Mechanical interlock for controlling circuit breakers and disconnectors and method

Abstract

The application discloses a mechanical interlocking device and method for controlling circuit breakers and disconnectors, which can be adapted to the mechanical interlocking of old equipment of different sizes and ensures the reliability of the action of the interlocking mechanism; the device comprises a main shaft crank arm, one end of the main shaft crank arm is fixedly installed on a main shaft of a circuit breaker, the other end of the main shaft crank arm is hingedly connected with one end of a rocker, the other end of the rocker is hingedly connected with one end of a rocker arm, the middle part of the rocker arm is hingedly connected with a support shaft, the support shaft is fixedly arranged on a housing of the circuit breaker, and a rectangular hole is arranged on a plug-in plate at the other end of the rocker arm; the lock plate comprises a lock plate body, a plug-in rod and a lock plate hinged part, the plug-in rod and the lock plate hinged part are vertically arranged on the two sides of the lock plate body respectively, and the plug-in rod is plugged into the rectangular hole; a yoke and a yoke shaft are arranged on an L-shaped plate, the L-shaped plate is arranged at one end of a transmission shaft, the transmission shaft and the yoke shaft are eccentric shafts, one end of the transmission shaft is hingedly connected with the lock plate hinged part, and the other end of the transmission shaft is provided with a gear shifting handle.

Description

Technical Field

[0001] This invention belongs to the field of power equipment switching technology, specifically relating to a mechanical interlocking device and method for controlling circuit breakers and disconnectors. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, to meet the ever-increasing electricity demand, the overall renovation of aging substations and transmission lines is underway, updating transformers, high-voltage switches, and other equipment that have been in operation for a long time and no longer meet operational requirements, thereby improving the safety of the power grid. Appropriately advanced construction of the distribution network is also being implemented to enhance its carrying capacity. For aging equipment, there are significant safety risks. Scrapping and replacing it with new equipment involves both infrastructure development and the manufacturing of new equipment, resulting in a long cycle and high costs. Compared to the cost and time involved in scrapping and replacing old equipment, partially upgrading existing equipment can quickly resolve safety hazards.

[0004] For the renovation of XGN switchgear, the main focus is on maintaining the original cabinet structure or making no major alterations to facilitate on-site construction. Only the internal circuit breakers and other components are replaced, and the busbar system is rebuilt. To prevent misoperation, a mechanical anti-misoperation interlocking function is essential. Therefore, a mechanical interlocking device is urgently needed to connect the operating procedures between the replaced circuit breaker and the retained disconnector, thus fulfilling the anti-misoperation function. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a mechanical interlocking device and method for controlling circuit breakers and disconnectors. This device is adaptable to the mechanical interlocking of older equipment of different sizes and ensures that the disconnector can only be opened or closed when the circuit breaker is in the open state. This meets the safety and reliability requirements for preventing misoperation and guarantees the reliability of the interlocking mechanism.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, the present invention provides a mechanical interlocking device for controlling circuit breakers and disconnectors, comprising: a main shaft crank arm, a rocker arm, a support shaft, a rocker arm, a locking plate, a shift fork, a shift shaft, and a shift handle;

[0008] One end of the main shaft crank arm is fixedly mounted on the main shaft of the circuit breaker. The other end of the main shaft crank arm is hinged to one end of the rocker arm. The other end of the rocker arm is hinged to one end of the rocker arm. The middle part of the rocker arm is hinged to the support shaft. The support shaft is fixedly mounted on the housing of the circuit breaker. The main shaft of the circuit breaker and the axis of the support shaft are parallel. The other end of the rocker arm is provided with a plug plate, and the plug plate is provided with a rectangular hole.

[0009] The locking plate includes a locking plate body, a connecting rod, and a locking plate hinge. The connecting rod and the locking plate hinge are respectively vertically arranged on both sides of the locking plate body. The connecting rod is inserted into the rectangular hole. The shift shaft and the transmission shaft form an eccentric shaft with parallel axes. The shift shaft is arranged on one end of the transmission shaft and is hinged to the locking plate hinge. The other end of the transmission shaft is provided with a shift handle.

