CN112398038B - Prefabricated cabin pressure release system - Google Patents

Abstract

The invention relates to a prefabricated cabin pressure relief system, which is characterized in that through the design of a special arcing pressure relief channel, pressure and toxic gas are released to the outside of a prefabricated cabin through the channel and pressure relief ports arranged at two ends of the channel, so that the safety of equipment and personnel is ensured. According to the technical scheme provided by the invention, the problem that the prefabricated cabin has no arcing pressure relief channel is solved, the requirement that the pressure relief device can be completely opened when the switch cabinet in the prefabricated cabin has an arcing fault is met, the safe pressure relief of the prefabricated cabin can be realized without influencing the working operation environment in the prefabricated cabin and increasing the height of the conventional prefabricated cabin, and the requirement of domestic road transportation standard is met.

Description

A prefabricated cabin pressure relief system

technical field

The invention relates to the technical field related to electric equipment, in particular to a pressure relief system for a prefabricated cabin.

Background technique

The prefabricated cabin, also known as the prefabricated substation, is a kind of integrated equipment. After completing the production, assembly, wiring, commissioning and other work of the equipment in the factory, and transported to the project site as a whole, it is installed on the prefabricated foundation. superior. Since all equipment is integrated and set up to operate in a closed exclusive space, the temperature and humidity inside the prefabricated cabin are adjusted through the air-conditioning environment control system, so that the substation equipment is in the best protected state. Since the internal primary and secondary equipment realizes the complete set of equipment integrated by the manufacturer, factory processing, and secondary wiring completed on site, it greatly reduces the workload of design, construction, installation, commissioning and maintenance, simplifies maintenance work, and effectively shortens the construction period. . It is widely used in the construction of substations, and is gradually applied to the construction of energy storage power stations and new energy substations.

The internal arc fault of a switchgear is an inevitable and destructive fault. Although the probability of occurrence is very small, it cannot be avoided. Once it occurs, it will bring harm to personal safety and electrical equipment. Therefore, all primary switches The equipment is equipped with a pressure relief device, which is generally installed on the top of the cabinet.

For the prefabricated cabin integrating primary equipment, it is necessary to fully consider the pressure relief of the internal medium-voltage complete switchgear to ensure that the pressure relief device on the top of the switchgear can be fully opened, and the pressure relief device cannot touch the top of the prefabricated cabin to avoid damage to the substation itself. However, considering the height limit requirements of transportation, the height of the prefabricated cabin is fixed, which leads to the limited space height between the internal medium voltage switchgear and the top of the prefabricated cabin, so that the pressure relief device of the switchgear cannot be fully opened.

Since the prefabricated cabin itself is a closed space, it is necessary to set up necessary arcing channels inside the prefabricated cabin to release the pressure and toxic gases generated by arcing faults to the outside of the prefabricated cabin through the channels, avoiding direct discharge to the inside of the substation.

The existing technical solutions usually adopt arcing channels on the top of the switchgear, and there are several methods as follows:

Option 1. There is no special channel for pressure relief, and the medium voltage switchgear is directly placed inside the prefabricated cabin. The structure diagram of this option is shown in Figure 1.

Option 2: Set channels on each cabinet of the switchgear. The width of the channels is slightly smaller than the width of the switch cabinets. They are fixed on the switch cabinets by bolts. The channels are independent of each other and lead to the pressure relief ports on the rear wall of the substation behind the cabinets respectively. The structural diagram of the scheme is shown in Figure 2 and Figure 3.

Option 3: Set up channels on each cabinet of the switchgear. The channel is as wide as the switch cabinet and fixed on the switch cabinet by bolts. The channels are connected through bolts and lead to the cable trenches on both sides of the cabinet. As shown in Figure 4.

Yet, in the scheme of above-mentioned prior art, there is following defect:

Solution 1: At present, the prefabricated cabins of most manufacturers have no pressure relief channels. The defects of this scheme are as follows: (1) When the voltage level is high (35kV), the pressure relief device on the top of the switchgear cannot be fully opened, so there are potential safety hazards; (2) The pressure relief device on the top of the switchgear opens when an arcing fault occurs , the cover plate of the pressure relief device will touch the inner roof of the prefabricated cabin, causing damage to the inner roof of the prefabricated cabin, and at the same time, the internal high-pressure gas will directly impact the inner roof, causing damage; (3) The arcing fault pressure relief device of the switchgear is opened Finally, the pressure and the generated toxic gas and molten solid particles are directly released into the prefabricated cabin, which affects the personal safety of the internal personnel and causes damage to the adjacent cabinet and the interior of the substation.

