Three-position disconnecting switch and GIS switch cabinet

Abstract

The utility model provides a three-position disconnecting switch and a GIS switch cabinet, belonging to the high voltage switch field, comprising an input shaft, a moving contact assembly, an upper static contact assembly, a lower static contact assembly and a grounding contact assembly, the front and rear ends of the input shaft are rotatably supported on a front support plate and a rear support plate; the input shaft can be connected with a three-station operating mechanism; the moving contact assembly is arranged on the input shaft; the two ends of the upper static contact assembly, the two ends of the lower static contact assembly and the two ends of the grounding contact assembly are fixed to the front supporting plate and the rear supporting plate respectively, and the upper static contact assembly is located above the moving contact assembly. The upper end of the lower static contact assembly is rotatably connected to the lower end of the moving contact assembly. The grounding contact assembly is located below the moving contact assembly. The moving contact assembly, the upper static contact assembly, the lower static contact assembly and the grounding contact assembly are integrated and fixed on the front supporting plate and the rear supporting plate, so that the structure is compact, the size is small, the space occupation in the switch cabinet can be reduced, and the miniaturization of the switch cabinet is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-voltage switches, and in particular relates to a three-position isolating switch and a GIS switch cabinet equipped with the switch. Background Art

[0002] GIS (Gas-Insulated Switchgear) is the abbreviation for gas-insulated switchgear. GIS consists of circuit breakers, disconnectors, earthing switches, transformers, lightning arresters, busbars, connectors, and outgoing line terminals. These devices or components are all enclosed in a grounded metal casing filled with SF6 insulating gas at a certain pressure. However, existing GIS switchgear has shortcomings: due to the increasing number of devices and components inside the switchgear, each device and component requires a certain amount of space, resulting in a large switchgear size, making it unsuitable for miniaturized applications such as GIS switchgear and environmentally friendly switchgear. Otherwise, the cabinet is crowded, cables are easily entangled, and each device and component is a heat source, making it difficult to dissipate the heat inside the cabinet. These problems can cause electrical failures and affect the normal operation of the switchgear. Utility Model Content

[0003] The embodiment of the utility model provides a three-position isolating switch and a GIS switch cabinet with a compact structure, which can reduce the space occupied in the switch cabinet, is conducive to the miniaturization of the switch cabinet, and is also conducive to heat dissipation and component arrangement, thereby reducing the failure rate of the switch cabinet.

[0004] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a three-position isolating switch, comprising:

[0005] An input shaft, with both ends rotatably supported on the front support plate and the rear support plate; the input shaft can be connected to the three-position operating mechanism and rotated under the drive of the three-position operating mechanism;

[0006] A moving contact assembly is provided on the input shaft and rotates along with the input shaft;

[0007] An upper static contact assembly, with both ends respectively fixed to the front support plate and the rear support plate, and located above the moving contact assembly;

[0008] a lower static contact assembly, whose ends are respectively fixed to the front support plate and the rear support plate, and whose upper end is rotatably connected to the lower end of the moving contact assembly; and

[0009] The grounding contact assembly has two ends respectively fixed on the front support plate and the rear support plate, and is located below the moving contact assembly; the moving contact assembly rotates counterclockwise with the input shaft to connect the upper static contact assembly, and the disconnector is closed; or rotates clockwise with the input shaft to connect the grounding contact assembly, and the disconnector is grounded; when the moving contact assembly is in the middle position, the disconnector is opened.

[0010] In combination with the first aspect, in a feasible manner, the input shaft includes a knife switch insulating main shaft and a connecting shaft connected to the front and rear ends of the knife switch insulating main shaft, and the two connecting shafts are rotatably connected to the front support plate and the rear support plate respectively; the front and rear ends of the knife switch insulating main shaft are respectively provided with polygonal holes, and the connecting shaft is provided with a polygonal prism that matches the polygonal hole to achieve synchronous rotation of the knife switch insulating main shaft and the connecting shaft.

[0011] In combination with the first aspect, in one feasible method, an insulating crooked arm is provided on the insulating main shaft of the knife switch, the moving contact assembly is passed through the insulating crooked arm, and extends downward through the through hole on the insulating main shaft of the knife switch, and is rotatably connected to the lower static contact assembly below.