[0010] The drive shaft is rotatably mounted on the housing of the disconnect switch.

[0011] Furthermore, one end of the rocker arm connected to the spindle crank arm is provided with a plurality of first hinge holes along the width direction, and the other end of the rocker arm is provided with a plurality of second hinge holes along the length direction.

[0012] Furthermore, the rocker arm has an acute-angled triangle structure, and the rocker arm has an obtuse-angled triangle structure.

[0013] Furthermore, the rocker arm is divided into an input arm section and an output arm section. The input arm section is from the support shaft to the hinge position between the rocker arm and the rocker stick, and the output arm section is from the support shaft to the position of the rectangular hole on the rocker arm.

[0014] Furthermore, the rocker arm is provided with a plurality of third hinge holes in the middle, the third hinge holes being used for hinge connection with the support shaft.

[0015] Furthermore, the end of the rocker arm that is hinged to the rocker stick is provided with a plurality of fourth hinge holes for hinged with the second hinge holes provided along the length direction of the rocker stick.

[0016] Furthermore, the plug plate is disposed on the side of the rocker arm away from the main shaft of the circuit breaker, and the length direction of the rectangular hole on the plug plate is parallel to the normal direction of the rocker arm, and the lock plate body can slide up and down in the rectangular hole.

[0017] Furthermore, the fork is connected to the disconnecting switch for opening and closing operations of the disconnecting switch.

[0018] Furthermore, the drive shaft and the shift shaft are connected as a single unit by an L-shaped plate. The axis of the drive shaft is located at the corner of the L-shaped plate, the shift fork is located in the vertical position of the L-shaped plate, and the shift shaft is located in the horizontal position of the L-shaped plate.

[0019] Secondly, the present invention also provides a method for operating a mechanical interlocking device for controlling circuit breakers and disconnectors, comprising: when the circuit breaker is in the closed state, the main shaft crank arm rotates counterclockwise to a predetermined position, driving the rocker arm to move, the rocker arm driving the rocker arm to swing counterclockwise around the support shaft as the center position, the plug plate on the rocker arm is raised to the predetermined position, at this time the lower end face of the locking plate body contacts the upper surface of the rocker arm, so the downward movement of the locking plate is prevented, the shift handle cannot rotate counterclockwise, the shift fork cannot move laterally to the left, it is in the locked state, and the disconnector cannot be closed;

[0020] When the circuit breaker is in the open state, the main shaft crank arm rotates clockwise to a predetermined position, driving the rocker arm to move. The rocker arm drives the rocker arm to rotate clockwise around the support shaft, causing the right end plug plate of the rocker arm to fall to a predetermined position. At this time, the upper surface of the plug plate is not in contact with the lower end face of the locking plate body and there is a certain distance between them. The downward movement function of the locking plate is unlocked. After the downward movement of the locking plate is unlocked, the shift handle can rotate counterclockwise, and the shift fork can move laterally to the left, which is the unlocked state. The disconnect switch can be closed.

[0021] Compared with the prior art, the advantages and positive effects of this invention are:

[0022] This invention, through the orderly connection and reasonable hinge of the main shaft crank arm, rocker arm, and rocker arm, can conveniently transmit the motion state of the circuit breaker's main shaft to the shift fork, thereby realizing the mechanical programmed operation of the disconnecting switch's opening and closing. It solves the related mechanical structure coordination and transmission problems of the procedural linkage between the circuit breaker and the disconnecting switch, achieving stable and effective force transmission and mutual operational procedures, effectively preventing procedural misoperation of the opening and closing of the circuit breaker and the disconnecting switch. The interlocking device is an assembled structure, compact, simple, and efficient. All interlocking components are hinged, eliminating jamming factors, simplifying maintenance, and ensuring the reliability of the interlocking mechanism's operation. It achieves a reasonable procedural interlocking function between the circuit breaker and the disconnecting switch: when the circuit breaker is in the closed state, the disconnecting switch is locked for opening and closing operations; when the circuit breaker is in the open state, the disconnecting switch is unlocked for opening and closing operations, ensuring that the equipment operation meets the national standards for safety and reliability in preventing misoperation.

