041] Specific current diversion process: The busbar 204 is connected to multiple combination switching devices at the same time. During the closing process, current will be generated. The current in the circuit will immediately flow to the ground along the busbar 204 and the grounding wire 205, thereby protecting electrical equipment and personnel and improving the safety performance of the device.

[0042] Example 2:

[0043] refer to Figures 4-6 A notch 2031 is provided at the center of the top of the grounding knife 203, and a positioning hole 2032 is provided on the notch 2031. A clamping device 60 is installed inside the grounding knife 203.

[0044] The clamping device 60 includes a concentric shaft 601, which is inserted into the positioning hole 2032. Both ends of the concentric shaft 601 are detachably connected to a clamping nut 603. The clamping nut 603 is fitted with a pressure plate 604. Both ends of the concentric shaft 601 are fitted with a clamping spring 602. Both ends of the clamping spring 602 contact one side of the grounding knife 203 and the pressure plate 604.

[0045] In the above scheme, by rotating and tightening the position of the clamping nut 603, the pressure plate 604 will gradually move inward, causing the clamping spring 602 to be pressed. Under the influence of the clamping spring 602, the two grounding blades 203 will clamp inward at the same time, ensuring that the contact between the grounding blade 203 and the contact end 202 has a certain pressure, so as to ensure reliable contact.

[0046] More specifically, the contact pressure of the grounding knife 203 is adjusted by rotating and adjusting the tightness of the clamping nut 603.

[0047] Example 3:

[0048] refer to Figures 1-3 The closing device is equipped with an acceleration mechanism 50;

[0049] The corner plate 40 is provided with a hinge end 402 on the side near the mating hole 401. The acceleration mechanism 50 is connected to the hinge end 402. The acceleration mechanism 50 is used to improve the closing speed of the closing device.

[0050] The acceleration mechanism 50 includes a sleeve 501 and a movable shaft 502. One end of the sleeve 501 is hinged to the mounting plate 11, and one end of the movable shaft 502 is hinged to the hinge end 402. The movable shaft 502 is slidably installed inside the sleeve 501, and an acceleration spring 503 is installed on the sleeve 501.

[0051] In the above scheme, the operating shaft 30 is rotated, which in turn drives the acceleration mechanism 50 (sleeve 501 and movable shaft 502) and the grounding switch 203 to move. When rotating towards the open position, the acceleration spring 503 is compressed and stores energy. When moving towards the close position, once the acceleration spring 503 has rotated past the midpoint, it releases the energy stored during the opening process, pushing the grounding switch 203 to close the circuit at an extremely fast speed. Combined with the use of the busbar 204, even if the circuit is energized, it can reliably close the circuit without damage, allowing the current in the circuit to immediately flow to the ground along the busbar 204 and the grounding wire 205, thereby protecting electrical equipment and personnel.

[0052] Sleeve 501 is directly hinged to assembly plate 11, and one end of movable shaft 502 is directly hinged to hinge end 402. No additional connecting structural parts are required. The direct connection between movable shaft 502 and corner plate 40 can improve the transmission of force. At the same time, the absence of additional connecting structural parts can reduce the manufacturing cost of the product and make the overall structure compact.

[0053] It should be noted that the sleeve 501 and the movable shaft 502 here do not function as hydraulic devices; they directly accelerate by increasing kinetic energy through the acceleration spring 503.

[0054] Finally, a closing device is provided below each stationary contact 201, and the figure shows a three-phase state (i.e., three closing devices). Compared with the ordinary closing device with only two phases, the three-phase structure of the present invention can increase the stability of the installation and improve the closing capability.

