A high voltage switchgear

Abstract

The present invention relates to a high-voltage switchgear, a fracture structure, an operating mechanism, a transmission structure and a synchronous switch, wherein the transmission structure comprises a driving shaft arranged near the fracture structure on a transmission path between the operating mechanism and the fracture structure, and the synchronous switch comprises a simulated moving contact and a simulated static contact, wherein the simulated moving contact is transmission-connected to the driving shaft, so that the synchronous switch and the fracture structure can be opened and closed synchronously; an output crank arm hinged to an insulating pull rod is fixed on the driving shaft, one end of the driving shaft is fixedly connected to the output crank arm, and the other end is transmission-connected to the simulated moving contact. By measuring the switch signal of the synchronous switch with a mechanical characteristic analyzer, technical parameters such as the opening and closing time, synchronicity, and reclosing time of the high-voltage switchgear can be obtained, and the synchronous switch is arranged near the fracture structure on the transmission path, and the measurement data is relatively accurate, which can more accurately reflect the technical characteristics of the high-voltage switchgear.

Description

Technical Field

[0001] The invention relates to a high voltage switchgear. Background Art

[0002] High-voltage circuit breakers are mainly used to close and disconnect the load current of the line, to cut off the fault circuit in time when a fault occurs, and to prevent the accident from expanding and affecting the safety of the entire power grid. They play an important protective role in the operation of the power grid. High-voltage circuit breakers include a fracture structure, an operating mechanism and a transmission structure. The operating mechanism can drive the moving contact of the fracture structure to open and close the switch through the transmission structure. The transmission structure is provided with an insulating pull rod for directly connecting with the moving contact and for pushing and pulling the moving contact to open and close the switch.

[0003] At present, testing items such as the closing and breaking capacity of high-voltage circuit breakers can only be tested in special laboratories. It is difficult to accurately test the mechanical characteristics of circuit breakers running under power, whether in factory inspection or in subsequent power grid operation. It is impossible to discover problems of high-voltage circuit breakers running on the grid in advance based on the current mechanical characteristics of the high-voltage circuit breakers, which is not conducive to ensuring the stability of the operation of high-voltage circuit breakers and increases the risk of power grid failures caused by poor performance of high-voltage circuit breakers. Summary of the invention

[0004] The object of the present invention is to provide a high-voltage switchgear, which can solve the problem in the prior art that technical parameters such as the opening and closing time cannot be accurately measured when the switchgear is energized.

[0005] The high voltage switchgear of the present invention adopts the following technical solution:

[0006] High voltage switchgear, including:

[0007] A fracture structure, an operating mechanism, and a transmission structure transmitting between the operating mechanism and the fracture structure;

[0008] The transmission structure includes a driving shaft arranged near the fracture structure on the transmission path between the operating mechanism and the fracture structure, and the driving shaft drives the insulating pull rod to move under the action of the operating mechanism, thereby driving the fracture structure to open and close;

[0009] High voltage switchgear also includes:

[0010] A synchronous switch, comprising a simulated moving contact and a simulated static contact, wherein the simulated moving contact is connected to a driving shaft so that the synchronous switch and the fracture structure can be opened and closed synchronously, and the simulated moving contact and the simulated static contact are used to be electrically connected to a mechanical characteristic analyzer to obtain the opening and closing time, synchronization and reclosing time of the high-voltage switchgear;

[0011] An output crank arm hinged to the insulating pull rod is fixed on the driving shaft, one end of the driving shaft is fixedly connected to the output crank arm, and the other end is transmission-connected to the simulated moving contact. The driving shaft and the simulated moving contact are transmission-connected through a crank slider transmission structure. The simulated moving contact reciprocates with the slider or the simulated moving contact reciprocates as the slider of the crank slider transmission structure and cooperates with the simulated static contact sleeve. The crank slider structure includes a crank that rotates with the driving shaft and a connecting rod connecting the crank and the slider, and the length of the crank or connecting rod is adjustable.

