CN110707584A - Switch cabinet internal short circuit arcing pressure relief channel and pressure relief method - Google Patents
Switch cabinet internal short circuit arcing pressure relief channel and pressure relief method Download PDFInfo
- Publication number
- CN110707584A CN110707584A CN201910968780.1A CN201910968780A CN110707584A CN 110707584 A CN110707584 A CN 110707584A CN 201910968780 A CN201910968780 A CN 201910968780A CN 110707584 A CN110707584 A CN 110707584A
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- pressure relief
- switch cabinet
- channel
- short circuit
- compartment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Patch Boards (AREA)
Abstract
A short circuit arcing pressure relief channel and a pressure relief method in a switch cabinet comprise a pressure relief cover and a buffer chamber, wherein the pressure relief cover and the buffer chamber are installed at the top of a compartment of the switch cabinet, the buffer chamber is connected with a directional arcing channel, and the directional arcing channel penetrates through a wall body and extends to the outside of the wall body to be connected with an extending part. By adopting the pressure relief channel, when short-circuit explosion accidents occur inside the switch cabinet compartment, the pressure relief cover at the top of the switch cabinet compartment is opened under the action of overpressure, high-temperature and high-pressure gas is discharged from the switch cabinet compartment into the buffer chamber and is discharged to the external environment through the directional arc striking channel and the extension part, so that the directional flow of the short-circuit explosion high-pressure and high-temperature gas is realized, and the influence on the cabinet body and surrounding equipment is reduced. After the hinge mode is adopted, the deformation of the surface of the pressure relief cover is small, the reuse rate of the pressure relief cover can be improved, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of safety protection of switch cabinets, in particular to an internal short circuit arcing pressure relief channel and a pressure relief method for a switch cabinet.
Background
At present, the suppression measure aiming at the pressure rise of the internal short circuit arcing explosion is mainly researched by a small-size closed container, and the proposed measures mainly comprise ① that a metal grid absorber is additionally arranged, the influence of the short circuit explosion on the outside of a compartment is reduced by the absorption of heat and the blocking effect of airflow through the metal grid, ② that an easily-melted metal electrode is adopted, and part of energy released by short circuit is consumed by the melting heat absorption of metal in the arcing process, so that the pressure effect is reduced, and ③ that a buffer chamber is additionally arranged at the top of the container, so that high-temperature and high-pressure gas released by the arcing chamber quickly enters the buffer chamber, and the influence of the short circuit explosion on the equipment and the building is reduced.
The suppression effect of the measures is only verified in the simple closed container, and application research aiming at the actual switch cabinet is less. Meanwhile, the current design of the pressure relief channel of the switch cabinet is mainly experience and lacks of system research.
Although the existing pressure relief channel can effectively release pressure, part of the pressure relief cover is opened in a folding and overturning mode, and overturning resistance to be overcome is large. Meanwhile, the pressure relief cover is exposed in a complex environment for a long time, such as dirt, moisture and the like, and the fixing bolt is easy to corrode and block, so that the opening pressure of the pressure relief cover is increased, and finally the pressure relief cover of the switch cabinet which runs for a long time is likely to have fault conditions of opening rejection, delayed opening, small turnover angle and the like. Once the pressure relief cover can not be opened normally in time to release pressure, a serious safety accident that the cabinet door is opened will occur, thereby causing great threat to surrounding workers. In addition, after the pressure relief cover is opened, high-temperature and high-pressure gas and red-hot particulate matters released from the pressure relief opening are directly discharged to the periphery of the cabinet body without effective guidance, so that surrounding equipment is easily affected, secondary accidents are caused, and even major safety accidents of fire burning and continuous operation occur. Therefore, the existing switch cabinet pressure relief channel has more defects and needs to be improved.
Disclosure of Invention
The invention provides a switch cabinet internal short circuit arcing pressure relief channel and a pressure relief method.A pressure relief channel is arranged above the top of a switch cabinet compartment, so that on one hand, the opening force of a pressure relief cover can be reduced, and the opening time of the pressure relief cover is shortened; on the other hand, the directional circulation of high-pressure and high-temperature airflow in the cabinet body can be realized, so that the influence of the high-temperature airflow on peripheral equipment is reduced, and the threat of short-circuit explosion impact force on buildings is reduced.
The technical scheme adopted by the invention is as follows:
the utility model provides an inside short circuit arcing pressure release passageway of cubical switchboard, is including installing pressure release lid, the surge chamber at cubical switchboard compartment top, directional striking channel is connected to the surge chamber, and directional striking channel passes the wall body and extends to the wall body outside and the extension part links to each other.
