Lightning protection device for reducing resistance of photovoltaic line grounding resistor

Abstract

The utility model discloses a photovoltaic line ground resistance resistance lightning protection device, including site, photovoltaic system and lightning protection component, the center of site installs photovoltaic system, and the periphery of photovoltaic system is installed with resistance soil zone that buries. Advantageous effect: set up the main ground net that surrounds the outside of photovoltaic system, through the reliable connection of the ground lead -on line of multipoint connection with photovoltaic system, scatter lightning current distribution, adopt the main ground net material of graphene ground belt, through the resistance rate of multiple parallel reduction, its conductivity and corrosion resistance are superior to traditional steel material, can reduce contact resistance, on this basis, since the main ground net is connected with photovoltaic system through the ground lead -on line of mesh arrangement, and the main ground net is laid on the top surface of rectangular resistance soil zone, and the main ground net is set in the pre -buried pit of resistance soil zone through the ground lead -down body, combines the resistance soil zone of low resistance rate soil and resistance agent filling combination, enlarge the current spreading range, promote the current spreading efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection device technology, specifically to a lightning protection device for reducing grounding resistance of photovoltaic lines. Background Technology

[0002] Lightning strikes are one of the major accidents in power systems, and substations are the hubs of these systems, bearing the crucial responsibility of supplying power to the grid. Because substations are directly connected to overhead lines, and the insulation level of these lines is higher than that of the electrical equipment within the substation, the amplitude of lightning strikes traveling along these lines to the substation is also very high. Without adequate protection facilities, the insulation of the main transformer or other electrical equipment within the substation may be damaged. Once a lightning strike occurs at a substation, damaging equipment, it can cause widespread power outages, resulting in significant losses and disruptions to production and daily life, with extremely serious consequences. Therefore, lightning protection for substations must be prioritized, and lightning protection measures must be highly reliable.

[0003] Currently, traditional photovoltaic substation lightning protection systems have at least the following drawbacks in actual use: traditional lightning protection measures for photovoltaic systems are not comprehensive or thorough. For example, they only protect the photovoltaic support components of the photovoltaic system from lightning, or they use a single type of lightning protection component, which poses safety hazards. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a photovoltaic line grounding resistance reduction and lightning protection device, which has the advantages of comprehensive resistance reduction and lightning protection and reduced safety hazards, thereby solving the problems mentioned in the background technology.

[0005] (II) Technical Solution To achieve the aforementioned advantages of comprehensive resistance reduction and lightning protection, and to reduce safety hazards, the specific technical solution adopted by this utility model is as follows: A photovoltaic line grounding resistance reduction and lightning protection device includes a site, a photovoltaic system, and lightning protection components. The photovoltaic system is installed at the center of the site, and a resistance-reducing soil strip is buried around the photovoltaic system. A main grounding grid is laid on the top surface of the resistance-reducing soil strip, and grounding leads are connected at multiple points on the inner side of the main grounding grid. The grounding leads are connected to the photovoltaic system through stainless steel piercing plates, and the grounding leads are crisscrossed to form a mesh structure. The main grounding grid is composed of multiple parallel graphene grounding strips, and a grounding lower body is welded to the bottom of the main grounding grid. The grounding lower body is buried deep in the resistance-reducing soil strip. Several lightning protection components are arranged around the resistance-reducing soil strip, and each lightning protection component is fixedly connected to the site. Each lightning protection component contains a grounding cable connected to the main grounding grid.

[0006] Furthermore, the lower part of the lightning protection component is provided with a hollow column, and the top of the hollow column is interference-connected with a vertical lightning rod. The bottom of the vertical lightning rod is welded and installed with a grounding cable, and the grounding cable is connected to the grounding lead of the main grounding grid. A horizontal lightning rod is welded and installed on the surface of the vertical lightning rod, and the horizontal lightning rod is set towards the photovoltaic system.

[0007] Furthermore, a pre-buried pit is provided inside the soil strip corresponding to the grounding lead, and the depth of the pre-buried pit is 2.5-3 meters.

[0008] Furthermore, the bottom of the hollow column is provided with a lead hole corresponding to the grounding cable, and several mounting blocks are welded around the side of the hollow column.

[0009] Furthermore, the material of the resistance-reducing soil strip is conductive concrete or with added salt, and the area of ​​the resistance-reducing soil strip is larger than the area of ​​the main grounding grid.

[0010] Furthermore, the main grounding grid is buried in the peripheral area of ​​the photovoltaic system, and the main grounding grid is arranged in a rectangular frame structure.

