CN111859583A - Grounding grid of railway traction substation in plateau mountain area and construction method thereof - Google Patents
Grounding grid of railway traction substation in plateau mountain area and construction method thereof Download PDFInfo
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Abstract
The invention relates to a plateau mountain railway traction substation grounding grid and a construction method thereof. The construction method comprises the following steps: constructing a soil model of a traction substation with high fill and frozen plateau soil, and dividing the soil model into at least three soil layers; the at least three soil layers comprise at least one frozen soil layer, at least one filling layer positioned on the upper side of the frozen soil layer and at least one auxiliary layer positioned on the lower side of the frozen soil layer; determining the ground short-circuit current of the traction substation; establishing a layered and distributed three-dimensional grounding network; the three-dimensional grounding grid comprises at least three layers of grounding grids, wherein at least one layer of grounding grid is positioned on the auxiliary layer, at least one layer of grounding grid is positioned on the filling layer and is used as an equipment grounding grid, and at least one layer of grounding grid is positioned between the equipment grounding grid and the grounding grid in the auxiliary layer, and the adjacent layers of grounding grids are electrically connected; judging whether the three-dimensional grounding grid meets the grounding requirement or not based on the grounding short-circuit current and the grounding grid parameters of the three-dimensional grounding grid; if not, the three-dimensional grounding grid is adjusted until the grounding requirement is met.
Description
Technical Field
The disclosure relates to the technical field of a traction substation grounding system, in particular to a plateau mountain railway traction substation grounding grid and a construction method thereof.
Background
With the development of society, electrified railways gradually extend to mountain areas and plateau areas. In the method, the landform of the mountain railway is complex, which often accompanies geological conditions of vertical and horizontal gullies and deep mountain and high valleys, the line-bridge-tunnel ratio is high, and the site selection of a traction substation (hereinafter, also referred to as a "substation") is difficult. The traction substation is arranged in a mountain area, the area of a field ground which is much smaller than that of a plain area is often required, the area of a grounding grid of the substation is limited, and the smaller the area of the grounding grid is, the larger the grounding resistance is, so that the equipment and personal safety are more unfavorable.
Meanwhile, valleys and rivers are generally distributed in mountainous areas, and traction power transformation arranged in the mountainous areas is threatened by flood. The water level rises in the rain season, and the water level can rise by several meters in the canyon than in the dry season. In order to ensure the safety of the site, according to the design specifications, the elevation of the site of the traction substation is required to be above the 100-year flood level, and the elevation of the site of the subarea and AT sites is required to be above the 50-year flood level, so that the site of the mountain area must adopt high fill, the hundred-year flood level of part of projects is more than ten meters or even more than ten meters higher than the original ground, and a large amount of fill projects are required for traction substation. Most of filling materials are broken stones, the soil resistivity is high and basically is more than 1000 omega.m, and the filling materials are very unfavorable for a ground system.
In plateau areas, due to the fact that seasonal or permanent frozen soil exists due to cold winter, the resistivity of soil in different seasons changes greatly, and great uncertainty and instability are brought to the performance of a grounding grid buried in the plateau areas. In conclusion, the design of the grounding grid of the traction substation in the highland mountain railway is difficult.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the disclosure provides a grounding grid of a railway traction substation in a highland and mountain area and a construction method thereof, which are applicable to terrain, geological conditions and the like of the railway in the highland and mountain area and can simplify the construction difficulty of the grounding grid.
The invention provides a method for constructing a grounding grid of a railway traction substation in a plateau mountain area, which comprises the following steps:
building a soil model of a traction substation with high fill and frozen plateau soil, and dividing the soil model into at least three soil layers; the at least three soil layers comprise at least one frozen soil layer, at least one filling layer positioned on the upper side of the frozen soil layer and at least one auxiliary layer positioned on the lower side of the frozen soil layer;
determining the ground short-circuit current of the traction substation;
establishing a layered and distributed three-dimensional grounding network; the three-dimensional grounding grid comprises at least three layers of grounding grids, wherein at least one layer of grounding grid is positioned on the auxiliary layer, at least one layer of grounding grid is positioned on the filling layer and is used as an equipment grounding grid, at least one layer of grounding grid is positioned between the equipment grounding grid and the grounding grid in the auxiliary layer, and the adjacent layers of grounding grids are electrically connected;
Judging whether the three-dimensional grounding grid meets grounding requirements or not based on the grounding short-circuit current and grounding grid parameters of the three-dimensional grounding grid;
and if not, adjusting the three-dimensional grounding grid until the grounding requirement is met.
Optionally, dividing the soil model into at least three soil layers comprises:
and performing equivalent treatment on the soil model according to horizontal layering, and dividing the soil model into at least three soil layers according to the resistivity of the soil.
