CN215600577U - Transformer substation grounding grid structure - Google Patents
Transformer substation grounding grid structure Download PDFInfo
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- CN215600577U CN215600577U CN202122278045.3U CN202122278045U CN215600577U CN 215600577 U CN215600577 U CN 215600577U CN 202122278045 U CN202122278045 U CN 202122278045U CN 215600577 U CN215600577 U CN 215600577U
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Abstract
The utility model discloses a transformer substation grounding grid structure which comprises a plurality of layers of grounding grids, wherein two adjacent layers of grounding grids are connected through a plurality of angle steels, the bottom of the grounding grid at the lowest layer is connected with a plurality of vertical grounding electrodes, and the plurality of vertical grounding electrodes extend to the lower part of the grounding grid at the lowest layer. The utility model can obviously reduce the grounding resistance, the step voltage and the contact potential of the grounding grid, thereby reducing the probability of repeated construction of the grounding grid, shortening the construction period to a certain extent, and also putting an end to the risk of counterattack and electric shock caused by the rise of the step voltage in the process of inspecting equipment by power transformation operators.
Description
Technical Field
The utility model relates to the technical field of transformer substation grounding grids, in particular to a transformer substation grounding grid structure.
Background
The grounding grid is a general term for a grounding body which is composed of a plurality of metal grounding electrodes buried in the ground to a certain depth and a net structure formed by connecting the grounding electrodes with each other by conductors. The novel shielding device is widely applied to industries such as electric power, buildings, computers, industrial and mining enterprises and communication, and plays roles in safety protection, shielding and the like.
At present, due to strict control of a local government on a basic farmland, most newly-built transformer substations are located in the places with barren soil and more rocks, and therefore the resistance of a grounding grid of the newly-built transformer substations is often unqualified.
In general, geological survey is carried out by a design unit, and grounding grid data is calculated, which theoretically meets the requirements of regulations and specifications, so that a designer usually designs a single-layer grounding grid according to a conventional scheme.
However, after the construction of the transformer substation grounding grid is completed, the grounding resistance of the grounding grid needs to be tested in the field, if the tested grounding resistance does not meet the requirement, the grounding resistance of the grounding grid needs to be re-optimized and designed, the step voltage and the contact potential are checked, and the original grounding grid needs to be removed and re-constructed until all data are verified to be qualified, so that the construction period is seriously influenced.
Because the design of the traditional transformer substation grounding grid adopts the single-layer grounding grid design, the probability that the grounding resistance, the step voltage and the contact potential exceed the allowable values is higher, the probability of repeated construction of the grounding grid can be increased, and the construction period is influenced.
In view of this, the present application is specifically made.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the design of the traditional transformer substation grounding grid adopts a single-layer grounding grid design, the probability that the grounding resistance, the step voltage and the contact potential exceed allowable values is high, the probability of repeated construction of the grounding grid can be increased, and the construction period is influenced.
The utility model is realized by the following technical scheme:
the utility model provides a transformer substation's grounding grid structure, includes the multilayer grounding grid, wherein, connects through many angle steel between the adjacent two-layer grounding grid, and the bottom of lower floor's grounding grid is connected with many perpendicular earthing poles, many perpendicular earthing poles extend to the below of lower floor's grounding grid.
Further, the multilayer grounding grid is a two-layer grounding grid, specifically an upper-layer grounding grid and a lower-layer grounding grid.
Further, weld through many angle irons between upper strata grounding grid and the lower floor's grounding grid, the one end and the lower floor's grounding grid welding of many perpendicular earthing poles, the other end extends to the below of lower floor's grounding grid.
The connection mode between upper grounding grid and lower grounding grid can be welding, and also can be other connection modes, such as: and (6) crimping. However, in order to achieve better conductivity, the upper grounding grid and the lower grounding grid are welded.
Further, the distance between the upper grounding grid and the lower grounding grid is 500-700 mm.
Further, upper grounding grid and lower floor's grounding grid are many horizontal ground flat steel cross connection's latticed structure, and wherein, the interval of two adjacent parallel horizontal ground flat steel is 5000 ~ 7000 mm.
Furthermore, the length of the vertical grounding electrode is 2000 mm-3000 mm.
Furthermore, the material of the horizontal grounding flat steel is hot galvanizing flat steel.