[0023] This invention also provides multiple sets of hinge holes, such as multiple first hinge holes on the rocker arm, a specific arrangement of second hinge holes on the spindle crank arm, and multiple third and fourth hinge holes on the rocker arm. These allow for various combinations during the installation and commissioning of the mechanical interlocking components, enabling the mechanical interlocking device to reach its optimal working state and meet the safety and reliability requirements for preventing misoperation. Furthermore, in cases where the rocker arm length may not meet the actual mechanical interlocking requirements, different combinations of hinge holes allow the rocker arm length to be flexibly adjusted to meet corresponding positional needs, enhancing the adaptability of the entire mechanical interlocking device in different application environments. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 This is a structural diagram of the mechanical interlocking device installed in the equipment according to the present invention;

[0026] Figure 2 This is a structural diagram of the mechanical interlocking device for the closed state of the circuit breaker according to the present invention;

[0027] Figure 3 This is a structural diagram of the mechanical interlocking device for the circuit breaker in the open state according to the present invention;

[0028] Figure 4 This is a diagram of the rocker arm structure of the present invention;

[0029] Figure 5 This is a structural diagram of the rocker arm of the present invention;

[0030] Figure 6 This is a structural diagram showing the relative positions of the shift lever, drive shaft, L-shaped plate, shift shaft, and shift fork of the present invention. 。

[0031] In the diagram: 1. Circuit breaker; 2. Main spindle crank arm; 3. Rocker arm; 4. Support shaft; 5. Main spindle; 6. Rocker arm; 7. Locking plate; 8. Drive shaft; 9. Shift fork; 10. Shift lever; 11. Locking plate body; 12. Connecting rod; 13. Locking plate hinge; 14. Second hinge hole; 15. First hinge hole; 16. Fourth hinge hole; 17. Third hinge hole; 18. Connecting plate; 19. Shift shaft; 20. L-shaped plate. Detailed Implementation

[0032] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Example 1

[0035] This embodiment discloses a mechanical interlocking device for controlling circuit breakers and disconnectors, such as... Figures 1-6 As shown, the circuit breaker includes a main shaft crank arm 2, a rocker arm 3, a support shaft 4, a rocker arm 6, a locking plate 7, a shift shaft 19, and a shift handle 10. One end of the main shaft crank arm 2 is fixedly mounted on the main shaft 5 of the circuit breaker. The other end of the main shaft crank arm 2 is hinged to one end of the rocker arm 3. The other end of the rocker arm 3 is hinged to one end of the rocker arm 6. The middle part of the rocker arm 6 is hinged to the support shaft 4. The support shaft 4 is fixedly mounted on the housing of the circuit breaker 1. The main shaft 5 of the circuit breaker is connected to the main shaft 5 of the circuit breaker 1. The axis of the support shaft 4 is parallel, and the other end of the rocker arm 6 is provided with a plug plate 18, which has a rectangular hole; the locking plate 7 has a Z-shaped plate structure, including a locking plate body 11, a plug rod 12, and a locking plate hinge part 13. The plug rod 12 and the locking plate hinge part 13 are respectively vertically arranged on both sides of the locking plate body 11. The normal direction of the locking plate 7 is perpendicular to the normal direction of the rocker arm 6, and the plug rod 12 is plugged into the rectangular hole; the pivot shaft 19 The eccentric shaft formed parallel to the axis of the drive shaft 8, the dial shaft 19 The shift shaft 19 is hinged to the locking plate hinge part 13 at one end of the drive shaft 8, and a shift handle 10 is provided at the other end of the drive shaft 8. The drive shaft 8 is rotatably mounted on the housing of the disconnecting switch operating mechanism. The normal direction of the housing of the circuit breaker 1 where the support shaft 4 is located is perpendicular to the normal direction of the housing of the disconnecting switch operating mechanism where the drive shaft 8 is located.