Optionally, before building a soil model of a traction substation with high fill and frozen plateau soil and dividing the soil model into at least three soil layers, the method further comprises:
the method comprises the steps of obtaining a terrain model of high fill and plateau frozen soil, and determining the resistivity of the soil at each position in the terrain model.
Optionally, the determining the ground short-circuit current of the traction substation includes:
and calculating a shunt coefficient based on the system short-circuit capacity, the grounding resistance and the external power supply circuit model of the traction substation, and determining the grounding short-circuit current of the traction substation.
Optionally, each layer of the ground screen is made of a metal conductor material, and the adjacent layers of the ground screens are electrically connected by the metal conductor.
Optionally, the manner of adjusting the stereo grounding grid includes at least one of the following:
Expanding the laying area of at least one layer of the ground net;
increasing the depth of the counterpoise in the auxiliary layer; and
and increasing the layer number of the ground net.
Optionally, satisfying the grounding requirement includes: the ground resistance, ground potential and step potential all satisfy the safe threshold range.
The present disclosure also provides a grounding grid for a railway traction substation in a plateau mountain area, which can be constructed by applying the above construction method, and the grounding grid includes:
the three-dimensional grounding grid is formed by at least three layers of grounding grids and is associated with the soil model; wherein, at least one layer of grounding grid is positioned on the auxiliary layer, at least one layer of grounding grid is positioned on the filling layer and is used as an equipment grounding grid, and at least one layer of grounding grid is positioned between the equipment grounding grid and the grounding grid in the auxiliary layer, and the adjacent layers of grounding grids are electrically connected; the three-dimensional grounding grid meets the grounding requirement.
Optionally, the density of the meshes of the ground net is increased in sequence along the direction from the auxiliary layer to the filling layer.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages: building a soil model based on high fill and plateau frozen soil, dividing the soil model into at least three soil layers including frozen soil layers, fill layers and auxiliary layers, building a layered and distributed three-dimensional grounding grid based on the soil model, wherein at least one grounding grid in the three-dimensional grounding grid is positioned below the frozen soil layers, at least one grounding grid is used as an equipment grounding grid, and an intermediate grounding grid can be set into at least one layer according to the soil thickness in the soil model; and then, judging whether the three-dimensional grounding grid meets the grounding requirement or not based on the grounding grid parameters of the three-dimensional grounding grid and the grounding short-circuit current of the traction substation, and adjusting the three-dimensional grounding grid when the three-dimensional grounding grid does not meet the grounding requirement until the three-dimensional grounding grid meets the grounding requirement. So, can make this three-dimensional grounding net adapt to the relief topography and the geological conditions in high mountain area, and through forming the three-dimensional grounding net of layering, distributing type, compensate the limited problem of ground net transversely laying the area through extension on vertical to can lay the grounding net that satisfies the ground connection demand in limited small area, reduce the requirement to the environment, and then reduced the construction degree of difficulty of grounding net.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for constructing a ground grid of a railway traction substation in a highland and mountainous area according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a grounding grid of a railway traction substation in a plateau mountain area according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another high altitude mountain railway traction substation grounding grid according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments. The various embodiments of the disclosure, generally described and illustrated in the figures herein, may be combined with each other, and the structural components or functional blocks thereof may be arranged and designed in a variety of different configurations, without conflict. Thus, the following detailed description of the embodiments of the present disclosure, presented in the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the disclosed products are conventionally placed in use, and are only for convenience in describing and simplifying the present disclosure, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure. Moreover, relational terms such as "first," "second," "third," and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present disclosure, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
According to the grounding grid of the railway traction substation in the highland and mountainous area and the construction method thereof, the layered and distributed three-dimensional grounding grid structure is constructed according to the soil geological conditions of the highland and mountainous area, and the structural parameters of the grounding grid are adjusted, so that the grounding grid can adapt to the terrain, geological conditions and the like of the railway in the highland and mountainous area, and the grounding grid can meet the purposes of compliance, economy and long acting. The grounding grid of the railway traction substation in the highland and mountain area provided by the embodiment of the disclosure is exemplarily described below with reference to fig. 1 to 2.
Fig. 1 is a schematic flow chart of a method for constructing a ground grid of a railway traction substation in a highland and mountainous area according to an embodiment of the present disclosure. Referring to fig. 1, the construction method includes:
S110, building a soil model of the traction substation with high fill and frozen plateau soil, and dividing the soil model into at least three soil layers.
Wherein, at least three layers of soil layer include at least one deck frozen soil layer, lie in at least one deck fill layer of frozen soil layer upside and lie in at least one deck auxiliary layer of frozen soil layer downside.
