Sealed switch cabinet power distribution device with multistage grounding shielding
The switchgear power distribution device, with its multi-level grounding shielding and sealed design, solves the safety hazards caused by electric arcs and overvoltages during lightning strikes, achieving equipment safety protection and reducing electromagnetic interference.
Patent Information
- Application Number
- CN202511151688.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-18
- Publication Date
- 2025-11-14
AI Technical Summary
When existing switchgear is struck by lightning, a single grounding wire cannot connect all the electric arc and overvoltage to the ground, which can easily cause electrical components to break down and fires, posing a safety hazard.
The sealed switchgear power distribution device adopts multi-level grounding shielding. Through the segmented multi-level grounding method of grounding wire one and grounding wire two, combined with solenoid valves and sealing mechanisms, current diversion and sealing are achieved to avoid high-potential backflash and electric arc combustion.
It effectively protects personnel and equipment safety, prevents fires, reduces interference from lightning electromagnetic fields on internal equipment, and improves the redundancy and electromagnetic compatibility of the grounding system.
Smart Images
Figure CN120955458A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power distribution equipment technology, specifically to a sealed switchgear power distribution device with multi-level grounding shielding. Background Technology
[0002] The main function of switchgear is to open, control and protect electrical equipment during the power generation, transmission, distribution and energy conversion processes of the power system. According to the different cabinet structures, switchgear can be divided into open switchgear, metal-enclosed switchgear and metal-enclosed armored switchgear. When metal-enclosed switchgear is struck by lightning, the overvoltage and electric arc generated by the lightning strike can easily cause switchgear fire.
[0003] When existing switchgear is struck by lightning, the lightning generates an electric arc or overvoltage inside the cabinet. The existing grounding wire can only connect the leakage voltage to the ground. A single grounding wire cannot connect all the electric arc and overvoltage to the ground. The electric arc inside the switchgear can easily damage electrical components and even cause a fire, posing a safety hazard during use. Therefore, we propose a sealed switchgear power distribution device with multi-level grounding shielding. Summary of the Invention
[0004] The purpose of this invention is to provide a sealed switchgear power distribution device with multi-level grounding shielding to solve the problems mentioned in the background art, such as the inability of a single grounding wire to connect all electric arcs and overvoltages to the ground, the easy damage of electric arcs in the switchgear to electrical components, and even fires, which pose safety hazards during use.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealed switchgear power distribution device with multi-level grounding shielding, comprising a power distribution cabinet body, wherein a wire hole is opened at the bottom of the power distribution cabinet body, and a grounding wire is fixedly connected to the inner wall of the power distribution cabinet body, wherein the grounding wire is located inside the wire hole, and the other end of the grounding wire is located outside the power distribution cabinet body; The grounding mechanism is located outside the main body of the distribution cabinet. The grounding mechanism includes a grounding box fixedly connected to the periphery of a grounding wire. The grounding box is located below the main body of the distribution cabinet. An electromagnetic valve is provided inside the grounding box and is located on one side of the grounding wire. A sealing mechanism is located below the wire hole, and the sealing mechanism is capable of sealing the wire hole when the grounding mechanism is energized.
[0006] The grounding mechanism includes a grounding wire and a connecting wire fixedly connected to the outer wall. One end of the connecting wire, away from the grounding wire, is connected to the solenoid valve circuit. The connecting wire is located inside the grounding box.
[0007] The solenoid valve has a sliding hole inside, a spring is fixedly connected to the inner wall of the sliding hole, a sliding rod is fixedly connected to the end of the spring away from the inner wall of the sliding hole, and a U-shaped plate is fixedly connected to the end of the sliding rod away from the spring. The U-shaped plate is located on one side of the grounding wire.
[0008] The sliding rod is fixedly connected to a second grounding wire at the end away from the U-shaped plate. The second grounding wire is located in the center of the spring and is slidably connected to the spring. The end of the second grounding wire away from the sliding rod is connected to the ground.