Further, the vertical grounding electrode is any one of angle steel or steel pipe.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
the double-layer grounding grid structure of the transformer substation can obviously reduce grounding grid grounding resistance, step voltage and contact potential, thereby reducing the probability of repeated construction of the grounding grid, shortening the construction period to a certain extent, and avoiding the counterattack and electric shock risks caused by the rise of the step voltage in the process of patrolling equipment by transformer operators.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Reference numbers and corresponding part names in the drawings:
1-vertical grounding electrode, 2-horizontal grounding flat steel and 3-angle steel.
Detailed Description
The transformer substation grounding grid structure disclosed by the embodiment is used for solving the technical problems that the grounding resistance, the step voltage and the contact potential of the traditional transformer substation grounding grid are higher than the allowable value due to the adoption of a single-layer grounding grid design, so that the repeated construction probability of the grounding grid is increased, and the construction period is influenced.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The transformer substation grounding grid structure that this embodiment 1 provided has two-layer grounding grid, as shown in fig. 1, specifically is upper grounding grid and lower floor's grounding grid, wherein, welds through many angle steel 3 between upper grounding grid and the lower floor's grounding grid, and the welding of the bottom of lower floor's grounding grid has many perpendicular earthing poles 1, the one end of many perpendicular earthing poles 1 and the bottom welding of lower floor's grounding grid, the other end extend to the below of lower floor's grounding grid, and perpendicular earthing pole 1's length is 2500 mm.
The distance between upper ground net and the lower floor's ground net is 600 mm. The upper grounding grid and the lower grounding grid are grid-shaped structures formed by cross-connecting a plurality of horizontal grounding flat steels 2, wherein the interval between two adjacent parallel horizontal grounding flat steels 2 is 6000 mm. The horizontal grounding flat steel 2 is made of hot galvanizing flat steel. The vertical grounding electrode 1 is made of a steel pipe.
The laying method of example 1 is as follows:
firstly, before the design of the transformer substation grounding grid is carried out, data collection work of geological survey is carried out, the requirements of design rules and specifications are combined, a method of connecting the double-layer grounding grids in parallel is adopted, the grounding resistance is calculated in detail, the step voltage and the contact potential are checked, and the method of connecting the double-layer grounding grids in parallel is adopted through calculation and checking, so that the grounding resistance, the step voltage and the contact potential of the transformer substation can be obviously reduced.
Secondly, laying a lower-layer grounding net by adopting horizontal grounding flat steel according to the interval distance of 6000 mm; meanwhile, a certain number of vertical grounding electrodes are arranged, the vertical grounding electrodes in the implementation are steel pipes, the length of each steel pipe is 2500mm, a plurality of steel pipes are knocked into soil, one ends of the steel pipes extend into the soil, and the other ends of the steel pipes are welded with a lower-layer grounding grid;
then, after the lower layer grounding net is laid, the upper layer grounding net is laid by adopting horizontal grounding flat steel at the position of 600mm above, and the horizontal grounding net is also laid at the equal interval of 6000 mm. And a plurality of angle steels 3 are welded between the upper grounding grid and the lower grounding grid.
And finally, filling soil between the upper grounding grid and the lower grounding grid.
Example 2
The transformer substation grounding grid structure that embodiment 1 provided has the three-layer grounding grid, specifically is upper strata grounding grid, middle level grounding grid and lower floor's grounding grid, wherein, welds through many angle steel 3 between the adjacent two-layer grounding grid, and the bottom welding of lower floor's grounding grid has many perpendicular earthing poles 1, the one end of many perpendicular earthing poles 1 and the bottom welding of lower floor's grounding grid, the other end extend to the below of lower floor's grounding grid, and the length of perpendicular earthing pole 1 is 2500 mm.
The distance between upper strata grounding grid and the well grounding grid is 600mm, and the distance between well grounding grid and the lower floor grounding grid is 600mm, upper strata grounding grid, well grounding grid and lower floor grounding grid are many horizontal ground flat steel 2 cross connection's latticed structure, and wherein, the interval of two adjacent parallel horizontal ground flat steel 2 is 6000 mm. The horizontal grounding flat steel 2 is made of hot galvanizing flat steel. The vertical grounding electrode 1 is made of a steel pipe.
