Fan grounding system suitable for medium and strong corrosion areas

Abstract

The utility model discloses a fan grounding system suitable for medium, strong corrosion area, including foundation inner grounding net and foundation outer grounding net, foundation inner grounding net pre -buried setting in fan foundation and including foundation grounding ring and the radial direction extension of radiation line, radiation line is connected with foundation grounding ring, foundation outer grounding net includes outer grounding ring and anticorrosive ion grounding electrode, outer grounding ring adopts flexible graphene flat strip to make, the vertical grounding electrode adopts quick -wearing type graphene grounding electrode / anticorrosive ion grounding electrode, radiation line extends and extends out fan foundation, and between radiation line with outer grounding ring and between outer grounding ring with quick -wearing type graphene grounding electrode / anticorrosive ion grounding electrode all adopt mechanical connecting piece and connect, the utility model discloses a fan grounding system suitable for medium, strong corrosion area can effectively reduce material cost, and need not to connect electricity and weld, can reduce construction difficulty.

Description

Technical Field

[0001] This utility model belongs to the field of wind power generation technology, specifically a wind turbine grounding system suitable for medium and strong corrosion areas. Background Technology

[0002] To improve wind power generation efficiency, wind turbines are installed in areas with abundant wind resources. These turbines are typically located at high altitudes, usually the highest points in the surrounding area, and far from other tall objects. Therefore, the risk of lightning strikes on wind turbines is significantly increased. Consequently, a robust grounding system is crucial for ensuring the safe and stable operation of wind turbines.

[0003] In wind turbine construction projects located in moderately and severely corrosive areas, the grounding systems of most wind turbines still use copper or copper-clad steel grounding materials. Although these materials have good corrosion resistance, they are expensive. Furthermore, the grounding conductors (wires) made of copper or copper-clad steel require exothermic welding during construction, which is complex, time-consuming, and makes it difficult to guarantee construction quality and standardize construction practices. In particular, in areas without power supply, temporary diesel generators are needed during welding, potentially causing environmental pollution. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a wind turbine grounding system suitable for medium and strong corrosion areas, which can effectively reduce material costs and does not require electrical welding, thus reducing construction difficulty.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A wind turbine grounding system suitable for medium to strong corrosion areas includes an internal foundation grounding grid and an external foundation grounding grid. The internal foundation grounding grid is pre-embedded within the wind turbine foundation and includes a foundation grounding ring and radially extending radial lines, the radial lines being connected to the foundation grounding ring. The external foundation grounding grid includes an external grounding ring and grounding electrodes. The external grounding ring is made of flexible graphene flat strip, and the grounding electrode is a quick-install graphene grounding electrode and / or an anti-corrosion ion grounding electrode. The radial lines extend beyond the wind turbine foundation, and mechanical connectors are used to connect the radial lines to the external grounding ring and the external grounding ring to the grounding electrode.

[0006] Furthermore, the basic grounding ring includes a first inner grounding ring and a second inner grounding ring, the diameter of the first inner grounding ring being smaller than the diameter of the second inner grounding ring, and the radiating line being connected to the first inner grounding ring and the second inner grounding ring respectively.

[0007] Furthermore, the first inner grounding ring, the second inner grounding ring, and the outer grounding ring are coaxially arranged.

[0008] Furthermore, at the connection point where the radial line connects to the first inner grounding ring, a grounding lead extending in a vertically upward direction is provided, and the upper end of the grounding lead is exposed above the wind turbine foundation.

[0009] Furthermore, the radiating lines are evenly distributed in a ring of at least three lines.

[0010] Furthermore, the grounding electrode is located at the connection point between the radial line and the outer grounding ring.

[0011] Furthermore, the grounding electrode is a corrosion-resistant ion grounding electrode, which is inserted into the soil and located below the outer grounding ring. The upper end of the corrosion-resistant ion grounding electrode is provided with a protective cover, the lower end is provided with backfill soil, and high-energy backfill material is filled between the corrosion-resistant ion grounding electrode and the soil.