[0009] The sealing mechanism includes a fixing ring fixedly connected to the bottom of the main body of the distribution cabinet. Multiple fixing rods are fixedly connected inside the fixing ring. Each fixing rod is arranged in a ring. A sealing plate is rotatably connected to the periphery of each fixing rod. A fixing groove is opened at one end of the fixing ring near the main body of the distribution cabinet. The sealing plate is located inside the fixing groove and is slidably connected to the fixing groove.
[0010] The outer wall of the fixed ring is fixedly connected with multiple baffles, and an electromagnet is provided between every two baffles. The electromagnets are fixedly connected to the outer wall of the fixed ring, and the number of electromagnets corresponds to the number of sealing plates.
[0011] The fixed ring has a rotating ring at the end away from the main body of the distribution cabinet. The rotating ring is rotatably connected to the fixed ring. An electromagnetic rod is fixedly connected at the end of the rotating ring closer to the main body of the distribution cabinet. The electromagnetic rod is located around the electromagnet and is in contact with the electromagnet.
[0012] The electromagnetic rod is located on one side of the baffle and at one end of the arc surface of the sealing plate.
[0013] The electromagnet is connected to the solenoid valve circuit.
[0014] The present invention has at least the following beneficial effects: When this invention is in use, if current flows through grounding wire one, the solenoid valve of the grounding mechanism surrounding grounding wire one is energized, which drives the U-shaped plate to press tightly against grounding wire one, so that grounding wire one forms a path with grounding wire two through the U-shaped plate. This segmented multi-level grounding method can avoid high-potential backflash caused by faults such as lightning strikes and short circuits, protecting the safety of personnel and equipment. At the same time, during multi-level grounding shielding, the grounding mechanism drives the sealing mechanism to seal the main body of the distribution cabinet. The sealed main body of the distribution cabinet can attenuate the electromagnetic field of lightning and reduce its interference to sensitive internal electronic equipment. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of the power distribution cabinet of the present invention; Figure 2 This is a schematic diagram of the internal structure of the power distribution cabinet of the present invention; Figure 3This is a schematic diagram of the bottom structure of the power distribution cabinet of the present invention; Figure 4 This is a cross-sectional view of the grounding box of the present invention; Figure 5 This is a cross-sectional view of the solenoid valve of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram of area A in the middle; Figure 7 This is a schematic diagram of the U-shaped plate structure of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram of area B in the middle; Figure 9 This is a schematic diagram of the exploded structure of the sealing mechanism of the present invention.
[0016] In the diagram: 1. Main body of the distribution cabinet; 11. Wire hole; 12. Grounding wire one; 2. Grounding mechanism; 21. Grounding box; 22. Solenoid valve; 23. Connecting wire; 24. Sliding hole; 25. Spring; 27. Sliding rod; 28. U-shaped plate; 29. Grounding wire two; 3. Sealing mechanism; 31. Fixing ring; 32. Fixing rod; 33. Sealing plate; 34. Fixing groove; 35. Baffle; 36. Electromagnet; 37. Rotating ring; 38. Electromagnetic rod. Detailed Implementation
[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] Please see Figures 1-9 The present invention provides a technical solution: a sealed switchgear power distribution device with multi-level grounding shielding, including a power distribution cabinet body 1, a wire hole 11 is opened at the bottom of the power distribution cabinet body 1, a grounding wire 12 is fixedly connected to the inner wall of the power distribution cabinet body 1, the grounding wire 12 is located inside the wire hole 11, and the other end of the grounding wire 12 is located outside the power distribution cabinet body 1. Grounding mechanism 2, which is located outside the main body 1 of the distribution cabinet, includes a grounding box 21 fixedly connected to the periphery of the grounding wire 12. The grounding box 21 is located below the main body 1 of the distribution cabinet. An electromagnetic valve 22 is provided inside the grounding box 21, and the electromagnetic valve 22 is located on one side of the grounding wire 12. A sealing mechanism 3 is located below the wire hole 11, and the sealing mechanism 3 can seal the wire hole 11 when the grounding mechanism 2 is energized; When the present invention is in use, when current flows through the grounding wire 12, the solenoid valve 22 of the grounding mechanism 2 around the grounding wire 12 is energized, which drives the U-shaped plate 28 to closely adhere to the grounding wire 12, so that the grounding wire 12 forms a path with the grounding wire 29 through the U-shaped plate 28. This segmented multi-level grounding method can avoid high-potential backflash caused by lightning strikes, short circuits and other faults, and protect the safety of personnel and equipment. At the same time, during multi-level grounding shielding, the grounding mechanism 2 drives the sealing mechanism 3 to seal the main body 1 of the distribution cabinet. The sealed main body 1 of the distribution cabinet can attenuate the electromagnetic field of lightning and reduce its interference to the internal sensitive electronic equipment.