[0012] Beneficial effects: When the high-voltage switchgear of the present invention is used, the driving shaft drives the moving contact to move under the action of the operating mechanism to realize the opening and closing of the fracture structure. At the same time, the simulated moving contact is connected to the driving shaft in transmission, and cooperates with the simulated static contact to make the synchronous switch and the fracture structure open and close synchronously. The synchronous switch can transmit the same switch signal as the fracture structure to the mechanical property measuring instrument, and then the technical parameters such as the opening time, closing time, and synchronization of the high-voltage switchgear can be measured. The driving shaft is located on the side of the transmission path between the operating mechanism and the fracture structure, close to the fracture structure. The synchronization between the driving shaft and the fracture structure is good, which can reduce the measurement error caused by the transmission path and can more accurately reflect the technical characteristics of the fracture structure. By adopting this high-voltage switchgear, it is possible to detect whether the mechanical characteristics are qualified under power during factory inspection, and online monitoring can be achieved during grid operation. Problems with high-voltage switchgear running on the grid can be discovered in advance, reducing maintenance costs, and improving the stability of high-voltage switchgear. It is beneficial to reduce grid failures caused by poor performance of high-voltage switchgear, ensure electricity safety, and further improve the intelligence level of power equipment. The rotation of the driving shaft is well converted into the reciprocating motion of the simulated moving contact through the crank slider structure. The crank slider structure is relatively simple and convenient to process. The simulated moving contact and the simulated static contact are closely matched and stable. The synchronous switch is not prone to poor contact and looseness, and has good durability. The consistency of the synchronous switch and the fracture structure can be achieved by adjusting the length, and the adjustment is relatively convenient.

[0013] Furthermore, the length of the connecting rod is adjustable, and the connecting rod includes a front connecting section, a rear connecting section and a threaded adjusting section, the threaded adjusting section is serially connected between the front connecting section and the rear connecting section, and both are threadedly connected to the front connecting section and the rear connecting section.

[0014] Beneficial effect: The length of the connecting rod can be adjusted through thread matching, and the adjustment of the length of the connecting rod is more convenient and accurate.

[0015] Furthermore, the connecting rod is connected to the slider by a ball joint, the length of the connecting rod is adjustable, the connecting rod includes two front and rear sections connected by threads, and the connecting rod is extended or shortened when the section connected to the slider is screwed.

[0016] Beneficial effects: The slider has a high degree of freedom when moving, which is conducive to ensuring full contact and cooperation between the simulated moving contact and the simulated static contact, and can reduce the loss generated during the operation of the simulated static contact and the simulated moving contact; the connecting rod length can be adjusted through thread cooperation, and the connecting rod length adjustment is more convenient and accurate.

[0017] Furthermore, the simulated static contact is a tube sleeve structure, the simulated moving contact constitutes a slider of a crank slider structure, the simulated static contact constitutes a guide rail for guiding the slider, and one of the simulated moving contact or the simulated static contact has an insulating section and a conductive section in its length direction.

[0018] Beneficial effect: when the simulated moving contact slides from the insulating section to the conductive section, the synchronous switch just closes; when the simulated moving contact slides from the conductive section to the insulating section, the synchronous switch just opens; with the above structure, the synchronous switch has fewer internal parts and a simpler structure.

[0019] Furthermore, the high-voltage switchgear includes an angular displacement sensor mounted on the driving shaft.

[0020] Beneficial effect: After installing the angular displacement sensor, more mechanical characteristic parameters such as the opening speed and closing speed of the high-voltage switchgear can be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a partial structural schematic diagram of a specific embodiment 1 of the high-voltage switchgear of the present invention (the operating mechanism is not shown);

[0022] Figure 1 Middle: 1-static contact; 2-moving contact; 3-output crank arm; 4-insulating pull rod; 5-driving shaft; 6-crank; 7-insulating connecting rod; 8-simulated moving contact; 9-simulated static contact; 91-insulating section; 92-conductive section. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0025] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0026] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0027] Specific embodiment 1 of the high voltage switchgear of the present invention:

[0028] The high voltage switchgear of the present invention, Figure 1 As shown, it includes a housing, an operating mechanism, a fracture structure and a transmission structure connected between the operating mechanism and the fracture structure, and the transmission structure, the operating mechanism and the fracture structure are all located inside the housing. The fracture structure includes a static contact 1 and a moving contact 2, and the transmission structure includes a drive shaft 5 installed on the housing, the drive shaft 5 can rotate under the output of the operating mechanism, and the drive shaft 5 is arranged close to the fracture structure on the transmission path between the operating mechanism and the fracture structure. In other words, the drive shaft 5 is located at the end of the transmission structure, and there are fewer transmission elements between the drive shaft 5 and the fracture structure.