In this case, the properties of the soil, in particular the resistivity of the soil, have a direct influence on the ground resistance of the ground network of the traction substation. Illustratively, the resistivity of the permafrost varies greatly from season to season, the soil resistivity of the fill layer is generally high, and the soil resistivity of the auxiliary layer below the permafrost is generally low. In the step, the soil model is divided into at least three soil layers, and preparation is made for laying each layer of the grounding grid of the three-dimensional grounding grid in the subsequent step.
For example, referring to fig. 2 or fig. 3, a filling layer is provided between the original ground 002 and the terrace ground 003, the tundra 001 may be located under the original ground 002, and the auxiliary layer is located under the tundra 001. This is merely an example of the relative relationship between each layer, and in an actual application process, each layer may have undulation along with an actual topographic terrain, which is not limited in this disclosure.
And S120, determining the grounding short-circuit current of the traction substation.
The step is used for subsequently judging whether the three-dimensional grounding grid meets the grounding requirement or not.
Illustratively, this step may be implemented using a power excitation model. For example, the FSDIST module of the CDEGS software can be used to simulate an external power line of a traction substation, and the short-circuit current to the ground when the traction substation is short-circuited is calculated by combining the system short-circuit capacity.
In other embodiments, other ways known to those skilled in the art may also be used to determine the ground short circuit current of the traction substation, which is not limited by the embodiments of the present disclosure.
And S130, establishing a layered and distributed three-dimensional grounding grid.
The three-dimensional grounding grid 10 comprises at least three layers of grounding grids, wherein at least one layer of grounding grid is positioned on an auxiliary layer, at least one layer of grounding grid is positioned on a filling layer and serves as an equipment grounding grid, and at least one layer of grounding grid is positioned between the equipment grounding grid and the grounding grid in the auxiliary layer, and the adjacent layers of grounding grids are electrically connected.
Illustratively, referring to fig. 2 or 3, the equipment grounding grid is shown as a top layer grounding grid 13, the grounding grid arranged in the auxiliary layer is actually positioned below the frozen soil layer 001, and is shown as a bottom layer grounding grid 11, each layer of grounding grid between the top layer grounding grid 13 and the bottom layer grounding grid 11 can be called as a middle layer grounding grid 12, and the middle layer grounding grid 12 can be optionally arranged into a single layer (as shown in fig. 3), a double layer (as shown in fig. 2) or multiple layers (not shown in the figure) according to the thickness of a filling layer in the soil model; on the basis, the 'cage' -shaped three-dimensional grounding grid 10 with a multi-layer distribution structure is formed by electrically connecting the grounding grids. The three-dimensional grounding grid 10 can be constructed in accordance with the topographic and topographic features and geological features of the plateau mountain areas, and the occupied transverse space can be reduced through the construction of the three-dimensional structure, so that the construction difficulty of the grounding grid of the plateau mountain areas is favorably reduced.
S140, judging whether the three-dimensional grounding grid meets grounding requirements or not based on the grounding short-circuit current and the grounding grid parameters of the three-dimensional grounding grid.
The three-dimensional grounding grid meets the grounding requirement, namely the three-dimensional grounding grid meets the equipment safety and the personal safety when short circuit faults occur in traction and transportation. This step may include: and verifying various performance indexes of the grounding grid during the internal short circuit of the traction station based on the grounding short circuit current and the grounding grid parameters of the three-dimensional grounding grid. Specific key performance indicators are shown below by way of example.
If not, the three-dimensional grounding grid does not meet the grounding requirement, and then S150 is executed.
And S150, adjusting the three-dimensional grounding grid until the grounding requirement is met.
Therefore, the three-dimensional grounding grid which is suitable for the highland and mountain areas and meets the grounding requirement is formed.
The method for constructing the grounding grid of the railway traction substation in the plateau mountain area comprises the steps of building a soil model based on high fill and plateau frozen soil, dividing the soil model into at least three soil layers including a frozen soil layer, a fill layer and an auxiliary layer, building a layered and distributed three-dimensional grounding grid based on the soil model, wherein at least one layer of grounding grid in the three-dimensional grounding grid is positioned below the frozen soil layer, at least one layer of grounding grid is used as an equipment grounding grid, and the middle layer of grounding grid can be set into at least one layer according to the thickness of soil in the soil model; and then, whether the three-dimensional grounding grid meets the grounding requirement is judged based on the grounding grid parameters of the three-dimensional grounding grid and the ground short circuit current of the traction substation, the three-dimensional grounding grid is adjusted when the three-dimensional grounding grid does not meet the grounding requirement until the three-dimensional grounding grid meets the grounding requirement, the three-dimensional grounding grid can adapt to the terrain topography and geological conditions of the plateau mountain area, the problem that the transverse arrangement area of the grounding grid is limited is solved through forming the layered and distributed three-dimensional grounding grid and extending in the longitudinal direction, so that the grounding grid meeting the grounding requirement can be arranged in the limited area, the requirement on the environment is reduced, and the construction difficulty of the grounding grid is further reduced.