[0019] The grounding mechanism 2 includes a connecting line 23 fixedly connected to the outer wall of the grounding wire 12. The end of the connecting line 23 away from the grounding wire 12 is connected to the circuit of the solenoid valve 22. The connecting line 23 is located inside the grounding box 21. The solenoid valve 22 has a sliding hole 24 inside. A spring 25 is fixedly connected to the inner wall of the sliding hole 24. A sliding rod 27 is fixedly connected to the end of the spring 25 away from the inner wall of the sliding hole 24. A U-shaped plate 28 is fixedly connected to the end of the sliding rod 27 away from the spring 25. The U-shaped plate 28 is located on the side of the grounding wire 12. Among them, the sliding rod 27 is fixedly connected to the end away from the U-shaped plate 28 with a grounding wire 29. The grounding wire 29 is located in the center of the spring 25 and is slidably connected to the spring 25. The end of the grounding wire 29 away from the sliding rod 27 is connected to the ground. When the main body of the distribution cabinet 1 leaks current or is struck by lightning, the current is connected to the ground through the grounding wire 12. At the same time, when there is current flowing through the grounding wire 12, it flows through the solenoid valve 22 through the connecting wire 23. When the solenoid valve 22 is energized, the sliding rod 27 is pushed out from the sliding hole 24. The U-shaped plate 28 at the end of the sliding rod 27 contacts the grounding wire 12. At this time, part of the current of the grounding wire 12 flows through the sliding rod 27 via the U-shaped plate 28 to the grounding wire 29, which can realize the multi-level grounding shielding function of the grounding wire. After the lightning strike ends, the spring 25 pulls the sliding rod 27 back. At this time, the U-shaped plate 28 no longer adheres to the grounding wire 12, and the grounding wire 12 can still return to normal working state. When grounding wire 12 leaks current or is struck by lightning, causing a large current to flow through it, part of the current drives the solenoid valve 22 through the connecting wire 23, causing the sliding rod 27 to extend. The U-shaped plate 28 then contacts grounding wire 12, forming a secondary shunt path consisting of the main grounding wire, U-shaped plate 28, sliding rod 27, and grounding wire 29. Grounding wire 29 serves as a redundancy backup, sharing some of the current. Even if grounding wire 12 is damaged, such as partially melted, grounding wire 29 can still discharge current, preventing current concentration from causing equipment damage or fire. At the same time, the inductance of the secondary path forms a parallel resonance with the main grounding wire, providing a low-impedance path for high-frequency lightning current. Furthermore, the multi-stage shunt reduces the transient voltage drop of the single-point grounding resistance, reducing backflash voltage to nearby equipment. Therefore, the multi-stage grounding, driven by the dynamic shunt mechanism of the solenoid valve 22, improves the redundancy, safety, and electromagnetic compatibility of the grounding system, making it suitable for high-risk or high-reliability scenarios.
