Gas-insulated switchgear

Abstract

The utility model belongs to the technical field of power equipment, and particularly relates to an inflatable cabinet. The circuit breaker, the first isolation switch and the second isolation switch are arranged in the gas-insulated switchgear provided by the utility model, the second isolation switch is connected with the hydraulic transmission unit, and the hydraulic transmission unit drives the second isolation switch to be at the closing position for connecting the second terminal and the second wire outlet seat. When a short-circuit fault occurs in a power system, the hydraulic transmission unit is higher in response speed compared with an existing lead screw transmission structure, rapid grounding of the isolation switch on the wire outlet side can be achieved, and the service life of the isolation switch on the wire outlet side can be prolonged. And the damage degree of the gas-insulated switchgear or the electrical elements of the power system caused by factors such as short-circuit faults is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to an inflatable cabinet. Background Art

[0002] The gas cabinet is an important component of power equipment and has been widely used in various power fields. It is equipped with a circuit breaker and a disconnector. In some application fields, such as a 72.5kV power system, the gas cabinet is usually required to be equipped with an upper disconnector, a lower disconnector and a circuit breaker. The upper disconnector corresponds to the incoming line side of the gas cabinet, and the lower disconnector corresponds to the outgoing line side of the gas cabinet. When a short circuit fault occurs in the power system, the circuit breaker is disconnected first, and then the lower disconnector and the upper disconnector are driven to disconnect. However, only the lower disconnector is connected to the grounding contact to cut off the power supply, but it cannot meet the use requirements of some specific application scenarios. In addition, in the prior art, the drive transmission device that drives the lower disconnector is a screw transmission structure, which has a slow transmission response speed and cannot achieve rapid grounding of the lower disconnector, increasing the risk of damaging the gas cabinet or the electrical components of the power system due to factors such as short circuit faults. Utility Model Content

[0003] The purpose of the utility model is to provide an inflatable cabinet, which can realize rapid grounding of the second isolating switch, thereby reducing the degree of damage to the inflatable cabinet or electrical components of the power system due to factors such as short circuit faults.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] An inflatable cabinet, comprising:

[0006] A cabinet body, wherein a first wiring terminal and a second wiring terminal are provided on the cabinet body, and a first grounding contact and a second grounding contact are provided in the cabinet body;

[0007] A circuit breaker is arranged in the cabinet, and the circuit breaker includes a first outlet seat and a second outlet seat;

[0008] a first isolating switch, disposed in the cabinet, for connecting or disconnecting the first terminal and the first outlet seat, or for connecting with the first grounding contact;

[0009] The second isolating switch is arranged in the cabinet, and the second isolating switch is connected to a hydraulic transmission unit. The hydraulic transmission unit is used to drive the second isolating switch to connect or disconnect the second terminal and the second outlet seat, or to drive the second isolating switch to connect with the second grounding contact.

[0010] As an optional technical solution for the above-mentioned inflatable cabinet, the first isolating switch is connected to the hydraulic transmission unit, and the hydraulic transmission unit is used to drive the first isolating switch to connect or disconnect the first terminal and the first outlet seat, or to drive the first isolating switch to connect with the first grounding contact.

[0011] As an optional technical solution of the above-mentioned inflatable cabinet, the hydraulic transmission unit includes:

[0012] a hydraulic cylinder connected to the cabinet;

[0013] a piston rod, one end of which is slidably disposed in the hydraulic cylinder and the other end of which is disposed outside the hydraulic cylinder;

[0014] A connecting rod assembly, one end of which is fixedly connected to the other end of the piston rod, and the other end of which is slidably connected to the second isolating switch or the first isolating switch, and the piston rod slides relative to the hydraulic cylinder so that the connecting rod assembly drives the second isolating switch or the first isolating switch to rotate.

[0015] As an optional technical solution of the above-mentioned inflatable cabinet, the second isolating switch and the first isolating switch are respectively provided with a plurality of them, and each of the second isolating switch and each of the first isolating switch is respectively provided with a long hole;

[0016] The connecting rod assembly includes a first connecting rod, a second connecting rod and a side connecting rod. The first connecting rod and the second connecting rod are arranged in parallel and spaced apart, and the first connecting rod is connected to the second connecting rod through the side connecting rod. The first connecting rod is fixedly connected to the other end of the piston rod. The second connecting rod is sequentially inserted into the long holes of multiple second isolating switches or the long holes of multiple first isolating switches, and the second connecting rod is slidably connected to the long holes. The second connecting rod is an insulating member.

