Static contact unit, isolating switch and switching device

Abstract

The utility model belongs to the technical field of electrical equipment, and discloses a static contact unit, an isolating switch and a switching device, the static contact unit comprises an insulating support member, a first contact and a second contact, the insulating support member is provided with a first end and a second end, and the first end is configured to be installed on a frame of the isolating switch; the second contact is connected to the second end, the first contact is arranged on the second contact, and the first contact is configured to be used for being movably connected with a movable contact knife of the disconnecting switch. By arranging the insulating supporting piece, on one hand, the static contact unit can be installed on the framework of the disconnecting switch, and on the other hand, the framework of the disconnecting switch and the first contact used for being connected with the movable contact knife are arranged at the two ends of the insulating supporting piece respectively, so that a certain interval is formed between the first contact and the framework of the disconnecting switch; therefore, the safe distance between the phase and the ground is kept. Namely, the static contact unit can ensure that a safe distance is kept between the phase and the ground, and the electrical insulation performance of the isolating switch is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a static contact unit, a disconnector and a switching device. Background Art

[0002] In an electrical ring main unit, a disconnector connects or disconnects an electrical circuit by opening and closing a moving contact, and the moving contact blade is connected to an outgoing bus through a static contact unit. The existing arrangement of the static contact unit makes the distance between phases and the distance between a phase and the ground relatively short, making it difficult to ensure the electrical insulation performance of the disconnector.

[0003] For example, in some disconnectors, the static contact unit in each phase includes an L-shaped copper bar. A plurality of L-shaped copper bars are arranged at intervals. The horizontal plate of the L-shaped copper bar is mounted on an insulating contact seat and is used for connecting to the outgoing bus, and the vertical plate of the L-shaped copper bar is used for rotatably connecting to the moving contact blade. The above existing installation method of the static contact unit makes it difficult to ensure a certain safety distance between a phase and the ground, resulting in poor electrical insulation performance of the disconnector.

[0004] Therefore, there is an urgent need for a static contact unit, a disconnector and a switching device to solve the above problems in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a static contact unit, a disconnector and a switching device, which can ensure a safety distance between a phase and the ground and improve the electrical insulation performance of the disconnector.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] In a first aspect, a static contact unit is provided, which includes an insulating support, a first contact and a second contact;

[0008] The insulating support has a first end and a second end. The first end is configured to be mounted on the frame of the disconnector; the second contact is connected to the second end, the first contact is disposed on the second contact, and the first contact is configured to be movably connected to the moving contact blade of the disconnector.

[0009] As an optional solution of the static contact unit provided by the utility model, the second contact includes:

[0010] A first contact plate, which is attached to and connected to the end face of the second end;

[0011] A second contact plate, which protrudes from the side of the first contact plate facing away from the second end, and the first contact is connected to the second contact plate.

[0012] As an alternative solution of the static contact unit provided by the present utility model, an installation hole is provided on the second contact, and the first contact is connected through the installation hole.

[0013] As an alternative solution of the static contact unit provided by the present utility model, a first installation part and a second installation part are provided on the first contact;

[0014] The first installation part is used for movably connecting with the moving contact blade, the second installation part is configured to be connected with a lead wire, and the first installation part and the second installation part are respectively located on both sides of the second contact plate.

[0015] As an alternative solution of the static contact unit provided by the present utility model, the first contact is a flat plate.

[0016] As an alternative solution of the static contact unit provided by the present utility model, the static contact unit further includes a grading ring, and the grading ring is arranged at an interval from the first contact;

[0017] The static contact unit further includes a second fastener, a third fastener and a fourth fastener. The second fastener connects the first contact and the moving contact blade, the third fastener is configured to electrically connect the lead wire to the first contact, and the fourth fastener connects the first contact and the second contact;

[0018] The projections of the second fastener, the third fastener and the fourth fastener fall within the ring opening area of the grading ring.