[0012] Furthermore, the grounding electrode is a quick-connect graphene grounding electrode, which is provided with a lead wire connected to the external grounding ring. The lead wire is made of graphene material, and the lead wire is connected to the external grounding ring by the mechanical connector.

[0013] Furthermore, the mechanical connector includes two high-strength clamping plates for clamping and fixing the external grounding ring and the lead wire, or for clamping and fixing the radiation wire and the external grounding ring, and the two high-strength clamping plates are fixedly connected by bolts.

[0014] Furthermore, the overlap distance between the external grounding ring and the lead wire at the connection position is greater than or equal to 180mm.

[0015] The beneficial effects of this utility model are as follows: This utility model discloses a wind turbine grounding system suitable for medium to strong corrosion areas. Its core feature is the use of graphene material with excellent corrosion resistance for the foundation external grounding grid. For example, the external grounding ring is made of flexible graphene flat strip, and the vertical grounding electrode is configured as a quick-install graphene grounding electrode and / or an anti-corrosion ion grounding electrode. Simultaneously, mechanical connectors are used to connect the external grounding ring to the grounding electrode and to the radial line, eliminating the need for traditional welding connections. This effectively solves the problems of high cost, complex construction, and reliance on external power for welding in traditional copper grounding systems in corrosive environments. It features simple construction, low cost, and excellent corrosion resistance, making it particularly suitable for combined grounding applications of wind turbines and transformer substations in wind farms. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration: Figure 1This is a schematic diagram of the structure of an embodiment of the wind turbine grounding system applicable to medium and strong corrosion areas according to this utility model; Figure 2 for Figure 1 AA section view; Figure 3 This is a schematic diagram of the installation of the anti-corrosion ion grounding electrode; Figure 4 This is a schematic diagram of the structure when two flexible graphene strips are connected. Figure 5 This is a schematic diagram of the structure when the grounding electrode is connected to the external grounding ring.

[0017] Explanation of reference numerals in the attached figures: 10-Wind turbine foundation; 11-First inner grounding ring; 12-Second inner grounding ring; 13-Radiation line; 14-Grounding lead-in line; 15-Outer grounding ring; 16-Grounding electrode; 17-Protective cover; 18-Backfill soil; 19-High-energy backfill material; 20-Lead-out line; 21-High-strength clamping plate; 22-Bolt. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0019] like Figure 1-2 As shown, this embodiment is applicable to wind turbine grounding systems in areas with moderate to strong corrosion, including an internal foundation grounding grid and an external foundation grounding grid. Specifically, the internal foundation grounding grid is pre-embedded within the wind turbine foundation 10 and includes a foundation grounding ring and radially extending radial lines 13, which are connected to the foundation grounding ring. Specifically, in this embodiment, the foundation grounding ring includes a first inner grounding ring 11 and a second inner grounding ring 12, the diameter of the first inner grounding ring 11 being smaller than the diameter of the second inner grounding ring 12. The radial lines 13 are connected to the first inner grounding ring 11 and the second inner grounding ring 12 respectively. At the connection point where the radial lines 13 connect to the first inner grounding ring 11, a grounding lead 14 extending vertically upwards is provided, the upper end of which protrudes from the wind turbine foundation 10 for grounding steel components on the ground. Specifically, the internal foundation grounding grid can be made of traditional metal materials; in this embodiment, the internal foundation grounding grid is made of hot-dip galvanized flat steel.

[0020] In this embodiment, the foundation external grounding grid includes an external grounding ring 15 and a grounding electrode 16. The external grounding ring 15 is made of flexible graphene flat strip, and the vertical grounding electrode 16 is a quick-install graphene grounding electrode and / or a corrosion-resistant ion grounding electrode. Radial lines 13 extend beyond the wind turbine foundation 10, and are mechanically connected to the external grounding ring 15 and the external grounding ring 15 to the grounding electrode 16. In this embodiment, the first inner grounding ring 11, the second inner grounding ring 12, and the external grounding ring 15 are coaxially arranged, and at least three radial lines 13 are evenly distributed in a ring. In this embodiment, at least six radial lines 13 are evenly distributed in a ring.

