Carbon fiber composite complete grounding device

Abstract

The utility model discloses a carbon fiber composite complete grounding device, comprising a grounding down lead, a carbon fiber composite graphite blanket, carbon fiber composite graphite belts, a connector and a grounding module, and the connector is used for connection between the carbon fiber composite graphite belts and connection between the carbon fiber composite graphite belts and the grounding down lead. According to the utility model, through the combination of the carbon fiber composite graphite belt / blanket and the grounding module, a multi-dimensional conductive network is formed by using the high conductivity of the carbon fiber and the excellent ion conductivity of the graphite, so that the diffusion efficiency is effectively improved. Moreover, the grounding module can be quickly connected with the graphite belt through the movable hammer head, is convenient to construct, and is particularly suitable for high-soil resistivity regions.

Description

Technical Field

[0001] This utility model relates to the field of power equipment grounding technology, specifically to a carbon fiber composite grounding device. Background Technology

[0002] The grounding system of power transmission and transformation involves many disciplines. Compared with other electrical technologies, due to the complexity of the environment and system, grounding technology research involves multiple disciplines and their intersections, including geology, soil science, chemistry, materials science, and electrical engineering. Therefore, related research encompasses a wide range of content, possessing not only strong engineering application value but also significant theoretical importance. However, the extensive research on grounding of electrical equipment has led to the complexity and variability of grounding research. Different application scenarios, such as confined areas, narrow areas, highly corrosive regions, mountainous areas, farmland, coastal areas, and high-humidity, high-temperature terrain, require different grounding solutions. In particular, the high altitude, high soil resistivity, and highly corrosive soil of Tibet, along with its complex and diverse terrain and distinct soil stratification, result in high grounding project costs, insignificant resistance reduction effects, and difficulty in meeting equipment operation requirements. Furthermore, the design and installation of grounding devices cannot be standardized, leading to cumbersome project acceptance processes.

[0003] Traditional grounding designs are often limited to horizontal grounding. In areas where grounding resistance is difficult to reduce, increasing the length of radial grounding electrodes is commonly used. However, increasing the length of radial grounding electrodes only has a limited effect on reducing power frequency grounding resistance. It creates a strong inductive effect for high-frequency lightning impulse currents, hindering their propagation along the horizontal grounding electrodes. Studies show that when the length of the horizontal grounding electrode exceeds 100m, further increasing the length does not reduce the impulse grounding impedance. Single grounding materials, such as galvanized steel, grounding modules, copper-clad steel, and graphite-based flexible grounding electrodes, struggle to simultaneously address issues like corrosion, construction difficulties, challenges in reducing resistance in high soil resistivity, difficulties in excavation-restricted construction, and high project costs. To address these problems with single grounding materials, many existing technologies combine individual grounding materials to form complete grounding systems, such as the complete grounding system described in Reference 1.

[0004] Reference 1: Chinese patent document with publication number CN216872276U

[0005] Reference 1 describes a complete grounding device, which includes a junction box and several grounding elements. The grounding elements are detachably connected through the junction box. The junction box has a channel that runs through it, and a pressure plate is provided inside the channel. Each grounding element has a connecting end that is inserted into the channel. Two connecting ends to be connected are respectively inserted into the channel. When two connecting ends are connected, the pressure plate presses them together. When two connecting ends are disassembled, the pressure plate loosens them. The grounding elements in the complete grounding device can be quickly assembled and their layout can be quickly changed, offering advantages such as flexible layout and ease of operation. Utility Model Content

[0006] The purpose of this utility model is to enrich the technical routes of complete grounding devices and provide a carbon fiber composite complete grounding device.

[0007] To address the shortcomings of the aforementioned technical problems, the present invention adopts the following technical solution: a complete set of carbon fiber composite grounding devices, comprising a grounding lead, a carbon fiber composite graphite blanket, a carbon fiber composite graphite strip, a connector, and a grounding module. The connector is used for connecting the carbon fiber composite graphite strips and for connecting the carbon fiber composite graphite strips to the grounding lead.

[0008] The grounding down conductor includes a connector and a down conductor body. The connector is located at one end of the down conductor body and is used to connect to the transmission tower. The outer wall of the down conductor body is provided with a graphene coating and an epoxy resin coating from the inside to the outside.

[0009] Both the carbon fiber composite carpet and the carbon fiber composite graphite tape are woven from carbon fiber graphite threads, and the width and thickness of the carbon fiber composite carpet are greater than those of the carbon fiber composite graphite tape.