[0017] As an optional technical solution of the above-mentioned inflatable cabinet, the second isolating switch includes a second isolating contact piece, one end of the second isolating contact piece is hinged to the second terminal, and the other end of the second isolating contact piece is used to connect to the second outlet seat or the second grounding contact;

[0018] The first isolating switch includes a first isolating contact piece, one end of which is hinged to the first terminal, and the other end of which is used to be connected to the first outlet seat or the first grounding contact.

[0019] As an optional technical solution of the above-mentioned inflatable cabinet, the first isolating contact piece and the second isolating contact piece each include two blades, the two blades are parallel and spaced apart, the first ends of the two blades are hinged to the first terminal or the second terminal, the second ends of the two blades of the first isolating contact piece are used to clamp the first outlet seat or the first grounding contact, and the second ends of the two blades of the second isolating contact piece are used to clamp the second outlet seat or the second grounding contact.

[0020] As an optional technical solution of the above-mentioned inflatable cabinet, each of the blades is provided with a first long groove, and the first long groove passes through the second end portion of the blade.

[0021] As an optional technical solution for the above-mentioned inflatable cabinet, the second grounding contact includes an L-shaped grounding contact plate, the first end of the grounding contact plate is connected to the cabinet body, the second end of the grounding contact plate can be placed between the two blades, and the second end of the grounding contact plate is provided with a second long groove, and the second long groove passes through the second end portion of the grounding contact plate.

[0022] As an optional technical solution of the above-mentioned inflatable cabinet, one end of the circuit breaker is connected to the inner wall of the cabinet, and the other end of the circuit breaker extends in a direction parallel to the vertical direction of the cabinet when it is installed.

[0023] As an optional technical solution of the above-mentioned inflatable cabinet, at least two groups of second wiring terminals are provided on the cabinet body, the circuit breaker is provided with a second outlet seat corresponding to each group of the second wiring terminals, the cabinet body is provided with a second grounding contact corresponding to each group of the second wiring terminals, and each group of the second wiring terminals is respectively provided with a second isolating switch.

[0024] Beneficial effects of the utility model:

[0025] The inflatable cabinet provided by the present invention is provided with a circuit breaker, a first isolating switch and a second isolating switch. The first isolating switch and the second isolating switch respectively have closing, opening and grounding positions to realize the conduction, disconnection or grounding of the circuit in the inflatable cabinet. When a short circuit fault occurs in the power system or when maintenance is carried out, the first isolating switch and the second isolating switch can both be grounded. The first isolating switch and the second isolating switch both have the ability to close the short-circuit current and open and close the induced current, which can meet some application scenarios with specific requirements, so that the inflatable cabinet can effectively play a protective role, improve the safety performance of the inflatable cabinet, and thus improve the safety performance of the power system; the second isolating switch The disconnector is connected to a hydraulic transmission unit, which drives the second disconnector to be in a closed position connected to the second terminal and the second outlet seat, or drives the second disconnector to be in an open position disconnected from the second terminal and the second outlet seat, or drives the second disconnector to connect to the second grounding contact. When a short circuit fault occurs in the power system, the hydraulic transmission unit responds faster than the existing screw transmission structure, and can achieve rapid grounding of the second disconnector on the outlet side, avoiding the second disconnector from being eroded by arcing for a long time and causing welding, and also reducing the degree of damage to the electrical components of the inflatable cabinet or the power system due to factors such as short circuit faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is an isometric view of the internal structure of the inflatable cabinet provided by one embodiment of the present utility model;

[0027] Figure 2 This is a structural diagram of a hydraulic transmission unit provided by an embodiment of the present utility model;

[0028] Figure 3 This is a front view of the internal structure of the inflatable cabinet provided by one embodiment of the utility model;

[0029] Figure 4 This is an isometric view of the internal structure of an inflatable cabinet provided by another embodiment of the present invention;

[0030] Figure 5 It is a structural schematic diagram of a first wiring terminal and a second wiring terminal provided in one embodiment of the present utility model.

