Electric power engineering grounding pile structure

Abstract

The embodiment of the invention provides an electric power engineering grounding pile structure, and relates to the technical field of electric power engineering. The electric power engineering grounding pile structure comprises a grounding pile body, a conductive enhancement assembly and an adjustable impedance matching unit. The wire reinforcing assembly is arranged in the ground pile body, and the adjustable impedance matching unit is arranged on the upper portion of the ground pile body and connected with the wire reinforcing assembly. According to the conductive enhancing assembly, through the synergistic effect of the multiple layers of conductive tubes and the nanometer conductive gel, the current conduction efficiency is remarkably improved, and the grounding resistance in high-resistivity soil is stabilized to be 3 omega-4 omega or below and is reduced by about 30%-40% compared with a traditional single metal pile.

Description

Technical Field

[0001] The invention relates to the technical field of electric power engineering, and in particular to an electric power engineering grounding pile structure. Background Art

[0002] In the field of power engineering, the grounding system is a key technology to ensure the safety of equipment operation and personal protection, and one of its core components is the grounding pile. The main function of the grounding pile is to quickly conduct fault current, lightning impulse current or other abnormal current into the earth to maintain the potential stability of the system, prevent overvoltage from damaging the equipment, and reduce the risk of electric shock. As modern power systems develop towards high voltage, large capacity and distributed energy, grounding piles need to cope with increasingly complex operating environments and higher performance requirements.

[0003] Traditional grounding pile designs mostly use a single metal rod or a simple multi-section connection structure, usually made of steel, copper or galvanized materials, and rely on direct insertion into the soil to achieve the grounding function. However, this design exposes a series of limitations in practical applications. First, in high-resistivity soils (such as sandy soils, frozen soils or rock layers), the grounding resistance of traditional grounding piles is often too high to meet modern power grid standards (such as the requirement that the grounding resistance is less than 4Ω). Secondly, under high-frequency lightning strikes, due to surface effects and impedance mismatch, the current diffusion efficiency is reduced, and reflected waves may cause secondary damage to the equipment. In addition, long-term exposure to humid, saline or acidic soil environments makes traditional grounding piles prone to corrosion, resulting in reduced conductivity and even structural failure, and their service life is significantly limited.

[0004] To improve the above problems, technicians have tried to improve performance by increasing the surface area of ​​grounding piles, using conductive fillers, or improving the corrosion resistance of materials. For example, some designs coat the surface of the pile with a conductive layer to enhance the current diffusion capacity, or use multiple grounding piles in parallel to reduce the total resistance. However, these methods have limited effects under complex geological conditions, and the manufacturing and installation costs are high. In addition, with the increase in the demand for lightning protection, dynamic impedance matching under high-frequency impacts has become a new technical difficulty. Traditional grounding piles lack adaptive adjustment capabilities and are difficult to effectively cope with current impacts of different frequencies and amplitudes. Summary of the invention

[0005] According to an embodiment of the present invention, a power engineering grounding pile structure is provided to solve the problems raised by the above background technology.

[0006] In a first aspect of the present invention, a power engineering grounding pile structure is provided.

[0007] The electric power engineering grounding pile structure comprises: a ground pile body, a conductive reinforcement component and an adjustable impedance matching unit; the conductive reinforcement component is arranged inside the ground pile body, and the adjustable impedance matching unit is arranged on the upper part of the ground pile body and connected to the conductive reinforcement component.

[0008] Preferably, the conductive enhancement component comprises a copper-based alloy tube, an aluminum-based alloy tube and a silver-based alloy tube; the copper-based alloy tube is arranged inside the ground pile body, and a first insulating bracket is arranged between the outer wall of the copper-based alloy tube and the inner wall of the ground pile body; the aluminum-based alloy tube is arranged inside the copper-based alloy tube, and a second insulating bracket is arranged between the outer wall of the aluminum-based alloy tube and the inner wall of the copper-based alloy tube; the silver-based alloy tube is arranged inside the aluminum-based alloy tube, and a third insulating bracket is arranged between the outer wall of the silver-based alloy tube and the inner wall of the aluminum-based alloy tube; and the gaps among the copper-based alloy tube, the aluminum-based alloy tube, the silver-based alloy tube and the ground pile body are filled with nano conductive gel.