[0019] As an alternative solution of the static contact unit provided by the present utility model, the static contact unit further includes a connecting piece;

[0020] The connecting piece includes a first connecting part, and a second connecting part and a third connecting part arranged on the first connecting part. The first connecting part is connected to the second contact, the second connecting part and the third connecting part both extend in a direction away from the first contact, and the second connecting part and the third connecting part are respectively connected to opposite sides of the grading ring.

[0021] As an alternative solution of the static contact unit provided by the present utility model, the material of the second contact is metal; and / or, the material of the connecting piece is metal.

[0022] As an alternative solution of the static contact unit provided by the present utility model, each static contact unit includes at least two grading rings, and the at least two grading rings are respectively arranged on opposite sides of the first contact.

[0023] In a second aspect, a disconnector is provided, which includes a frame and at least one static contact unit as described above, and the static contact unit is installed on the frame.

[0024] In a third aspect, a switching device is provided, including a circuit breaker, an earthing switch, and the disconnector as described above;

[0025] An interlocking mechanism is arranged between the circuit breaker, the earthing switch, and the disconnector. The interlocking mechanism is configured to lock the disconnector and the earthing switch after the circuit breaker is closed.

[0026] Advantages of the present utility model:

[0027] The present utility model provides a static contact unit, a disconnector, and a switching device. The first contact is connected to the insulating support through the second contact. The arrangement of the second contact provides an installation basis for the first contact, improving the installation convenience and stability of the first contact after installation. By providing the insulating support, on the one hand, the installation of the static contact unit on the frame of the disconnector can be realized. On the other hand, since the frame of the disconnector and the first contact for connecting the moving contact blade are located at both ends of the insulating support, a certain interval is formed between the first contact and the frame of the disconnector, thereby ensuring a safe distance between the phase and the ground. That is, the static contact unit can ensure a safe distance between the phase and the ground and improve the electrical insulation performance of the disconnector. Description of the drawings

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments of the present utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the drawings without creative efforts.

[0029] Figure 1 is an axonometric view of the disconnector provided by the specific embodiment of the present utility model;

[0030] Figure 2 is a side view of the disconnector provided by the specific embodiment of the present utility model;

[0031] Figure 3 is Figure 1 a partial enlarged view of part A in;

[0032] Figure 4 is a structural schematic diagram of the static contact unit provided by the specific embodiment of the present utility model;

[0033] Figure 5 is a structural schematic diagram of the second contact of the static contact unit provided by the specific embodiment of the present utility model.

[0034] In the figure:

[0035] 100, static contact unit; 200, frame; 300, moving contact blade; 400, linkage mechanism;

[0036] 401, disconnector operating shaft; 402, first connecting arm; 403, second connecting arm; 404, connecting block;

[0037] 1, insulating support; 2, first contact; 3, second contact; 4, first fastener; 5, grading ring; 6, second fastener; 7, fourth fastener; 8, connecting member; 9, fifth fastener;

[0038] 11, first end; 12, second end;

[0039] 21, second mounting portion;

[0040] 31, first contact plate; 32, second contact plate;

[0041] 321, mounting hole; 322, first fixing hole; 323, second fixing hole;

[0042] 51, ring opening area;

[0043] 81, first connecting portion; 82, second connecting portion; 83, third connecting portion. Detailed implementation mode

[0044] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0045] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0046] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0047] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for differentiation in description and have no special meaning.

[0048] The term "and / or" in this embodiment is only a correlative relationship describing the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present utility model generally represents an "or" relationship between the front and rear associated objects.

[0049] In the embodiments of the present utility model, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted.

[0050] As Figure 1 、 Figure 2 and Figure 3 shown, this embodiment provides a static contact unit 100, which can be applied in a disconnector, can ensure the safety distance between phases and between phase and ground, save costs, reduce the non-uniformity of the electric field at the position of the static contact unit 100, and improve the electrical insulation performance of the disconnector.

[0051] One or more static contact units 100 can be arranged in the disconnector. The number of the static contact units 100 is equal to the number of phases of the disconnector, and each phase is provided with a corresponding static contact unit 100 and a moving contact blade 300. Here, the number of the static contact units 100 in the disconnector is not limited.

