A telescopic automatic grounding isolation switch for high-power capacitor switching test

Abstract

The application discloses a telescopic automatic grounding isolating switch for high-power capacitor switching test, and relates to the technical field of power equipment test, which comprises a bottom plate, an air cylinder, a fixed plate, a first stroke switch, a second stroke switch, a movable connecting plate, a movable contact assembly, a movable clamping rod, a limiting cylinder, a grounding pipe, a grounding conductive plate, a connecting head, a capacitor connecting plate, a capacitor and a static contact. The movable contact assembly comprises an outer conductive pipe, an inner conductive pipe, an insulating positioning support ring and a contact head, the inner wall of the contact head is threadedly connected with a threaded rod, the bottom end of the threaded rod is fixedly connected with the top end of the inner conductive pipe, the bottom inner wall of the contact head is fixedly connected with the outer conductive pipe, the current axial flow direction of the outer conductive pipe is consistent with that of the inner conductive pipe, the electromagnetic attraction force between the outer conductive pipe and the inner conductive pipe is directed to the static contact in the axial direction, and the electromagnetic attraction force and the repulsive force of the electric power generated at the contact spot of the contact head and the static contact are mutually offset.

Description

Technical Field

[0001] This invention relates to the field of power equipment testing technology, specifically to a telescopic automatic grounding disconnect switch for high-power capacitor switching tests. Background Technology

[0002] Before high-power capacitors are put into operation on the power grid, they usually need to undergo switching tests to verify their performance such as withstand overvoltage and switching capability. During the test, the capacitor needs to be repeatedly connected and disconnected from the test bus using a disconnecting switch. Existing disconnecting switches for capacitor switching tests mostly use manually operated knife switches or simple mechanical contact structures to achieve the connection and disconnection between the capacitor and the bus. After the test, the test personnel need to manually operate special tools to ground and discharge the capacitor shell and related circuits. The operation steps are cumbersome and inefficient. If the operator misses the grounding step, the residual charge on the capacitor will not be released in time, which can easily cause safety accidents such as electric shock. Traditional grounding disconnect switches mostly use a simple direct contact method between moving and stationary contacts to achieve conduction. However, under high power and high current conditions, the moving and stationary contacts will generate a repulsive force due to electrodynamic force at the moment of contact, causing the moving contact assembly to vibrate and bounce, which will lead to unstable contact, contact erosion, and even test safety accidents. At the same time, existing grounding disconnect switches are inconvenient in terms of adjusting the contact distance, and cannot flexibly adjust the contact distance between the moving and stationary contacts and the movement stroke of the cylinder according to different test requirements. The operation accuracy and automation level are low. In addition, the connection method between the grounding conductive structure and the capacitor of the existing device is relatively fixed, which is inconvenient for disassembly and maintenance, and cannot meet the actual needs of frequent switching and safe grounding in the test site. Therefore, we propose a telescopic automatic grounding disconnect switch for high-power capacitor switching test. Summary of the Invention

[0003] The purpose of this invention is to provide a telescopic automatic grounding disconnect switch for high-power capacitor switching tests, so as to solve the problems of bouncing caused by electrodynamic repulsion when the moving and stationary contacts are in contact, inconvenient adjustment of the contact spacing, and inconvenient disassembly and maintenance of the grounding isolation structure in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a telescopic automatic grounding disconnect switch for high-power capacitor switching test, comprising a base plate, a cylinder, a fixed plate, a first limit switch, a second limit switch, a movable connecting plate, a moving contact assembly, a conductive arm, a movable clamping rod, a limiting cylinder, a grounding pipe, a grounding conductive plate, a connector, a capacitor connecting plate, a capacitor, and a stationary contact; The cylinder is mounted on the base plate, the fixed plate is connected to the cylinder, the piston rod of the cylinder is connected to the movable connecting plate, and the movable connecting plate is provided with a moving contact assembly. The movable connecting plate is connected to the conductive arm, and a movable clamping rod is movably mounted on the conductive arm. The fixed plate is provided with a first limit switch, the movable connecting plate is provided with a structure that cooperates with the first limit switch, and the conductive arm is provided with a structure that cooperates with the second limit switch. The limiting cylinder is fixedly mounted on the base plate. The grounding pipe penetrates the inner wall of the limiting cylinder and contacts the bottom surface. A grounding conductive plate is detachably installed on the outside of the grounding pipe. A connector is connected to one side of the grounding conductive plate. The connector is connected to a capacitor connection plate. The capacitor connection plate is located at the bottom of the capacitor. The moving contact assembly is positioned opposite the stationary contact, and the moving contact assembly is driven up and down by a cylinder to achieve contact and separation with the stationary contact. The conductive base is detachably mounted on the bottom of the base plate via a nut.