[0031] In the picture:

[0032] 1. Cabinet; 2. First grounding contact; 3. Second grounding contact; 4. Circuit breaker; 5. First disconnect switch; 6. Second disconnect switch; 7. Hydraulic transmission unit;

[0033] 11. First terminal; 12. Second terminal;

[0034] 21. The third long groove;

[0035] 31. Ground contact plate; 32. Second long slot;

[0036] 41. First outlet seat; 42. Second outlet seat;

[0037] 51. First isolating contact member; 511. Blade; 512. First long slot; 513. Long hole;

[0038] 61. Second isolating contact member;

[0039] 71. Hydraulic cylinder; 72. Piston rod; 73. Connecting rod assembly; 731. First connecting rod; 732. Second connecting rod; 733. Side connecting rod. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0041] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0044] like Figure 1 As shown, this embodiment provides an inflatable cabinet that can be applied to an offshore wind turbine tower. The inflatable cabinet includes a cabinet body 1, a circuit breaker 4, a first isolating switch 5, and a second isolating switch 6. The cabinet body 1 is provided with a first terminal 11 and a second terminal 12, and the cabinet body 1 is provided with a first grounding contact 2 and a second grounding contact 3. The circuit breaker 4, the first isolating switch 5, and the second isolating switch 6 are all arranged in the cabinet body 1, and the circuit breaker 4 includes a first outlet seat 41 and a second outlet seat 42. The first isolating switch 5 is used to connect or disconnect the first terminal 11 and the first outlet seat 41, or to connect to the first grounding contact 2. The second isolating switch 6 is connected to a hydraulic transmission unit 7, and the hydraulic transmission unit 7 is used to drive the second isolating switch 6 to connect or disconnect the second terminal 12 and the second outlet seat 42, or to drive the second isolating switch 6 to connect to the second grounding contact 3.

[0045] The first isolating switch 5 and the second isolating switch 6 respectively have closing, opening and grounding positions to realize the conduction, disconnection or grounding of the circuit in the inflatable cabinet. When a short circuit fault occurs in the power system or during maintenance, the first isolating switch 5 and the second isolating switch 6 can be grounded. The first isolating switch 5 and the second isolating switch 6 have the ability to close the short-circuit current and open and close the induced current, which can meet some application scenarios with specific requirements, so that the inflatable cabinet can effectively play a protective role, improve the safety performance of the inflatable cabinet, and thus improve the safety performance of the power system; the second isolating switch 6 is connected to the hydraulic transmission unit 7, the hydraulic transmission unit 7 The second isolating switch 6 is driven to the closed position connecting the second terminal 12 and the second outlet seat 42, or the second isolating switch 6 is driven to the open position disconnecting the second terminal 12 and the second outlet seat 42, or the second isolating switch 6 is driven to connect the second grounding contact 3. When a short circuit fault occurs in the power system, the hydraulic transmission unit 7 has a faster response speed than the existing screw transmission structure, and can realize the rapid grounding of the second isolating switch 6 on the outlet side, avoiding the second isolating switch 6 from being subjected to arc erosion for a long time and causing welding, and also reducing the degree of damage to the electrical components of the inflatable cabinet or the power system due to factors such as short circuit faults.

[0046] For example, if the first terminal 11 is an incoming terminal, then the second terminal 12 is an outgoing terminal. Conversely, if the first terminal 11 is an outgoing terminal, then the second terminal 12 is an incoming terminal. In this embodiment, the first terminal 11 is an incoming terminal, and the second terminal 12 is an outgoing terminal.

[0047] In some embodiments, the first isolating switch 5 is connected to a hydraulic transmission unit 7 (the connection of the first isolating switch 5 to the hydraulic transmission unit 7 is not shown in the figure). The hydraulic transmission unit 7 is used to drive the first isolating switch 5 to connect or disconnect the first terminal 11 and the first outlet seat 41, or to drive the first isolating switch 5 to connect with the first grounding contact 2. When a short circuit occurs in the power system, the hydraulic transmission unit 7 has a faster response speed than existing screw transmission structures, enabling rapid grounding of the first isolating switch 5, preventing the first isolating switch 5 from being subjected to arcing erosion for a long time and causing welding, and further reducing the degree of damage to the electrical components of the inflatable cabinet or the power system due to factors such as short circuits.

