Claw-type grounding device for current diffusion of tower

Abstract

The invention provides a tower grounding device which is characterized in that the number of tower bases of a tower is four, the tower bases are arranged in a quadrilateral mode to form a quadrilateral area, the tower grounding device comprises a plurality of claw-shaped grounding electrodes and horizontal grounding wires, and the grounding wires extend outwards by 45 degrees along the tower bases of the tower and are arranged in a radial mode. When a tower is in an area with soil resistivity of more than 2000 ohm meters, the number of the claw-shaped grounding electrodes is four, the number of the horizontal grounding wires is four, the four claw-shaped grounding electrodes are respectively arranged at the tail ends of four epitaxial rays on the grounding wires, and grounding reinforcing materials are laid around the four claw-shaped grounding electrodes. And the periphery of the rectangular frame formed by the four claw-type grounding electrodes is also coated with a grounding reinforcing material. The grounding device is wide in application range and long in service life, the number and the angle of the claw type grounding electrodes and the number of the grounding wires, the grounding reinforcing materials and the electrolytic ion grounding electrodes can be reasonably adjusted according to the soil resistivity, and the impact grounding resistance and the laying difficulty of the grounding device can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of power transmission line grounding, and in particular to a claw-type tower grounding device. Background Art

[0002] The tower grounding device is an important part of the transmission line. It is the general term for the grounding body and the grounding down conductor. Its function is to ensure that the lightning current is reliably and quickly discharged into the earth, protect the insulation of the transmission line equipment, ensure the safe and stable operation of the line, reduce the number of line lightning tripping, and avoid personal injury caused by step voltage.

[0003] The existing tower grounding device has the following defects:

[0004] 1) The galvanized steel grounding grid is severely corroded.

[0005] According to a survey on the grounding of the national power system conducted by authoritative units such as the Wuhan Institute of High Voltage, the service life of galvanized steel grounding grid is only 7-15 years, which does not meet the 60-year requirement.

[0006] 2) The high temperature during electric welding destroys the galvanized layer, causing serious corrosion of the ground grid joints.

[0007] 3) Many engineering projects have severe soil environments and small land areas, which makes it difficult to achieve the requirement of low grounding resistance.

[0008] 4) The use of various resistance-reducing materials can easily accelerate the corrosion of the grounding main grid. Summary of the invention

[0009] Based on this, it is necessary to provide a tower grounding device that is not easy to corrode, has a long service life, is easy to lay, and has a wide range of applications.

[0010] A claw-type pole tower grounding device, the pole tower has four tower bases arranged in a quadrilateral to form a quadrilateral area, the pole tower grounding device comprises a plurality of claw-type grounding electrodes and horizontal grounding wires, the grounding wires are respectively extended outward from the tower base of the pole tower in the form of rays, and the claw-type grounding electrodes are arranged at the ends of the rays;

[0011] When the pole tower is in an area where the soil resistivity is less than 100 ohm-meter, the inclination of the claw-type grounding electrode is 30°, the length of the claw-type grounding electrode is between 0m-1m, the number of the claw-type grounding electrodes is 0 or 1, and the claw-type grounding electrode is arranged at the extended end of the grounding wire.

[0012] When the pole tower is in an area with a soil resistivity of 100-200 ohm-meter, the inclination of the claw-type grounding electrode is 30°, the length of the claw-type grounding electrode is between 0m-1m, the number of the claw-type grounding electrodes is 1, and the claw-type grounding electrode is arranged at the extended end of the horizontal grounding wire.

[0013] When the pole tower is in an area with a soil resistivity of 200-500 ohm-meter, the inclination of the claw-type grounding electrode is 30°-45°, the length of the claw-type grounding electrode is between 0m-1m, the number of the claw-type grounding electrodes is 1-2, and the claw-type grounding electrode is arranged at the extended end diagonally or on the same side of the grounding wire.

[0014] When the pole tower is in an area with a soil resistivity of 500 to 1000 ohm-meter, the inclination of the claw-type grounding electrode is 30°-45°, the number of the claw-type grounding electrodes is 2-3, the length of the claw-type grounding electrode is 1-2m, and the claw-type grounding electrode is arranged at the extended end of the grounding wire.

[0015] When the pole tower is in an area where the soil resistivity is 1000-2000 ohm-meter, the inclination of the claw-type grounding electrode is 45°-60°, the number of the claw-type grounding electrodes is 4, the length of the claw-type grounding electrode is 1-2m, the claw-type grounding electrode is arranged at the extended end of the grounding wire, the four horizontal grounding wires are surrounded by grounding reinforcement materials, and the rectangular frame formed by the four claw-type grounding electrodes near the four tower bases is surrounded by grounding reinforcement materials.