Solution 2. The disadvantages of this solution are as follows: (1) There are limitations in the application occasion, and it is only suitable for 10kV switchgear with low voltage level and small size, because this kind of switchgear itself is not high, and there is enough space on the top to prevent combustion. The arc pressure relief channel is not very versatile; (2) For high voltage levels, the height of the prefabricated cabin needs to be raised as a whole, so that it cannot meet the minimum height limit required by domestic high-speed road transportation, and it will increase the cost. The realization of the design also increases the workload, and it is easy to cause water leakage and rust in the assembled parts, which affects the life and increases the maintenance workload; (3) because each cabinet needs to be installed on the rear wall of the prefabricated cabin. Pressure holes, thus affecting the sealing of the prefabricated cabin, resulting in easy water seepage and air leakage inside, affecting the thermal insulation performance, and more likely to generate condensation, affecting the internal equipment environment and safety.

Solution 3. The disadvantages of this solution are as follows: (1) There are limitations in the application occasions, and it is only suitable for 10kV switchgear with low voltage level and small size, because this type of switchgear itself is not high, and there is sufficient space on the top to prevent combustion. The arc pressure relief channel is not very versatile; (2) For high voltage levels, the height of the prefabricated cabin needs to be raised as a whole, so that it cannot meet the minimum height limit required by domestic high-speed road transportation, and it will increase the cost. The realization of the design also increases the workload, and it is easy to cause water leakage and rust in the assembly part, which affects the life and increases the maintenance workload; (3) The pressure relief channel is directly connected to the cable trench, which is affected by the humid environment of the cable trench. Condensation is more likely to occur inside the cover of the pressure relief channel. When the condensation phenomenon is serious, the condensation will condense into water droplets, which will easily cause flashover discharge when dripping on the switchgear, which will affect safety.

Contents of the invention

Based on the above situation of the prior art, in order to solve the problem of no arcing and pressure relief channels in the prefabricated cabin, and to meet the requirement that the pressure relief device can be fully opened when an arcing fault occurs in the switchgear inside the prefabricated cabin, the present invention provides a prefabricated cabin The pressure relief system, through the design of the special arcing pressure relief channel, releases the pressure and toxic gas to the outside of the prefabricated cabin through the channel and the pressure relief ports at both ends of the channel to ensure the safety of equipment and personnel. The technical solution provided by the invention can realize the safe pressure relief of the prefabricated cabin without affecting the working environment inside the prefabricated cabin and without increasing the height of the existing prefabricated cabin, and can meet the requirements of domestic road transportation.

In order to achieve the above purpose, the present invention provides a pressure relief system for a prefabricated cabin, the pressure relief system includes a prefabricated cabin 9, a switch cabinet 8 arranged inside the prefabricated cabin 9, a pressure relief system arranged inside the prefabricated cabin roof 1 pressure channel, and the first pressure relief device 11; wherein,

The upper part of the switch cabinet 8 is provided with a second pressure relief device 7;

The pressure relief channel includes: pressure relief channel cover body 2, pressure relief channel front cover 3, pressure relief channel rear cover 4, and end pressure relief channel bottom cover 10;

The pressure relief channel cover 2 is integrated inside the prefabricated cabin roof 1;

The first pressure relief device 11 is fixedly arranged on the side wall of the prefabricated cabin 9;

The cover body 2 of the pressure relief passage, the front cover 3 of the pressure relief passage, the rear cover 4 of the pressure relief passage and the upper top of the switch cabinet 8 form a closed passage.

Further, the front cover plate 3 of the pressure relief channel and the rear cover plate 4 of the pressure relief channel are provided separately.

Further, the lower edge of the cover body 2 of the pressure relief channel protrudes a certain distance from the inner top of the closed top cover, so as to fix the upper edges of the front cover plate 3 and the rear cover plate 4 of the pressure relief channel.

Further, the front cover plate 3 of the pressure relief channel and the rear cover plate 4 of the pressure relief channel are formed by directly extending from the lower edge of the cover body 2 of the pressure relief channel to the top of the switch cabinet 8 .