[0011] (III) Beneficial Effects Compared with the prior art, this utility model provides a photovoltaic line grounding resistance reduction and lightning protection device, which has the following beneficial effects: This invention features a main grounding grid surrounding the photovoltaic system. It is reliably connected to the photovoltaic system via multi-point grounding leads, dispersing lightning current distribution. Graphene grounding strips are used as the main grounding grid material, with multiple strips connected in parallel to reduce resistivity. Graphene's conductivity and corrosion resistance are superior to traditional steel, reducing contact resistance. Furthermore, the main grounding grid is connected to the photovoltaic system via a mesh-like arrangement of grounding leads, and is laid on top of a rectangular resistance-reducing soil strip. The main grounding grid is also installed within a pre-buried pit in the resistance-reducing soil strip via grounding leads. This combination of low-resistivity soil and resistance-reducing agent-filled soil strip expands the current dissipation range and improves current dissipation efficiency.

[0012] This invention improves the lightning protection effect and comprehensiveness of the photovoltaic system by installing several lightning protection components around the main grounding grid. Each component consists of a hollow column, a vertical lightning rod, a horizontal lightning rod, and a grounding cable. The hollow column increases the installation height and expands the protection range. The combination of vertical and horizontal lightning rods enhances the lightning interception effect. The grounding cable connects to the grounding conductor of the main grounding grid and is also potential-connected to the photovoltaic system's photovoltaic bracket, inverter casing, and cable metal sheath, eliminating potential difference risks and ensuring rapid conduction of lightning current to the ground. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a photovoltaic line grounding resistance reduction and lightning protection device according to an embodiment of the present utility model; Figure 2 It is a cross-sectional diagram of the site; Figure 3 This is a schematic diagram of the internal structure of a lightning protection component.

[0015] In the picture: 1. Site; 2. Photovoltaic system; 3. Main grounding grid; 4. Lightning protection components; 5. Grounding lead-in; 6. Resistance-reducing soil strip; 7. Grounding lead-out; 8. Pre-buried pit; 9. Hollow column; 10. Vertical lightning rod; 11. Horizontal lightning rod; 12. Mounting block; 13. Grounding cable. Detailed Implementation

[0016] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0017] According to an embodiment of this utility model, a photovoltaic line grounding resistance reduction and lightning protection device is provided.

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-3As shown, a photovoltaic line grounding resistance reduction and lightning protection device according to an embodiment of this utility model includes a site 1, a photovoltaic system 2, and a lightning protection component 4. The photovoltaic system 2 is installed at the center of the site 1, and a resistance-reducing soil strip 6 is buried around the photovoltaic system 2. A main grounding grid 3 is laid on the top surface of the resistance-reducing soil strip 6, and grounding leads 5 are connected at multiple points on the inner side of the main grounding grid 3. The grounding leads 5 are connected to the photovoltaic system 2 through stainless steel piercing plates, and the grounding leads 5 form a mesh structure with horizontal and vertical cross-sections. The main grounding grid 3 consists of multiple parallel grounding leads 5. The system consists of a graphene grounding strip and a grounding lead 7 welded to the bottom of the main grounding grid 3. The grounding lead 7 is buried deep within the resistance-reducing soil strip 6. Several lightning protection components 4 are installed around the resistance-reducing soil strip 6, and each lightning protection component 4 is fixedly connected to the site 1. Each lightning protection component 4 contains a grounding cable 13 connected to the main grounding grid 3. The main grounding grid 3 and the grounding lead 7 are connected in parallel at multiple points and filled with resistance-reducing agent to ensure that the overall grounding resistance meets the standard (lightning protection ≤10Ω, others ≤4Ω).

[0019] In one embodiment, a hollow column 9 is provided at the lower part of the lightning protection component 4, and a vertical lightning rod 10 is interference-connected to the top of the hollow column 9. A grounding cable 13 is welded to the bottom of the vertical lightning rod 10, and the grounding cable 13 is connected to the grounding lead 7 of the main grounding grid 3. A horizontal lightning rod 11 is welded to the surface of the vertical lightning rod 10, and the horizontal lightning rod 11 is set towards the photovoltaic system 2. By combining the vertical lightning rod 10 and the horizontal lightning rod 11, the lightning interception effect is increased. The grounding cable 13 is connected to the grounding lead 7 of the main grounding grid 3, and the grounding cable 13 is potential connected to the photovoltaic bracket, inverter shell, and cable metal sheath of the photovoltaic system 2 to eliminate the potential difference risk and ensure that the lightning current is quickly conducted to the ground. The grounding cable 13 is usually ≥50mm² copper or equivalent galvanized steel. The lightning protection component 4 and the grounding lead 7 are fastened by welding or bolting with galvanized steel, and the contact points are coated with conductive anti-corrosion paint.

[0020] In one embodiment, a pre-buried pit 8 is provided inside the soil strip 6 corresponding to the grounding lead 7, and the depth of the pre-buried pit 8 is 2.5-3 meters to improve the current dissipation efficiency.