The probability that workers touch the front cabinet door and the side face of the cabinet body is high, and the high-temperature gas escaping from the arc striking channel is prevented from injuring surrounding workers. The directional arc striking channel extends to the outside of the wall body from one side of the rear cabinet door of the switch cabinet. Meanwhile, in order to prevent the sprayed high-temperature and high-pressure airflow from damaging the periphery of the environment, the outlet of the extension part adopts an arc angle to transit towards the right upper part.
The switch cabinet compartment and the buffer chamber, and the directional arc striking channel and the extension part are fixed through high-strength bolts, so that reliable connection between the pressure relief channel and the switch cabinet body is guaranteed, and the switch cabinet compartment and the buffer chamber are convenient to disassemble. Rain-proof caps are arranged at the tops of the extension parts to prevent moisture from entering the cabinet body, and metal grids with smaller sizes are arranged at the bottoms of the extension parts to collect rainwater, dirt and other sundries.
The pressure relief cover is a cover with a hinge, one side of the pressure relief cover is fixed through a metal bolt, and the other side of the pressure relief cover is fixed through a nylon bolt with smaller strength, so that the pressure relief cover can be opened quickly and reliably; the hinge is close to one side of the metal bolt.
The size of the bottom surface of the buffer chamber is smaller than or equal to the size of the top of the switch cabinet compartment; the cross-sectional area of the directional arc ignition channel is smaller than the area of the side surface of the buffer chamber.
When short circuit explosion accidents occur inside a compartment of a switch cabinet, a pressure relief cover at the top of the compartment of the switch cabinet is opened under the action of overpressure, high-temperature and high-pressure gas is discharged from the compartment of the switch cabinet into a buffer chamber and is discharged to the external environment through a directional arc striking channel and an extension part, so that the directional flow of the high-pressure and high-temperature gas generated by short circuit explosion is realized, and the influence on a cabinet body and surrounding equipment is reduced.
When short circuit explosion accidents occur in the switch cabinet compartment, the nylon bolt is firstly broken when the pressure relief cover is under the action of overpressure, the pressure relief cover is opened to release pressure, and the metal bolt has high strength, so that the opening process of the pressure relief cover can be reliably connected with the top of the switch cabinet compartment.
The invention discloses a switch cabinet internal short circuit arcing pressure relief channel and a pressure relief method, which have the following technical effects:
1. the pressure relief channel is arranged above the top of the compartment of the switch cabinet, so that on one hand, the opening force of the pressure relief cover can be reduced, and the opening time of the pressure relief cover is shortened; on the other hand, the directional circulation of high-pressure and high-temperature airflow in the cabinet body can be realized, so that the influence of the high-temperature airflow on peripheral equipment is reduced, and the threat of short-circuit explosion impact force on buildings is reduced.
2. After the folding part of the pressure relief cover is changed into the hinge, the resistance generated in the overturning process is greatly reduced, the time for completely opening the pressure relief cover can be reduced by about 35 percent compared with the original mode, and the reliability and the rapidity of the action of the pressure relief cover are improved; the degree of buckling of the pressure relief cover surface is also significantly improved. After the primary arcing explosion occurs, the surface of the original folding pressure relief cover can be greatly bent and deformed and can not be reused basically, and after the hinge mode is adopted, the deformation of the surface of the pressure relief cover is small, the reuse rate of the pressure relief cover can be improved, and the cost is saved.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural diagram of the directional arc ignition channel of the present invention.
Fig. 3 is a schematic view of a pressure relief cover according to the present invention.
Detailed Description
As shown in fig. 1 ~ and fig. 3, the improved pressure relief channel of the switch cabinet is composed of a pressure relief cover B, a buffer chamber C, a directional arc striking channel D, an extension portion E and a rain hat F, and is made of iron, and the specific structure is shown in fig. 2.
The top of the switch cabinet compartment A is provided with a rectangular pressure relief cover B and a buffer chamber C connected with the switch cabinet compartment A, and the size of the bottom surface of the buffer chamber C is smaller than or equal to that of the top of the switch cabinet compartment A; one side of the buffer chamber C close to the rear cabinet door of the switch cabinet is connected with a communicated directional arc striking channel D, and the sectional area of the directional arc striking channel D is smaller than the area of the side surface of the buffer chamber C. The directional arc striking channel D extends to the wall G and is connected with the extension part E through the wall G, and the extension part E adopts an arc angle to transit towards the right upper side so as to reduce the resistance of the extension part E to airflow; because the cubical switchboard need possess certain antifouling waterproof grade, consequently, need install rain-proof cap F directly over extension part E to prevent that outside environment rainwater etc. from passing through pressure release channel and getting into inside cubical switchboard compartment A, simultaneously, at extension part E bottom installation size less metal mesh 4 for collect debris such as rainwater, filth.
