Anti-flashover device and switch cabinet

Abstract

The application belongs to the field of switch devices, and specifically provides a flying arc prevention device and a switch cabinet. The flying arc prevention device comprises an arc extinguishing cover and an arc discharging structure. The arc extinguishing cover is used for being installed on a circuit breaker, and the arc discharging structure is used for being installed on a switch cabinet body. The arc discharging structure has an arc discharging channel inside for discharging an electric arc from one side of the switch cabinet, or the arc discharging structure forms the arc discharging channel with the switch cabinet body when in use. The arc extinguishing cover is in communication with the arc discharging structure to guide the electric arc generated by the circuit breaker to the arc discharging channel. The switch cabinet comprises the flying arc prevention device. The electric arc generated by the circuit breaker can be first preliminarily separated and cooled by the arc extinguishing cover, and then enter the arc discharging channel to be discharged from one side of the switch cabinet. The electric arc cannot spread inside the switch cabinet, so that the problem of phase-to-phase short circuit caused by arc ablation of the busbar is avoided, and the reliability and safety of the switch cabinet are improved.

Description

Technical Field

[0001] This invention belongs to the field of switchgear, and in particular relates to an anti-arc flash device and a switch cabinet. Background Technology

[0002] Low-voltage switchgear, as a crucial component of new energy photovoltaic power generation systems, mainly includes circuit breakers, load switches, grounding switches, main busbars, and branch busbars, playing a vital role in overload and short-circuit protection. Currently, the commonly used 800V switchgear on the market is an improvement on 400V or 690V switchgear by increasing the phase spacing. However, the short-circuit energy of the circuit breakers in 800V switchgear is relatively large, and the resulting large amount of electric arc entering the switchgear poses a significant safety hazard and can easily cause short circuits in the main busbar insulation, resulting in damage to the switchgear. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-arc flash device to solve the technical problem in the prior art where arcing caused by short circuits in circuit breakers easily damages the switchgear. Another purpose of this invention is to provide a switchgear to solve the same technical problem.

[0004] To achieve the above objectives, the technical solution of the anti-arc flash device provided by the present invention is as follows: An anti-arc flash device includes an arc extinguishing cover and an arc extinguishing structure. The arc extinguishing cover is used to be installed on a circuit breaker, and the arc extinguishing structure is used to be installed on the switch cabinet body. The arc extinguishing structure has an arc extinguishing channel inside, which allows the power supply arc to be discharged from one side of the switch cabinet, or the arc extinguishing structure is used to form an arc extinguishing channel with the switch cabinet body. The arc extinguishing cover is connected to the arc extinguishing structure to guide the arc generated by the circuit breaker to the arc extinguishing channel.

[0005] As a further improvement, a one-way arc guide valve is also provided between the arc extinguishing shroud and the arc exhaust structure. The one-way arc guide valve is directed from the arc extinguishing shroud to the arc exhaust channel.

[0006] As a further improvement, the one-way arc valve includes a valve body and a rotatable valve mounted on the valve body, the valve body having a flange for preventing the valve from rotating in the reverse direction.

[0007] As a further improvement, the anti-arc device is also equipped with a mesh structure located at the outlet of the arc discharge channel.

[0008] As a further improvement, the mesh structure is made of metal mesh.

[0009] This invention is a pioneering invention, and its beneficial effects are: the anti-arc device in this invention can guide and discharge the arc generated by the circuit breaker outside the switch cabinet. Specifically, the arc generated by the circuit breaker can first be cooled and dispersed by the arc extinguishing cover, and then enter the arc discharge channel and be discharged from the arc discharge channel, so as to avoid the arc spreading inside the switch cabinet and thus solve the problem of the switch cabinet being damaged by the arc generated by the circuit breaker.