[0020] Among them, the resonance condition is: In a parallel circuit containing resistors, an inductor L and a capacitor C, when the combined current flowing through the parallel circuit is in phase with the power supply voltage, produce parallel resonance. At resonance, due to the oscillating energy, a large circulating current is generated between the inductor and the capacitor, resulting in current resonance in the parallel circuit. The parallel resonant circuit stores circuit energy in the magnetic field of the inductor and the electric field of the capacitor. This energy is continuously transferred back and forth between the inductor and the capacitor, leading to zero current and energy extraction from the power supply. Resonance occurs When the two reactances are equal, that is This situation will occur. , f is the frequency, L is the inductance, and C is the capacitance; At resonance, the parallel LC resonant circuit acts like an open circuit, and the circuit current is determined solely by the resistance R. Therefore, at resonance, the total impedance of the parallel resonant circuit becomes the resistance value in the circuit, and Z = R. At resonance, the impedance of the parallel circuit is at its maximum value, equal to the circuit resistance, thus creating a circuit condition of high resistance and low current. Also at resonance, since the circuit impedance is now only the resistance of the resistor, the total circuit current I will be equal to the supply voltage. "Same phase".
[0021] The sealing mechanism 3 includes a fixing ring 31 fixedly connected to the bottom of the power distribution cabinet body 1. Multiple fixing rods 32 are fixedly connected inside the fixing ring 31. Each fixing rod 32 is arranged in a ring. A sealing plate 33 is rotatably connected to the periphery of each fixing rod 32. A fixing groove 34 is opened at one end of the fixing ring 31 near the power distribution cabinet body 1. The sealing plate 33 is located inside the fixing groove 34 and is slidably connected to the fixing groove 34. The outer wall of the fixing ring 31 is fixedly connected with a plurality of baffles 35, and an electromagnet 36 is provided between every two baffles 35. The electromagnets 36 are fixedly connected to the outer wall of the fixing ring 31, and the number of electromagnets 36 corresponds to the number of sealing plates 33. Among them, a rotating ring 37 is provided at the end of the fixed ring 31 away from the main body 1 of the distribution cabinet. The rotating ring 37 is rotatably connected to the fixed ring 31. An electromagnetic rod 38 is fixedly connected at the end of the rotating ring 37 close to the main body 1 of the distribution cabinet. The electromagnetic rod 38 is located around the electromagnet 36 and is attached to the electromagnet 36. The electromagnetic rod 38 is located on one side of the baffle 35, and the electromagnetic rod 38 is located at one end of the arc surface of the sealing plate 33; The electromagnet 36 is connected to the solenoid valve 22 in a circuit. When the solenoid valve 22 is energized, the electromagnet 36 is connected to the solenoid valve 22 in the circuit. When the solenoid rod 38 located on the periphery of the electromagnet 36 contacts the energized electromagnet 36, the solenoid rod 38 is located on the periphery of the electromagnet 36 and slides along the trajectory of the electromagnet 36. When the solenoid rod 38 slides, it can push the sealing plate 33 to rotate around the fixed rod 32. When the solenoid rod 38 slides to the baffle 35 at the other end, it stops. At this time, the sealing plate 33 slides inside the fixed groove 34 opened in the fixed ring 31. Multiple sealing plates 33 rotate in coordination. Each sealing plate 33 contacts each other and can seal the wire hole 11, leaving only the ground wire 12 located in the center of the wire hole 11, which can realize the sealing of the main body 1 of the distribution cabinet. In the event of a lightning strike or electrical leakage, the sealing plate 33 closes quickly, confining the electric arc inside the main body 1 of the distribution cabinet. The sealed main body 1 of the distribution cabinet limits the range of the electric arc, preventing the electric arc caused by the lightning strike from igniting the combustibles inside the cabinet and avoiding damage to external personnel or equipment. In addition, the sealed main body 1 of the distribution cabinet isolates the air circulation. Even if the main body 1 of the distribution cabinet burns due to lightning strike or electrical leakage, it is difficult for the sealed main body 1 of the distribution cabinet to continue burning after the oxygen inside the main body 1 is exhausted. This greatly protects the electrical components and prevents fires. Moreover, the physical isolation completely blocks the wire hole 11 from the external environment, preventing the electric arc from leaking out.