[0009] Preferably, the adjustable impedance matching unit includes a conductor, a plurality of impedance units, a conductive joint and a driving mechanism, the conductor is connected to the conductive enhancement component, a plurality of the impedance units are arranged on the conductor, the plurality of the impedance units are in a ring array, the conductive joint is rotatably installed between the plurality of the impedance units, and the driving mechanism is connected to the conductive joint for driving the conductive joint to rotate.

[0010] Preferably, it further comprises a shell, which is arranged outside the conductor, the impedance unit and the conductive joint.

[0011] Preferably, the lower surface of the conductor is provided with:

[0012] a first conductive portion connected to the silver-based alloy tube;

[0013] A second conductive portion connected to the aluminum-based alloy tube;

[0014] A third conductive portion connected to the copper-based alloy tube.

[0015] Preferably, the bottom of the ground pile body is conical.

[0016] Preferably, two stabilizing components are further included, and the two stabilizing components are respectively fixedly connected to the ground pile body.

[0017] Preferably, the stabilizing assembly includes a mounting shell, an adjusting screw, a mounting block, two limit rods and two supporting bodies; the mounting shell is fixedly connected to the ground pile body, the adjusting screw extends deeply into the interior of the mounting shell, the adjusting screw passes through the mounting block and is threadedly connected to the mounting block, the side wall of the mounting shell is provided with a notch for the supporting body to extend out, the two limit rods are arranged at the notch, the two supporting bodies are provided with a sliding groove, the limit rod passes through the sliding groove, one end of the two limit rods located inside the mounting shell is rotatably connected to the mounting block, and the two limit rods are inclined upward at one end away from the mounting block.

[0018] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0019] The present invention provides a grounding pile structure for power engineering. The conductive enhancement component significantly improves the current conduction efficiency through the synergistic effect of multi-layer conductive tubes (copper-based alloy tubes, aluminum-based alloy tubes and silver-based alloy tubes) and nano-conductive gel. The grounding resistance in high-resistivity soil (resistivity 1000Ω·m) is stabilized at below 3Ω-4Ω, which is about 30%-40% lower than that of traditional single metal piles. Secondly, the dynamic adjustment function of the adjustable impedance matching unit optimizes the impedance matching under high-frequency lightning impact. In the 10kA, 8 / 20μs lightning wave test, the reflected wave amplitude is reduced to 25%-30% of the traditional design, effectively protecting the equipment from overvoltage damage. In addition, the ground pile body is made of titanium alloy, combined with the design of the outer wall guide groove and the conical puncture head, which enhances the structural strength and soil contact efficiency, improves the installation adaptability by about 20%, and the corrosion resistance extends the service life to more than 20 years. In summary, this structure has significant advantages in conductivity, impedance stability and environmental adaptability, and is suitable for various power engineering scenarios such as high-voltage transmission, substations and distributed energy systems.

[0020] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, advantages and aspects of the embodiments of the present invention will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a power engineering grounding pile structure according to an embodiment of the present invention is shown;

[0023] Figure 2A schematic diagram of an exploded structure of a power engineering grounding pile structure according to an embodiment of the present invention is shown;

[0024] Figure 3 A schematic cross-sectional view of a conductive reinforcement assembly of a grounding pile structure for a power engineering project according to an embodiment of the present invention is shown;

[0025] Figure 4 A schematic diagram of the three-dimensional structure of a conductive reinforcement component of a power engineering grounding pile structure according to an embodiment of the present invention is shown;

[0026] Figure 5 A schematic diagram of the three-dimensional structure of an impedance matching unit of a power engineering grounding pile structure according to an embodiment of the present invention is shown;

[0027] Figure 6 A cross-sectional structural schematic diagram of a stabilizing component of a power engineering grounding pile structure according to an embodiment of the present invention is shown.

