CN204257835U - Resistance module falls in a kind of special-shaped graphite ground connection - Google Patents

Abstract

The utility model discloses a special-shaped graphite grounding resistance reduction module, which comprises a graphite main body and electrodes connected to the graphite main body. The graphite main body is cylindrical, and the outer surface is connected by 8-12 inwardly concave arc surfaces. The graphite main body is provided with a plurality of through holes in the axial direction, and the arrangement of the arc surface and the through holes can increase the contact area between the grounding resistance reducing module and the ground on the one hand, and reduce the weight and cost of the graphite main body on the other hand; The arc surface is coated with a high water-absorbing protective film. The bottom end of the graphite main body is provided with a stainless steel cone head. One end of the electrode is inserted into the top of the graphite main body, and one end is exposed outside the graphite main body for connecting the grounding wire. The top of the graphite main body A stainless steel plate is further provided. The special-shaped graphite grounding resistance reducing module described in the utility model can more effectively reduce the grounding resistance, has high corrosion resistance, and is widely applicable.

Description

A special-shaped graphite grounding resistance reduction module

technical field

The utility model relates to a special-shaped graphite grounding resistance reducing module, which belongs to the technical field of grounding devices.

Background technique

The safe, stable and reliable operation of high-voltage transmission lines plays a key role in the entire power grid, and the tripping of transmission lines during operation is mainly caused by operating voltage, operating overvoltage or atmospheric overvoltage. At present, the operating overvoltage in the ultra-high voltage transmission system has been controlled at a relatively low level; at the same time, with the improvement of the insulation level of the line, the reliability of the transmission line under the action of the working voltage has also been significantly improved. Therefore, lightning strikes become the main cause of line failures. And reducing the grounding resistance of the transmission line tower is one of the important measures to improve the lightning protection level of the line and reduce the lightning tripping rate. Grounding design is the main part of electrical design, and it is one of the important devices to quickly discharge lightning current into the ground. When the natural grounding body cannot be fully utilized, it is necessary to lay artificial grounding devices to reduce resistance. The main factors affecting the grounding effect are the resistivity of the grounding soil, the selection of the artificial grounding body, and the construction technology and method.

A good electrical connection between a part of electrical equipment and the earth is called grounding, and the devices or equipment of the power system should be grounded according to regulations. The metal object in direct contact with the earth is called a grounding body or grounding electrode, and the wire connecting the grounding body and the grounding part of the equipment is called a grounding wire, and the grounding body and the grounding wire form a grounding device. In order to achieve the purpose of grounding, artificially buried metal parts such as round steel, flat steel, copper, alloys, etc. are called artificial grounding bodies; , the foundation of reinforced concrete building structures, metal pipes and equipment, etc. are called natural grounding bodies. The grounding device can use a natural grounding body or an artificial grounding body.

The main function of the tower grounding device of the power transmission line is to guide the lightning current into the ground to maintain a certain level of lightning resistance of the line, because the current intensity of the lightning has a high probability of lightning current with a small current amplitude, and the large-scale lightning The probability of occurrence is relatively small, so reducing the grounding resistance of transmission line towers plays an important role in improving the line's lightning resistance level and reducing the lightning tripping rate.

The existing laying methods of tower grounding devices mainly include horizontal laying, vertical laying, cathodic protection and so on. The basic practice of the current grounding project in my country is: the horizontal grounding body should be dug and buried, the steel vertical grounding body can be directly driven into the trench, and the distance should not be less than twice its length and should be evenly arranged, and the copper and graphite material grounding body It is advisable to dig a pit and bury it. Application practice has proved that these regulations and requirements are not only convenient for construction but also can achieve better drainage effect. When the grounding device is composed of multiple horizontal or vertical grounding bodies, in order to reduce the shielding effect of adjacent grounding bodies, the distance between the grounding bodies is specified as 5m. At this time, the corresponding utilization factor is relatively high, about 0.75-0.85. When the laying place of the grounding device is limited, the above distance can be appropriately reduced according to the actual situation, but generally it should not be less than the length of the grounding body.

In recent years, there are some difficult problems in the grounding of high-voltage transmission line poles and towers in practical engineering applications: one is that the grounding resistance of the grounding device cannot meet the specified requirements; the other is the stability of resistance reduction, especially in areas with high soil resistivity , although it can reduce the resistance very well during installation, the resistance reduction effect will be far reduced after a period of use, so it is not suitable for use; the third is the corrosion problem of the grounding body; the fourth is that the grounding body is easily damaged by external forces, for example, in the desert The towers in the area are grounded. When the wind blows, it is easy to blow away the sand and expose the grounding body. However, the towers in the cultivated land may sometimes damage the grounding body due to the cultivation of the farmland.