[0036] The main shaft crank arm 2 can swing clockwise or counterclockwise with the main shaft 5 of the circuit breaker. The main shaft crank arm 2 drives the rocker arm 3 to move, and the rocker arm 3 drives the rocker arm 6 to swing around the support shaft 4. The plug rod 12 can slide vertically up and down through the rectangular hole on the plug plate 18. The shift handle 10 can swing clockwise or counterclockwise, driving the L-shaped plate 20 to swing clockwise or counterclockwise, which in turn drives the shift fork 9 to swing horizontally left and right, and the shift shaft 19 to swing vertically up and down. Through the orderly connection and reasonable hinge of the main shaft crank arm 2, rocker arm 3, rocker arm 6, locking plate 7, and shift shaft 19, the movement of the main shaft 5 of the circuit breaker can be transmitted to the shift fork 9 in a relatively convenient manner, thereby realizing the operation of opening and closing the disconnecting switch and improving the overall ease of operation. The relevant mechanical structure coordination and transmission problems of the operation linkage between the circuit breaker 1 and the disconnecting switch are solved, realizing stable and effective force transmission to complete the opening and closing operation of the disconnecting switch.

[0037] The rocker arm 3 has multiple first hinge holes 15 along its width direction at one end connected to the spindle crank arm 2. The first hinge holes are arranged in groups of three. The other end of the rocker arm 3 has multiple second hinge holes 14 along its length direction. The second hinge holes 14 are arranged in groups of five. The first hinge holes 15 and the second hinge holes 14 can be combined in different ways to achieve a wide range of adjustments, meeting the positional requirements of the mechanical interlocking components and enabling them to reach their optimal working state. When the rocker arm 6 is hinged to the first hinge hole 15 at the end of the spindle crank arm 2, it can be hinged to any one of the second hinge holes 14 to obtain different lengths of the rocker arm 3, so that the rocker arm 6 obtains the required initial swing angle. If the initial swing angle of the rocker arm 6 is a small positive deviation that does not meet the requirements, and adjusting to the adjacent second hinge hole produces a small negative deviation, the remaining holes in the first hinge hole 15 where the spindle crank arm 2 is hinged can be finely adjusted to meet the positional requirements of the mechanical interlocking components.

[0038] Both the rocker arm 6 and the rocker rod 3 are made of 2mm steel plate. The rocker rod 3 has an acute-angled triangle structure, and the rocker arm 6 has an obtuse-angled triangle structure. The rocker arm 6 is divided into an input arm section and an output arm section. The length of the input arm section is the distance from the support shaft 4 to the hinge position of the rocker arm 6 and the rocker rod 3. The length of the output arm section is the distance from the support shaft 4 to the rectangular hole on the rocker arm 6.

[0039] The rocker arm 6 is provided with multiple third hinge holes 17 in the middle, which are used to hinge with the support shaft 4. By the distance difference between the multiple third hinge holes 17, different output arm lengths can be obtained to meet the requirements of different models of vacuum circuit breakers 1. The end of the rocker arm 6 that is hinged to the rocker arm 3 is provided with multiple fourth hinge holes 16, which are used to hinge with the second hinge holes of the rocker arm 3 along the length direction. Different output rotation angles can be obtained by different input arm lengths so that the left end of the rocker arm 6 meets the predetermined position requirements, thereby meeting the position requirements of the interlocking components and enabling them to reach the optimal working state. The arrangement of multiple first hinge holes 15 and second hinge holes 14 in a specific pattern allows operators to choose from various combinations when debugging mechanical interlocking components. This addresses the challenge of adapting existing structural connection methods to diverse positional requirements across different application scenarios and equipment installation needs. Furthermore, the use of multiple sets of hinge holes provides a flexible adjustment method for situations where the length of the rocker arm 6 may not meet the actual mechanical interlocking requirements. The combination of different hinge holes allows the length of the rocker arm 6 to be flexibly adjusted to meet corresponding positional needs, thus enhancing the adaptability of the entire mechanical interlocking structure in different application environments.

