Transformer grounding structure

Abstract

The utility model relates to the technical field of transformer grounding structures, in particular to a transformer grounding structure which comprises flat steel bodies arranged in a vertical state, the lower portions of the flat steel bodies are inserted into the ground and located on one side of a telegraph pole body, the upper portions of the flat steel bodies are located on the ground and provided with a plurality of grounding cable connecting points, and the number of the flat steel bodies is multiple. The plurality of flat steel bodies are distributed along the circumferential side of the telegraph pole body, the upper portions and the lower portions of the plurality of flat steel bodies are locked on the telegraph pole body through the locking hoop rings, the hoop rings are made of conductive materials, the plurality of flat steel bodies are connected in parallel to be grounded, the contact area between the flat steel bodies and the ground is increased, and therefore the grounding resistance in the initial stage of installation of the grounding structure is reduced. The flat steel body is welded on the ground, so that the adaptability of the grounding structure to environment change is further enhanced, the contact area between the flat steel body and the ground can be further increased by welding the conductive anchor cable at the bottom of the flat steel body, the coverage area is wider, and the adaptability to the environment is further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer grounding structures, in particular to a transformer grounding structure. Background Art

[0002] Most existing transformers adopt a four-in-one centralized grounding method, that is, a flat steel body is used as a grounding column, and its lower part is buried deep under the ground. Four grounding points are set on the upper part of the flat steel body. The four grounding points are connected to the positions where the transformer needs to be grounded through wires. The four grounding points are the distribution cabinet casing grounding point, the transformer casing grounding point, the transformer neutral point grounding point and the lightning arrester grounding point.

[0003] The existing problem with using flat steel bodies as grounding poles is that the contact area between the flat steel bodies and the ground is small, and the grounding resistance is large during the initial installation. When the soil dries further, the grounding resistance increases further, making the grounding resistance substandard and easily causing safety hazards. Utility Model Content

[0004] The utility model provides a transformer grounding structure, which increases the contact area between the flat steel bodies and the ground by arranging multiple flat steel bodies connected in parallel, reduces the grounding resistance during the initial installation of the grounding structure, and ensures the normal operation of the transformer.

[0005] The technical problem solved by the present invention is achieved by the following technical solutions:

[0006] The utility model provides a transformer grounding structure, comprising a flat steel body arranged in a vertical state, wherein the lower portion of the flat steel body is inserted under the ground and is located on one side of a power pole body, and the upper portion of the flat steel body is located above the ground and is provided with a plurality of grounding cable connection points. There are a plurality of flat steel bodies, and the plurality of flat steel bodies are distributed along the circumference of the power pole body, and the upper and lower portions of the plurality of flat steel bodies are locked on the power pole body by means of a locking hoop, and the hoop is made of a conductive material.

[0007] Preferably, the flat steel body is made of stainless steel.

[0008] Preferably, the plurality of flat steel bodies are evenly distributed circumferentially along the outer side of the electric pole body.

[0009] Preferably, the bottoms of the plurality of flat steel bodies are all welded with flexible conductive anchor cables.

[0010] Preferably, the conductive anchor cables at the bottom of the plurality of flat steel bodies extend in different directions.

[0011] Preferably, the grounding cable is fixed to the connection point on the flat steel body by bolt connection or welding.

[0012] The beneficial effect of the utility model is that multiple flat steel bodies are set up in parallel for grounding, which increases the contact area between the flat steel bodies and the ground, thereby reducing the grounding resistance in the initial installation of the grounding structure, and further enhancing the adaptability of the grounding structure to environmental changes.

[0013] By welding a conductive anchor cable at the bottom of the flat steel body, the contact area between the flat steel body and the ground can be further increased, and the coverage area is wider, and the adaptability to the environment is further enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the implementation scheme of the present invention or the technical scheme in the prior art, the drawings required for use in the implementation scheme or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation schemes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1 This is a schematic diagram of the structure of the prior art of the utility model:

[0016] Figure 2 For this utility model Figure 1 A magnified schematic diagram of point A in the middle;

[0017] Figure 3 It is a structural diagram of the utility model;

[0018] Figure 4 It is a front view of the utility model.