[0010] The grounding module includes a grounding rod and a movable hammer. One end of the grounding rod is a grounding tip, and the other end is equipped with a fixed hammer. The movable hammer is detachably connected to the fixed hammer. The movable hammer is made of copper and includes a first threading channel and a second threading channel arranged side by side. Both the first threading channel and the second threading channel are flat holes.

[0011] As a further optimization of the carbon fiber composite grounding device of this utility model: the carbon fiber graphite wire is made by twisting narrow strips of carbon fiber graphite composite film into a wire, and the carbon fiber graphite composite film is made of expanded graphite and carbon fiber composite.

[0012] As a further optimization of the carbon fiber composite grounding device of this utility model: the upper inner wall and / or lower inner wall of the channel are uniformly provided with several protrusions.

[0013] As a further optimization of the carbon fiber composite grounding device of this utility model: the upper inner wall and the lower inner wall of the channel are provided with protrusions. The top contour of the protrusion is a smoothly transitioned curved surface with a maximum radius of curvature of not less than 0.5mm. The circumferential edge of the protrusion is connected to the inner wall surface through a gradual curvature to form a continuous surface without sharp edges.

[0014] As a further optimization of the carbon fiber composite grounding device of this utility model: the upper inner wall of the channel is provided with spike-like protrusions.

[0015] As a further optimization of the carbon fiber composite grounding device of this utility model: the upper end face of the fixed hammer head is provided with a fixing hole with internal thread, and the lower end face of the movable hammer head is provided with a fixing post that can be screwed into the fixing hole.

[0016] As a further optimization of the carbon fiber composite grounding device of this utility model: the upper end face of the fixed hammer head is provided with a groove, the lower end face of the movable hammer head is provided with a protrusion that can be placed in the groove, and the side wall of the groove is provided with several parallel transverse protrusions.

[0017] As a further optimization of the carbon fiber composite grounding device of this utility model: the cross-section of the convex strip is triangular, and the tips of the convex strips on the two side walls are arranged opposite each other.

[0018] As a further optimization of the carbon fiber composite grounding device of this utility model: the connector is a wedge-shaped non-metallic clamp.

[0019] As a further optimization of the carbon fiber composite grounding device of this utility model: the material of the movable hammer head is pure copper or oxygen-free copper.

[0020] This invention offers the following advantages: By combining carbon fiber composite graphite strip / blanket with a grounding module, it leverages the high conductivity of carbon fiber and the excellent ionic conductivity of graphite to form a multi-dimensional conductive network, effectively improving current dissipation efficiency. Furthermore, the grounding module can be quickly connected to the graphite strip via a movable hammer, facilitating construction and making it particularly suitable for areas with high soil resistivity. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the construction status of the complete grounding device of this utility model;

[0022] Figure 2 This is a schematic diagram of the graphite strip connected by a connector in the complete grounding device of this utility model;

[0023] Figure 3 This is a schematic diagram of the grounding module in the complete grounding device of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the fixed hammer and the movable hammer in the complete grounding device of this utility model. Figure I ;

[0025] Figure 5 This is a schematic diagram of the structure of the fixed hammer and the movable hammer in the complete grounding device of this utility model. Figure II ;

[0026] Figure 6 This is a schematic diagram of the structure of the fixed hammer and the movable hammer in the complete grounding device of this utility model. Figure III ;

[0027] Marked in the image:

[0028] 1. Grounding down conductor;

[0029] 2. Carbon fiber composite graphite blanket;

[0030] 3. Carbon fiber composite graphite tape;

[0031] 4. Connector;

[0032] 5. Grounding module;

[0033] 501. Grounding rod;

[0034] 5011, Sharp point reaching into the ground;

[0035] 5012. Fixed hammerhead;

[0036] 5013, Fixing hole;

[0037] 5014, Groove;

[0038] 5016, convex strip;

[0039] 502, movable hammerhead;

[0040] 5021, First threading channel;

[0041] 5022, Second Threading Channel;

[0042] 5023, Protrusion;

[0043] 5024. Fixed column;

[0044] 5025, bump. Detailed Implementation

[0045] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0046] like Figure 1 and 2The image shows a carbon fiber composite grounding device, comprising a grounding down conductor 1, a carbon fiber composite graphite blanket 2, a carbon fiber composite graphite strip 3, a connector 4, and a grounding module 5. The connector 4 is used for connecting the carbon fiber composite graphite strips 3 to each other and for connecting the carbon fiber composite graphite strips 3 to the grounding down conductor 1. The connector 4 is a wedge-shaped non-metallic clamp. It should be noted that the applicant's patented product (publication number CN206585082U) can be used.