[0048] Reference Figure 1 and Figure 2 As shown, optionally, the hydraulic transmission unit 7 includes a hydraulic cylinder 71, a piston rod 72, and a connecting rod assembly 73. The hydraulic cylinder 71 is connected to the cabinet 1. Specifically, the hydraulic cylinder 71 is arranged on the inside of the cabinet 1. One end of the piston rod 72 is slidably arranged in the hydraulic cylinder 71, and the other end of the piston rod 72 is placed outside the hydraulic cylinder 71. One end of the connecting rod assembly 73 is fixedly connected to the other end of the piston rod 72, and the other end of the connecting rod assembly 73 is slidably connected to the second isolating switch 6 or the first isolating switch 5. The piston rod 72 slides relative to the hydraulic cylinder 71, so that the connecting rod assembly 73 drives the second isolating switch 6 or the first isolating switch 5 to rotate. The hydraulic cylinder 71 can be filled with a liquid such as hydraulic oil. The change in the amount of liquid in the hydraulic cylinder 71 can change the position of the piston rod 72 in the hydraulic cylinder 71, thereby driving the connecting rod assembly 73 to operate. The hydraulic transmission unit 7 has a simple structure and drives the connecting rod assembly 73 in a direct-acting manner, resulting in a fast response speed.

[0049] In some other embodiments, the first isolating switch 5 is connected to a screw transmission mechanism, which drives the first isolating switch 5 to connect or disconnect the first terminal 11 and the first outlet seat 41, or drives the first isolating switch 5 to connect with the first grounding contact 2. The screw transmission mechanism is a prior art and is not specifically limited here.

[0050] Multiple second isolating switches 6 and multiple first isolating switches 5 are provided. Typically, the inflatable cabinet receives and outputs three-phase electricity. Therefore, for one set of inputs and one set of outputs, three second isolating switches 6 and three first isolating switches 5 are provided. Corresponding to the first isolating switches 5 are three first wiring terminals 11, three first outlet sockets 41, and three first grounding contacts 2. Corresponding to the second isolating switches 6 are three second wiring terminals 12, three second outlet sockets 42, and three second grounding contacts 3. Each second isolating switch 6 and each first isolating switch 5 is provided with a slot 513. The connecting rod assembly 73 includes a first connecting rod 731, a second connecting rod 732, and a side connecting rod 733. The first connecting rod 731 and the second connecting rod 732 are arranged parallel to each other and spaced apart. The first connecting rod 731 is connected to the second connecting rod 732 via the side connecting rod 733. The first connecting rod 731 is fixedly connected to the other end of the piston rod 72. The second connecting rod 732 is sequentially inserted into the elongated holes 513 of the plurality of second isolating switches 6 or the elongated holes 513 of the plurality of first isolating switches 5, and is slidably connected to the elongated holes 513. The second connecting rod 732 is an insulating member. The second connecting rod 732 serves to connect the plurality of first isolating switches 5 or second isolating switches 6, allowing them to operate synchronously. The first connecting rod 731 and the side connecting rod 733 can also be insulating members, further improving the insulation performance of the connecting rod assembly 73.

[0051] There are three second isolating switches 6 and three first isolating switches 5 respectively, and there are at least two side connecting rods 733. At least one side connecting rod 733 is provided between every two adjacent second isolating switches 6 or every two adjacent first isolating switches 5. While connecting the first connecting rod 731 and the second connecting rod 732, the second connecting rod 732 is evenly stressed, thereby smoothly driving multiple second isolating switches 6 or multiple first isolating switches 5 to rotate.

[0052] like Figure 3 As shown, in some embodiments, the second isolating switch 6 includes a second isolating contact member 61. One end of the second isolating contact member 61 is hingedly connected to the second terminal 12, and the other end of the second isolating contact member 61 is used to connect to the second outlet seat 42 or the second grounding contact 3. When the other end of the second isolating contact member 61 is connected to the second grounding contact 3, the second terminal 12 can be directly grounded. The second terminal 12 does not need to be equipped with an additional corresponding component such as a grounding switch, which simplifies the structure and reduces costs.

[0053] The first isolating switch 5 includes a first isolating contact member 51, one end of which is hingedly connected to the first terminal 11, and the other end of which is connected to the first outlet holder 41 or the first grounding contact 2. When the other end of the first isolating contact member 51 is connected to the first grounding contact 2, the first terminal 11 can be directly grounded, eliminating the need for additional components such as a grounding switch, resulting in a simple structure and reduced costs.