In view of this, the inventor conducted research on this, and specially developed a special-shaped graphite grounding resistance-reducing module, and this case arose from it.

Utility model content

The purpose of the utility model is to provide a special-shaped graphite grounding resistance reducing module which can more effectively reduce the grounding resistance, has high corrosion resistance and is widely applicable.

In order to achieve the above object, the solution of the present utility model is:

A special-shaped graphite grounding resistance reduction module, including a graphite main body and an electrode connected to the graphite main body, the graphite main body is cylindrical, and the outer surface is connected by 8-12 inwardly concave arc surfaces. The main body is provided with a plurality of through holes in the axial direction. The arrangement of the arc surface and the through holes can increase the contact area between the grounding resistance reducing module and the ground on the one hand, and reduce the weight and cost of the graphite main body on the other hand; the arc surface Both are coated with a high water-absorbing protective film. The bottom end of the graphite body is provided with a stainless steel conical head. One end of the electrode is inserted into the top of the graphite body, and one end is exposed outside the graphite body for connecting the grounding wire. The top of the graphite body is further provided with a stainless steel cone. plate.

Preferably, the superabsorbent protective film is a protective film of cellulose glue or a protective film of polyvinyl alcohol glue, which has strong water absorption and conducts electricity after absorbing water molecules.

Preferably, the stainless steel conical head is screwed or glued to the lower bottom surface of the graphite main body.

Preferably, the stainless steel plate is screwed or glued to the top surface of the graphite main body, and the stainless steel plate is provided with through holes corresponding to the graphite main body. The setting of the stainless steel plate will not damage the graphite main body when hitting the grounding resistance reduction module.

Preferably, the stainless steel plate is sleeved on the upper top surface of the graphite main body. After the special-shaped graphite grounding resistance reducing module is buried, the stainless steel plate can be removed, so that the upper surface of the graphite main body is in direct contact with the soil, increasing the grounding area.

Preferably, the stainless steel conical head is an inner hollow structure with a wall thickness of 0.5-4cm, which can not only bear the impact force, but also reduce the weight and cost of the whole grounding resistance reducing module.

Preferably, the electrode is arranged in a non-central region of the graphite body, such an arrangement facilitates direct action on the center of the graphite body when knocked without damaging the electrode.

Preferably, the main body of graphite is composite graphite obtained by high-temperature forging of flake graphite, cement and sandstone.

When the above-mentioned special-shaped graphite grounding resistance reducing module is used, the gravity directly acts on the stainless steel plate on the top of the graphite main body, and then the whole grounding resistance reducing module is buried under the ground through the stainless steel conical head. Compared with the traditional grounding device, the graphite-type grounding module described in the utility model mainly has the following advantages:

1. Because graphite is not corroded by acid, alkali, salt and soil pollutants, it has a long service life, while the resistance of conventional grounding devices will rust faster with the passage of time, and the grounding resistance will quickly increase or even fail. As time goes by, it will spread around the grounding electrode, which is equivalent to increasing the contact area with the earth, and the grounding resistance will continue to decrease;

2. It has good ion distribution. After being buried in the ground, the ions can be dissipated into the underground soil, forming a stable ion layer, improving the properties of the soil in a wide range, thereby reducing the diffusion resistance of the soil, and at the same time grounding the module After lightning discharge, an irreversible carbonization channel is formed in the soil, which can effectively reduce the soil resistivity;

3. The excavation area can be greatly reduced, especially in urban areas, industrial parks and areas where the length of the grounding body is limited. The substantial reduction of the excavation area is also conducive to protecting the environment, reducing vegetation damage, avoiding increased soil erosion, and reducing The engineering quantity of the excavation area saves investment;

4. The shape is stable, basically not affected by the climate, and will not change due to the passage of time. The chemical and physical properties are stable and will not be corroded. Due to the short grounding body, the chance of being damaged by external forces is also greatly reduced.

The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the schematic structural diagram of the special-shaped graphite grounding resistance reducing module of the present embodiment;

Fig. 2 is a top view of the graphite main body of this embodiment.