[0029] by Figure 1 The coordinate system shown is used as a reference, the drive shaft 5 extends along the Y direction, and an output crank arm 3 that can rotate with the drive shaft 5 is fixedly arranged, and the other end of the output crank arm 3 is hinged to the insulating pull rod 4, and the insulating pull rod 4 is hinged to the moving contact 2 of the fracture structure. The output crank arm 3 is arranged vertically to the drive shaft 5 and is located in the plane where the X axis and the Z axis intersect. During the rotation of the drive shaft 5, the output crank arm 3 can be driven to rotate, and then the insulating pull rod 4 pushes and pulls the moving contact 2 to perform the opening and closing action.

[0030] In the present high voltage switchgear, a synchronous switch is provided at the driving shaft, which can be opened and closed together with the fracture structure. The synchronous switch includes a simulated static contact 9 and a simulated moving contact 8. Figure 1 As shown, the simulated moving contact 8 and the simulated static contact 9 are both located in the plane where the X-axis and the Z-axis intersect. The simulated static contact 9 is a tube sleeve structure, which is installed on the housing. The simulated moving contact 8 is connected to the driving shaft 5 through a crank slider structure transmission. The driving shaft 5 is fixedly connected with a crank 6 that can rotate with the driving shaft 5. The crank 6 is connected to the simulated moving contact 8 through a connecting rod 7, wherein the crank 6 is hinged to the connecting rod 7, and the other end of the connecting rod 7 is ball-jointed with the simulated moving contact 8. The simulated moving contact 8 constitutes a slider of the crank slider structure, which is located inside the simulated static contact 9 and can reciprocate under the guidance of the simulated static contact 9. The simulated static contact 9 constitutes a guide rail for guiding the simulated moving contact 8 to move directly.

[0031] A conductive segment 92 and an insulating segment 91 are provided on the simulated static contact 9 along the length direction, and the junction between the two is exactly the rigid opening point and the rigid closing point of the synchronous switch. When in use, the simulated moving contact 8 can slide in the simulated static contact 9. When the simulated moving contact 8 slides from the insulating segment 91 to the conductive segment 92, the synchronous switch is turned on, otherwise the synchronous switch is turned off.

[0032] The actual operation process of the high-voltage switch is as follows: when the driving shaft 5 rotates counterclockwise, the output crank arm 3 drives the insulating pull rod 4 to pull the contact 2 down, the fracture structure is opened, and the crank 6 rotates counterclockwise with the driving shaft 5, the simulated moving contact 8 moves to the right, slides from the conductive section 92 to the insulating section 91, and the synchronous switch is disconnected; when the crank arm 5 rotates clockwise, the output crank arm 3 drives the insulating pull rod 4 to push the contact 2, the fracture structure is closed, and the crank 6 rotates clockwise with the driving shaft 5, the simulated moving contact 8 moves to the left, slides from the insulating section 91 to the conductive section 92, and the synchronous switch is closed. In this embodiment, the simulated moving contact and the connecting rod 7 are ball-jointed, which can enable the simulated moving contact 8 to automatically adjust its posture when it contacts and cooperates with the simulated static contact 9, ensuring that the simulated moving contact 8 and the simulated static contact 9 are in good contact and cooperation.

[0033] Two signal lines are led out from the conductive segments 92 of the simulated moving contact 8 and the simulated static contact 9, and connected to the analog information input terminal of the mechanical characteristics tester. The synchronous switch is adjusted so that when the fracture structure of the high-voltage switch device reaches the just-closed point, the synchronous switch also reaches the just-closed point. Subsequently, during the energized operation, the high-voltage switch device and the synchronous switch output synchronized switching signals. The switching signals of the synchronous switch are measured by the mechanical characteristics measuring instrument to obtain technical parameters such as the opening and closing time, synchronicity, and reclosing time of the high-voltage switch device.