[0021] like Figure 3 As shown, in this embodiment, the grounding electrode 16 is located at the connection point between the radiation line 13 and the outer grounding ring 15. Specifically, when the grounding electrode 16 is a corrosion-resistant ion grounding electrode, it is inserted into the soil and positioned below the outer grounding ring 15. The upper end of the corrosion-resistant ion grounding electrode is equipped with a protective cover 17, and the lower end is equipped with backfill soil 18. High-energy backfill material 19 is filled between the corrosion-resistant ion grounding electrode and the soil, thus reducing the resistance of the corrosion-resistant ion grounding electrode. Specifically, quick-install graphite grounding electrodes are typically used in areas with low resistivity. If the resistivity is high, the quick-install graphite grounding electrodes can be gradually replaced with corrosion-resistant ion grounding electrodes according to the degree of resistivity increase, thereby reducing resistance. That is, the function of the corrosion-resistant ion grounding electrode is to reduce resistance when the soil resistivity at the location of the wind turbine is high, thereby ensuring that the grounding resistance of the entire wind turbine grounding network meets the requirement of less than 4Ω. Specifically, the number of corrosion-resistant ion grounding electrodes to be replaced depends on the actual resistivity; the higher the resistivity, the more electrodes need to be replaced, or additional corrosion-resistant ion grounding electrodes may be required. In this embodiment, when the resistivity is low, the grounding electrode 16 can use only quick-install graphite grounding electrodes; when the resistivity is high, the grounding electrode 16 can use a combination of quick-install graphite grounding electrodes and anti-corrosion ion grounding electrodes; as the resistivity increases, the grounding electrode 16 may need to use all anti-corrosion ion grounding electrodes. If the grounding resistance of the entire wind turbine grounding network still does not meet the requirement of less than 4Ω, then the number of anti-corrosion ion grounding electrodes needs to be increased.

[0022] Specifically, when the grounding electrode 16 adopts a quick-connect graphene grounding electrode, the quick-connect graphene grounding electrode is provided with a lead wire 20 connected to the external grounding ring 15. The lead wire 20 is made of graphene material, and the lead wire 20 is connected to the external grounding ring 15 by a mechanical connector, such as... Figure 5 As shown.

[0023] like Figure 4-5As shown, in this embodiment, the mechanical connector includes two high-strength clamping plates 21 for clamping and fixing the external grounding ring 15 and the lead wire 20, or for clamping and fixing the radiation wire 13 and the external grounding ring 15. The two high-strength clamping plates 21 are fixedly connected by bolts 22. To improve the electrical connection performance, in this embodiment, the overlap distance between the external grounding ring 15 and the lead wire 20 at the connection position is greater than or equal to 180mm.

[0024] In this embodiment, the maximum frost depth is considered to be 3 meters under extreme conditions. The external grounding ring 15 is laid below the frost layer, that is, the burial depth of the external grounding ring 15 is greater than or equal to 3 meters. In this embodiment, the external grounding ring 15 is arranged in a ring shape with an outer diameter of 26 meters. The flexible graphene flat strip 14 has a specification of -60mm×6mm, and the grounding electrode 16 has a diameter of 30mm and a length of 2.5m.