[0016] When the tower is in an area where the soil resistivity is above 2000 ohm-meter, the inclination of the claw-type grounding electrode is 60°, the number of the claw-type grounding electrodes is 4, the length of the claw-type grounding electrode is greater than 2m, the claw-type grounding electrode is arranged at the extended end of the grounding wire, the four horizontal grounding wires are surrounded by grounding reinforcement materials, and the rectangular frames near the four tower bases are surrounded by grounding reinforcement materials.

[0017] Furthermore, the claw-shaped grounding electrode and the grounding wire are made of copper-clad steel material, and a tin layer is hot-dipped on the surface of the copper-clad steel material.

[0018] The beneficial effects of the present invention are: according to the soil resistivity, the angle, length and number of the claw-type grounding electrode are reasonably adjusted, and when the soil resistivity reaches the highest, the grounding reinforcement material and the electrolytic ion grounding electrode are appropriately added to make it easier to reduce the soil resistivity. The grounding electrode is made of copper-clad steel material, the composite surface layer is tin, which is resistant to oxidation and does not affect the cathodic protection, and the inner layer is oxygen-free copper, which has excellent anti-corrosion and conductive properties. While reducing the difficulty of laying, it also enhances the grounding effect of the tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the tower grounding device of the present invention when the soil resistivity is less than 100 ohm-meter;

[0020] Figure 2 It is a structural schematic diagram of the tower grounding device of the present invention when the soil resistivity is 100 to 200 ohm-meter;

[0021] Figure 3 It is a schematic structural diagram of the tower grounding device of the present invention when the soil resistivity is 200 to 500 ohm-meter;

[0022] Figure 4 It is a structural schematic diagram of the tower grounding device of the present invention when the soil resistivity is 500 to 1000 ohm-meter;

[0023] Figure 5 It is a structural schematic diagram of the tower grounding device of the present invention when the soil resistivity is 1000 to 2000 ohm-meters;

[0024] Figure 6 It is a schematic diagram of the structure of the tower grounding device of the present invention when the soil resistivity is above 2000 ohm-meter;

[0025] In the figure, 1-tower base, 2-vertical grounding electrode, 3-grounding wire, 4-grounding reinforcement material, 5-electrolytic ion grounding electrode. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0027] A pole tower grounding device, the pole tower has four tower bases 1 arranged in a quadrilateral to form a quadrilateral area, the pole tower grounding device comprises a plurality of vertical grounding electrodes 2 and grounding wires 3, the grounding wires 3 are respectively extended outwards from the tower bases 1 of the pole tower in the form of rays;

[0028] See also Figure 1 When the tower is in an area where the soil resistivity is less than 100 ohm-meter, the inclination of the claw-type grounding electrode 2 is 30°, the length of the claw-type grounding electrode is between 0m-1m, the number of the claw-type grounding electrodes 2 is 0 or 1, and the claw-type grounding electrode is arranged at the extended end of the grounding wire 3.

[0029] See also Figure 2 When the tower is in an area where the soil resistivity is 100-200 ohm-meter, the inclination of the claw-type grounding electrode 2 is 30°, the length of the claw-type grounding electrode is between 0m-1m, the number of the claw-type grounding electrodes 2 is 1, and the claw-type grounding electrode is arranged at the extended end of the horizontal grounding line 3.

[0030] See also Figure 3When the pole tower is in an area with a soil resistivity of 200-500 ohm-meter, the inclination of the claw-type grounding electrode 2 is 30°-45°, the length of the claw-type grounding electrode 2 is between 0m-1m, the number of the claw-type grounding electrodes 2 is 1-2, and the claw-type grounding electrode 2 is arranged at the extended end diagonally or on the same side of the grounding wire 3.

[0031] See also Figure 4 When the tower is in an area where the soil resistivity is 500 to 1000 ohm-meter, the inclination of the claw-type grounding electrode 2 is 30°-45°, the number of the claw-type grounding electrodes 2 is 2-3, the length of the claw-type grounding electrode 2 is 1-2m, and the claw-type grounding electrode is arranged at the extended end of the grounding wire 3.

[0032] See also Figure 5 When the tower is in an area where the soil resistivity is 1000-2000 ohm-meter, the inclination of the claw-type grounding electrode 2 is 45°-60°, the number of the claw-type grounding electrodes 2 is 4, the length of the claw-type grounding electrode 2 is 1-2m, the claw-type grounding electrode 2 is arranged at the extended end of the grounding wire, the four horizontal grounding wires are surrounded by grounding reinforcement material 4, and the rectangular frame formed by the four claw-type grounding electrodes 2 near the four tower bases is surrounded by grounding reinforcement material 4.