[0052] Specifically, referring to Figure 1 、 Figure 2 and Figure 3, each static contact unit 100 includes an insulating support 1, a first contact 2, and a second contact 3. The first contact 2 is used to install the moving contact blade 300. The insulating support 1 has a first end 11 and a second end 12. The first end 11 is configured to be installed on the frame 200 of the disconnector; the second contact 3 is connected to the second end 12 of the insulating support 1. The first contact 2 is disposed on the second contact 3, and the first contact 2 is movably connected to the moving contact blade 300 of the disconnector.

[0053] The first contact 2 is connected to the insulating support 1 through the second contact 3. The setting of the second contact 3 provides an installation foundation for the first contact 2, improving the installation convenience and stability of the first contact 2 after installation. By providing the insulating support 1, on the one hand, the installation of the static contact unit 100 on the frame 200 of the disconnector can be realized. On the other hand, since the frame 200 of the disconnector and the first contact 2 for connecting the moving contact blade 300 are respectively disposed at both ends of the insulating support 1, there is a certain interval between the first contact 2 and the frame 200 of the disconnector, thereby achieving a safe distance between the phase and the ground. That is, the static contact unit 100 can ensure a safe distance between the phase and the ground and improve the electrical insulation performance of the disconnector.

[0054] Exemplarily, the moving contact blade 300 is rotatably installed on the first contact 2, and the opening and closing of the moving contact blade 300 are realized by driving the moving contact blade 300 to rotate relative to the first contact 2.

[0055] In this embodiment, the first contact 2 is a flat plate, which has a simple structure and is easy to manufacture, without complex processing techniques, and can improve production efficiency and save costs. Further, when multiple static contact units 100 are provided in the disconnector, optionally, the first contacts 2 of the multiple static contact units 100 are arranged parallel to each other, which is beneficial to ensuring the safe distance between phases.

[0056] Exemplarily, the first contact 2 is made of T2 copper or other materials with high conductivity, so that the first contact 2 has high conductivity, reduces the resistance on the first contact 2, and further can reduce the heat generation at the position of the first contact 2.

[0057] Exemplarily, for the purpose of facilitating the description of the static contact unit 100 provided in this embodiment, a first direction, a second direction, and a third direction are introduced for explanation. Among them, multiple static contact units 100 in the disconnecting switch are arranged at intervals along the first direction. The second end 12 of the insulating support 1 is located on one side of its first end 11 along the second direction. The first contact 2 is a flat plate extending along the third direction, and its thickness direction is the first direction. Among them, the first direction, the second direction, and the third direction are perpendicular to each other pairwise. Since the first contact 2 extends along the third direction perpendicular to the first direction instead of along the first direction, the first contacts 2 in adjacent phases can be kept at a relatively large distance, so as to achieve a safe distance between phases. Moreover, the first end 11 and the second end 12 of the insulating support 1 are arranged at intervals along the second direction, which can ensure to the greatest extent that there is a certain interval between both the first contact 2 and the second contact 3 and the frame 200 of the disconnecting switch, so as to achieve a safe distance between phase and ground.

[0058] In order to maintain a certain safe distance between phase and ground, in some existing disconnecting switches, the static contact unit is installed on the frame of the disconnecting switch through an insulating bracket to achieve electrical isolation between the static contact unit and the frame (grounded) of the disconnecting switch. However, multiple-phase static contact units are jointly arranged on the same insulating bracket, and the relative positions of the static contact units are fixed, resulting in a low assembly fault tolerance rate. Moreover, when the part of the static contact unit used for connecting with the moving contact blade is severely worn and damaged, only the entire insulating bracket can be replaced, resulting in waste of materials and an increase in maintenance and replacement costs.