[0012] In combination with the first aspect, in one feasible manner, a plurality of large baffles are provided on the outer circumference of the insulating main shaft of the knife switch, and the large baffles are respectively provided between the three groups of moving contact assemblies.

[0013] In combination with the first aspect, in one achievable manner, the angles between the upper static contact assembly and the moving contact assembly, and between the grounding contact assembly and the moving contact assembly are both 50°-65°.

[0014] In combination with the first aspect, in one feasible manner, the upper static contact assembly includes an upper support beam fixed between the front support plate and the rear support plate, three groups of upper copper bars fixed at intervals on the upper support beam, and an upper static contact fixed on each of the upper copper bars.

[0015] In combination with the first aspect, in one feasible manner, the lower static contact assembly includes a lower support beam fixed between the front support plate and the rear support plate, and three groups of lower static contacts fixed at intervals on the lower support beam; the lower static contact passes through the through hole on the lower support beam and is fixed to the lower support beam through a copper busbar fixing plate.

[0016] In combination with the first aspect, in one feasible manner, the grounding contact assembly includes a grounding support beam fixed between the front support plate and the rear support plate, a grounding copper busbar fixed on the grounding support beam, and three groups of grounding contacts fixed at intervals on the grounding copper busbar.

[0017] In combination with the first aspect, in one achievable manner, observation holes are respectively provided on the front support plate and the rear support plate at positions corresponding to the closing position, the opening position and the grounding position.

[0018] In a second aspect, an embodiment of the present invention further provides a GIS switch cabinet equipped with the three-position isolating switch.

[0019] Compared to existing technologies, the three-position disconnector and GIS switchgear provided by this utility model offer the following advantages: the moving contact assembly, upper and lower static contact assemblies, and grounding contact assemblies are all integrated and fixed to the front and rear support plates. Closing, opening, and grounding switching are accomplished via a three-position operating mechanism connected to the input shaft. This compact structure, small size, and easy assembly reduce space usage within the switchgear, facilitate miniaturization, and improve air circulation and heat dissipation between components within the switchgear, as well as cable layout, thereby reducing the switchgear's failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the three-position isolating switch provided in the embodiment of the utility model Figure 1 ;

[0021] Figure 2 Schematic diagram of the three-position isolating switch provided in the embodiment of the utility model Figure 2 ;

[0022] Figure 3 A front structural diagram of a three-position disconnect switch provided in an embodiment of the present utility model;

[0023] Figure 4 Schematic diagram of the three-position disconnector provided by the embodiment of the utility model without the front and rear support plates Figure 1 ;

[0024] Figure 5 Schematic diagram of the three-position disconnector provided by the embodiment of the utility model without the front and rear support plates Figure 2 ;

[0025] Figure 6 A schematic diagram of the three-dimensional structure of the insulating main shaft of the knife switch of the three-position disconnector provided in an embodiment of the utility model;

[0026] Figure 7 A schematic diagram of the three-dimensional structure of the crank arm of the three-position disconnector provided in an embodiment of the present utility model;

[0027] Description of reference numerals:

[0028] 1. Front support plate; 11. Observation hole; 2. Upper static contact assembly; 21. Upper support beam; 22. Upper copper busbar; 23. Upper static contact; 3. Input shaft; 31. Connecting shaft; 32. Insulated crank arm; 33. Large baffle; 34. Small baffle; 35. Insulated main shaft of knife switch; 4. Moving contact assembly; 5. Grounding contact assembly; 51. Grounding contact; 52. Grounding support beam; 53. Grounding copper busbar; 6. Lower static contact assembly; 61. Lower support beam; 62. Lower static contact; 63. Copper busbar fixing plate; 7. Rear support plate. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to 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 intended to limit the present invention.

[0030] Please also refer to Figures 1 to 7 The three-position disconnector provided by the present invention is now described. The three-position disconnector comprises an input shaft 3, a movable contact assembly 4, an upper static contact assembly 2, a lower static contact assembly 6, and a grounding contact assembly 5. The front and rear ends of the input shaft 3 are rotatably supported on the front support plate 1 and the rear support plate 7. The input shaft 3 is connectable to the three-position operating mechanism and rotates driven by the three-position operating mechanism. The movable contact assembly 4 is disposed on the input shaft 3 and rotates with the input shaft 3. The upper static contact assembly 2 has its ends fixed to the front support plate 1 and the rear support plate 7, respectively, and is located above the movable contact assembly 4. The lower static contact assembly 6 has its ends fixed to the front support plate 1 and the rear support plate 7, respectively, and its upper end is rotatably connected to the lower end of the movable contact assembly 4.