[0025] In this embodiment, the relevant parameters of the wind turbine grounding system are as follows: At a burial depth of 3.0 meters, the soil resistivity is taken as ρ = 50 Ω·m; The diameter D of the external grounding ring 12 is 26 meters, and the radius r is 13 meters; The horizontal grounding ring network is buried at a depth of h = 3 meters; The total area of ​​the horizontal grounding ring network is S = 530.66 sq.m. The diameter or equivalent diameter of grounding electrode 16 is d = 0.03 meters; The total length of the outer edge of the external grounding ring 12 is L0 = 2πr = 81.64 meters; The total length of the horizontal grounding ring network is L = 370 meters; but: B = 1 / [1 + 4.6h / SQRT(S)] = 0.6254 α1={3*LN[L0 / (S^0.5)]-0.2}*S^0.5 / L0=1.0146 Re=0.213ρ / (S^0.5)*(1+B)+ρ / 2 / π / L*[LN(S / 9 / h / d)-5*B]= 0.8237 Rn=α1Re=0.8357Ω<4Ω Where: B is the intermediate parameter for calculating the grounding resistance (Ω) of the equivalent square grounding grid; α1 is the correction coefficient for converting the square grounding grid into an arbitrary-shaped edge closed grounding grid; Re is the grounding resistance (Ω) of the equivalent (i.e., equal area and equal total length of horizontal grounding electrodes) square grounding grid; Rn is the resistance of the wind turbine grounding system; SQRT(·) is the square root function; LN(·) is the natural logarithm function.

[0026] In this embodiment, the resistance of the wind turbine grounding system meets the requirement of Rn≤4Ω.

[0027] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A fan grounding system suitable for use in medium and strong corrosive areas, characterized in that: It includes an internal grounding grid and an external grounding grid; the internal grounding grid is pre-embedded in the wind turbine foundation and includes a grounding ring and radial lines extending in the radial direction, the radial lines being connected to the grounding ring; The basic external grounding grid includes an external grounding ring and a grounding electrode. The external grounding ring is made of flexible graphene flat strip, and the grounding electrode is a quick-install graphene grounding electrode and / or a corrosion-resistant ion grounding electrode. The radial line extends beyond the wind turbine foundation, and the radial line is connected to the external grounding ring and the external grounding ring is connected to the grounding electrode by mechanical connectors.

2. The fan grounding system suitable for medium and strong corrosion areas according to claim 1, characterized in that: The basic grounding ring includes a first inner grounding ring and a second inner grounding ring. The diameter of the first inner grounding ring is smaller than the diameter of the second inner grounding ring. The radiating line is connected to the first inner grounding ring and the second inner grounding ring respectively.

3. The fan grounding system suitable for medium and strong corrosion areas according to claim 2, characterized in that: The first inner grounding ring, the second inner grounding ring, and the outer grounding ring are coaxially arranged.

4. The fan grounding system suitable for medium and strong corrosion areas according to claim 2, characterized in that: At the connection point where the radial line connects to the first inner grounding ring, a grounding lead extending in a vertically upward direction is provided, with the upper end of the grounding lead protruding from the wind turbine foundation.

5. The fan grounding system suitable for medium and strong corrosion areas according to claim 1, characterized in that: The radiation lines are evenly distributed in a ring, consisting of at least three lines.

6. The fan grounding system suitable for medium and strong corrosion areas according to claim 1, characterized in that: The grounding electrode is located at the connection point between the radiation line and the outer grounding ring.

7. The fan grounding system suitable for medium and strong corrosion areas according to claim 1, characterized in that: The grounding electrode is a corrosion-resistant ion grounding electrode, which is inserted into the soil and located below the outer grounding ring. The upper end of the corrosion-resistant ion grounding electrode is provided with a protective cover, and the lower end is provided with backfill soil. High-energy backfill material is filled between the corrosion-resistant ion grounding electrode and the soil.

8. The fan grounding system suitable for medium and strong corrosion areas according to claim 1, characterized in that: The grounding electrode is a quick-connect graphene grounding electrode, which is provided with a lead wire that connects to the external grounding ring. The lead wire is made of graphene material, and the lead wire is connected to the external grounding ring by the mechanical connector.

9. The fan grounding system suitable for medium, strong corrosion area according to claim 8, characterized in that: The mechanical connector includes two high-strength clamping plates for clamping and fixing the external grounding ring and the lead wire, or for clamping and fixing the radiation wire and the external grounding ring, and the two high-strength clamping plates are fixedly connected by bolts.

10. The fan grounding system suitable for medium and strong corrosion areas according to claim 9, characterized in that: The overlap distance between the external grounding ring and the lead wire at the connection point is greater than or equal to 180 mm.

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