The switch cabinet compartment A and the buffer chamber C, and the buffer chamber C and the directional arc striking channel D are fixed by high-strength bolts, so that the switch cabinet compartment A and the buffer chamber C are convenient to mount and dismount; the directional arc striking channel D, the extension part E and the wall body G are fixed by high-strength bolts; the extension part E and the rain hat F are connected through four iron support bars 5 in a welding mode, and the vertical distance between the lower edge of the rain hat F and the outlet of the extension part E is 0.2 or 0.3 m.
The working principle of the pressure relief channel is as follows: when short circuit explosion accident happens inside the switch cabinet compartment A, the pressure relief cover B at the top of the switch cabinet compartment A is opened under the action of overpressure, high-temperature and high-pressure gas is discharged from the switch cabinet compartment A into the buffer chamber C and is discharged to the external environment through the directional arc striking channel D and the extension part E, and the gas flow direction is shown by arrows in figures 2 and 3. Therefore, the directional flow of the short-circuit explosion high-pressure high-temperature gas is realized, and the influence on the cabinet body and surrounding equipment is reduced.
In order to improve the opening reliability of the pressure relief cover B, the folding turnover type pressure relief cover is changed into a hinge type, as shown in fig. 3. One side of the pressure relief cover B is fixed by the metal bolt 2, the other side of the pressure relief cover B is fixed by the nylon bolt 3, the breaking strength of the nylon bolt 3 is far lower than that of the metal bolt, and the hinge 1 is close to one side of the metal bolt 2. When short circuit explosion accidents happen in the switch cabinet compartment A, the nylon bolt 3 is firstly broken under the action of overpressure of the pressure relief cover B, the pressure relief cover B is opened to release pressure, and the metal bolt 2 has high strength, so that the opening process of the pressure relief cover B can be reliably connected with the top of the switch cabinet compartment A.
Former foldable pressure release lid B is in the upset in-process, need overcome the resistance that the steel sheet is folded and is brought, and the resistance can increase along with the increase of rotation angle, and the pressure that the pressure release lid is pressed can reduce gradually along with the increase of rotation angle to the speed of pressure release lid B can descend gradually at the upset later stage, makes pressure release lid B open (more than 90) required time completely longer, appears opening the less condition of angle even. After the folding part of the pressure relief cover B is changed into the hinge 1, the resistance generated in the turning process is greatly reduced, and the pressure relief cover B can be ensured to be completely opened.
It should be noted that the pressure relief cover B of the present invention is not limited to a rectangular pressure relief opening, and may have any area, as long as the pressure relief requirement is satisfied.
In addition, the height of the buffer chamber C can be adjusted as required, but should be greater than the turning height of the pressure relief cover B.
In addition, the directional arc striking channel D is not limited to a rectangular cross section, and only the cross section area meets the pressure relief requirement.
Claims (10)
1. The utility model provides an inside short circuit arcing pressure release passageway of cubical switchboard, is including installing pressure release lid (B), surge chamber (C) at cubical switchboard compartment (A) top, its characterized in that: the buffer chamber (C) is connected with the directional arc striking channel (D), and the directional arc striking channel (D) penetrates through the wall body (G) to extend to the outside of the wall body (G) to be connected with the extension part (E).
2. The switch cabinet internal short circuit arcing pressure relief channel of claim 1, wherein: the directional arc striking channel (D) extends to the outside of the wall body (G) from one side of a rear cabinet door of the switch cabinet.
3. The switch cabinet internal short circuit arcing pressure relief channel of claim 1, wherein: and the outlet of the extension part (E) is in arc angle transition towards the right upper side.
4. The switch cabinet internal short circuit arcing pressure relief channel of claim 1, wherein: and the switch cabinet compartment (A) and the buffer chamber (C) and the directional arc striking channel (D) and the extension part (E) are fixed by high-strength bolts.
5. The switch cabinet internal short circuit arcing pressure relief channel of claim 1, wherein: rain-proof cap (F) is equipped with at extension part (E) top, and metal mesh (4) are installed to extension part (E) bottom.