[0005] As a further aspect of the present invention: the moving contact assembly includes an outer conductive tube, an inner conductive tube, an insulating positioning support ring, and a contact head; the inner wall of the contact head is provided with a threaded groove, and a threaded rod is threadedly connected to the inner wall of the threaded groove, the bottom end of the threaded rod being fixedly connected to the top end of the inner conductive tube; the bottom inner wall of the contact head is fixedly connected to the outer conductive tube.

[0006] As a further aspect of the present invention: the inner wall of the outer conductive tube is provided with a positioning support ring, and the inner wall of the positioning support ring is connected to the outer side of the inner conductive tube, so that the outer conductive tube and the inner conductive tube are coaxially arranged.

[0007] As a further aspect of the present invention: the axial flow direction of the current in the outer conductive tube and the inner conductive tube is consistent, and an electromagnetic attraction force is generated between them along the axial direction towards the stationary contact. The electromagnetic attraction force cancels out the electrodynamic repulsive force generated at the contact point and the contact spot of the stationary contact in opposite directions, so as to prevent the moving contact assembly from bouncing due to being shaken out by the repulsive force.

[0008] As a further aspect of the present invention: the cylinder drives the movable connecting plate to move the movable contact assembly and the conductive arm up and down; when the cylinder drives the movable connecting plate to move downward, the movable connecting plate contacts the first limit switch, and the first limit switch controls the cylinder to stop retracting.

[0009] As a further aspect of the present invention: when the cylinder drives the movable connecting plate to move upward, the movable connecting plate drives the conductive arm and the movable clamping rod to move upward, and the movable clamping rod contacts the second limit switch. The second limit switch controls the cylinder to unfold, so that the contact head contacts the stationary contact head.

[0010] As a further aspect of the present invention: the position of the movable clamping rod on the conductive arm is adjustable to limit the movement distance of the cylinder, thereby adjusting the distance between the stationary contact and the contact head.

[0011] As a further aspect of the present invention: a capacitor connection plate is provided at the bottom of the capacitor, a connector is connected to the side of the capacitor connection plate, and a grounding conductive plate is provided on one side of the connector.

[0012] As a further embodiment of the present invention: the side of the grounding conductive plate is detachably installed on the outside of the grounding pipe, and the outside of the grounding pipe penetrates the inner wall of the limiting cylinder and contacts the bottom surface.

[0013] As a further embodiment of the present invention: the base plate is used to support the cylinder and the limiting cylinder, the limiting cylinder is vertically arranged on the base plate, and the limiting cylinder and the fixing plate are respectively located on opposite sides of the base plate.

[0014] Compared with the prior art, the beneficial effects of the present invention by adopting the above technical solution are as follows: 1. This invention, by setting up a moving contact assembly consisting of an outer conductive tube, an inner conductive tube, and a positioning support ring, utilizes the principle that the electromagnetic attraction force generated by the same-direction current cancels out the electrodynamic repulsion force generated by the contact surface, effectively avoiding the problem of the moving contact bouncing due to the repulsion force during high-power switching tests, thus improving the stability of contact and the safety of the test. 2. This invention achieves automated extension and retraction control of the moving contact assembly through a cylinder in conjunction with a first limit switch and a second limit switch, which is simple to operate and reliable in action; 3. By setting an adjustable movable clamping rod on the conductive arm, the present invention can conveniently and flexibly adjust the movement stroke of the cylinder and the contact distance between the stationary contact and the contact head, thereby improving the adaptability of the device to different test conditions. 4. This invention achieves detachable automatic grounding isolation of capacitors through the combined structure of grounding pipe, grounding conductive plate and limiting cylinder. The structure is simple, easy to disassemble and assemble, and convenient for equipment maintenance and replacement. 5. This invention connects to the capacitor via a connector, a grounding conductive plate, and a grounding pipe, thereby facilitating the release of residual charge in the capacitor through the grounding pipe and preventing operators from overlooking the grounding step, which could lead to electric shock or other safety accidents.

[0015] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0016] Figure 1This is a first three-dimensional schematic diagram in an embodiment of the present invention; Figure 2 This is a second perspective view in an embodiment of the present invention; Figure 3 This is a schematic diagram of the grounding pipe connection relationship in an embodiment of the present invention; Figure 4 This is a schematic diagram of the connection relationship of the defined cylinders in an embodiment of the present invention; Figure 5 This is a schematic diagram of the cylinder connection relationship in an embodiment of the present invention; Figure 6 This is a schematic diagram of the contact head in an embodiment of the present invention.