[0010] To achieve the above objectives, the technical solution for the switchgear provided by this invention is as follows: A switch cabinet includes a switch cabinet body, inside which are installed multiple circuit breakers. Each circuit breaker is equipped with an arc-extinguishing cover. An arc-removing structure is installed on the switch cabinet body. The arc-removing structure has an arc-removing channel inside which the power supply arc is discharged from one side of the switch cabinet, or the arc-removing structure and the switch cabinet body enclose an arc-removing channel in which the power supply arc is discharged from one side of the switch cabinet. Each arc-extinguishing cover is connected to the arc-removing channel to guide the arc generated by the circuit breaker to the arc-removing channel.

[0011] As a further improvement, a one-way arc guide valve is also provided between the arc extinguishing shroud and the arc exhaust structure. The one-way arc guide valve is directed from the arc extinguishing shroud to the arc exhaust channel.

[0012] As a further improvement, the one-way arc valve includes a valve body and a rotatable valve mounted on the valve body, the valve body having a flange for preventing the valve from rotating in the reverse direction.

[0013] As a further improvement, the switchgear is also equipped with a mesh structure at the outlet of the arc discharge channel.

[0014] As a further improvement, the mesh structure is made of metal mesh.

[0015] This invention is an improved invention, and its beneficial effects are: the switch cabinet of this invention is equipped with an arc extinguishing cover and an arc venting structure for the circuit breaker, which can guide and discharge the electric arc generated by the circuit breaker outside the switch cabinet. Specifically, the electric arc generated by the circuit breaker can first be cooled and dispersed by the arc extinguishing cover, and then enter the arc venting channel and be discharged from the arc venting channel, so as to avoid the electric arc spreading inside the switch cabinet, thereby solving the problem of the switch cabinet being damaged by the electric arc generated by the circuit breaker. Attached Figure Description

[0016] Figure 1 This is a front view of an embodiment of the switch cabinet in this invention (with one cabinet door hidden). Figure 2 This is a top view (sectional view) of the switch cabinet embodiment of the present invention, taken from the unidirectional arc valve. Figure 3 This is a side view (partial perspective) of an embodiment of the switch cabinet in this invention. Figure 4 for Figure 2 A magnified view of a single-acting guide arc valve in the middle section; Figure 5 This is a partially enlarged view of the unidirectional arc valve in an embodiment of the switchgear of the present invention from another perspective; Figure 6 This is a schematic diagram of the arc discharge direction in an embodiment of the switchgear of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Arc-extinguishing structure; 2. Mounting bracket; 3. Arc-extinguishing hood; 4. One-way arc-guided valve; 5. Circuit breaker; 6. Metal mesh; 7. Insulating board; 401. Valve; 402. Rotary shaft; 403. Stop; 100. Switch cabinet body. Detailed Implementation

[0018] To enhance the arc protection capability of switchgear, the basic technical concept of this invention is to install an arc protection device on the switchgear that can guide the arc generated by the circuit breaker to be discharged outwards from the switchgear. In this way, the arc generated by the circuit breaker due to tripping or other faults will not spread inside the switchgear, thus solving the problem of arc damage to the switchgear.

[0019] Based on the above concept, the present invention will be further described in detail below with reference to embodiments.

[0020] Specific embodiments of the switchgear provided by this invention: The switchgear provided in this embodiment is as follows: Figures 1-3 As shown, the switchgear body 100 is basically consistent with the prior art, including a cabinet, main busbar, load switch, grounding switch, and circuit breakers 5. The circuit breakers 5 can be molded case circuit breakers, and four circuit breakers 5 are configured. Considering insulation requirements, the circuit breakers 5 are installed in corresponding positions via insulating plates 7. However, it should be noted that in different embodiments, depending on actual needs, the circuit breakers 5 can also be configured with three, five, or other quantities. The attached figures only exemplarily show one model of switchgear. The working principles of each part are consistent with the prior art and will not be described in detail here.