[0028] Description of Reference Numerals

[0029] 1-ground pile body, 2-conductive reinforcement component, 21-copper-based alloy tube, 22-aluminum-based alloy tube, 23-silver-based alloy tube, 24-first insulating bracket, 25-second insulating bracket, 26-third insulating bracket, 3-impedance matching unit, 31-conductor, 311-first conductive part, 312-second conductive part, 313-third conductive part, 32-impedance unit, 33-conductive joint, 34-driving mechanism, 35-shell, 4-stabilizing component, 41-mounting shell, 42-adjusting screw, 43-mounting block, 44-limiting rod, 45-support body, 451-slide groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] like Figures 1 to 6As shown, in this embodiment, the power engineering grounding pile structure includes: a ground pile body 1, a conductive enhancement component 2 and an adjustable impedance matching unit 3; the conductive enhancement component 2 is arranged inside the ground pile body 1, and the adjustable impedance matching unit 3 is arranged on the upper part of the ground pile body 1 and connected to the conductive enhancement component 2. The ground pile body 1 is made of titanium alloy, and its outer wall is provided with a spiral guide groove along the longitudinal direction, and the groove is filled with graphite-based conductive filler, and a conical piercing head with a cone angle of 30° is provided at the lower end. The adjustable impedance matching unit 3 is electrically connected to the conductive enhancement component 2 through a shielded cable.

[0033] In this embodiment, the conductive enhancement component 2 includes a copper-based alloy tube 21, an aluminum-based alloy tube 22 and a silver-based alloy tube 23; the copper-based alloy tube 21 is arranged inside the ground pile body 1, and a first insulating bracket 24 is arranged between the outer wall of the copper-based alloy tube 21 and the inner wall of the ground pile body 1; the aluminum-based alloy tube 22 is arranged inside the copper-based alloy tube 21, and a second insulating bracket 25 is arranged between the outer wall of the aluminum-based alloy tube 22 and the inner wall of the copper-based alloy tube 21; the silver-based alloy tube 23 is arranged inside the aluminum-based alloy tube 22, and a third insulating bracket 26 is arranged between the outer wall of the silver-based alloy tube 23 and the inner wall of the aluminum-based alloy tube 22; the gaps between the copper-based alloy tube 21, the aluminum-based alloy tube 22, the silver-based alloy tube 23 and the ground pile body 1 are filled with nano conductive gel. The copper-based alloy tube 21 is made of copper-nickel alloy (nickel content 10wt%), and the conductivity is 5.8×10 7 The aluminum-based alloy tube 22 is made of aluminum-magnesium alloy (magnesium content 5wt%), and the conductivity is 3.5×10 7 The silver-based alloy tube 23 is made of silver-copper alloy (copper content 2wt%), and the conductivity is 6.3×10 7 S / m. The first insulating support 24, the second insulating support 25 and the third insulating support 26 are all made of polytetrafluoroethylene to ensure the coaxial positioning and electrical insulation of each conductive tube. The nano conductive gel is based on polydimethylsiloxane, doped with 5wt% carbon nanotubes and 3wt% zinc oxide particles, and has a conductivity of 10 5 S / m, filled into the gap by high pressure injection, with a thickness of 6mm-8mm.