[0017] In the diagram: 1. Base plate; 2. Cylinder; 3. Fixing plate; 4. First limit switch; 5. Second limit switch; 6. Movable connecting plate; 7. Moving contact assembly; 71. Contact head; 72. Outer conductive tube; 73. Positioning support ring; 74. Threaded rod; 75. Inner conductive tube; 76. Conductive arm; 8. Movable clamping rod; 9. Limiting cylinder; 10. Grounding tube; 11. Grounding conductive plate; 12. Connector; 13. Capacitor connecting plate; 14. Capacitor; 15. Stationary contact; 16. Conductive base; 17. Nut. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0019] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] Please see the appendix Figure 1 - Appendix Figure 6 The present invention discloses a telescopic automatic grounding disconnect switch for high-power capacitor switching test, comprising a base plate 1, a cylinder 2, a fixed plate 3, a first limit switch 4, a second limit switch 5, a movable connecting plate 6, a moving contact assembly 7, a conductive arm 76, a movable clamping rod 8, a limiting cylinder 9, a grounding pipe 10, a grounding conductive plate 11, a connector 12, a capacitor connecting plate 13, a capacitor 14, and a stationary contact 15.

[0021] Cylinder 2 is mounted on base plate 1. Fixed plate 3 is connected to one side of cylinder 2. The piston rod end of cylinder 2 is connected to movable connecting plate 6. Movable contact assembly 7 is mounted on movable connecting plate 6. Movable connecting plate 6 is also connected to conductive arm 76. Conductive arm 76 extends along the moving direction of cylinder 2. Movable clamping rod 8 is movably mounted on conductive arm 76. The installation position of movable clamping rod 8 can be adjusted along the length direction of conductive arm 76.

[0022] A first limit switch 4 is provided on the fixed plate 3, and the switch position of the first limit switch 4 is located at the top of the whole, thereby ensuring that the movable connecting plate 6 contacts the first limit switch 4. When the cylinder 2 drives the movable connecting plate 6 to move downward to the set position, the movable connecting plate 6 contacts the first limit switch 4, and the first limit switch 4 sends a signal to control the cylinder 2 to stop the retraction action, thereby limiting the extreme position of the downward movement of the moving contact assembly 7.

[0023] A second limit switch 5 is provided on the limiting cylinder 9, and the switch position of the second limit switch 5 is located at the bottom of the whole, so that when the movable clamping rod 8 moves upward, the movable clamping rod 8 contacts the second limit switch 5. When the cylinder 2 drives the movable connecting plate 6 to move upward, the conductive arm 76 drives the movable clamping rod 8 to move upward synchronously. When the movable clamping rod 8 moves to the position of contacting the second limit switch 5, the second limit switch 5 sends a signal to control the cylinder 2 to perform an unfolding action, so that the contact head 71 in the moving contact assembly 7 contacts the stationary contact 15, thereby ensuring that the cylinder 2 drives the moving contact assembly 7 to move a certain distance each time. By pre-adjusting the installation position of the movable clamping rod 8 on the conductive arm 76, the effective moving stroke of the cylinder 2 can be changed, thereby conveniently adjusting the contact distance between the stationary contact 15 and the contact head 71 to adapt to the contact requirements under different test conditions.

[0024] The moving contact assembly 7 includes an outer conductive tube 72, an inner conductive tube 75, an insulating positioning support ring 73, and a contact head 71. The inner wall of the contact head 71 is provided with a threaded groove, and a threaded rod 74 is threadedly connected to the inner wall of the threaded groove. The bottom end of the threaded rod 74 is fixedly connected to the top end of the inner conductive tube 75, thereby realizing a detachable connection between the contact head 71 and the inner conductive tube 75, which facilitates replacement and maintenance after the contact head 71 is worn. The bottom inner wall of the contact head 71 is fixedly connected to the outer conductive tube 72, which is sleeved on the outside of the inner conductive tube 75. After the contact head 71 contacts the stationary contact 15, the current is introduced into the outer conductive tube 72 through the contact head 71, and then the outer conductive tube 72 and the inner conductive tube 75 respectively form a current loop.