[0031] The two ends of the grounding contact assembly 5 are respectively fixed on the front support plate 1 and the rear support plate 7, and are located below the moving contact assembly 4; the moving contact assembly 4 rotates counterclockwise with the input shaft 3 to connect the upper static contact assembly 2, and the disconnector is closed; or it rotates clockwise with the input shaft 3 to connect the grounding contact assembly 5, and the disconnector is grounded; when the moving contact assembly 4 is in the middle position, the disconnector is opened.

[0032] The three-position disconnect switch provided by the utility model has a movable contact assembly 4, an upper static contact assembly 2, a lower static contact assembly 6, and a grounding contact assembly 5, all integrally fixed to the front support plate 1 and the rear support plate 7. Closing, opening, and grounding switching are accomplished via a three-position operating mechanism connected to the input shaft 3. This compact structure, small size, and easy assembly can reduce space usage within the switchgear, facilitate miniaturization of the switchgear, and facilitate air circulation and heat dissipation between components within the switchgear, as well as cable layout, thereby reducing the failure rate of the switchgear.

[0033] In some embodiments, see Figures 1 to 7As shown, the input shaft 3 includes a knife switch insulating main shaft 35 and a connecting shaft 31 connected to the front and rear ends of the knife switch insulating main shaft 35. The two connecting shafts 31 are rotatably connected to the front support plate 1 and the rear support plate 7 respectively; the front and rear ends of the knife switch insulating main shaft 35 are respectively provided with polygonal holes, and the connecting shaft 31 is provided with a polygonal prism that matches the polygonal holes to achieve synchronous rotation of the knife switch insulating main shaft 35 and the connecting shaft 31. Optionally, the polygonal hole is a rectangular hole, a regular pentagonal hole, or a regular hexagonal hole. A radially protruding key block can also be provided on the connecting shaft 31 to achieve synchronous rotation of the knife switch insulating main shaft 35 and the connecting shaft 31.

[0034] This structural method is simple and convenient to assemble. The front support plate 1 and the rear support plate 7 are connected by the lower support beam 61, the upper support beam 21 and the ground support beam 52 to form a stable frame, which provides installation support for the upper static contact assembly 2, the lower static contact assembly 6 and the ground contact assembly 5, and directly limits the split input shaft 3 between the front support plate 1 and the rear support plate 7.

[0035] The diameter of the knife switch's insulating main shaft 35 is much larger than the diameter of the connecting shaft 31, providing reliable and stable support when the switch is closed and grounded. A through-hole for the movable contact assembly 4 is provided on the knife switch's insulating main shaft 35, and a relief notch is provided on the side facing the lower static contact assembly 6, allowing the lower static contact 62 to form a rotational connection with the movable contact assembly 4 at the relief notch. This reduces the vertical dimensions of the disconnector, facilitating overall miniaturization.

[0036] The knife switch insulating main shaft 35 of the present application is arranged in a suspended manner, which plays the role of driving the moving contact to move. After the knife switch insulating main shaft 35 moves, it is not subjected to force, thereby increasing the service life of the disconnector and enhancing the dynamic stability performance of the disconnector.

[0037] The front support plate 1 and the rear support plate 7 of the isolating switch of the present application are connected to the cabinet housing, thereby improving the mechanical stability and dynamic stability of the isolating switch.

[0038] In some embodiments, see Figures 1 to 7 As shown, an insulating crank arm 32 is mounted on the insulating main shaft 35 of the knife switch. The movable contact assembly 4 is inserted into the insulating crank arm 32 and extends downward through a through hole in the insulating main shaft 35 of the knife switch, pivotally connected to the lower static contact assembly 6 below. The three sets of movable contact assemblies 4 are each isolated by their own insulating crank arm 32 and rotate with the insulating main shaft 35 of the knife switch when the insulating crank arm 32 is moved. The outer side of the insulating crank arm 32 is provided with reinforcing fins that also serve to dissipate heat.