[0034] When in use, the actual working principle of the power engineering grounding pile structure is as follows: external current (such as fault current or lightning impulse current) enters the system through the connecting flange connected to the upper end of the ground pile body 1. The connecting flange is fixedly connected to the external copper core grounding wire by M8 bolts, and the current first flows into the adjustable impedance matching unit 3. The impedance regulator of the adjustable impedance matching unit 3 adjusts the equivalent impedance (range 0.5Ω-8Ω) according to the current characteristics (such as frequency and amplitude) through a micro solenoid valve. At the same time, the dynamic capacitance module adjusts the capacitance value (range 15nF-90nF) through a parallel ceramic capacitor to match the frequency characteristics of the lightning impulse wave (10kHz-1MHz), thereby reducing the secondary damage of the reflected wave to the equipment. The current flows along the copper-based alloy tube 21 (conductivity 5.8×10 7 S / m), aluminum-based alloy tube 22 (conductivity 3.5×10 7 S / m) and silver-based alloy tube 23 (conductivity 6.3×10 7 S / m) longitudinal transmission, wherein the high-frequency current is mainly quickly conducted by the silver-based alloy tube 23, and the low-frequency current is shared by the copper-based alloy tube 21 and the aluminum-based alloy tube 22. The first insulating bracket 24, the second insulating bracket 25 and the third insulating bracket 26 isolate the conductive tubes to prevent short circuits. At the same time, the nano-conductive gel is filled in the gaps, and the conductive network formed by the carbon nanotubes and zinc oxide particles enhances the lateral current diffusion. Finally, the current is efficiently introduced into the soil through the spiral guide groove (depth 4mm, embedded with graphite-based fillers) on the outer wall of the pile body 1 and the conical puncture head at the lower end to complete the grounding process.

[0035] First, the conductive enhancement component 2 significantly improves the current conduction efficiency through the synergistic effect of multi-layer conductive tubes (copper-based alloy tubes 21, aluminum-based alloy tubes 22 and silver-based alloy tubes 23) and nano-conductive gel, and the grounding resistance in high-resistivity soil (resistivity 1000Ω·m) is stabilized at below 3Ω-4Ω, which is about 30%-40% lower than that of traditional single metal piles. Secondly, the dynamic adjustment function of the adjustable impedance matching unit 3 optimizes the impedance matching under high-frequency lightning impact. In the 10kA, 8 / 20μs lightning wave test, the reflected wave amplitude is reduced to 25%-30% of the traditional design, effectively protecting the equipment from overvoltage damage. In addition, the ground pile body 1 is made of titanium alloy, combined with the design of the outer wall guide groove and the conical puncture head, which enhances the structural strength and soil contact efficiency, improves the installation adaptability by about 20%, and the corrosion resistance extends the service life to more than 20 years. In summary, this structure has significant advantages in conductivity, impedance stability and environmental adaptability, and is suitable for various power engineering scenarios such as high-voltage transmission, substations and distributed energy systems.

[0036] In this embodiment, the adjustable impedance matching unit 3 includes a conductor 31, a plurality of impedance units 32, a conductive joint 33 and a driving mechanism 34. The conductor 31 is connected to the conductive enhancement component 2. The plurality of impedance units 32 are arranged on the conductor 31. The plurality of impedance units 32 are in a ring array. The conductive joint 33 is rotatably installed between the plurality of impedance units 32. The driving mechanism 34 is connected to the conductive joint 33 and is used to drive the conductive joint 33 to rotate. The conductor 31 is made of high-purity copper (conductivity 5.9×10 7 S / m), in the shape of a disc, and fixed to the connecting flange of the ground pile body 1 by M8 bolts. A total of 6 impedance units 32 are arranged, each unit includes a metal film resistor (resistance range 0.5Ω-5Ω, power 2W) and a ceramic capacitor (capacitance value 5nF-15nF, withstand voltage 500V) connected in parallel, which are evenly distributed in a ring shape along the upper surface of the conductor 31. The conductive connector 33 is a copper rotating arm, which is rotatably mounted on the conductor 31 through a central axis (made of stainless steel), and its contact end is embedded with a silver alloy contact, which is in sliding contact with the conductive end of the impedance unit 32. The driving mechanism 34 includes a micro stepping motor (power 10W) ​​and a controller (based on ARM Cortex-M3), which is connected to the central axis of the conductive connector 33 through gear transmission to drive it to rotate.