[0025] An insulating positioning support ring 73 is provided on the inner wall of the outer conductive tube 72. The inner wall of the positioning support ring 73 is connected to the outer side of the inner conductive tube 75, so that the outer conductive tube 72 and the inner conductive tube 75 are coaxially arranged, and an insulating gap is maintained between the outer conductive tube 72 and the inner conductive tube 75 to prevent short circuits and ensure that the axial flow direction of the current in both is consistent. Since the axial flow direction of the current in the outer conductive tube 72 and the inner conductive tube 75 is consistent, according to the electromagnetic principle that currents in the same direction attract each other, an electromagnetic attraction force is generated between them in the axial direction pointing towards the stationary contact 15. At the moment of contact between the contact head 71 and the stationary contact 15, an electrodynamic repulsive force opposite in direction to the electromagnetic attraction force will be generated at the contact spot due to the current contraction effect. This electrodynamic repulsive force can easily cause the moving contact assembly 7 to vibrate and bounce, resulting in unstable contact or even contact erosion. Through the above structural design, the present invention makes the electromagnetic attraction force generated inside the moving contact assembly 7 opposite in direction and cancel each other out in magnitude with the electrodynamic repulsive force at the contact spot, thereby effectively avoiding the bouncing of the moving contact assembly 7 due to the repulsive force, and improving the stability and reliability of contact in high-power capacitor switching tests.

[0026] A capacitor connection plate 13 is provided at the bottom of the capacitor 14. A connector 12 is connected to the side of the capacitor connection plate 13. A grounding conductive plate 11 is connected to one side of the connector 12. The side of the grounding conductive plate 11 is detachably installed on the outside of the grounding pipe 10. The grounding pipe 10 is vertically installed, and the outside of the grounding pipe 10 penetrates the inner wall of the limiting cylinder 9 and contacts the bottom surface. This allows the residual charge on the capacitor 14 to be guided into the grounding system through the capacitor connection plate 13, connector 12, grounding conductive plate 11, and grounding pipe 10, thereby achieving automatic grounding isolation of the capacitor 14 after the test and ensuring the safety of test personnel and equipment. The limiting cylinder 9 plays a limiting and supporting role for the grounding pipe 10, ensuring the stability of the installation position of the grounding pipe 10.

[0027] The capacitor 14 is connected via connector 12, grounding conductive plate 11, and grounding pipe 10, which facilitates the release of residual charge in capacitor 14 from grounding pipe 10, preventing operators from missing the grounding step and causing safety accidents such as electric shock. The conductive base 16 is detachably installed on the bottom of base plate 1 via nut 17, which also prevents residual charge on the device and facilitates the guidance of charge from conductive base 16 to the bottom surface.

[0028] The working principle of this invention is as follows: During the high-power capacitor switching test, cylinder 2 drives the movable connecting plate 6 to move upward. The movable connecting plate 6 drives the moving contact assembly 7 and the conductive arm 76 to move upward synchronously. After the movable clamping rod 8 contacts the second limit switch 5, the second limit switch 5 controls the cylinder 2 to extend to the set stroke, so that the contact head 71 of the moving contact assembly 7 contacts the stationary contact 15 to conduct electricity, realizing the energization test of capacitor 14. At this time, the electromagnetic attraction force generated inside the moving contact assembly 7 cancels out the electrodynamic repulsion force at the contact spot, ensuring stable contact without bouncing. When the capacitor 14 needs to be disconnected at the end of the test, the cylinder 2 drives the movable connecting plate 6 to move down, and the moving contact assembly 7 moves down accordingly to separate the contact head 71 from the stationary contact head 15, thereby isolating the capacitor 14 from the test power supply. When the movable connecting plate 6 moves down to contact the first limit switch 4, the first limit switch 4 controls the cylinder 2 to stop retracting. At the same time, the residual charge on the capacitor 14 is introduced into the grounding system through the capacitor connecting plate 13, the connector 12, the grounding conductive plate 11 and the grounding pipe 10, completing the automatic grounding isolation, thereby ensuring the safety, reliability and efficiency of the entire switching test process.

[0029] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on.