[0047] The grounding down conductor 1 includes a connector and a down conductor body. The connector is located at one end of the down conductor body and is used to connect to the transmission tower. The outer wall of the down conductor body is coated with a graphene coating and an epoxy resin coating from the inside out. The down conductor body is made of high-purity annealed copper-clad steel stranded wire, and the copper-steel metallurgical bond is achieved through a cold drawing process, which combines high conductivity (DC resistance ≤0.39Ω / km at 20℃) and mechanical strength. Then, a three-dimensional graphene coating and an epoxy resin coating are deposited on the outer wall of the down conductor body.

[0048] Both the carbon fiber composite graphite blanket 2 and the carbon fiber composite graphite tape 3 are woven from carbon fiber graphite threads. The width and thickness of the carbon fiber composite graphite blanket 2 are greater than those of the carbon fiber composite graphite tape 3. The carbon fiber graphite threads are made by twisting narrow strips of carbon fiber graphite composite film into threads. The carbon fiber graphite composite film is made of expanded graphite and carbon fiber composite.

[0049] like Figure 3 As shown: The grounding module 5 includes a grounding rod 501 and a movable hammer head 502. One end of the grounding rod 501 is a grounding tip 5011, and the other end is provided with a fixed hammer head 5012. The movable hammer head 502 is detachably connected to the fixed hammer head 5012. The movable hammer head 502 is made of copper. The movable hammer head 502 includes a first threading channel 5021 and a second threading channel 5022 arranged side by side. Both the first threading channel 5021 and the second threading channel 5022 are flat holes.

[0050] During construction, the fixed hammer head 5012 is first hammered to insert one-third or half of the length of the grounding rod 501 into the soil at the grounding location. Then, the movable hammer head 502 is connected to the fixed hammer head 5012. The carbon fiber composite graphite strip 3 is first passed through the second threading channel 5022, then bent and passed through the first threading channel 5021. Finally, the movable hammer head 502 is hammered again. During the hammering process, because the movable hammer head 502 is made of copper (pure copper or oxygen-free copper), the first threading channel 5021 and the second threading channel 5022 deform during the hammering process, squeezing the graphite strip tightly. When the entire grounding module 5 is in the ground, the connection between the graphite strip and the grounding module 5 is completed.

[0051] To improve the compression effect of the first threading channel 5021 and the second threading channel 5022 on the graphite belt during deformation, a plurality of protrusions 5023 can be uniformly provided on the upper inner wall and / or lower inner wall of the first threading channel 5021 and the second threading channel 5022. The location and shape of the protrusions 5023 can be in the following two forms:

[0052] like Figure 4 As shown, in Form 1, both the upper and lower inner walls of the first threading channel 5021 and the second threading channel 5022 are provided with protrusions 5023. The top contour of the protrusion 5023 is a smoothly transitioning curved surface with a maximum radius of curvature of not less than 0.5mm. The circumferential edge of the protrusion 5023 is connected to the inner wall surface through a gradual curvature to form a continuous surface without sharp edges.

[0053] like Figure 5 As shown, in Form 2: the upper inner walls of the first threading channel 5021 and the second threading channel 5022 are provided with spike-like protrusions 5023.

[0054] There are many ways to connect the fixed hammer head 5012 and the movable hammer head 502. This embodiment provides the following two connection structures:

[0055] like Figure 4 and 5 As shown, in connection structure one: the upper end face of the fixed hammer head 5012 is provided with a fixing hole 5013, the fixing hole 5013 has an internal thread, and the lower end face of the movable hammer head 502 is provided with a fixing post 5024 that can be screwed into the fixing hole 5013.

[0056] like Figure 6 As shown, in connection structure two: the upper end face of the fixed hammer head 5012 is provided with a groove 5014, and the lower end face of the movable hammer head 502 is provided with a protrusion 5025 that can be inserted into the groove 5014. Several parallel transverse protrusions 5016 are provided on the sidewalls of the groove 5014. The cross-section of each protrusion 5016 is triangular, and the tips of the protrusions 5016 on two sidewalls are positioned opposite each other. During hammering, the copper protrusion 5025 deforms, expands outward circumferentially, and enters the gap between adjacent protrusions 5016, ultimately completing the fastening between the fixed hammer head 5012 and the movable hammer head 502.