[0034] In this embodiment, the length of the connecting rod 7 is adjustable, and the connecting rod 7 includes two sections (not shown in the figure) that are mutually inserted and threaded in the length direction, and the length of the connecting rod 7 can be adjusted by screwing a section connected to the simulated moving contact 8 through a ball joint pair. Before the high-voltage switch equipment leaves the factory, the consistency of the synchronous switch and the fracture structure is achieved by adjusting the length of the connecting rod 7. The specific adjustment steps are: connecting the moving contact and the static contact to the detection instrument, so that the fracture structure opens and closes, and when the fracture structure just reaches the opening point or the closing point, the fracture structure is kept at the current position, and the length of the connecting rod 7 is adjusted so that the simulated moving contact 8 just reaches the junction of the conductive section and the insulating section, and the adjustment is completed. In fact, in other embodiments, other components of the synchronous switch can be adjusted to achieve the consistency of the synchronous switch and the fracture structure, for example: moving the position of the simulated static contact on the housing; setting the crank to a length-adjustable structure to adjust the length of the crank; or changing the circumferential position of the crank on the drive shaft, etc. The adjustment method is very flexible.

[0035] Since the driving shaft 5 drives the crank 6 and the output crank arm 3 to rotate at the same time, in order to ensure that the driving shaft 5 is evenly stressed in the axial direction and not easily damaged, the crank 6 and the output crank arm 3 are respectively installed and fixed at the axial ends of the driving shaft 5.

[0036] The high-voltage switchgear of the present invention is provided with a synchronous switch on the transmission path between the operating mechanism and the fracture structure, close to the fracture structure. The synchronous switch outputs a more accurate signal with a smaller measurement error. A stronger and more durable plug-in mechanical switch is used, which is not easy to loosen or be damaged after repeated use.

[0037] By adopting the present invention, the initial technical parameter values ​​of the high-voltage switchgear can be recorded before leaving the factory, so as to provide original data for the maintenance and overhaul of the high-voltage switchgear in the later stage. In the subsequent operation process, not only the operation of the high-voltage switchgear can be monitored online to improve the intelligence level of the power equipment, but also the current technical parameters can be analyzed and compared with the initial technical parameter values, the operation stability of the high-voltage switchgear can be analyzed, and the quality trend of the subsequent operation of the high-voltage switchgear can be predicted. Therefore, problems with the high-voltage switchgear in the grid can be discovered in advance, the maintenance cost can be reduced, and the grid failures caused by the poor performance of the high-voltage switchgear can be reduced.

[0038] In addition, an angular displacement sensor can be installed on the driving shaft 5, thereby obtaining more technical parameters such as the opening speed and closing speed of the high-voltage switchgear; the high-voltage switchgear in this embodiment is a high-voltage circuit breaker, and in other embodiments, it can also be a switchgear such as an isolating switch and a grounding switch, a gas-insulated metal-enclosed switch, an AC metal-enclosed switchgear and a control device.

[0039] Specific embodiment 2 of the high voltage switchgear of the present invention:

[0040] Different from Example 1, the connecting rod is hinged to the simulated moving contact, and the connecting rod includes front and rear connecting sections and a threaded adjustment section threadedly connected between the front and rear connecting sections. The front and rear connecting sections are used to be hinged to the connecting rod and the crank respectively, and the length of the connecting rod can be adjusted by screwing the threaded adjustment section.

[0041] Specific embodiment 3 of the high voltage switchgear of the present invention:

[0042] Different from Example 1, the simulated moving contact is a tube sleeve structure, and the simulated static contact is a rod structure. When the synchronous switch is opened and closed, the simulated moving contact is sleeved outside the simulated static contact and cooperates with the simulated static contact sliding guide.

[0043] Specific embodiment 4 of the high voltage switchgear of the present invention:

[0044] Different from the first embodiment, the simulated static contact is made of a conductive material, and the simulated moving contact is provided with a conductive segment and an insulating segment in the length direction, and the junction between the conductive segment and the insulating segment is the rigid opening point and the rigid closing point of the synchronous switch.

[0045] Specific embodiment 5 of the high voltage switchgear of the present invention:

[0046] Different from Example 1, the connecting rod includes an outer sleeve and an inner rod. A long hole is provided on the outer sleeve along the length direction. A stud fixed on the inner rod extends from the long hole and is used to cooperate with a nut to keep the outer sleeve and the inner rod fixed. After the stud and the nut are loosened, the inner rod can be slid along the inside of the outer sleeve, thereby completing the length adjustment of the connecting rod.