[0055] The specific implementation process of this utility model is as follows:

[0056] The operating shaft 30 rotates, which in turn drives the acceleration mechanism 50 (sleeve 501 and movable shaft 502) and the grounding switch 203 to move. When rotating towards the open position, the acceleration spring 503 is compressed and stores energy. When moving towards the close position, once the acceleration spring 503 has rotated past the midpoint, it releases the energy stored during the opening process, pushing the grounding switch 203 to close the circuit at an extremely fast speed. Combined with the use of the busbar 204, even if the circuit is energized, it can reliably close the circuit without damage, allowing the current in the circuit to immediately flow to the ground along the busbar 204 and the grounding wire 205, thereby protecting electrical equipment and personnel.

[0057] The above embodiments are merely exemplary models of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Various modifications or equivalent substitutions can be made to this utility model within its substance and scope of protection. Such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this utility model.

[0058] In the description of this utility model, it should be noted that the terms "inner," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached circle, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model and simplifying the description, 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, these terms indicating orientation or positional relationship should not be construed as limitations on this utility model.

[0059] In the description of this utility model, it should be further noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, these terms can refer to a fixed connection, a detachable connection, or an integral connection between components; they can also refer to a mechanical connection or an electrical connection; or they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

Claims

1. A grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear, comprising a base frame (10), wherein a plurality of sensors (20) are mounted on the top of the base frame (10), characterized in that: The mounting plate (11) is fixed to the side of the base frame (10), and the top of the sensor (20) is connected to a stationary contact (201); The closing device is mounted on the mounting plate (11) for contacting or disconnecting from the stationary contact (201). The mounting plate (11) has a shaft hole (101) on one side near the base frame (10). An operating shaft (30) is connected inside the shaft hole (101) and the operating shaft (30) is used to control the movement of the closing device. An acceleration mechanism (50) is installed on the closing device, which is used to increase the closing speed of the closing device; The closing device includes a grounding switch (203), and a clamping device (60) is installed inside the grounding switch (203).

2. The grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear according to claim 1, characterized in that: A rectangular contact end (202) is provided below the stationary contact (201).

3. The grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear according to claim 2, characterized in that: A triangular groove (301) is provided on one side of the operating shaft (30); The closing device also includes a corner plate (40), the corner plate (40) has an extension plate (403) on top, the grounding knife (203) is symmetrically arranged on both sides of the extension plate (403), the corner plate (40) has a mating hole (401) at the turning point, the mating hole (401) has a triangular protrusion that mates with the triangular groove (301), and the operating shaft (30) is inserted into the mating hole (401) for installation.

4. A grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear according to claim 3, characterized in that: The grounding knife (203) has an installation hole (2033) and a fixing hole (2034) below it. The extension plate (403) has a hole that is concentrically matched with the installation hole (2033) and the fixing hole (2034). A busbar (204) is concentrically connected to the installation hole (2033). Grounding wires (205) are installed at both ends of the busbar (204).

5. A grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear according to claim 4, characterized in that: The grounding knife (203) has a cut (2031) at the center of its upper part, and a positioning hole (2032) is provided on the cut (2031).

6. A grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear according to claim 5, characterized in that: The clamping device (60) includes a concentric shaft (601) inserted into a positioning hole (2032). Both ends of the concentric shaft (601) are detachably connected to a clamping nut (603). The clamping nut (603) is fitted with a pressure plate (604). Both ends of the concentric shaft (601) are fitted with a clamping spring (602). Both ends of the clamping spring (602) contact one side of the grounding knife (203) and the pressure plate (604).

7. A grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear according to claim 3, characterized in that: The corner plate (40) has a hinge end (402) on the side near the mating hole (401), and the acceleration mechanism (50) is connected to the hinge end (402).

8. A grounding switch for a 17.5kV high-voltage AC metal-enclosed switchgear according to claim 6, characterized in that: The acceleration mechanism (50) includes a sleeve (501) and a movable shaft (502). One end of the sleeve (501) is hinged to the mounting plate (11), and one end of the movable shaft (502) is hinged to the hinge end (402). The movable shaft (502) is slidably installed inside the sleeve (501), and an acceleration spring (503) is installed on the sleeve (501).

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