[0021] Unlike existing technologies, the switchgear provided in this embodiment is also equipped with an anti-arc flash device, such as... Figures 1-6As shown, the anti-flying arc device includes an arc-extinguishing cover 3 and an arc-dissipating structure 1. The arc-extinguishing cover 3 can be a conventional arc-extinguishing cover 3 in the prior art, that is, an arc-extinguishing cover 3 including a shell and multiple arc-extinguishing grids disposed in the shell. The arc-extinguishing cover 3 is installed one-to-one with the circuit breaker 5. That is to say, for the anti-flying arc device, when it is configured in the switchgear, the arc-extinguishing cover 3 is used to be installed on the circuit breaker 5. After the arc generated by the circuit breaker 5 enters the arc-extinguishing cover 3, it can be separated and cooled by the arc-extinguishing grids. The arc-dissipating structure 1 can be installed on the switchgear body 100, specifically by bolting the mounting bracket 2 onto the switchgear body 100. That is to say, for the anti-flying arc device, when it is configured in the switchgear, the arc-dissipating structure 1 is used to be installed on the switchgear body 100. The function of the arc-dissipating structure 1 is to guide the arc out of the switchgear body 100, specifically in the following two ways: Method 1: The arc-discharging structure 1 itself has an arc-discharging channel inside for the electric arc to be discharged from one side of the switch cabinet. That is, the arc-discharging structure 1 itself is a circumferentially enclosed tubular structure, which can be a square tube or a round tube, and there is no specific restriction here.

[0022] Method 2: The arc-discharging structure 1 itself is a non-enclosed structure, such as a U-shaped groove structure. When installed on the switch cabinet body 100, it forms an arc-discharging channel with the switch cabinet body 100, through which the power supply arc is discharged from one side of the switch cabinet.

[0023] Of course, an opening should be provided on the switch cabinet body 100 to allow the power arc to escape.

[0024] The arc-extinguishing chamber 3 is connected to the arc-extinguishing structure 1 to guide the arc generated by the circuit breaker 5 to the arc-extinguishing channel. In other words, each arc-extinguishing chamber 3 is connected to the arc-extinguishing channel, and the arc generated by the circuit breaker 5 can enter the arc-extinguishing channel.

[0025] During actual operation of the switchgear, arcs generated due to faults in circuit breaker 5 or other reasons can first be initially separated and cooled by the arc-extinguishing chamber 3 before entering the arc-discharging channel and being discharged from one side of the switchgear. This prevents the arc from spreading inside the switchgear, thus avoiding phase-to-phase short circuits caused by busbar erosion due to the arc, and improving the reliability and safety of the switchgear. In other words, no additional protection is needed for the busbar or other components, facilitating the normal operation of other components.

[0026] In a more preferred embodiment, such as Figure 1 As shown, a one-way arc guide valve 4 is also provided between the arc extinguishing chamber 3 and the arc extinguishing structure 1. As the name suggests, the one-way arc guide valve 4 refers to a valve that can only allow the arc to pass in one direction. Specifically, the guiding direction of the arc guide valve is from the arc extinguishing chamber 3 to the arc extinguishing channel. Figure 6As shown, the arc generated by a certain circuit breaker 5 can only enter the arc extinguishing channel in one direction, and will not flow from the arc extinguishing channel to other circuit breakers 5, thereby preventing the arc generated by the failure of a certain circuit breaker 5 from damaging other circuit breakers 5, and further improving the reliability of the switch cabinet.

[0027] As a preferred embodiment of the one-way arc valve 4, such as Figure 4 and Figure 5 As shown, the one-way arc-guided valve 4 includes a valve body on which a rotatable valve 401 is mounted. The valve body has a retaining flange 403 to prevent the valve 401 from rotating in the reverse direction (the conduction direction is forward). During normal use, the valve 401 rests on the retaining flange 403. If a circuit breaker 5 malfunctions and generates an arc, pressurized gas can cause the valve 401 to rotate, allowing it to conduct into the arc-extinguishing channel and thus expel the arc. This embodiment of the one-way arc-guided valve 4 has a simple structure and is easy to implement. However, it should be noted that other embodiments may also use other types of one-way arc-guided valves 4, such as a cone valve with an axially movable valve core.