The following is the laying method of example 2:
firstly, before the design of the transformer substation grounding grid is carried out, data collection work of geological survey is carried out, the requirements of design rules and specifications are combined, a three-layer grounding grid parallel connection method is adopted, the grounding resistance is calculated in detail, the step voltage and the contact potential are checked, and the transformer substation grounding resistance, the step voltage and the contact potential can be obviously reduced by adopting the three-layer grounding grid parallel connection method through calculation and checking.
Secondly, laying a lower-layer grounding net by adopting horizontal grounding flat steel according to the interval distance of 6000 mm; meanwhile, a certain number of vertical grounding electrodes are arranged, the vertical grounding electrodes in the implementation are steel pipes, the length of each steel pipe is 2500mm, a plurality of steel pipes are knocked into soil, one ends of the steel pipes extend into the soil, and the other ends of the steel pipes are welded with a lower-layer grounding grid;
then, after the lower layer grounding net is laid, the middle layer grounding net is laid at the position of 600mm above the lower layer grounding net by adopting horizontal grounding flat steel, and the horizontal grounding nets are also laid at equal intervals of 6000 mm. A plurality of angle steels 3 are welded between the upper grounding net and the middle grounding net. Similarly, after the middle layer grounding grid is laid, the upper layer grounding grid is laid by adopting horizontal grounding flat steel at the position 600mm above the middle layer grounding grid, and the horizontal grounding grid is also laid at the equal interval of 6000 mm. And a plurality of angle steels 3 are welded between the middle-layer grounding grid and the upper-layer grounding grid.
And finally, filling soil among the upper grounding grid, the middle grounding grid and the lower grounding grid.
Practice proves that the utility model can obviously reduce the grounding resistance, the step voltage and the contact potential of the transformer substation, reduce the probability of repeated construction of the grounding grid and shorten the construction period to a certain extent; the grounding grid structure of the transformer substation is adopted in the design of the grounding grid of the transformer substation, and the counterattack electric shock risk caused by the rise of the step voltage in the process of inspecting equipment by a transformer operator can be reduced.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a transformer substation's ground connection net structure, its characterized in that includes the multilayer ground connection net, wherein, connects through many angle steel (3) between the adjacent two-layer ground connection net, and the bottom of lower floor's ground connection net is connected with many perpendicular earthing poles (1), many perpendicular earthing poles (1) extend to the below of lower floor's ground connection net.
2. The substation grounding grid structure according to claim 1, wherein the multilayer grounding grid is a two-layer grounding grid, in particular an upper-layer grounding grid and a lower-layer grounding grid.
3. The substation grounding grid structure according to claim 2, wherein the upper grounding grid and the lower grounding grid are welded by a plurality of angle steels (3), one ends of the plurality of vertical grounding electrodes (1) are welded with the lower grounding grid, and the other ends of the plurality of vertical grounding electrodes extend to the lower part of the lower grounding grid.
4. A substation grounding grid structure according to claim 3, characterized in that the distance between the upper and lower grounding grids is 500mm to 700 mm.
5. The substation grounding grid structure according to claim 3, wherein the upper grounding grid and the lower grounding grid are both grid-shaped structures formed by cross-connecting a plurality of horizontal grounding flat steels (2), and the interval between two adjacent parallel horizontal grounding flat steels (2) is 5000-7000 mm.
6. A substation grounding grid structure according to claim 3, characterized in that the length of the vertical grounding pole (1) is 2000mm to 3000 mm.
7. A substation grounding grid structure according to claim 5, characterized in that the horizontal grounding flat steel (2) is made of hot galvanized flat steel.
8. A substation grounding grid structure according to claim 1, characterized in that the vertical grounding electrode (1) is any one of an angle steel or a steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122278045.3U CN215600577U (en) | 2021-09-18 | 2021-09-18 | Transformer substation grounding grid structure |
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| CN202122278045.3U CN215600577U (en) | 2021-09-18 | 2021-09-18 | Transformer substation grounding grid structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114759374A (en) * | 2022-04-25 | 2022-07-15 | 中建八局第二建设有限公司 | Independent grounding device for important equipment and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114759374A (en) * | 2022-04-25 | 2022-07-15 | 中建八局第二建设有限公司 | Independent grounding device for important equipment and construction method thereof |
| CN114759374B (en) * | 2022-04-25 | 2024-05-10 | 中建八局第二建设有限公司 | Independent grounding device for important equipment and construction method thereof |
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