[0039] In some embodiments, see Figures 1 to 5As shown, a plurality of large baffles 33 are provided on the outer circumference of the knife switch insulating main shaft 35, and a large baffle 33 is provided between each of the three sets of moving contact assemblies 4. In order to improve the insulation isolation effect, each large baffle 33 is also configured with a small baffle 34 with a smaller diameter.

[0040] In some embodiments, see Figures 1 to 5 As shown, the angles between the upper static contact assembly 2 and the movable contact assembly 4, as well as between the grounding contact assembly 5 and the movable contact assembly 4, are both 50°-65°. The operation process of this application is as follows:

[0041] The isolating switch has three positions: closed, open, and earthed. The initial position of the isolating switch is the open position, and the moving contact neither contacts the upper static contact 23 nor the earthing contact 51; when the isolating switch is closed, the three-position operating mechanism rotates 60° counterclockwise, the moving contact contacts the upper static contact 23, and the isolating switch is closed; when the isolating switch is open, the three-position operating mechanism rotates 60° clockwise, the isolating switch is disconnected from the upper static contact 23 and does not contact the earthing contact 51, and the isolating switch is open; when the earthing switch is closed, the three-position operating mechanism rotates another 60° clockwise, the moving contact contacts the earthing contact 51, and the isolating switch is earthed; when the earthing switch is open, the three-position operating mechanism rotates 60° counterclockwise, the moving contact disengages from the earthing contact 51, and the isolating switch returns to the open position.

[0042] In some embodiments, see Figures 1 to 5 As shown, the upper static contact assembly 2 includes an upper support beam 21 fixed between the front support plate 1 and the rear support plate 7, three sets of upper copper bars 22 fixed to the upper support beam 21 at intervals, and upper static contacts 23 fixed to each upper copper bar 22. The front support plate 1 and the rear support plate 7 form a stable frame through the upper support beam 21, the lower support beam 61, and the ground support beam 52, which provides reliable support for each component and enables each component to be integrated on the frame, achieving a compact structure and small size.

[0043] In some embodiments, see Figures 1 to 5 As shown, the lower static contact assembly 6 includes a lower support beam 61 fixed between the front support plate 1 and the rear support plate 7, and three groups of lower static contacts 62 fixed at intervals on the lower support beam 61; the lower static contacts 62 pass through the through holes on the lower support beam 61 and are fixed to the lower support beam 61 through a copper busbar fixing plate 63.

[0044] In some embodiments, see Figures 1 to 5 As shown, the grounding contact assembly 5 includes a grounding support beam 52 fixed between the front support plate 1 and the rear support plate 7 , a grounding copper bus 53 fixed on the grounding support beam 52 , and three groups of grounding contacts 51 fixed on the grounding copper bus 53 at intervals.

[0045] In this application, the connections between the various components are made by bolt connection, which is conducive to the assembly and repair and replacement of damaged components; the ends of the moving contact, the upper static contact 23 and the grounding contact 51 are all provided with chamfers to achieve smooth opening and closing of the knife switch.

[0046] In some embodiments, see Figures 1 to 3 As shown, observation holes 11 are provided on the front support plate 1 and the rear support plate 7 at positions corresponding to the closing position, the opening position and the contacting position, respectively, so as to facilitate observation of the position of the disconnector.

[0047] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0048] Based on the same inventive concept, an embodiment of the present application also provides a GIS switch cabinet equipped with the three-position isolating switch.

[0049] The GIS switchgear provided by this utility model features a movable contact assembly, upper and lower static contact assemblies, and grounding contact assemblies, all integrated and fixed to the front and rear support plates. Closing, opening, and grounding switching are accomplished via a three-position operating mechanism connected to the input shaft. This compact structure, small size, and easy assembly reduce space usage within the switchgear, facilitate miniaturization, and improve air circulation and heat dissipation between components within the switchgear, as well as cable routing, thereby reducing the switchgear's failure rate.

[0050] The three-position disconnector provided in this application has a compact structure, uniform electric field distribution, and a partial discharge of less than 5PC, which is far superior to the 10PC standard required by the State Grid.