[0019] In the figure, 1. Utility pole; 2. Flat steel body; 201. Lightning arrester grounding point; 202. Transformer neutral point grounding point; 203. Transformer casing grounding point; 204. Distribution cabinet casing grounding point; 3. Hoop; 4. Ground; 5. Conductive anchor cable. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0021] refer to Figure 1-Figure 2, is a schematic diagram of the existing transformer grounding structure of the present invention, which includes a flat steel body 2 inserted on one side of the electric pole body 1, the lower part of the flat steel body 2 is inserted under the ground 4, and the upper part of the flat steel body 2 is reserved above the ground 4. The flat steel body 2 reserved above the ground 4 has four grounding connection points, namely the distribution cabinet shell grounding connection point, the transformer shell grounding connection point, the transformer neutral point connection point and the lightning arrester grounding point 201. Since the four grounding connection points are connected to one flat steel body 2, the common connection between the connection point and the cable is mostly welding or bolting. Therefore, the grounding resistance at the initial installation needs to be controlled within a reasonable range. The existing transformer grounding resistance is usually calculated using the following formula:

[0022] Rg = ρ × (1.2 + 0.38 × lg) / S, where Rg is the grounding resistance and ρ is the soil resistivity, a key factor affecting grounding resistance and dependent on soil composition, temperature, humidity, and other conditions. In practical applications, accurate soil resistivity values ​​can be obtained by measurement or reference to relevant data. lg is the length of the grounding electrode, and S is the cross-sectional area of ​​the grounding electrode. Soil resistivity varies with environmental conditions. For example, in dry weather, the soil contains less moisture and the soil resistivity is higher, while on rainy days, the soil moisture increases and the soil resistivity decreases. Therefore, the grounding resistance value of the transformer after installation also varies with environmental changes. To ensure the stability and reliability of the grounding structure, the transformer's grounding resistance is typically set to no higher than a specific value. However, in areas with significant environmental fluctuations, it is very likely that the grounding resistance value meets the requirements when the grounding structure is installed, but increases as the environment changes and becomes drier, affecting the normal operation of the transformer.

[0023] Based on this, reference Figure 3 and Figure 4 The transformer grounding structure designed by the present invention is increased to multiple flat steel bodies 2 on the basis of the original single flat steel body 2, and conductive connection can be achieved through the hoop 3. Since the multiple flat steel bodies 2 are inserted under the ground 4 in parallel, the contact area between the flat steel body 2 and the ground 4 is increased, thereby reducing the grounding resistance. Compared with the traditional single flat steel body 2, the grounding resistance of the grounding structure during the initial installation can be greatly reduced, and the situation where the grounding resistance exceeds the expected resistance value due to the dry environment can be reduced.

[0024] Furthermore, the flat steel body 2 can be made of stainless steel with good conductivity, high hardness and not easy to corrode. Multiple flat steel bodies 2 are evenly distributed circumferentially along the outer side of the pole body 1, which can make the multiple flat steel bodies 2 dispersed and cover a wider area, avoiding the overall grounding resistance caused by a certain local environmental change in the soil. For example, multiple flat steel bodies 2 are evenly distributed circumferentially, so some flat steel bodies 2 will be on the backlit side of the pole body 1. The soil contacted by the flat steel bodies 2 in the backlit area is moist, and a good conductive effect to the ground is always maintained.

[0025] Furthermore, the bottom of the flat steel body 2 is welded with a conductive anchor cable 5 , which extends in different directions, thereby further ensuring the coverage area and further preventing the influence of local environmental changes on the conductive performance of the flat steel body 2 .

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A transformer grounding structure, comprising a flat steel body (2) arranged in a vertical state, wherein the lower portion of the flat steel body (2) is inserted below the ground (4) and is located on one side of a power pole (1), and the upper portion of the flat steel body (2) is located above the ground (4) and is provided with a plurality of grounding cable connection points, characterized in that: There are multiple flat steel bodies (2), and the multiple flat steel bodies (2) are distributed along the circumference of the electric pole body (1). The upper and lower parts of the multiple flat steel bodies (2) are locked on the electric pole body (1) through locking rings (3), and the rings (3) are made of conductive material.

2. A transformer grounding structure according to claim 1, characterized in that: The flat steel body (2) is made of stainless steel.

3. The transformer grounding structure according to claim 1, characterized in that: The plurality of flat steel bodies (2) are evenly distributed circumferentially along the outer side of the electric pole body (1).

4. The transformer grounding structure according to claim 1, characterized in that: The bottoms of the plurality of flat steel bodies (2) are all welded with flexible conductive anchor cables (5).

5. The transformer grounding structure according to claim 4, characterized in that: The conductive anchor cables (5) at the bottom of the plurality of flat steel bodies (2) extend in different directions.

6. The transformer grounding structure according to claim 1, characterized in that: The grounding cable and the connection point on the flat steel body (2) are fixed by bolt connection or welding.

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