[0054] The arrangement of the above-mentioned second isolation contact piece 61 and the first isolation contact piece 51 enables the internal structure of the entire inflatable cabinet to achieve a copper-bar-free design, reduces contact points, makes the inflatable cabinet more reliable, has a more compact structure, reduces the size of the inflatable cabinet, and meets the application scenario requirements of small spaces.

[0055] Optionally, each of the first and second isolating contact members 51 and 61 includes two blades 511, which are arranged in parallel and spaced apart. The first ends of the blades 511 are hinged to the first terminal 11 or the second terminal 12. The second ends of the blades 511 of the first isolating contact member 51 are used to clamp the first outlet holder 41 or the first grounding contact 2, while the second ends of the blades 511 of the second isolating contact member 61 are used to clamp the second outlet holder 42 or the second grounding contact 3. The first and second isolating contact members 51 and 61 each utilize two blades 511 connected in parallel. By shunting current, the two blades 511 can reduce heat generation and the ability to withstand short-circuit currents. This reduces the contact clamping force requirements for the first and second isolating contact members 51 and 61, while also meeting the mechanical strength requirements of the first and second isolating contact members 51 and 61. The two blades 511 are arranged in parallel, which will generate current in the same direction, and then generate an electromagnetic force that attracts each other, thereby increasing the clamping force of the first isolating contact piece 51 and the second isolating contact piece 61. If a short circuit occurs in the power system, a huge electromagnetic force will be generated between the two blades 511, causing the two blades 511 to tightly clamp the first outlet seat 41 or the second outlet seat 42, ensuring that the circuit breaker 4 is disconnected first, thereby extinguishing the arc. Then, the second isolating switch 6 and the first isolating switch 5 are disconnected, reducing the contact resistance and preventing the blades 511 from being welded due to excessive current. When the first isolating switch 5 is connected to the first grounding contact 2, or the second isolating switch 6 is connected to the second grounding contact 3, the first isolating switch 5 or the second isolating switch 6 will not be separated from the first grounding contact 2 or the second grounding contact 3 due to the action of the electric force, causing an arc and a phase-to-phase short circuit.

[0056] Further optionally, each blade 511 is provided with a first long groove 512, which runs through the second end portion of the blade 511 to reduce the stiffness of the blade 511, reduce the eddy current formed on the blade 511 by the current, and increase the clamping force of the two blades 511.

[0057] The aforementioned elongated hole 513 is provided on the blade 511 and extends along the length of the blade 511. One end of the first elongated slot 512 passes through the second end of the blade 511, and the other end of the first elongated slot 512 is provided with the elongated hole 513 and extends toward the first end of the blade 511. The width of the first elongated slot 512 is smaller than the width of the elongated hole 513. Preferably, both the first elongated slot 512 and the elongated hole 513 are provided in the middle of the width of the blade 511.

[0058] Combine Figure 1 and Figure 3 As shown, in some embodiments, the second grounding contact 3 includes an L-shaped grounding contact plate 31. The first end of the grounding contact plate 31 is connected to the cabinet 1, and the second end of the grounding contact plate 31 can be placed between the two blades 511. The second end of the grounding contact plate 31 is provided with a second long slot 32, and the second long slot 32 passes through the second end of the grounding contact plate 31. The second long slot 32 is provided on the grounding contact plate 31 to reduce the rigidity of the grounding contact plate 31 and increase the clamping force of the two blades 511 on the grounding contact plate 31.

[0059] Optionally, the first grounding contact 2 is a plate-like structure, and a third long groove 21 can be set on the first grounding contact 2. The first end of the first grounding contact 2 is connected to the cabinet 1, and the third long groove 21 passes through the second end of the first grounding contact 2 to reduce the stiffness of the first grounding contact 2 and increase the clamping force of the two blades 511 to clamp the first grounding contact 2.

[0060] In some embodiments, one end of the circuit breaker 4 is connected to the inner wall of the cabinet 1, and the other end of the circuit breaker 4 extends in a direction parallel to the vertical direction of the cabinet 1 when it is installed, that is, the circuit breaker 4 is ensured to be in a vertical state, avoiding the problem of horizontal arrangement of the circuit breaker 4, which causes the circuit breaker 4 to sag due to its own gravity, increases installation errors, poor seismic resistance, and reduced reliability.