[0033] See also Figure 6 When the tower is in an area where the soil resistivity is above 2000 ohm-meter, the inclination of the claw-type grounding electrode 2 is 60°, the number of the claw-type grounding electrodes 2 is 4, the length of the claw-type grounding electrode 2 is greater than 2m, the claw-type grounding electrode 2 is arranged at the extended end of the grounding wire 3, the four horizontal grounding wires 3 are surrounded by grounding reinforcement materials 4, and the rectangular frames near the four tower bases are surrounded by grounding reinforcement materials 4.

[0034] Furthermore, the claw-shaped grounding electrode and the grounding wire are made of copper-clad steel material, and a tin layer is hot-dipped on the surface of the copper-clad steel material.

[0035] Specifically, the claw-shaped grounding electrode 2 and the grounding wire 3 are made of copper-clad steel material, and a tin layer is hot-dipped on the surface of the copper-clad steel material.

[0036] The present invention reasonably adjusts the number, angle and length of the claw-type grounding level 2 according to the soil resistivity, and appropriately adds the grounding reinforcement material 4 and the electrolytic ion grounding electrode 5 when the soil resistivity reaches the highest, so that it is easier to reduce the soil resistivity. Among them, the claw-type grounding electrode 3 is made of copper-clad steel material, the composite surface layer is tin, which is anti-oxidation and does not affect the cathode protection, and the inner layer is oxygen-free copper, which has excellent anti-corrosion and electrical conductivity. Hot-dip tin is performed on the surface of the copper-clad steel, and the surface tin layer reduces its electrode potential relative to steel and zinc, and can eliminate its electrode potential relative to lead. Effectively prevent the tower grounding device from being corroded.

[0037] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, such as the number of connections and the grounding electrode material, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A combined grounding device consisting of a tower foundation and a claw-type grounding body, used to reduce the lightning impulse grounding resistance value of the grounding device, characterized in that: include: Horizontal ground wire; Claw type grounding electrode.

2. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 1, characterized in that: There are four horizontal grounding wires, each extending outward at 45° along the tower base of the tower, and a claw-type grounding electrode is arranged at the extended end of the horizontal grounding wire.

3. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 1, characterized in that: When the tower is in an area where the soil resistivity is less than 100 ohm-meter, the claw-type grounding electrode is connected to the single end of the horizontal grounding wire, the number is 0-1, the length of the claw-type grounding electrode is between 0-1 meter, and the inclination of the claw-type grounding electrode is 30°.

4. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 1, characterized in that: When the tower is in an area with a soil resistivity of 100-200 ohm-meter, the claw-type grounding electrode is connected to the single end of the horizontal grounding wire. There is one claw-type grounding electrode, the length of which is between 0-1 meter, and the inclination of which is 30°.

5. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 1, characterized in that: When the pole tower is in an area with a soil resistivity of 200-500 ohm-meter, the claw-type grounding electrode is connected to the diagonal or same-side end of the horizontal grounding line, with 1-2 claw-type grounding electrodes, the length of which is between 0-1 meter, and the inclination of which is 30°-45°.

6. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 1, characterized in that: When the pole tower is in an area with a soil resistivity of 500-1000 ohm-meter, the claw-type grounding electrode is connected to the diagonal or same-side end of the horizontal grounding line, with 2-3 claw-type grounding electrodes, the length of which is between 1-2 meters, and the inclination of which is 30°-45°.

7. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 1, characterized in that: When the pole tower is in an area with a soil resistivity of 1000-2000 ohm-meter, the claw-type grounding electrode is connected to the ends of all horizontal grounding wires, and the number is 4. The length of the claw-type grounding electrode is between 1-2 meters, and the inclination of the claw-type grounding electrode is 45°-60°. The length of the claw-type grounding electrode is greater than 2 meters, and the inclination of the claw-type grounding electrode is 60°.

8. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 1, characterized in that: When the tower is located in an area where the soil resistivity is above 2000 ohm-meter, the claw-type grounding electrodes are connected to the ends of all horizontal grounding wires, and the number is 4.

9. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 8, characterized in that: Grounding reinforcement materials are applied around the four claw-shaped grounding wires, and grounding reinforcement materials are applied around the rectangular frames near the four tower bases.

10. The combined grounding device consisting of a tower foundation and a claw-type grounding body according to claim 1, characterized in that: The claw-shaped grounding electrode and the horizontal grounding wire are made of copper-clad steel material, and a tin layer is hot-dipped on the surface of the copper-clad steel material.

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