[0057] This invention innovatively employs a technical solution combining carbon fiber composite graphite tape / blanket with a grounding module. Leveraging the high conductivity of carbon fiber and the excellent ionic conductivity of graphite, a multi-dimensional conductive network is constructed, enabling faster and more uniform current diffusion, thus significantly improving current dissipation efficiency. In practical applications, the movable hammer head equipped with the grounding module allows for rapid and stable connection with the graphite tape, greatly simplifying the construction process and shortening the construction cycle. This design is particularly suitable for areas with high soil resistivity, effectively reducing grounding resistance and ensuring the stable operation of electrical systems. It possesses both significant technical advantages and practical value. Field tests in the permafrost region of the Qinghai-Tibet Plateau showed that this combined system achieved a stable grounding resistance of <10Ω in 3500Ω·m high-resistivity soil. Under lightning current impulse (100kA, 8 / 20μs), the temperature rise was 62% lower than that of traditional copper cables. Furthermore, it exhibits resistance to frost heave (no cracking when bent at -40℃) and salt spray resistance (3000h corrosion weight loss <0.05%), improving construction efficiency by over 40%.

[0058] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this utility model.

Claims

1. A carbon fiber composite grounding device, characterized in that: It includes a grounding down conductor (1), a carbon fiber composite graphite blanket (2), a carbon fiber composite graphite strip (3), a connector (4), and a grounding module (5). The connector (4) is used for the connection between the carbon fiber composite graphite strips (3) and the connection between the carbon fiber composite graphite strips (3) and the grounding down conductor (1). The grounding down conductor (1) includes a connector and a down conductor body. The connector is located at one end of the down conductor body and is used to connect with the transmission tower. The outer wall of the down conductor body is provided with a graphene coating and an epoxy resin coating from the inside to the outside. The carbon fiber composite graphite blanket (2) and the carbon fiber composite graphite strip (3) are both woven from carbon fiber graphite threads. The width and thickness of the carbon fiber composite graphite blanket (2) are greater than those of the carbon fiber composite graphite strip (3). The grounding module (5) includes a grounding rod (501) and a movable hammer (502). One end of the grounding rod (501) is a grounding tip (5011), and the other end is provided with a fixed hammer (5012). The movable hammer (502) is detachably connected to the fixed hammer (5012). The movable hammer (502) is made of copper. The movable hammer (502) includes a first threading channel (5021) and a second threading channel (5022) arranged side by side. Both the first threading channel (5021) and the second threading channel (5022) are flat holes.

2. The carbon fiber composite grounding device as described in claim 1, characterized in that: The carbon fiber graphite wire is made by twisting narrow strips of carbon fiber graphite composite film into a wire, and the carbon fiber graphite composite film is made of expanded graphite and carbon fiber.

3. The carbon fiber composite grounding device as described in claim 2, characterized in that: The upper inner wall and / or lower inner wall of the first threading channel (5021) and the second threading channel (5022) are uniformly provided with a plurality of protrusions (5023).

4. The carbon fiber composite grounding device as described in claim 2, characterized in that: The upper and lower inner walls of the first and second strapping channels (5021) are provided with protrusions (5023). The top contour of the protrusion (5023) is a smoothly transitioned curved surface with a maximum radius of curvature of not less than 0.5 mm. The circumferential edge of the protrusion (5023) is connected to the inner wall surface through a gradual curvature to form a continuous surface without sharp edges.

5. The carbon fiber composite grounding device as described in claim 2, characterized in that: The upper inner walls of the first threading channel (5021) and the second threading channel (5022) are provided with spike-like protrusions (5023).

6. The carbon fiber composite grounding device as described in claim 1, characterized in that: The upper end face of the fixed hammer head (5012) is provided with a fixing hole (5013), the fixing hole (5013) has an internal thread, and the lower end face of the movable hammer head (502) is provided with a fixing post (5024) that can be screwed into the fixing hole (5013).

7. The carbon fiber composite grounding device as described in claim 1, characterized in that: The upper end face of the fixed hammer head (5012) is provided with a groove (5014), the lower end face of the movable hammer head (502) is provided with a protrusion (5025) that can be placed into the groove (5014), and the side wall of the groove (5014) is provided with several parallel transverse protrusions (5016).

8. The carbon fiber composite grounding device as described in claim 7, characterized in that: The cross-section of the protrusion (5016) is triangular, and the tips of the protrusions (5016) on the two side walls are arranged opposite each other.

9. The carbon fiber composite grounding device as described in claim 1, characterized in that: The connector (4) is a wedge-shaped non-metallic clamp.

10. The carbon fiber composite grounding device as described in claim 1, characterized in that: The movable hammer (502) is made of pure copper or oxygen-free copper.

Images