[0059] In this embodiment, each static contact unit 100 includes an insulating support 1 for installing the first contact 2 of the corresponding phase, rather than the first contacts 2 of multiple static contact units 100 being jointly connected to the same insulating bracket. Therefore, each static contact unit 100 can be independently installed without being restricted by each other, which can improve the assembly fault tolerance rate. And when necessary, only the insulating support 1 of the corresponding static contact unit 100 needs to be replaced, which is beneficial to saving materials and reducing maintenance and replacement costs.

[0060] Exemplarily, the insulating support 1 is a column extending along the second direction to achieve electrical isolation between the first contact 2 and the frame 200. Of course, the insulating support 1 can also extend obliquely relative to the frame 200, and its cross-sectional shape can be circular, square, oval, other polygons, etc., which are not limited here, as long as it is ensured that the second end 12 is located on one side of the first end 11 along the second direction, so that there is an interval between the first contact 2 and the frame 200 in the second direction.

[0061] In some embodiments, the insulating support 1 is cast from epoxy resin or other insulating materials, which can improve the manufacturing efficiency while ensuring good insulating performance.

[0062] See Figure 3, the static contact unit 100 further includes a first fastener 4, and the second contact 3 is fixedly installed at the second end 12 of the insulating support 1 through the first fastener 4. Exemplarily, the first fastener 4 is a screw, and the screw passes through the second contact 3 and is threadedly connected to the insulating support 1, which is stable and convenient for installation.

[0063] Specifically, the second contact 3 includes a first contact plate 31 and a second contact plate 32 connected to each other. The first contact plate 31 is attached to the end face of the second end 12 of the insulating support 1 and is connected to the second end 12 through the first fastener 4, realizing the stable connection of the entire second contact 3 to the second end 12 of the insulating support 1. The second contact plate 32 protrudes from a side of the first contact plate 31 facing away from the second end 12 of the insulating support 1, and the first contact 2 is disposed on the second contact plate 32. For example, the first contact 2 is inserted through the second contact plate 32 or directly welded to the second contact plate 32, as long as the connection of the first contact 2 to the second contact plate 32 can be achieved.

[0064] The frame 200 of the disconnecting switch is connected to the end face of the first end 11 of the insulating support 1, and the first contact plate 31 is connected to the end face of the second end 12 of the insulating support 1, so that the distance between the first contact 2 and the second contact 3 and the frame 200 is maximized, achieving better electrical isolation, ensuring that a safe distance can be maintained between the phase and the ground, and improving the electrical insulation performance of the disconnecting switch.

[0065] Specifically in this embodiment, an installation hole 321 is provided on the second contact plate 32, and the first contact 2 is inserted and fixed in the installation hole on the second contact plate 32, realizing the connection between the first contact 2 and the second contact 3. The second contact 3 provides an installation basis for the first contact 2, and moreover, the way of inserting and fixing the first contact 2 can improve the stability after fixation.

[0066] Exemplarily, the second contact plate 32 is disposed at a 90-degree angle with the first contact plate 31, that is, the entire second contact 3 is in a T shape. The installation hole 321 penetrates through the second contact plate 32 along the third direction, so that the first contact 2 inserted into the installation hole 321 can extend along the third direction.

[0067] Exemplarily, the second contact 3 is made of a metal material, so that the second contact 3 has a sufficiently high strength to avoid deformation of the second contact 3, thereby improving the fixing stability of the first contact 2. For example, the second contact 3 is made of copper or stainless steel, and of course, other hard metal materials can also be used.

[0068] Further, the first contact 2 penetrates the second contact plate 32 in the third direction. A first mounting portion (not shown in the figure) and a second mounting portion 21 are provided on the first contact 2. The first mounting portion is used to realize the rotational connection between the first contact 2 and the moving contact blade 300. The second mounting portion 21 is configured to be connected to a lead wire, which is the outgoing busbar of the disconnector. The first mounting portion and the second mounting portion 21 are respectively located on opposite sides of the second contact plate 32 along the third direction. Refer to Figure 4 , the first mounting portion is located above the second contact plate 32, and the second mounting portion 21 is located below the second contact plate 32, realizing the connection between the upper end of the first contact 2 and the moving contact blade 300, and the connection between the lower end of the first contact 2 and the lead wire. The middle part of the first contact 2 is used for passing through and fixing with the second contact plate 32, with a more compact and reasonable structure and convenient operation during assembly.