Further, the pressure relief channel also includes a front fixed angle steel 6 and a rear fixed angle steel 5, the front fixed angle steel 6 and the rear fixed angle steel 5 are used to fix the front cover plate 3 and the pressure relief channel respectively. Press channel rear cover 4.

Further, the cover body 2 of the pressure relief channel is U-shaped and formed by bending a metal plate.

Further, the pressure relief channel cover 2 is formed by welding or splicing three metal plates.

Further, the pressure relief channel cover 2 covers all the second pressure relief devices 7 above the switch cabinet 8 .

Further, the bottom cover 10 of the end pressure relief channel is U-shaped, and the upper part is connected to the protruding part of the lower edge of the cover body 2 of the pressure relief channel.

Further, the bottom cover 10 of the end pressure relief channel is formed by bending one steel plate, or welding or splicing three metal plates.

To sum up, the present invention provides a prefabricated cabin pressure relief system, through the design of a special arc burning pressure relief channel, the pressure and toxic gas are released to the outside of the prefabricated cabin through the channel and the pressure relief ports provided at both ends of the channel, Ensure the safety of equipment and personnel. The technical solution provided by the invention solves the problem of no arcing and pressure relief channels in the prefabricated cabin, and meets the requirement that the pressure relief device can be fully opened when an arcing fault occurs in the switchgear inside the prefabricated cabin, without affecting the interior of the prefabricated cabin. In the working and operating environment, without increasing the height of the existing prefabricated cabin, it can realize the safe pressure relief of the prefabricated cabin and meet the requirements of domestic road transportation.

Description of drawings

Fig. 1 is a schematic structural view of a prefabricated cabin not provided with a pressure relief passage in the prior art solution;

Fig. 2 is a structural schematic diagram 1 of a prefabricated cabin provided with a pressure relief channel on each switch cabinet body of the prior art scheme two;

Fig. 3 is a structural schematic diagram 2 of a prefabricated cabin with a pressure relief channel arranged on each switchgear cabinet of the second prior art solution;

Fig. 4 is a structural schematic diagram of a prefabricated cabin provided with a pressure relief channel on each switchgear cabinet of the prior art scheme three;

Fig. 5 is a schematic diagram of the planar structure of the prefabricated cabin pressure relief system of the present invention;

Fig. 6 is a schematic diagram of the three-dimensional structure of the prefabricated cabin pressure relief system of the present invention;

Fig. 7 is a schematic structural view of the bottom cover of the pressure relief channel at the end of the prefabricated cabin pressure relief system of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

The technical solution of the present invention will be described in detail below. According to an embodiment of the present invention, a prefabricated cabin pressure relief system is provided. FIG. 5 shows a schematic plan view of the prefabricated cabin pressure relief system of the present invention. FIG. 6 shows The three-dimensional structural schematic diagram of the prefabricated cabin pressure relief system of the present invention, combined with Fig. 5 and Fig. 6, it can be known that the prefabricated cabin pressure relief system provided in this embodiment includes a prefabricated cabin 9, a switch cabinet 8 arranged inside the prefabricated cabin 9, a device The pressure relief channel inside the prefabricated cabin roof 1 and the first pressure relief device 11 . The prefabricated cabin 9 may also be called a prefabricated substation, or a prefabricated cabin-type combined device. The prefabricated cabin roof 1 is an important part that provides support and protection on the top of the prefabricated cabin 9. It needs to be able to withstand a certain static load, and the interior is provided with an insulation layer. On the inner roof of the prefabricated cabin roof 1, lighting and smoke detectors can be installed. Prefabricated cabin auxiliary equipment. The switchgear 8, usually a medium-voltage switchgear, is placed inside the prefabricated cabin 9, and it is necessary to reserve sufficient maintenance space in front of and behind the switchgear 8 during installation. The first pressure relief device 11 is a pressure relief device arranged at the end, the top of the pressure relief device is fixed on the steel plate of the side wall of the prefabricated cabin 9 by metal bolts or metal hinges, and the bottom is fixed on the side wall of the prefabricated cabin 9 by nylon screws on the steel plate. The upper part of the switch cabinet 8 is provided with a second pressure relief device 7. When an arcing fault occurs inside, the second pressure relief device 7 is opened to release the pressure inside the switch cabinet 8 and prevent the switch cabinet 8 from exploding. Causing personal injury or related equipment damage, the second pressure relief device 7 belongs to the pressure relief device that comes with the switchgear.