[0021] In one embodiment, the bottom of the hollow column 9 is provided with a lead hole corresponding to the grounding cable 13, and several mounting blocks 12 are welded around the side of the hollow column 9, which facilitates the laying of the grounding cable 13 and the installation of the hollow column 9.

[0022] In one embodiment, the material of the resistance-reducing soil strip 6 is conductive concrete or sodium chloride with added salt, and the area of ​​the resistance-reducing soil strip 6 is larger than the area of ​​the main grounding grid 3. By combining the soil replacement method (replacing low resistivity soil) with the filling of resistance-reducing agent, the soil resistivity is reduced and the current dissipation range is expanded.

[0023] In one embodiment, the main grounding grid 3 is buried in the peripheral area of ​​the photovoltaic system 2, and the main grounding grid 3 is set in a rectangular frame structure. Graphene grounding strips are used as the main grounding grid material. Multiple strips are connected in parallel to reduce resistivity. Its conductivity and corrosion resistance are better than traditional steel, which can reduce contact resistance.

[0024] Working Principle: Graphene grounding strips are used as the main grounding grid 3 material. Multiple strips are connected in parallel to reduce resistivity. Their conductivity and corrosion resistance are superior to traditional steel, reducing contact resistance. They are reliably connected to the photovoltaic system 2 via multi-point grounding leads 5, dispersing lightning current distribution. Furthermore, since the main grounding grid 3 is connected to the photovoltaic system 2 through a mesh-like arrangement of grounding leads 5, and is laid on top of a rectangular resistivity-reducing soil strip 6, and is installed within the pre-buried pit 8 of the resistivity-reducing soil strip 6 via grounding leads 7, the combination of low-resistivity soil and resistivity-reducing agent filling in the soil strip 6 effectively expands the current dissipation range and improves... The system leverages the advantages of high current dissipation efficiency. Furthermore, by installing several lightning protection components 4 around the main grounding grid 3, each component 4 consists of a hollow column 9, a vertical lightning rod 10, a horizontal lightning rod 11, and a grounding cable 13. The hollow column 9 increases the installation height and expands the protection range. The combination of the vertical and horizontal lightning rods 10 enhances the lightning interception effect. The grounding cable 13 connects to the grounding lead-down body 7 of the main grounding grid 3, and is also potential-connected to the photovoltaic system 2's photovoltaic bracket, inverter casing, and cable metal sheath, eliminating potential difference risks and ensuring rapid conduction of lightning current to the ground.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A photovoltaic line grounding resistance reduction and lightning protection device, comprising a site (1), a photovoltaic system (2), and a lightning protection assembly (4), characterized in that, A photovoltaic system (2) is installed at the center of the site (1), and a resistance-reducing soil strip (6) is buried around the photovoltaic system (2). A main grounding grid (3) is laid on the top surface of the resistance-reducing soil strip (6), and a grounding lead wire (5) is connected to the inner side of the main grounding grid (3) at multiple points. The grounding lead wire (5) is connected to the photovoltaic system (2) through a stainless steel piercing plate, and the grounding lead wire (5) forms a mesh structure by crisscrossing. The main grounding grid (3) is composed of multiple parallel graphene grounding strips, and a grounding lead lower body (7) is welded to the bottom of the main grounding grid (3). The grounding lead lower body (7) is buried deep in the resistance-reducing soil strip (6). Several lightning protection components (4) are set around the resistance-reducing soil strip (6), and each lightning protection component (4) is fixedly connected to the site (1). Each lightning protection component (4) is equipped with a grounding cable (13) connected to the main grounding grid (3).

2. The photovoltaic line grounding resistance reduction and lightning protection device according to claim 1, characterized in that, The lower part of the lightning protection component (4) is provided with a hollow column (9), and the top of the hollow column (9) is connected with a vertical lightning rod (10). The bottom of the vertical lightning rod (10) is welded with a grounding cable (13), and the grounding cable (13) is connected to the grounding lead (7) of the main grounding grid (3). The surface of the vertical lightning rod (10) is welded with a horizontal lightning rod (11), and the horizontal lightning rod (11) is set towards the photovoltaic system (2).

3. The photovoltaic line grounding resistance reduction and lightning protection device according to claim 1, characterized in that, The soil strip (6) with resistance reduction is provided with a pre-buried pit (8) corresponding to the grounding lead (7), and the depth of the pre-buried pit (8) is 2.5-3 meters.

4. A photovoltaic line grounding resistance reduction and lightning protection device according to claim 2, characterized in that, The bottom of the hollow column (9) is provided with a lead hole corresponding to the grounding cable (13), and several mounting blocks (12) are welded around the side of the hollow column (9).

5. A photovoltaic line grounding resistance reduction and lightning protection device according to claim 1, characterized in that, The main grounding grid (3) is buried in the outer area of ​​the photovoltaic system (2), and the main grounding grid (3) is set in a rectangular frame structure.

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