6. The switch cabinet internal short circuit arcing pressure relief channel of claim 1, wherein: the pressure relief cover (B) is a cover with a hinge (1), one side of the pressure relief cover (B) is fixed through a metal bolt (2), the other side of the pressure relief cover (B) is fixed through a nylon bolt (3), and the hinge (1) is close to one side of the metal bolt (2).
7. The switch cabinet internal short circuit arcing pressure relief channel of claim 1, wherein: the size of the bottom surface of the buffer chamber (C) is smaller than or equal to the size of the top of the switch cabinet isolation chamber (A); the cross-sectional area of the directional arc striking channel (D) is smaller than the area of the side surface of the buffer chamber (C).
8. The switch cabinet internal short circuit arcing pressure relief channel of claim 5, wherein: the extension part E is connected with the rain-proof cap (F) through an iron support bar (5) in a welding mode.
9. A method for arcing and pressure relief of internal short circuit of switch cabinet is characterized by comprising the following steps: when short-circuit explosion accidents happen inside the switch cabinet compartment (A), the pressure relief cover (B) at the top of the switch cabinet compartment (A) is opened under the action of overpressure, high-temperature and high-pressure gas is discharged from the switch cabinet compartment (A) to enter the buffer chamber (C) and is discharged to the external environment through the directional arc striking channel (D) and the extension part (E), so that the directional flow of the short-circuit explosion high-pressure and high-temperature gas is realized, and the influence on the cabinet body and surrounding equipment is reduced.
10. A method for arcing and pressure relief of internal short circuit of switch cabinet is characterized by comprising the following steps: when short-circuit explosion accidents happen in the switch cabinet compartment (A), the pressure relief cover (B) breaks under the action of overpressure, the nylon bolt (3) breaks at first, the pressure relief cover (B) is opened to release pressure, and the metal bolt (2) is high in strength and can ensure that the opening process of the pressure relief cover (B) is reliably connected with the top of the switch cabinet compartment (A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968780.1A CN110707584A (en) | 2019-10-12 | 2019-10-12 | Switch cabinet internal short circuit arcing pressure relief channel and pressure relief method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968780.1A CN110707584A (en) | 2019-10-12 | 2019-10-12 | Switch cabinet internal short circuit arcing pressure relief channel and pressure relief method |
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| Publication Number | Publication Date |
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| CN110707584A true CN110707584A (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910968780.1A Pending CN110707584A (en) | 2019-10-12 | 2019-10-12 | Switch cabinet internal short circuit arcing pressure relief channel and pressure relief method |
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| CN (1) | CN110707584A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115347487A (en) * | 2021-05-12 | 2022-11-15 | 西门子能源国际公司 | Combined type underframe flue, medium-pressure equipment and high-pressure equipment |
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| CN205227356U (en) * | 2015-12-17 | 2016-05-11 | 浙江工商职业技术学院 | Rain -proof wood stove chimney pipe |
| CN106329340A (en) * | 2016-09-28 | 2017-01-11 | 江苏天港箱柜有限公司 | Arc resistant high voltage switchgear |
| CN106898954A (en) * | 2017-04-24 | 2017-06-27 | 武汉大学 | A kind of pressure relief device of switch cabinet |
| CN207963522U (en) * | 2018-03-21 | 2018-10-12 | 广州市新陶机械制造有限公司 | Residual heat from kiln furnace automatic decompression device |
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2019
- 2019-10-12 CN CN201910968780.1A patent/CN110707584A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893301A (en) * | 2010-07-12 | 2010-11-24 | 孟翔鸣 | Heat removal and temperature control energy-saving system for mobile communication base station |
| CN202282556U (en) * | 2011-10-28 | 2012-06-20 | 重庆博森电气集团开关有限公司 | Pressure-relief dust-proof device for switch cabinet |
| CN203103827U (en) * | 2012-12-27 | 2013-07-31 | 正泰电气股份有限公司 | Pressure release channel of middle-voltage switchgear |
| CN203367828U (en) * | 2013-07-17 | 2013-12-25 | 江苏大全箱变科技有限公司 | Box-type electric substation with concentrated pressure releasing channel |
| CN205227356U (en) * | 2015-12-17 | 2016-05-11 | 浙江工商职业技术学院 | Rain -proof wood stove chimney pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115347487A (en) * | 2021-05-12 | 2022-11-15 | 西门子能源国际公司 | Combined type underframe flue, medium-pressure equipment and high-pressure equipment |
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Application publication date: 20200117 |
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