Ring main unit
By adopting a double-layer arc-induced structure and pressure relief channel in the ring network cabinet, the problem of high-temperature and high-pressure airflow ejection during arc failure is solved, and simple and efficient arc guidance and pressure release are achieved, which improves equipment safety and cost-effectiveness. .
Patent Information
- Application Number
- CN202310731124.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-07
- Publication Date
- 2024-12-10
AI Technical Summary
When an arc failure occurs in the existing ring grid cabinet, the single plate structure cannot be effectively protected, resulting in high-temperature and high-pressure airflow ejection, which may cause fire or casualties. The traditional structure is complex, many parts and high costs, making it difficult to meet the guiding needs of arc faults. .
A ring net cabinet with an anti-fire arc structure is designed, adopting a double-layer arc-induced structure and pressure relief passage, including a stepped arrangement of top and side reinforcement plates and arc-induced plates, and a movable pressure relief plate for Guide and discharge the airflow and heat generated by the arc to form a simple and efficient pressure relief system.
Effectively guide the arc generated by the cable cone arc, reasonably arrange the pressure relief channels, quickly release pressure, reduce fire risks, simplify the structure, reduce costs, and improve the safety of the equipment.
Smart Images
Figure CN119108923A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a ring main unit, and in particular to a ring main unit with an arc-proof structure. Background Art
[0002] At present, whether it is air-insulated switchgear or gas-insulated switchgear, they all have a common compartment, the cable room. The cable room is one of the important parts of the switchgear design. It is the key part for introducing and extracting power. A sturdy cable room can effectively improve the safety of the switchgear. At present, most manufacturers' cable rooms are single-board structures, which can indeed play a certain supporting and protective role during normal operation. However, when a fault arc occurs in the equipment, high temperature and high pressure will be generated. The cable room with a single-board structure cannot play a protective role. The fault arc will burn through the side panel of the cable room, causing high-temperature and high-pressure airflow to spray out from the cable room, causing great harm to surrounding equipment and personnel, and serious fires or casualties.
[0003] For ring main unit products, to verify whether the arcing performance of the cable room meets the requirements, an arcing test is usually performed in a test station to verify. The conventional method used in the test station is to connect the copper busbar to the bottom of the cable room at the outlet cable cone, and short-circuit it as close to the pressure relief port at the bottom of the cable room as possible, so as to direct the air pressure and heat of the arcing to the pressure relief port as much as possible, and then discharge it through the pressure relief channel.
[0004] At present, the test standards and the State Grid random inspection (A inspection) require arcing in the cable room as a mandatory item, and it is required to short-circuit at the cable cone head. Since the cable cone is required to be greater than 650mm in height, if the arcing test is performed at a cabinet height of 650mm, the gas that expands rapidly during the arcing will be directed toward the front of the cabinet, and the most seriously affected areas are the area around the cable cone and the front door panel area. In order to ensure that there is no impact on the outside of the cabinet when an arc fault occurs, the traditional structure is complex, with many parts and high cost. Therefore, it is necessary to develop a structure with simple structure, reliable performance, low cost, and arc guidance to meet the needs of arc faults. Summary of the invention
[0005] In view of the above-mentioned deficiencies in the prior art, the present invention proposes a new ring main unit.
[0006] A first aspect of the present invention provides a ring main unit with an arc-proof structure, comprising: a cable chamber for accommodating at least one cable cone; and a pressure relief chamber connected to the cable chamber, for discharging the airflow and / or heat generated by the arc to the outside of the ring main unit when an arc occurs at the at least one cable cone, wherein a double-layer arc-starting structure is provided on the top plate and the left and right side plates of the cable chamber.
[0007] In the ring network cabinet provided by the second aspect of the present invention, a top reinforcing plate is installed on the side of the top plate facing the interior of the cable room, and a top arc-starting plate is installed on the side of the top reinforcing plate facing the interior of the cable room, and the top arc-starting plate and the top reinforcing plate overlap with each other to form a double-layer structure.
[0008] In the ring network cabinet provided by the third aspect of the present invention, a left reinforcing plate is installed on the side of the left side plate facing the inside of the cable room, a left arc-starting plate is installed on the side of the left reinforcing plate facing the inside of the cable room, the left reinforcing plate and the left arc-starting plate are arranged at a certain distance front and back to form a step shape, a right reinforcing plate is installed on the side of the right side plate facing the inside of the cable room, a right arc-starting plate is installed on the side of the right reinforcing plate facing the inside of the cable room, the right reinforcing plate and the right arc-starting plate are arranged at a certain distance front and back to form a step shape.