[0061] The circuit breaker 4 can be a vacuum circuit breaker or an SF circuit breaker. If a vacuum circuit breaker is used, a circuit breaker with a sealed pole or a bracket structure can be used. The sealed pole type circuit breaker is preferred. While achieving arc extinguishing, it makes the structure of the gas cabinet more compact and reduces the size of the gas cabinet.

[0062] like Figure 4 and Figure 5As shown, in another embodiment, at least two groups of second terminals 12 are provided on the cabinet 1, and second outlet seats 42 corresponding to each group of second terminals 12 are provided on the circuit breaker 4. Second grounding contacts 3 corresponding to each group of second terminals 12 are provided in the cabinet 1, and each group of second terminals 12 is respectively provided with a second isolating switch 6. Multiple second isolating switches 6 can be arranged on both sides of the circuit breaker 4. Any arrangement of the first isolating switch 5 and the multiple second isolating switches 6 is within the protection scope of this application. In application scenarios requiring a relatively large capacity, a one-input and multiple-output solution is achieved by increasing the volume of the inflatable cabinet. Preferably, the second terminal 12 is the outlet terminal, and the first terminal 11 is the input terminal, so as to achieve a one-input and multiple-output solution. At least two groups of second outlet seats 42 are provided on a circuit breaker 4 to shorten the current flow path and reduce the size of the inflatable cabinet.

[0063] Typically, three-phase electricity is input and output into and out of the inflatable cabinet. For example, each group of second wiring terminals 12 includes three second wiring terminals 12. Corresponding to each group of second wiring terminals 12, each group has three second isolating switches 6, three second outlet sockets 42, and three second grounding contacts 3.

[0064] The first terminal 11 includes an incoming line bushing, one end of which passes through the cabinet 1 and is placed inside the cabinet 1 . One end of the incoming line bushing is hinged to the first isolating contact 51 , and the other end of the incoming line bushing is used to connect the incoming cable.

[0065] The second terminal 12 includes an outlet bushing, one end of which passes through the cabinet 1 and is placed inside the cabinet 1 . One end of the outlet bushing is hinged to the second isolation contact 61 , and the other end of the outlet bushing is used to connect the outlet cable.

[0066] The material of the cabinet 1 is 316 stainless steel. Molybdenum is added to 316 stainless steel, which has better corrosion resistance, especially chloride corrosion resistance and heat resistance. It is particularly suitable for environments in marine environments or chemical fields that may be exposed to salt water or acidic solutions.

[0067] The inflatable cabinet provided by the present invention can be grounded when a short circuit occurs in the power system or when undergoing maintenance. The first isolating switch 5 and the second isolating switch 6 both have the ability to close short-circuit currents and open and close induced currents, which can meet certain application scenarios with specific requirements, allowing the inflatable cabinet to effectively play a protective role, improving the safety performance of the inflatable cabinet, and thereby improving the safety performance of the power system. When a short circuit occurs in the power system, the hydraulic transmission unit 7 has a faster response speed than the existing screw transmission structure, and can quickly ground the second isolating switch 6 on the outgoing line side, avoiding the second isolating switch 6 from being subjected to arc erosion for a long time and causing welding, and also reducing the degree of damage to the electrical components of the inflatable cabinet or the power system due to factors such as short circuits.

[0068] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An inflatable cabinet, characterized in that: include: A cabinet (1), wherein a first wiring terminal (11) and a second wiring terminal (12) are provided on the cabinet (1), and a first grounding contact (2) and a second grounding contact (3) are provided inside the cabinet (1); A circuit breaker (4) is arranged in the cabinet (1), and the circuit breaker (4) comprises a first outlet seat (41) and a second outlet seat (42); A first isolating switch (5) is disposed in the cabinet (1) and is used to connect or disconnect the first terminal (11) and the first outlet seat (41), or to connect to the first grounding contact (2); A second isolating switch (6) is arranged in the cabinet (1), and the second isolating switch (6) is connected to a hydraulic transmission unit (7). The hydraulic transmission unit (7) is used to drive the second isolating switch (6) to connect or disconnect the second terminal (12) and the second outlet seat (42), or to drive the second isolating switch (6) to connect with the second grounding contact (3).