[0047] Specific embodiment 6 of the high voltage switchgear of the present invention:

[0048] Different from Example 1, the length of the connecting rod is not adjustable, but the length of the crank is adjustable. The crank includes front and rear connecting sections and a threaded adjustment section threadedly connected between the front and rear connecting sections. The front connecting section is used to be fixedly connected to the driving shaft, and the rear connecting section is used to be hinged to the connecting rod. The length of the crank can be adjusted by screwing the threaded adjustment section.

[0049] Alternatively, in other embodiments, the crank includes an outer sleeve and an inner rod, and a long hole is provided on the outer sleeve along the length direction. A stud fixed on the inner rod extends from the long hole and is used to cooperate with a nut to keep the outer sleeve and the inner rod fixed. After the stud and the nut are loosened, the inner rod can be slid along the inside of the outer sleeve, thereby completing the length adjustment of the crank.

[0050] Specific embodiment 7 of the high voltage switchgear of the present invention:

[0051] Different from Example 1, the crank slider structure includes a slider, a crank and a connecting rod connected between the slider and the crank, the crank is fixedly connected to the driving shaft, one end of the connecting rod is hinged to the crank, and the other end is matched with the slider ball joint, the other end of the slider is fixedly connected to the simulated moving contact through a pull rod, and a cylindrical slide rail and a simulated static contact of a sleeve structure are fixed on the shell. When the synchronous switch is opened and closed, the slider is guided by the slide rail and drives the simulated moving contact in and out of the simulated static contact. In this embodiment, the simulated static contact is made of conductive material.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A high voltage switchgear, comprising: A fracture structure, an operating mechanism, and a transmission structure transmitting between the operating mechanism and the fracture structure; The transmission structure includes a driving shaft arranged near the fracture structure on the transmission path between the operating mechanism and the fracture structure, and the driving shaft drives the insulating pull rod to move under the action of the operating mechanism, thereby driving the fracture structure to open and close; Its characteristics are: High voltage switchgear also includes: A synchronous switch, comprising a simulated moving contact and a simulated static contact, wherein the simulated moving contact is connected to a driving shaft so that the synchronous switch and the fracture structure can be opened and closed synchronously, and the simulated moving contact and the simulated static contact are used to be electrically connected to a mechanical characteristic analyzer to obtain the opening and closing time, synchronization and reclosing time of the high-voltage switchgear; An output crank arm hinged to the insulating pull rod is fixed on the driving shaft, one end of the driving shaft is fixedly connected to the output crank arm, and the other end is transmission-connected to the simulated moving contact. The driving shaft and the simulated moving contact are transmission-connected through a crank slider transmission structure. The simulated moving contact reciprocates with the slider or the simulated moving contact reciprocates as the slider of the crank slider transmission structure and cooperates with the simulated static contact sleeve. The crank slider structure includes a crank that rotates with the driving shaft and a connecting rod connecting the crank and the slider, and the length of the crank or connecting rod is adjustable.

2. The high voltage switchgear according to claim 1, characterized in that: The length of the connecting rod is adjustable. The connecting rod comprises a front connecting section, a rear connecting section and a threaded adjusting section. The threaded adjusting section is connected in series between the front connecting section and the rear connecting section and is threadedly connected to the front connecting section and the rear connecting section.

3. The high voltage switchgear according to claim 1, characterized in that: The connecting rod is connected to the slider by a ball joint, the length of the connecting rod is adjustable, the connecting rod comprises two front and rear sections connected by threads, and the connecting rod is extended or shortened when the section connected to the slider is screwed.

4. The high voltage switchgear according to any one of claims 1 to 3, characterized in that: The simulated static contact is a tube sleeve structure, the simulated moving contact constitutes a slider of a crank slider structure, the simulated static contact constitutes a guide rail for guiding the slider, and one of the simulated moving contact or the simulated static contact has an insulating section and a conductive section in its length direction.

5. The high voltage switchgear according to any one of claims 1 to 3, characterized in that: The high voltage switchgear includes an angular displacement sensor mounted on a drive shaft.

Images