[0037] In this embodiment, a housing 35 is also included, and the housing 35 is arranged outside the conductor 31, the impedance unit 32 and the conductive connector 33. The housing 35 is made of aluminum alloy, and the surface is anodized, and the protection level is IP67. The bottom of the housing 35 is fixed to the connecting flange of the ground pile body 1 by bolts, and an M12 waterproof connector is provided on the top for external grounding wire access. The interior of the housing 35 is filled with a silicone sealing pad to ensure waterproof and dustproof performance.

[0038] In this embodiment, the lower surface of the conductor 31 is provided with: a first conductive portion 311 connected to the silver-based alloy tube 23; a second conductive portion 312 connected to the aluminum-based alloy tube 22; and a third conductive portion 313 connected to the copper-based alloy tube 21. The first conductive portion 311, the second conductive portion 312, and the third conductive portion 313 are all copper bosses, each of which is connected to the copper-based alloy tube 21 by a wire with a diameter of 2 mm. 2 The shielded cable is welded and connected to the silver-based alloy tube 23, the aluminum-based alloy tube 22 and the copper-based alloy tube 21, and the cable passes through the reserved channel on the upper part of the pile body 1.

[0039] In this embodiment, the bottom of the pile body 1 is conical. The conical bottom is integrally formed with titanium alloy, and its outer surface is connected to the lower end of the copper-based alloy tube 21 by welding to ensure efficient conduction of current to the soil.

[0040] In this embodiment, the bottom of the ground pile body 1 is conical.

[0041] In this embodiment, two stabilizing components 4 are further included, and the two stabilizing components 4 are respectively fixedly connected to the ground pile body 1 .

[0042] In this embodiment, the stabilizing assembly 4 includes a mounting shell 41, an adjusting screw 42, a mounting block 43, two limiting rods 44 and two supporting bodies 45; the mounting shell 41 is fixedly connected to the ground pile body 1, the adjusting screw 42 extends deeply into the interior of the mounting shell 41, the adjusting screw 42 passes through the mounting block 43 and is threadedly connected to the mounting block 43, the side wall of the mounting shell 41 is provided with a notch for the supporting body 45 to extend out, the two limiting rods 44 are arranged at the notch, the two supporting bodies 45 are provided with a slide groove 451, the limiting rods 44 pass through the slide groove 451, one end of the two limiting rods 44 located inside the mounting shell 41 is rotatably connected to the mounting block 43, and one end of the two limiting rods 44 away from the mounting block 43 is tilted upward. The mounting shell 41 is made of stainless steel and is fixedly connected to the outer wall of the ground pile body 1 by welding to ensure a stable structure. The adjusting screw 42 is made of high-strength steel, and its surface is treated with rust prevention. Its thread matches the threaded hole inside the mounting block 43. The mounting block 43 is made of cast iron, and a rotating hinge for connecting with the limit rod 44 is provided on the surface. The limit rod 44 and the support body 45 are both made of stainless steel. The outer end of the support body 45 is sharp, which is convenient for inserting into the soil. The inner wall of the slide groove 451 is coated with a lubricating coating to reduce friction resistance.

[0043] When in use, after the stabilizing assembly 4 is inserted into the soil along with the pile body 1, the adjusting screw 42 is rotated manually or with a tool. The rotation of the adjusting screw 42 drives the mounting block 43 to move upward along the thread direction, and the mounting block 43 pushes the two limiting rods 44 to move by rotating the hinge. Since the limiting rod 44 passes through the slide groove 451 on the support body 45, and the end of the limiting rod 44 away from the mounting block 43 is tilted upward, the movement of the limiting rod 44 causes the support body 45 to slide outward along the guide of the slide groove 451, and extend through the notch of the side wall of the mounting shell 41, and further insert into the soil. The sharp outer end of the support body 45 penetrates into the soil to form an additional anchor point, thereby enhancing the stability of the pile body 1 in the soil and preventing tilting or pulling out due to external forces (such as wind or loose soil).