[0009] In the ring main unit provided in the fourth aspect of the present invention, in addition to playing a reinforcing role, the left reinforcing plate and the right reinforcing plate also play an arc-starting role as arc-starting plates.
[0010] In the ring main unit provided in the fifth aspect of the present invention, the left arc-starting plate, the top arc-starting plate, and the right arc-starting plate are each close to the front of the cabinet, and a roughly U-shaped bending portion facing the inside of the cable room is provided.
[0011] In the ring main unit provided in the sixth aspect of the present invention, a first pressure relief plate is movably provided at the bottom of the cable chamber, a second pressure relief plate is movably provided at the bottom of the pressure relief chamber, and a third pressure relief plate is movably provided on the partition between the cable chamber and the pressure relief chamber.
[0012] By utilizing the ring main unit of the present invention, the electric arc generated by the arc burning of the cable cone can be effectively guided, and the pressure relief channel can be reasonably arranged to facilitate rapid pressure release when the arc burning gas pressure rises sharply. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a partial stereoscopic view showing the ring main unit of the present invention.
[0014] Figure 2 It is a schematic diagram showing the components of the arc-proof structure of the ring main unit of the present invention.
[0015] Figure 3 It is a pressure relief passage diagram of the ring main unit of the present invention. DETAILED DESCRIPTION
[0016] In order to explain the present invention in more detail, the following describes the method for implementing the present invention according to the accompanying drawings. In the accompanying drawings, the same or corresponding reference numerals are used to represent the same or corresponding technical features.
[0017] Figure 1 FIG. 1 is a partial perspective view of the ring main unit of the present invention. For the sake of convenience, the front panel is omitted in the figure. Figure 1 As shown, the ring main unit 100 according to the present invention has a cable chamber. The cable chamber is roughly in the shape of a cube. Three (the number is not limited to this) cable cones 130 extend from the rear panel into the cable chamber for connecting with the copper busbar. As a new type of arc-proof structure used in the present invention, the top plate and the side plates on the left and right sides of the cable chamber are provided with a double-layer arc-starting structure. Figure 2 The arc-proof structure in the cable chamber of the ring main unit of the present invention is further described in detail.
[0018] Figure 2 1 is a schematic diagram showing the components of the arc-proof structure of the ring main unit of the present invention. For the sake of convenience, the front panel, the top plate of the cable chamber and the side plates on the left and right sides are omitted in the figure. The cable cone 130 is arranged at the upper part of the cable chamber.
[0019] Around the cable cone 130, a top reinforcing plate 113 is installed on the top plate on the side of the top plate facing the inside of the cable chamber. Furthermore, a top arc-starting plate 114 is installed on the side of the top reinforcing plate 113 facing the inside of the cable chamber. The top arc-starting plate 114 and the top reinforcing plate 113 overlap in double layers to form a double-layer structure.
[0020] Similarly, on the side of the left side plate facing the inside of the cable chamber, the left reinforcing plate 115 is installed on the left side plate. Further, the left arc-starting plate 116 is installed on the side of the left reinforcing plate 115 facing the inside of the cable chamber. On the side of the right side plate facing the inside of the cable chamber, the right reinforcing plate 117 is installed on the right side plate. Further, the right arc-starting plate 118 is installed on the side of the right reinforcing plate 117 facing the inside of the cable chamber.
[0021] The top reinforcing plate 113, the left reinforcing plate 115 and the right reinforcing plate 117 withstand the impact of the arcing gas pressure and absorb the arcing heat at the same time.
[0022] In addition to the reinforcement function, the left reinforcing plate 115 and the right reinforcing plate 117 also play the arc-starting function of the arc-starting plate. The left reinforcing plate 115 and the left arc-starting plate 116 are arranged at a certain distance from each other to form a step-like shape, thereby blocking the impact of the arc in a step-like manner. The right reinforcing plate 117 and the right arc-starting plate 118 are arranged at a certain distance from each other to form a step-like shape, thereby blocking the impact of the arc in a step-like manner.