[0069] Exemplarily, the static contact unit 100 further includes a second fastener 6 and a third fastener. The first mounting portion includes a first connection hole provided on the first contact 2. The second fastener 6 passes through the first connection hole and is used to connect the first contact 2 and the moving contact blade 300, realizing the rotational mounting of the moving contact blade 300 on the first contact 2. The second mounting portion 21 includes a second connection hole provided on the first contact 2. The third fastener passes through the second connection hole and is used to conductively connect the lead wire to the first contact 2, realizing the electrical connection between the moving contact blade 300 and the lead wire.

[0070] Exemplarily, the second fastener 6 and the third fastener are bolts or screws, etc.

[0071] Refer to Figure 2 , the static contact unit 100 further includes a fourth fastener 7, and the fourth fastener 7 connects the first contact 2 and the second contact 3. Specifically, in combination with Figure 5 , a first fixing hole 322 is provided on the second contact plate 32 of the second contact 3, and a third connection hole (not shown in the figure) is provided on the first contact 2. The fourth fastener 7 passes through the first fixing hole 322 and extends into the third connection hole, realizing the fixation of the first contact 2 and the second contact 3.

[0072] Exemplarily, the fourth fastener 7 is a screw, and one of the first fixing hole 322 and the third connection hole is a threaded hole, and the other is a smooth hole. The fourth fastener 7 is screwed into the threaded hole to fix the first contact 2 on the second contact plate 32.

[0073] Refer to Figure 1 、 Figure 3 And Figure 4 , the static contact unit 100 further includes a grading ring 5. The grading ring 5 is spaced from the first contact 2. Specifically, in this embodiment Figure 1 , the grading ring 5 is spaced from the first contact 2 in the first direction. The grading ring 5 is used to improve the electric field shape around the static contact unit 100, reduce the electric field non-uniformity, and improve the electrical insulation performance.

[0074] At the positions where the second fastener 6, the third fastener and the fourth fastener 7 are arranged on the first contact 2, a sharp tip structure is easily formed due to the fastening force, and the electric field distortion at the position of the sharp tip structure is extremely high, that is, at the positions of the second fastener 6, the third fastener and the fourth fastener 7, the local electric field strength is too high, which is easy to cause local discharge, thereby accelerating insulation aging, reducing insulation performance, and even causing insulation damage. Moreover, current concentration or abnormal distribution may occur at the electric field distortion location, causing local overheating, affecting the normal operation of the power equipment, and causing equipment failure. Severe electric field distortion may directly lead to insulation breakdown under certain conditions, causing the disconnector to lose its normal function and causing power system failure.

[0075] Therefore, the size of the pressure equalizing ring 5 needs to satisfy the following requirement: the projections of the second fastener 6, the third fastener, and the fourth fastener 7 along the first direction fall within the ring opening area 51 of the pressure equalizing ring 5, such as Figure 2 As shown, the ring opening area 51 of the voltage-equalizing ring 5 can cover the positions of the second fastener 6, the third fastener and the fourth fastener 7, that is, cover the positions with high electric field distortion, improve the electric field shape at these positions, reduce the electric field non-uniformity, and enhance the electrical insulation performance.

[0076] Exemplarily, the voltage-grading ring 5 is made of a metal round tube or a metal round rod. After the voltage-grading ring 5 is provided, an electrostatic field simulation is performed on the static contact unit 100 provided in this embodiment. According to the simulation results, the maximum field strength on the static contact unit 100 is 5.6 kV / mm, which is less than the breakdown field strength of dry air 7.5 kV / mm, and the insulation performance is excellent.

[0077] See also Figure 3 and Figure 4 The stationary contact unit 100 further includes a connecting member 8 for connecting the voltage-equalizing ring 5 to the second contact 3 , and for spacing the voltage-equalizing ring 5 from the first contact 2 .