The pressure relief channel includes: a pressure relief channel cover body 2 , a pressure relief channel front cover 3 , a pressure relief channel rear cover 4 , and an end pressure relief channel bottom cover 10 .

The pressure relief passage cover 2 is the pressure relief passage cover 2 integrated inside the prefabricated cabin roof 1 on the prefabricated cabin 9 . The pressure relief passage cover 2 can be a U-shaped cover, which is bent from a whole metal plate with a thickness greater than 2 mm, or can be welded by three metal plates with a thickness greater than 2 mm, or three metal plates with a thickness of more than 2 mm can be used. The metal plates larger than 2mm are spliced together, and the splices are fixed with bolts. The pressure relief channel cover 2 and the upper and lower parts of the prefabricated cabin roof 1 are fixedly connected by welding or bolts; the lower edge of the pressure relief channel cover 2 protrudes a certain distance from the inner top of the prefabricated cabin roof, and is used for the pressure relief channel The fixing of the upper edge of the front cover plate 3 and the rear cover plate 4 of the pressure relief channel. The pressure relief channel cover 2 can also directly extend to the top of the switch cabinet 8 . The pressure relief channel cover body 2 can cover all the pressure relief devices above the switch cabinet 8 to its interior.

The front cover plate 3 of the pressure relief channel and the rear cover plate 4 of the pressure relief channel can be set separately, and the upper part is fixedly connected by bolts and the protruding part of the lower edge of the cover body 2 of the pressure relief channel on the prefabricated cabin roof 1 by bolts, and the thickness is greater than 2mm; It can also be formed by directly extending the lower edge of the pressure relief passage cover 2 integrated in the prefabricated cabin roof 1 to the top of the switch cabinet 8 .

The bottom cover 10 of the end pressure relief channel is formed by integral bending of a steel plate with a thickness greater than 2 mm, or welded or spliced by three metal plates with a thickness greater than 2 mm. The upper pressure relief channel cover body 2 is connected to the lower part along the protruding part; the design of the bottom cover 10 of the pressure relief channel at the end can make the first pressure relief device 11 be arranged on the side wall of the prefabricated cabin 9 instead of being arranged on the prefabricated The side of the cabin roof 1, thereby affecting the function of the air vents and waterproof edges around the prefabricated cabin roof 1.

The pressure relief passage also includes a front fixed angle steel 6 and a rear fixed angle steel 5, which are respectively used to fix the front cover plate 3 of the pressure relief passage and the back cover of the pressure relief passage plate 4. The fixed angle steel 6 at the front and the fixed angle steel 5 at the rear, the specification adopts the angle steel above 3#, and the angle steel is also fixed on the upper top plate of the switch cabinet 8 by bolts.

Through the pressure relief passage cover 2 integrated in the prefabricated cabin 9, the pressure relief passage front cover 3, the pressure relief passage rear cover 4, and the upper top of the switch cabinet 8 form a closed passage, and the top of the passage is 8 away from the switch cabinet. The height of the top is greater than 500 mm, which can ensure that the second pressure relief device 7 on the top of the switch cabinet 8 is fully opened.

Due to the design of integrating the pressure relief channel inside the roof 1 of the prefabricated cabin, the overall height of the prefabricated cabin 9 is lower than 3400mm, which meets the requirements for overall transportation; the number of switch cabinets 8 inside the prefabricated cabin 9 is at least one side, and multi-sided layout The top channel of the switch cabinet 8 is connected, and the pressure relief channel leads to the two ends of the prefabricated cabin 9 along the direction of the switch cabinet 8 arrangement, and the end pressure relief channel bottom cover 10 and the pressure relief channel cover body 2 integrated on the top are provided at both ends. Connected by bolts, a first pressure relief device 11 is provided on the side wall of the prefabricated cabin 9 . In this way, when an arcing fault occurs inside the switchgear 8, the pressure relief channel at the top of the switchgear 8 can be fully opened to release the internal pressure. The released pressure and toxic gas are discharged to the pressure relief device holes at both ends of the prefabricated cabin through this closed pressure relief channel. Since the pressure relief hole is opened and connected to the outside of the prefabricated cabin 9, the pressure and toxic gas are discharged through the pressure relief hole. To the outside of the prefabricated cabin.