Detailed ways

As shown in Figure 1-2, a special-shaped graphite grounding resistance reduction module includes a graphite main body 1 and an electrode 2 connected to the graphite main body 1. The graphite main body 1 is cylindrical, and the outer surface consists of 8-12 The inner concave arc surface 11 is connected. The graphite main body is provided with a plurality of through holes 12 in the axial direction. On the one hand, the weight and cost of the graphite main body 1 can be reduced; the arc surface 11 is coated with a high water-absorbing protective film 3. In this embodiment, the high water-absorbing protective film is a cellulose glue protective film, and it can also be selected Polyvinyl alcohol adhesive protective film, high water absorption protective film 3 has strong water absorption, and conducts electricity after absorbing water molecules. One end of the electrode 2 is inserted into the top of the graphite main body 1, and one end is exposed outside the graphite main body 1 for connecting to a ground wire.

The bottom end of the graphite main body 1 is screwed with a stainless steel conical head 4, and the stainless steel conical head 4 can also be fixed on the bottom surface of the graphite main body 1 in other ways, such as bonding with glue, or fixing with a slot. The setting of the stainless steel conical head 4 makes it easier to insert the special-shaped graphite grounding resistance reduction module into the ground. The stainless steel conical head 4 is an inner hollow structure with a wall thickness of 0.5-4 cm, which can not only bear the impact force, but also reduce the weight and cost of the whole grounding resistance reduction module.

The top of the graphite main body is further provided with a stainless steel plate 5 . The stainless steel plate 5 can be fixedly installed on the top surface of the graphite main body 1 or not fixedly installed. When the graphite main body 1 is fixedly installed, the stainless steel plate 5 is provided with through holes corresponding to the graphite main body 1 . When the graphite main body 1 is not fixedly installed, after the grounding resistance reducing module is buried at a predetermined position, the stainless steel plate 5 can be directly removed, so that the top surface of the graphite main body 1 is in direct contact with the soil, increasing the grounding area. The setting of the stainless steel plate 5 is mainly used to protect the graphite main body 1, and the graphite main body 1 will not be damaged when the grounding resistance reducing module is struck.

The electrode 2 is arranged in the non-central area of the graphite main body 1, such arrangement is convenient to directly act on the center of the graphite main body when knocking, without damaging the electrode.

In this embodiment, the graphite main body 1 is composite graphite formed by high-temperature forging of flake graphite, cement and sandstone.

The above-mentioned embodiments and drawings do not limit the product form and style of the present utility model, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present utility model.

Claims (8)

1. A special-shaped graphite grounding resistance reduction module, characterized in that: it includes a graphite main body, and an electrode connected to the graphite main body, the graphite main body is cylindrical, and the outer surface is composed of 8-12 inwardly concave arcs The graphite main body is provided with a plurality of through holes in the axial direction; the arc surface is coated with a high water-absorbing protective film, the bottom of the graphite main body is provided with a stainless steel conical head, and one end of the electrode is inserted into the graphite main body. The top, one end of which is exposed outside the graphite main body is used for connecting the ground wire, and the top of the graphite main body is further provided with a stainless steel plate. 2. A special-shaped graphite grounding resistance-reducing module as claimed in claim 1, characterized in that: the high water-absorbing protective film is a protective film of cellulose glue or a protective film of polyvinyl alcohol glue. 3. A special-shaped graphite grounding resistance reducing module according to claim 1, wherein the stainless steel conical head is screwed or glued to the lower bottom surface of the graphite main body. 4. A special-shaped graphite grounding resistance-reducing module as claimed in claim 1, characterized in that: the stainless steel plate is screwed or glued to the upper top surface of the graphite main body, and the stainless steel plate is provided with a plate corresponding to the graphite main body. through holes. 5. A special-shaped graphite grounding resistance reducing module according to claim 1, wherein the stainless steel plate is sheathed on the top surface of the graphite main body. 6. A special-shaped graphite grounding resistance-reducing module as claimed in claim 1, characterized in that: the stainless steel conical head is an inner hollow structure with a wall thickness of 0.5-4cm. 7. A special-shaped graphite grounding resistance-reducing module according to claim 1, characterized in that: the electrodes are arranged in the non-central area of the graphite main body. 8. A special-shaped graphite grounding resistance-reducing module as claimed in claim 1, characterized in that: the graphite main body is a composite graphite formed by high-temperature forging of flake graphite, cement and sandstone.