[0023] In addition, back to Figure 1, a bending portion 119 is provided toward the inside of the cable chamber on the left arc-starting plate 116 near the front of the cabinet. The bending portion 119 can effectively guide the arc generated by the arcing of the cable cone 130 to the left arc-starting plate 116 and / or the left reinforcing plate 115, and as a sacrifice of the arcing, effectively prevent the impact of the arc airflow and consume the arc heat. Similarly, a bending portion is also formed on the top arc-starting plate 114 and the right arc-starting plate 118 near the front of the cabinet. The bending portion and the bending portion 119 play the same role of guiding the arc airflow and heat inward.
[0024] As described above, in the ring main unit of the present invention, the top reinforcing plate 113, the top arc-starting plate 114, the left reinforcing plate 115, the left arc-starting plate 116, the right reinforcing plate 117, and the right arc-starting plate 118 form a roughly inverted U-shaped arc-proof structure, which guides the arc airflow and heat caused by the arc to the protocol hole set at the bottom of the ring main unit. This point will be described in detail later.
[0025] Finally, refer to Figure 3 The arc striking process when an arc is generated in the ring main unit of the present invention is described.
[0026] like Figure 3 As shown in the figure (the right side plate is omitted for convenience), in addition to the aforementioned cable chamber 110, the ring main unit of the present invention also includes a pressure relief chamber 120. A pressure relief plate 111 is movably provided at the bottom of the cable chamber 110. A pressure relief plate 121 is movably provided at the bottom of the pressure relief chamber 120. A pressure relief plate 140 is movably provided on the partition between the cable chamber 110 and the pressure relief chamber 120.
[0027] As shown by the arrow, when an arc is generated at the cable cone 130, the airflow and heat caused by the arc diffuse downward under the guidance of the arc-proof structure composed of the top reinforcing plate 113, the top arc-starting plate 114, the left reinforcing plate 115, the left arc-starting plate 116, the right reinforcing plate 117, and the right arc-starting plate 118, and are discharged from the ring main unit 100 through the pressure relief plate 111. Another part of the airflow and heat enters the pressure relief chamber 120 through the pressure relief plate 140 on the partition, diffuses downward from the pressure relief chamber 120, and is discharged from the ring main unit 100 through the pressure relief plate 121.
[0028] As described above, the ring main unit of the present invention, through the guidance of the arc-proof structure composed of the top reinforcing plate 113, the top arc-starting plate 114, the left reinforcing plate 115, the left arc-starting plate 116, the right reinforcing plate 117, and the right arc-starting plate 118, rationally arranges the arc pressure relief channel, so as to facilitate the rapid release of pressure when the arc gas pressure rises sharply.
Claims
1. A ring main unit with an arc-proof structure, characterized in that: include: a cable chamber for accommodating at least one cable cone; as well as The pressure relief chamber connected to the cable chamber is used to discharge the airflow and / or heat generated by the arc to the outside of the ring main unit when an arc occurs at the at least one cable cone. Wherein, a double-layer arc-starting structure is arranged on the top plate and the side plates on the left and right sides of the cable chamber.
2. The ring main unit according to claim 1, characterized in that: A top reinforcing plate is installed on the side of the top plate facing the cable chamber, and a top arc-starting plate is installed on the side of the top reinforcing plate facing the cable chamber. The top arc-starting plate and the top reinforcing plate overlap each other to form a double-layer structure.
3. The ring main unit according to claim 2, characterized in that: A left reinforcing plate is installed on the side of the left plate facing the inside of the cable chamber, and a left arc-starting plate is installed on the side of the left reinforcing plate facing the inside of the cable chamber. The left reinforcing plate and the left arc-starting plate are arranged at a certain distance front and back to form a step shape. A right reinforcing plate is installed on the side of the right plate facing the inside of the cable chamber, and a right arc-starting plate is installed on the side of the right reinforcing plate facing the inside of the cable chamber. The right reinforcing plate and the right arc-starting plate are staggered a certain distance front and back to form a step shape.
4. The ring main unit according to claim 3, characterized in that: In addition to the reinforcement function, the left reinforcing plate and the right reinforcing plate also function as arc-starting plates.
5. The ring main unit according to claim 3, characterized in that: The left arc-starting plate, the top arc-starting plate, and the right arc-starting plate are each close to the front of the cabinet and are provided with a bending portion facing the interior of the cable chamber.
6. The ring main unit according to any one of claims 1 to 5, characterized in that: A first pressure relief plate is movably provided at the bottom of the cable chamber, a second pressure relief plate is movably provided at the bottom of the pressure relief chamber, and a third pressure relief plate is movably provided on a partition plate between the cable chamber and the pressure relief chamber.