To sum up, the present invention relates to a prefabricated cabin pressure relief system with a built-in pressure relief arcing channel, which can realize the leakage of arcing pressure. In the present invention, the pressure relief channel is arranged above the switchgear, and the width completely covers all the pressure relief devices above the switchgear. The pressure relief device is connected to the outside world; the top plate of the internal pressure relief channel of the top cover is built in the top cover; the lower U-shaped arcing pressure relief bottom cover at the ends of the pressure relief channel of the prefabricated cabin is set to form the two ports through the cover. The closed passage is connected with other passages, and the position of the pressure relief device at both ends of the arcing passage can be moved down, so as to avoid affecting the vents and waterproofing on the outer edge of the prefabricated cabin roof. Through the above design, the problem of no special pressure relief channel in the prefabricated cabin in the prior art is solved, and the problem of height increase brought by the built-in pressure relief channel to the prefabricated cabin is solved, so that the height of the prefabricated cabin product will not be affected by the setting of the arcing channel And increase, so as to meet the height limit requirements of road transportation. It has strong versatility and is suitable for all switch cabinets with top pressure relief. Through the above design, only a few pressure relief device holes need to be set on the prefabricated cabin, avoiding the problem of opening holes on the rear wall of the prefabricated cabin behind each cabinet when the pressure relief device is independently installed for each switchgear, and increasing the sealing of the prefabricated cabin performance, reducing the probability of water leakage; higher integration, faster and more convenient installation, compared with other pressure relief and arcing channels, due to the integration of the top, it also reduces the workload of installing a separate cover.

It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principle of the present invention, and not to limit the present invention. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention shall fall within the protection scope of the present invention. Furthermore, it is intended that the appended claims of the present invention embrace all changes and modifications that come within the scope and metesques of the appended claims, or equivalents of such scope and metes and bounds.

Claims (6)

1. a prefabricated cabin decompression system, is characterized in that, described pressure relief system comprises prefabricated cabin (9), is arranged on the switchgear (8) inside described prefabricated cabin (9), is arranged on prefabricated cabin roof ( 1) the internal pressure relief channel and the first pressure relief device (11); wherein, The upper part of the switch cabinet (8) is provided with a second pressure relief device (7); The pressure relief passage includes: a pressure relief passage cover (2), a pressure relief passage front cover (3), a pressure relief passage rear cover (4) and an end pressure relief passage bottom cover (10). The pressure channel front cover (3) and the pressure relief channel rear cover (4) are formed by directly extending the lower edge of the pressure relief channel cover (2) to the top of the switch cabinet (8); The bottom cover (10) of the pressure relief channel is U-shaped, and the upper part is connected with the protruding part of the lower edge of the cover body (2) of the pressure relief channel; The pressure relief passage also includes a front fixed angle steel (6) and a rear fixed angle steel (5), and the front fixed angle steel (6) and the rear fixed angle steel (5) are respectively used to fix the front of the pressure relief passage. Cover plate (3) and pressure relief passage rear cover plate (4); The pressure relief passage cover (2) is integrally arranged inside the prefabricated cabin roof (1), and the lower edge of the pressure relief passage cover (2) protrudes a certain distance from the inner top of the top cover to fix The upper edge of the pressure relief passage front cover (3) and the pressure relief passage rear cover (4); The first pressure relief device (11) is fixedly arranged on the side wall of the prefabricated cabin (9); The cover body (2) of the pressure relief passage, the front cover (3) of the pressure relief passage, the rear cover (4) of the pressure relief passage and the upper top of the switch cabinet (8) form a closed passage. 2. The pressure relief system according to claim 1, characterized in that, the front cover plate (3) of the pressure relief channel and the rear cover plate (4) of the pressure relief channel are provided separately. 3. The pressure relief system according to claim 2, characterized in that, the cover body (2) of the pressure relief channel is U-shaped and formed by bending a metal plate. 4. The pressure relief system according to claim 2, characterized in that, the pressure relief channel cover (2) is formed by welding or splicing three metal plates. 5. The pressure relief system according to claim 3 or 4, characterized in that, the pressure relief channel cover (2) covers all the second pressure relief devices (7) above the switchgear (8). 6. The pressure relief system according to claim 5, characterized in that, the bottom cover (10) of the end pressure relief channel is formed by bending one steel plate, or is formed by welding or splicing three metal plates.

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