[0040] The plug plate 18 is located on the side of the rocker arm 6 away from the main shaft 5 of the circuit breaker. The length direction of the rectangular hole on the plug plate 18 is parallel to the normal direction of the rocker arm 6. The plug rod 12 on the locking plate body 11 can slide up and down in the rectangular hole. The shift fork 9 is engaged with the disconnecting switch operating mechanism to control the opening and closing operation of the disconnecting switch. The transmission shaft 8 and the shift shaft 19 are connected as a whole by an L-shaped plate. The shift fork 9 and the shift shaft 19 are on the L-shaped plate 20. The shift fork 9 is in the vertical position of the L-shaped plate, and the shift shaft 19 is in the horizontal position of the L-shaped plate 20. The axis of the transmission shaft 8 is at the corner of the L-shaped plate. The shift shaft 19 is hinged to the hinge part 13 of the locking plate 7. When the shift handle 10 is rotated, the shift fork 9 swings horizontally, the shift shaft 19 swings vertically, and the locking plate 7 moves vertically up and down under the drive of the shift shaft 19.

[0041] Example 2

[0042] This embodiment discloses a working method for a mechanical interlocking device used to control circuit breakers and disconnectors, as follows:

[0043] When circuit breaker 1 is in the closed state, the main shaft crank arm 2 rotates counterclockwise to a predetermined position, driving the rocker arm 3 to move. The rocker arm 3 drives the rocker arm 6 to rotate counterclockwise around the support shaft 4 as the center position. The plug plate 18 on the rocker arm 6 is raised to the predetermined position. At this time, the lower end face of the locking plate body 11 contacts the upper surface of the rocker arm 6. Therefore, the vertical downward movement of the locking plate 7 is prevented, the shift handle 10 cannot rotate counterclockwise, the shift fork 9 cannot move laterally to the left, the disconnecting switch operating mechanism is locked, and the disconnecting switch cannot be closed. This means that when circuit breaker 1 is in the closed state, the disconnecting switch cannot be opened or closed.

[0044] When the circuit breaker 1 is in the open state, the main shaft crank arm 2 rotates clockwise to a predetermined position, driving the rocker arm 3 to move. The rocker arm 3 drives the rocker arm 6 to rotate clockwise around the support shaft 4, causing the right end plug plate 18 of the rocker arm 6 to fall to a predetermined position. At this time, the upper surface of the plug plate 18 is not in contact with the lower end face of the locking plate body 11 and there is a certain distance between them. The downward vertical movement of the locking plate 7 is not prevented. The shift handle 10 can rotate counterclockwise, and the shift fork 9 can move laterally to the left. The disconnecting switch operating mechanism is unlocked, and the disconnecting switch can be closed. This allows the disconnecting switch to be opened and closed when the circuit breaker 1 is in the open state.