[0028] Furthermore, it should be noted that in some other embodiments, for switchgear with lower voltage levels, the one-way arc guide valve 4 may not be installed. Even if an arc enters other circuit breakers 5 through the arc extinguishing channel, the circuit breaker 5 can still be kept basically stable under the basic protection of the arc extinguishing chamber 3 because the arc energy is not high.

[0029] In some preferred embodiments, the arc-extinguishing channel outlet is further equipped with a mesh structure. When the arc exits the arc-extinguishing channel, it can be separated and cooled again by the mesh structure to extinguish the arc, making the anti-flying arc device more suitable for switchgear with slightly higher voltage levels. Specifically, the mesh structure is preferably made of metal mesh 6, which has stronger high-temperature resistance and ablation resistance, and higher reliability. When arranging the metal mesh 6, it can be directly installed on the switchgear body 100. Of course, in other embodiments, it is also possible to install the metal mesh 6 at one end of the arc-extinguishing structure 1 located at the outlet.

[0030] Specific embodiments of the anti-flying arc device provided by the present invention: The embodiment of the anti-flying arc device is the anti-flying arc device described in the above-mentioned switch cabinet embodiment, and will not be described in detail here.

[0031] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-arc flash device, characterized in that, It includes an arc-extinguishing hood and an arc-discharging structure. The arc-extinguishing hood is used to install on the circuit breaker, and the arc-discharging structure is used to install on the switch cabinet body. The arc-discharging structure has an arc-discharging channel inside, which allows the power supply arc to be discharged from one side of the switch cabinet. Alternatively, when in use, the arc-discharging structure can be enclosed with the switch cabinet body to form an arc-discharging channel where the power supply arc is discharged from one side of the switch cabinet. The arc-extinguishing hood and the arc-discharging structure are connected to guide the arc generated by the circuit breaker to the arc-discharging channel.

2. The anti-arc flash device according to claim 1, characterized in that, A one-way arc guide valve is also provided between the arc extinguishing hood and the arc discharge structure. The one-way arc guide valve is directed from the arc extinguishing hood to the arc discharge channel.

3. The anti-arc flash device according to claim 2, characterized in that, A one-way arc valve includes a valve body and a rotatable valve mounted on the valve body. The valve body is provided with a flange to prevent the valve from rotating in the reverse direction.

4. The anti-arc flash device according to any one of claims 1-3, characterized in that, The anti-arc device is also equipped with a mesh structure at the outlet of the arc-extinguishing channel.

5. The anti-arc flash device according to claim 4, characterized in that, The mesh structure is made of metal mesh.

6. A switch cabinet, comprising a switch cabinet body, wherein a plurality of circuit breakers are disposed inside the switch cabinet body, characterized in that, Each circuit breaker is equipped with an arc-extinguishing cover, and the switch cabinet body is equipped with an arc-removing structure. The arc-removing structure has an arc-removing channel inside, which allows the power supply arc to be discharged from one side of the switch cabinet, or the arc-removing structure and the switch cabinet body enclose an arc-removing channel that allows the power supply arc to be discharged from one side of the switch cabinet. Each arc-extinguishing cover is connected to the arc-removing channel to guide the arc generated by the circuit breaker to the arc-removing channel.

7. The switchgear according to claim 6, characterized in that, A one-way arc guide valve is also provided between the arc extinguishing hood and the arc discharge structure. The one-way arc guide valve is directed from the arc extinguishing hood to the arc discharge channel.

8. The switchgear according to claim 7, characterized in that, A one-way arc valve includes a valve body and a rotatable valve mounted on the valve body. The valve body is provided with a flange to prevent the valve from rotating in the reverse direction.

9. The switchgear according to any one of claims 6-8, characterized in that, The switchgear is also equipped with a mesh structure at the outlet of the arc discharge channel.

10. The switchgear according to claim 9, characterized in that, The mesh structure is made of metal mesh.

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