[0030] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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, they should not be construed as limiting the scope of protection of this invention.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0032] For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A telescopic automatic grounding disconnect switch for high-power capacitor switching tests, characterized in that: Includes a base plate (1), a cylinder (2), a fixed plate (3), a first limit switch (4), a second limit switch (5), a movable connecting plate (6), a moving contact assembly (7), a conductive arm (76), a movable clamping rod (8), a limiting cylinder (9), a grounding pipe (10), a grounding conductive plate (11), a connector (12), a capacitor connecting plate (13), a capacitor (14), a stationary contact (15), a conductive base (16), and a nut (17); The cylinder (2) is mounted on the base plate (1), the fixed plate (3) is connected to the cylinder (2), the piston rod of the cylinder (2) is connected to the movable connecting plate (6), and the movable connecting plate (6) is provided with a moving contact assembly (7). The movable connecting plate (6) is connected to the conductive arm (76), and a movable clamping rod (8) is movably provided on the conductive arm (76). The fixed plate (3) is provided with a first limit switch (4). When the movable connecting plate (6) moves downward to the set position, it contacts the first limit switch (4). When the movable clamping rod (8) moves upward to the set position, it contacts the second limit switch (5). The limiting cylinder (9) is fixedly installed on the base plate (1). The grounding pipe (10) penetrates the inner wall of the limiting cylinder (9) and contacts the bottom surface. A grounding conductive plate (11) is detachably installed on the outside of the grounding pipe (10). A connector (12) is connected to one side of the grounding conductive plate (11). The connector (12) is connected to the capacitor connecting plate (13). The capacitor connecting plate (13) is located at the bottom of the capacitor (14). The moving contact assembly (7) is arranged opposite to the stationary contact (15). The moving contact assembly (7) is driven up and down by the cylinder (2) to achieve contact and separation with the stationary contact (15). The conductive base (16) is detachably mounted on the bottom of the base plate (1) by means of a nut (17).

2. The telescopic automatic grounding disconnect switch for high-power capacitor switching tests according to claim 1, characterized in that: The moving contact assembly (7) includes an outer conductive tube (72), an inner conductive tube (75), an insulating positioning support ring (73), and a contact head (71); the inner wall of the contact head (71) is provided with a threaded groove, and a threaded rod (74) is threadedly connected to the inner wall of the threaded groove, and the bottom end of the threaded rod (74) is fixedly connected to the top end of the inner conductive tube (75); the bottom inner wall of the contact head (71) is fixedly connected to the outer conductive tube (72).

3. The telescopic automatic grounding disconnect switch for high-power capacitor switching tests according to claim 2, characterized in that: The inner wall of the outer conductive tube (72) is provided with an insulating positioning support ring (73). The inner wall of the insulating positioning support ring (73) is connected to the outer side of the inner conductive tube (75), so that the outer conductive tube (72) and the inner conductive tube (75) are coaxially arranged.

4. The telescopic automatic grounding disconnect switch for high-power capacitor switching tests according to claim 3, characterized in that: The axial flow direction of the current in the outer conductive tube (72) and the inner conductive tube (75) is consistent, and an electromagnetic attraction force is generated between them in the axial direction pointing towards the stationary contact (15). The electromagnetic attraction force cancels out the electrodynamic repulsive force generated at the contact points of the contact head (71) and the stationary contact (15) in opposite directions.

5. The telescopic automatic grounding disconnect switch for high-power capacitor switching tests according to claim 1, characterized in that: The cylinder (2) drives the movable connecting plate (6) to move the movable contact assembly (7) and the conductive arm (76) up and down; when the cylinder (2) moves the movable connecting plate (6) down, the movable connecting plate (6) contacts the first limit switch (4), and the first limit switch (4) controls the cylinder (2) to stop retracting.

6. The telescopic automatic grounding disconnect switch for high-power capacitor switching tests according to claim 5, characterized in that: When the cylinder (2) drives the movable connecting plate (6) to move upward, the movable connecting plate (6) drives the conductive arm (76) and the movable clamping rod (8) to move upward. The movable clamping rod (8) contacts the second limit switch (5), and the second limit switch (5) controls the cylinder (2) to unfold, so that the contact head (71) contacts the stationary contact head (15).

7. A telescopic automatic grounding disconnector for high-power capacitor switching tests according to claim 6, characterized in that: The movable clamping rod (8) is adjustable along the length of the conductive arm (76).

8. The telescopic automatic grounding disconnect switch for high-power capacitor switching tests according to claim 1, characterized in that: The capacitor (14) has a capacitor connection plate (13) at its bottom, and a connector (12) is connected to the side of the capacitor connection plate (13). A grounding conductive plate (11) is provided on one side of the connector (12).

9. A telescopic automatic grounding disconnect switch for high-power capacitor switching tests according to claim 8, characterized in that: The side of the grounding conductive plate (11) is detachably connected to the outside of the grounding pipe (10) by bolts. The outside of the grounding pipe (10) penetrates the inner wall of the limiting cylinder (9) and contacts the bottom surface.

10. A telescopic automatic grounding disconnect switch for high-power capacitor switching tests according to claim 1, characterized in that: The base plate (1) is used to support the cylinder (2) and the limiting cylinder (9). The limiting cylinder (9) is vertically set on the base plate (1), and the limiting cylinder (9) and the fixing plate (3) are located on opposite sides of the base plate (1).

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