[0051] Because disconnectors are installed in sealed gas boxes such as GIS switchgear and environmental switchgear, the entire switchgear cannot be repaired if the disconnector fails. Therefore, the reliability of the disconnector is particularly important. The disconnector in this application requires no internal debugging and reliably performs closing, opening, and grounding functions under the control of a three-position operating mechanism. It has excellent electrical performance, a simple structure, and easy installation and debugging. It is widely used in high-speed railways, national power grids, data centers, and other important applications.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A three-position isolating switch, characterized in that: include: An input shaft (3) with both ends rotatably supported on a front support plate (1) and a rear support plate (7); the input shaft (3) can be connected to a three-position operating mechanism and rotated under the drive of the three-position operating mechanism; A moving contact assembly (4) is arranged on the input shaft (3) and rotates along with the input shaft (3); An upper static contact assembly (2), with both ends respectively fixed to the front support plate (1) and the rear support plate (7), and located above the moving contact assembly (4); A lower static contact assembly (6), both ends of which are fixed to the front support plate (1) and the rear support plate (7), and an upper end of which is rotatably connected to the lower end of the moving contact assembly (4); and The grounding contact assembly (5) has two ends respectively fixed on the front support plate (1) and the rear support plate (7), and is located below the moving contact assembly (4); the moving contact assembly (4) rotates counterclockwise with the input shaft (3) to connect the upper static contact assembly (2), and the disconnector is closed; or rotates clockwise with the input shaft (3) to connect the grounding contact assembly (5), and the disconnector is grounded; when the moving contact assembly (4) is in the middle position, the disconnector is opened.

2. The three-position disconnect switch according to claim 1, characterized in that: The input shaft (3) comprises a knife switch insulating main shaft (35) and a connecting shaft (31) connected to the front and rear ends of the knife switch insulating main shaft (35), and the two connecting shafts (31) are rotatably connected to the front support plate (1) and the rear support plate (7) respectively; the front and rear ends of the knife switch insulating main shaft (35) are respectively provided with polygonal holes, and the connecting shaft (31) is provided with a polygonal prism that matches the polygonal hole to achieve synchronous rotation of the knife switch insulating main shaft (35) and the connecting shaft (31).

3. The three-position disconnect switch according to claim 2, characterized in that: An insulating crank arm (32) is provided on the insulating main shaft (35) of the knife switch. The movable contact assembly (4) is inserted into the insulating crank arm (32) and extends downward through a through hole on the insulating main shaft (35) of the knife switch to be rotatably connected to the lower static contact assembly (6) below.

4. The three-position disconnect switch according to claim 2, characterized in that: A plurality of large baffles (33) are provided on the outer circumference of the knife switch insulating main shaft (35), and the large baffles (33) are respectively provided between the three groups of moving contact assemblies (4).

5. The three-position disconnect switch according to claim 1, characterized in that: The angles between the upper static contact assembly (2) and the moving contact assembly (4), and between the grounding contact assembly (5) and the moving contact assembly (4) are both 50°-65°.

6. The three-position disconnect switch according to claim 1, characterized in that: The upper static contact assembly (2) comprises an upper support beam (21) fixed between the front support plate (1) and the rear support plate (7), three groups of upper copper bars (22) fixed at intervals on the upper support beam (21), and upper static contacts (23) fixed on each of the upper copper bars (22).

7. The three-position disconnect switch according to claim 1, characterized in that: The lower static contact assembly (6) comprises a lower support beam (61) fixed between the front support plate (1) and the rear support plate (7), and three groups of lower static contacts (62) fixed at intervals on the lower support beam (61); the lower static contacts (62) pass through through holes on the lower support beam (61) and are fixed to the lower support beam (61) via a copper busbar fixing plate (63).

8. The three-position disconnect switch according to claim 1, characterized in that: The grounding contact assembly (5) comprises a grounding support beam (52) fixed between the front support plate (1) and the rear support plate (7), a grounding copper busbar (53) fixed on the grounding support beam (52), and three groups of grounding contacts (51) fixed at intervals on the grounding copper busbar (53).

9. The three-position disconnect switch according to claim 1, characterized in that: Observation holes (11) are respectively provided on the front support plate (1) and the rear support plate (7) at positions corresponding to the closing position, the opening position and the contacting position.

10. A GIS switch cabinet, characterized in that: The device is equipped with a three-position isolating switch as described in any one of claims 1 to 9.

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