2. The inflatable cabinet according to claim 1, characterized in that: The first isolating switch (5) is connected to the hydraulic transmission unit (7), and the hydraulic transmission unit (7) is used to drive the first isolating switch (5) to connect or disconnect the first terminal (11) and the first outlet seat (41), or to drive the first isolating switch (5) to connect with the first grounding contact (2).

3. The inflatable cabinet according to claim 2, characterized in that: The hydraulic transmission unit (7) comprises: A hydraulic cylinder (71) connected to the cabinet (1); a piston rod (72), one end of the piston rod (72) being slidably disposed in the hydraulic cylinder (71), and the other end of the piston rod (72) being disposed outside the hydraulic cylinder (71); A connecting rod assembly (73), one end of the connecting rod assembly (73) is fixedly connected to the other end of the piston rod (72), and the other end of the connecting rod assembly (73) is slidably connected to the second isolating switch (6) or the first isolating switch (5), and the piston rod (72) slides relative to the hydraulic cylinder (71), so that the connecting rod assembly (73) drives the second isolating switch (6) or the first isolating switch (5) to rotate.

4. The inflatable cabinet according to claim 3, characterized in that: The second isolating switch (6) and the first isolating switch (5) are respectively provided in plurality, and each of the second isolating switch (6) and each of the first isolating switch (5) is respectively provided with a long hole (513); The connecting rod assembly (73) includes a first connecting rod (731), a second connecting rod (732) and a side connecting rod (733). The first connecting rod (731) and the second connecting rod (732) are arranged in parallel and spaced apart, and the first connecting rod (731) is connected to the second connecting rod (732) through the side connecting rod (733). The first connecting rod (731) is fixedly connected to the other end of the piston rod (72). The second connecting rod (732) is sequentially inserted into the long holes (513) of multiple second isolating switches (6) or the long holes (513) of multiple first isolating switches (5), and the second connecting rod (732) is slidably connected to the long holes (513). The second connecting rod (732) is an insulating member.

5. The inflatable cabinet according to any one of claims 1 to 4, characterized in that: The second isolating switch (6) comprises a second isolating contact piece (61), one end of the second isolating contact piece (61) is hinged to the second terminal (12), and the other end of the second isolating contact piece (61) is used to be connected to the second outlet seat (42) or the second grounding contact (3); The first isolating switch (5) comprises a first isolating contact piece (51), one end of the first isolating contact piece (51) is hinged to the first terminal (11), and the other end of the first isolating contact piece (51) is used to connect to the first outlet seat (41) or the first grounding contact (2).

6. The inflatable cabinet according to claim 5, characterized in that: The first isolating contact piece (51) and the second isolating contact piece (61) each comprise two blades (511), the two blades (511) being arranged in parallel and spaced apart, the first ends of the two blades (511) being hinged to the first terminal (11) or the second terminal (12), the second ends of the two blades (511) of the first isolating contact piece (51) being used for clamping the first outlet seat (41) or the first grounding contact (2), and the second ends of the two blades (511) of the second isolating contact piece (61) being used for clamping the second outlet seat (42) or the second grounding contact (3).

7. The inflatable cabinet according to claim 6, characterized in that: Each of the blades (511) is provided with a first long groove (512), and the first long groove (512) passes through the second end portion of the blade (511).

8. The inflatable cabinet according to claim 6, characterized in that: The second grounding contact (3) comprises an L-shaped grounding contact plate (31), a first end of the grounding contact plate (31) is connected to the cabinet (1), a second end of the grounding contact plate (31) can be placed between the two blades (511), and a second long slot (32) is provided at the second end of the grounding contact plate (31), and the second long slot (32) passes through the second end of the grounding contact plate (31).

9. The inflatable cabinet according to any one of claims 1 to 4, characterized in that: One end of the circuit breaker (4) is connected to the inner wall of the cabinet (1), and the other end of the circuit breaker (4) extends in a direction parallel to the vertical direction of the cabinet (1) when it is installed.

10. The inflatable cabinet according to any one of claims 1 to 4, characterized in that: At least two groups of second wiring terminals (12) are provided on the cabinet (1); a second outlet seat (42) corresponding to each group of second wiring terminals (12) is provided on the circuit breaker (4); a second grounding contact (3) corresponding to each group of second wiring terminals (12) is provided in the cabinet (1); and each group of second wiring terminals (12) is respectively provided with a second isolating switch (6).

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