[0078] Specifically, the connecting member 8 includes a first connecting portion 81 and a second connecting portion 82 and a third connecting portion 83 arranged on the first connecting portion 81. The first connecting portion 81 is attached to and connected to the second contact plate 32 of the second contact 3. The second connecting portion 82 and the third connecting portion 83 both extend in a direction away from the first contact 2, and the second connecting portion 82 and the third connecting portion 83 are respectively connected to opposite sides of the pressure equalizing ring 5 to achieve a stable installation of the pressure equalizing ring 5. The second connecting portion 82 and the third connecting portion 83 are symmetrically arranged relative to the center of the pressure equalizing ring 5, so that the force on the pressure equalizing ring 5 is balanced.

[0079] The second connection part 82 and the third connection part 83 are both bent and connected to the first connection part 81 to form a U-shaped connection member 8, which can be bent into a vehicle body as a whole and is easy to manufacture.

[0080] See alsoFigure 2 , the first connecting portion 81 is fixedly connected to the second contact plate 32 through the fifth fastener 9. Combining Figure 5 , the second contact plate 32 is provided with a second fixing hole 323. The fifth fastener 9 passes through the first connecting portion 81 and extends into the second fixing hole 323 to realize the installation of the connecting member 8 on the second contact plate 32. The fifth fastener 9 is exemplarily a screw. Further, a second fixing hole 323 is provided on each of the opposite sides of the first fixing hole 322. Using two fifth fasteners 9 to fix the connecting member 8 can improve the installation stability of the grading ring 5.

[0081] In this embodiment, the materials of the second contact 3 and the connecting member 8 are both electrically conductive metals, ensuring that the grading ring 5 can play a role in uniforming the electric field.

[0082] In this embodiment, the second connecting portion 82 and the third connecting portion 83 of the connecting member 8 are both spot-welded to the grading ring 5, which is convenient to operate and has a high connection stability.

[0083] Preferably, each static contact unit 100 includes at least two grading rings 5. The at least two grading rings 5 are respectively arranged on the opposite sides of the first contact 2 along the first direction, avoiding partial discharge of the static contact unit 100 towards the adjacent static contact unit 100 and improving the electrical insulation performance between phases. As Figure 1 , Figure 3 and Figure 4 shown, each static contact unit 100 includes two grading rings 5, and the two grading rings 5 are respectively arranged on the two sides of the first contact 2 along the first direction.

[0084] As Figure 1 and Figure 2 shown, this embodiment also provides a disconnecting switch, which includes a frame 200 and at least one static contact unit 100 as described above. The static contact unit 100 is installed on the frame 200 through an insulating support 1. The disconnecting switch with the static contact unit 100 can improve the insulation performance between phases and between phase and ground, and can improve the assembly fault tolerance rate, save materials and reduce the maintenance and replacement cost.

[0085] See Figure 1 and Figure 2, the disconnecting switch further includes a linkage mechanism 400 for rotating and closing the moving contact blade 300. The linkage mechanism 400 includes a disconnecting switch operating shaft 401, a first connecting arm 402, a second connecting arm 403, and a connecting block 404. The disconnecting switch operating shaft 401 is rotatably arranged on the frame 200 around its own axis. The first connecting arm 402 is fixedly arranged on the disconnecting switch operating shaft 401. One end of the second connecting arm 403 is hinged to the first connecting arm 402, and the other end is hinged to the connecting block 404. The connecting block 404 is slidably arranged on the moving contact blade 300 along the extending direction of the moving contact blade 300. The first connecting arm 402, the second connecting arm 403, the connecting block 404, and the moving contact blade 300 form a four-bar linkage mechanism. When driving the disconnecting switch operating shaft 401 to rotate, it can drive the moving contact blade 300 to rotate relative to the first contact 2, realizing the closing and opening of the disconnecting switch.