[0045] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A mechanical interlocking device for controlling circuit breakers and disconnectors, characterized in that, include: Main spindle crank arm, rocker arm, support shaft, rocker arm, lock plate, shift fork, shift shaft, drive shaft and shift lever; One end of the main shaft crank arm is fixedly mounted on the main shaft of the circuit breaker. The other end of the main shaft crank arm is hinged to one end of the rocker arm. The other end of the rocker arm is hinged to one end of the rocker arm. The middle part of the rocker arm is hinged to the support shaft. The support shaft is fixedly mounted on the housing of the circuit breaker. The main shaft of the circuit breaker and the axis of the support shaft are parallel. The other end of the rocker arm is provided with a plug plate. The plug plate is provided with a rectangular hole. The plug plate is located on the side of the rocker arm away from the main shaft of the circuit breaker. The length direction of the rectangular hole on the plug plate is parallel to the normal direction of the rocker arm. The plug rod on the locking plate body can slide up and down in the rectangular hole. The locking plate includes a locking plate body, a connecting rod, and a locking plate hinge. The connecting rod and the locking plate hinge are respectively vertically arranged on both sides of the locking plate body. The connecting rod is inserted into the rectangular hole. The shift shaft and the transmission shaft form an eccentric shaft with parallel axes. The shift shaft is arranged on one end of the transmission shaft and is hinged to the locking plate hinge. The other end of the transmission shaft is provided with a shift handle. The drive shaft and the shift shaft are connected as a single unit by an L-shaped plate. The axis of the drive shaft is located at the corner of the L-shaped plate, the shift fork is located in the vertical position of the L-shaped plate, and the shift shaft is located in the horizontal position of the L-shaped plate. The drive shaft is rotatably mounted on the housing of the disconnect switch; When the circuit breaker is in the closed state, the lower end face of the locking plate body contacts the upper surface of the rocker arm, and the downward vertical movement of the locking plate is prevented. When the circuit breaker is in the open state, the upper surface of the plug plate is not in contact with the lower end face of the locking plate body and there is a certain distance between them, and the downward vertical movement of the locking plate is not prevented.

2. The mechanical interlocking device for controlling circuit breakers and disconnectors as described in claim 1, characterized in that, The rocker arm has multiple first hinge holes along its width at one end connected to the spindle crank arm, and multiple second hinge holes along its length at the other end.

3. A mechanical interlocking device for controlling circuit breakers and disconnectors as described in claim 1, characterized in that, The rocker arm has an acute-angled triangle-like structure, and the rocker arm has an obtuse-angled triangle-like structure.

4. A mechanical interlocking device for controlling circuit breakers and disconnectors as described in claim 1, characterized in that, The rocker arm is divided into an input arm section and an output arm section. The input arm section extends from the support shaft to the hinge position between the rocker arm and the rocker stick, and the output arm section extends from the support shaft to the rectangular hole on the rocker arm.

5. A mechanical interlocking device for controlling circuit breakers and disconnectors as described in claim 1, characterized in that, The rocker arm is provided with a plurality of third hinge holes in the middle, which are used to hinge with the support shaft.

6. A mechanical interlocking device for controlling circuit breakers and disconnectors as described in claim 1, characterized in that, The rocker arm is provided with a plurality of fourth hinge holes at one end where it is hinged to the rocker arm, for hinged with the second hinge holes provided along the length direction of the rocker arm.

7. A mechanical interlocking device for controlling circuit breakers and disconnectors as described in claim 1, characterized in that, The fork is connected to the disconnecting switch for opening and closing operations of the disconnecting switch.

8. A method for operating a mechanical interlocking device for controlling circuit breakers and disconnectors as described in any one of claims 2-7, characterized in that, Includes: When the circuit breaker is in the closed state, the main shaft crank arm rotates counterclockwise to a predetermined position, driving the rocker arm to move. The rocker arm drives the rocker arm to swing counterclockwise around the support shaft as the center position. The plug plate on the rocker arm is raised to the predetermined position. At this time, the lower end face of the locking plate body contacts the upper surface of the rocker arm. Therefore, the downward movement of the locking plate is prevented, the shift handle cannot rotate counterclockwise, the shift fork cannot move laterally to the left, the disconnecting switch operating mechanism is locked, and the disconnecting switch cannot be closed. When the circuit breaker is in the open state, the main shaft crank arm rotates clockwise to a predetermined position, driving the rocker arm to move. The rocker arm drives the rocker arm to rotate clockwise around the support shaft. The right end plug plate of the rocker arm falls to a predetermined position. At this time, the upper surface of the plug plate is not in contact with the lower end face of the locking plate body and there is a certain distance. The downward vertical movement of the locking plate is not prevented. The shift handle can rotate counterclockwise, the shift fork can move laterally to the left, the disconnect switch operating mechanism is unlocked, and the disconnect switch can be closed.

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