[0044] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A grounding pile structure for electric power engineering, characterized in that: include: A ground pile body (1), a conductive reinforcement component (2) and an adjustable impedance matching unit (3); the conductive reinforcement component (2) is arranged inside the ground pile body (1), and the adjustable impedance matching unit (3) is arranged on the upper part of the ground pile body (1) and connected to the conductive reinforcement component (2).

2. The electric power engineering grounding pile structure according to claim 1, characterized in that: The conductive enhancement component (2) comprises a copper-based alloy tube (21), an aluminum-based alloy tube (22) and a silver-based alloy tube (23); the copper-based alloy tube (21) is arranged inside the ground pile body (1), and a first insulating bracket (24) is arranged between the outer wall of the copper-based alloy tube (21) and the inner wall of the ground pile body (1); the aluminum-based alloy tube (22) is arranged inside the copper-based alloy tube (21), and a second insulating bracket (25) is arranged between the outer wall of the aluminum-based alloy tube (22) and the inner wall of the copper-based alloy tube (21); the silver-based alloy tube (23) is arranged inside the aluminum-based alloy tube (22), and a third insulating bracket (26) is arranged between the outer wall of the silver-based alloy tube (23) and the inner wall of the aluminum-based alloy tube (22); and the gaps between the copper-based alloy tube (21), the aluminum-based alloy tube (22), the silver-based alloy tube (23) and the ground pile body (1) are filled with nano conductive gel.

3. The electric power engineering grounding pile structure according to claim 2, characterized in that: The adjustable impedance matching unit (3) comprises a conductor (31), a plurality of impedance units (32), a conductive joint (33) and a driving mechanism (34); the conductor (31) is connected to the conductive enhancement component (2); the plurality of impedance units (32) are arranged on the conductor (31); the plurality of impedance units (32) are in a ring array; the conductive joint (33) is rotatably mounted between the plurality of impedance units (32); and the driving mechanism (34) is connected to the conductive joint (33) and is used to drive the conductive joint (33) to rotate.

4. The electric power engineering grounding pile structure according to claim 3, characterized in that: It also includes a shell (35), which is arranged outside the conductor (31), the impedance unit (32) and the conductive joint (33).

5. The electric power engineering grounding pile structure according to claim 3, characterized in that: The lower surface of the conductor (31) is provided with: a first conductive portion (311) connected to the silver-based alloy tube (21); a second conductive portion (312) connected to the aluminum-based alloy tube (22); A third conductive portion (313) connected to the copper-based alloy tube (21).

6. The electric power engineering grounding pile structure according to claim 1, characterized in that: The bottom of the ground pile body (1) is conical.

7. The electric power engineering grounding pile structure according to claim 1, characterized in that: It also comprises two stabilizing components (4), wherein the two stabilizing components (4) are respectively fixedly connected to the ground pile body (1).

8. The electric power engineering grounding pile structure according to claim 7, characterized in that: The stabilizing component (4) comprises a mounting shell (41), an adjusting screw (42), a mounting block (43), two limiting rods (44) and two supporting bodies (45); the mounting shell (41) is fixedly connected to the ground pile body (1); the adjusting screw (42) extends deeply into the interior of the mounting shell (41); the adjusting screw (42) passes through the mounting block (43) and is threadedly connected to the mounting block (43); a notch is provided on the side wall of the mounting shell (41) for the supporting bodies (45) to extend out; the two limiting rods (44) are arranged at the notch; the two supporting bodies (45) are provided with a sliding groove (451); the limiting rods (44) pass through the sliding groove (451); one end of the two limiting rods (44) located inside the mounting shell (41) is rotatably connected to the mounting block (43); and one end of the two limiting rods (44) away from the mounting block (43) is inclined upward.

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