[0086] This embodiment also provides a switch device, which can be applied in a switch cabinet and includes a circuit breaker, an earthing switch, and the disconnecting switch as described above. An interlocking mechanism is arranged between the circuit breaker, the earthing switch, and the disconnecting switch. The interlocking mechanism is used to lock the disconnecting switch and the earthing switch after the circuit breaker is closed. The linkage between the interlocking mechanism and the circuit breaker, the earthing switch, and the disconnecting switch is a mature existing technology and will not be elaborated here.

[0087] The beneficial effects of the switch device with the disconnecting switch provided in this embodiment are as described above.

[0088] It can be understood that the disconnecting switch provided in this embodiment can also be used alone to realize closing and opening, or can be applied in the above-mentioned switch device and used in cooperation with the circuit breaker and the earthing switch.

[0089] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. The stationary contact unit is characterized in that: It comprises an insulating support member (1), a first contact (2) and a second contact (3); The insulating support member (1) has a first end (11) and a second end (12), the first end (11) being configured to be mounted on a frame (200) of the isolating switch; the second contact (3) is connected to the second end (12), the first contact (2) is arranged on the second contact (3), and the first contact (2) is configured to be movably connected to a movable contact blade (300) of the isolating switch.

2. The stationary contact unit according to claim 1, characterized in that: The second contact (3) comprises: A first touch plate (31) is attached to and connected to an end surface of the second end (12); The second touch plate (32) is protrudingly arranged on a side of the first touch plate (31) facing away from the second end (12), and the first contact (2) is connected to the second touch plate (32).

3. The stationary contact unit according to claim 2, characterized in that: The second contact plate (32) is provided with a mounting hole (321), and the first contact (2) is penetrated and connected to the mounting hole (321).

4. The stationary contact unit according to claim 2, characterized in that: The first contact (2) is provided with a first mounting portion and a second mounting portion (21); The first mounting portion is used for being movably connected to the movable touch knife (300), the second mounting portion (21) is configured for being connected to a lead wire, and the first mounting portion and the second mounting portion (21) are respectively located on two sides of the second touch plate (32).

5. The stationary contact unit according to claim 1, characterized in that: The first contact (2) is a flat plate.

6. The stationary contact unit according to any one of claims 1 to 5, characterized in that: The stationary contact unit (100) further comprises a voltage equalizing ring (5), wherein the voltage equalizing ring (5) is arranged at a distance from the first contact (2); The stationary contact unit (100) further comprises a second fastener (6), a third fastener and a fourth fastener (7), wherein the second fastener (6) connects the first contact (2) and the movable contact blade (300), the third fastener is configured to connect a lead wire to the first contact (2) in an electrically conductive manner, and the fourth fastener (7) connects the first contact (2) and the second contact (3); The projections of the second fastener (6), the third fastener and the fourth fastener (7) fall within the ring opening area (51) of the pressure equalizing ring (5).

7. The stationary contact unit according to claim 6, characterized in that: The stationary contact unit (100) further comprises a connecting piece (8); The connecting member (8) comprises a first connecting portion (81) and a second connecting portion (82) and a third connecting portion (83) arranged on the first connecting portion (81), the first connecting portion (81) is connected to the second contact (3), the second connecting portion (82) and the third connecting portion (83) both extend in a direction away from the first contact (2), and the second connecting portion (82) and the third connecting portion (83) are respectively connected to opposite sides of the equalizing ring (5).

8. The stationary contact unit according to claim 6, characterized in that: Each of the static contact units (100) comprises at least two equalizing rings (5), and the at least two equalizing rings (5) are arranged on two opposite sides of the first contact (2).

9. Isolating switch, characterized in that: It comprises a frame (200) and at least one stationary contact unit according to any one of claims 1 to 8, wherein the stationary contact unit (100) is mounted on the frame (200).

10. A switch device, characterized in that comprising a circuit breaker, a grounding switch and an isolating switch as claimed in claim 9; An interlocking mechanism is provided between the circuit breaker, the grounding switch and the isolating switch, and the interlocking mechanism is used to lock the isolating switch and the grounding switch after the circuit breaker is closed.

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