[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A sealed switchgear power distribution device with multi-level grounding shielding, including: The main body of the power distribution cabinet (1) has a wire hole (11) at the bottom. A grounding wire (12) is fixedly connected to the inner wall of the main body of the power distribution cabinet (1). The grounding wire (12) is located inside the wire hole (11), and the other end of the grounding wire (12) is located outside the main body of the power distribution cabinet (1). Its characteristic is that it further includes: Grounding mechanism (2), the grounding mechanism (2) is located outside the main body (1) of the distribution cabinet, the grounding mechanism (2) includes a grounding box (21) fixedly connected to the periphery of the grounding wire (12), the grounding box (21) is located below the main body (1) of the distribution cabinet, the grounding box (21) is provided with a solenoid valve (22), the solenoid valve (22) is located on one side of the grounding wire (12); A sealing mechanism (3) is located below the wire hole (11) and is capable of sealing the wire hole (11) when the grounding mechanism (2) is energized.
2. The sealed switchgear power distribution device with multi-level grounding shielding according to claim 1, characterized in that: The grounding mechanism (2) includes a connecting line (23) fixedly connected to the outer wall of the grounding wire (12). The end of the connecting line (23) away from the grounding wire (12) is connected to the circuit of the solenoid valve (22). The connecting line (23) is located inside the grounding box (21).
3. The sealed switchgear power distribution device with multi-level grounding shielding according to claim 1, characterized in that: The solenoid valve (22) has a sliding hole (24) inside. A spring (25) is fixedly connected to the inner wall of the sliding hole (24). A sliding rod (27) is fixedly connected to the end of the spring (25) away from the inner wall of the sliding hole (24). A U-shaped plate (28) is fixedly connected to the end of the sliding rod (27) away from the spring (25). The U-shaped plate (28) is located on the side of the grounding wire (12).
4. The sealed switchgear power distribution device with multi-level grounding shielding according to claim 3, characterized in that: The sliding rod (27) is fixedly connected to a grounding wire (29) at the end away from the U-shaped plate (28). The grounding wire (29) is located in the center of the spring (25) and is slidably connected to the spring (25). The end of the grounding wire (29) away from the sliding rod (27) is connected to the ground.
5. The sealed switchgear power distribution device with multi-level grounding shielding according to claim 1, characterized in that: The sealing mechanism (3) includes a fixing ring (31) fixedly connected to the bottom of the main body (1) of the power distribution cabinet. Multiple fixing rods (32) are fixedly connected inside the fixing ring (31). Each fixing rod (32) is arranged in a ring. A sealing plate (33) is rotatably connected to the periphery of each fixing rod (32). A fixing groove (34) is opened at one end of the fixing ring (31) near the main body (1) of the power distribution cabinet. The sealing plate (33) is located inside the fixing groove (34) and is slidably connected to the fixing groove (34).
6. The sealed switchgear power distribution device with multi-level grounding shielding according to claim 5, characterized in that: The outer wall of the fixed ring (31) is fixedly connected to multiple baffles (35), and an electromagnet (36) is provided between every two baffles (35). The electromagnets (36) are fixedly connected to the outer wall of the fixed ring (31), and the number of electromagnets (36) corresponds to the number of sealing plates (33).
7. The sealed switchgear power distribution device with multi-level grounding shielding according to claim 6, characterized in that: A rotating ring (37) is provided at the end of the fixed ring (31) away from the main body (1) of the distribution cabinet. The rotating ring (37) is rotatably connected to the fixed ring (31). An electromagnetic rod (38) is fixedly connected at the end of the rotating ring (37) close to the main body (1) of the distribution cabinet. The electromagnetic rod (38) is located around the electromagnet (36) and fits against the electromagnet (36).
8. The sealed switchgear power distribution device with multi-level grounding shielding according to claim 7, characterized in that: The electromagnetic rod (38) is located on one side of the baffle (35), and the electromagnetic rod (38) is located at one end of the arc surface of the sealing plate (33).
9. The sealed switchgear power distribution device with multi-level grounding shielding according to claim 7, characterized in that: The electromagnet (36) is connected to the solenoid valve (22) in a circuit.