In one embodiment, the dividing of the soil model into at least three soil layers in S110 may include: and performing equivalent treatment on the soil model according to horizontal layering, and dividing the soil model into at least three soil layers according to the resistivity of the soil.
The method has the advantages that the layering mode of the soil model can be simplified through horizontal layering equivalent treatment, and the construction method is suitable for plateau mountain areas and is beneficial to reducing the construction difficulty of the grounding grid.
On the basis, the soil resistivity can be represented by the average resistivity, the minimum resistivity, the maximum resistivity or other representative resistivity values of soils with different components in a single layer after horizontal delamination. By carrying out interval division on the soil resistivity in order of magnitude, the soil model can be divided into at least three soil layers. For example, adjacent single layers with the soil resistivity of 10 Ω · m level are divided into the same soil layer, adjacent single layers with the soil resistivity of 100 Ω · m level are divided into another soil layer, and adjacent single layers with the resistivity of 1000 Ω · m level are divided into another soil layer.
In an embodiment, before S110, the method may further include: the method comprises the steps of obtaining a terrain model of high fill and plateau frozen soil, and determining the resistivity of the soil at each position in the terrain model.
The terrain model can be measured on site or local terrain data can be taken to be established, and the resistivity of the soil can be obtained through measurement, so that a basis is provided for establishing the soil model.
In one embodiment, S120 may include: and calculating a shunt coefficient based on the system short-circuit capacity, the grounding resistance and an external power supply circuit model (also called a power supply excitation model) of the traction substation, and determining the grounding short-circuit current of the traction substation.
For example, the external power line model of the traction substation may include power incoming line voltage, line length, tower span of the power transmission line, type of ground line, and the like. Based on the above parameters, in the FSDIST module of the CDEGS software, the incoming short circuit current of the traction substation may be determined.
In one embodiment, each layer of the ground screen is made of a metal conductor material, and adjacent ground screens are electrically connected by the metal conductor.
Therefore, the three-dimensional grounding grid can be constructed in structure and shape by adopting an engineering method, so that the traditional resistance reducing measures such as resistance reducing agent, ion grounding electrode, deep well grounding and the like are avoided, the problem of timeliness is solved, and the grounding grid can run stably and reliably for a long time; meanwhile, as the conventional metal grounding material can be adopted, on the premise of achieving the grounding effect with the same effect, the economy is far better than that of resistance reducing measures such as resistance reducing agent, ion grounding electrode or deep well grounding, and the like, and the cost is reduced.
In an embodiment, the manner of adjusting the stereo grounding grid in S150 includes at least one of the following: expanding the laying area of at least one layer of ground net; increasing the depth of the counterpoise in the auxiliary layer; and increasing the number of layers of the counterpoise.
The laying area of the grounding grid is enlarged, the grounding area of the grounding grid can be enlarged, and the grounding effect is improved; the depth of the ground net in the auxiliary layer is increased, so that the ground net at the bottom layer is favorably contacted with a soil layer with lower resistivity, and the grounding effect is favorably improved; the number of layers of the grounding grid is increased, so that the integral resistance of the three-dimensional grounding grid is favorably reduced, and the grounding effect is improved. Therefore, the adjusted three-dimensional grounding grid can meet the grounding requirement through at least one adjustment.
In one embodiment, the meeting the grounding requirement in S150 includes: the ground resistance, ground potential and step potential all satisfy the safe threshold range.
The grounding resistance needs to be as small as possible, and the contact potential and the stepping potential need to be as small as possible so as to meet equipment safety and personal safety when the traction substation is in short circuit.
For example, the mallz module of the CDEGS software may be used to perform simulation calculation on the three-dimensional grounding grid in combination with the soil model and the power excitation model in the above text to determine whether each of the above indexes meets the safety threshold range.
For example, the safety threshold ranges of the ground resistance, the ground potential, and the step potential may be set according to requirements of the traction substation ground grid and the construction method thereof, and need to meet an industrial standard, which is neither described nor limited in this embodiment of the present disclosure.
The method for constructing the grounding grid of the railway traction substation in the highland and mountainous areas, provided by the embodiment of the disclosure, can effectively solve the problem of constructing the grounding grid of the traction substation under the topographic and geological conditions of the plateau and mountainous areas, and has the advantages of economy, reasonableness, strong adaptability and good long-term stability.
On the basis of the above embodiment, the embodiment of the present disclosure further provides a grounding grid for a railway traction substation in a highland and mountainous area, where the grounding grid can be constructed by any one of the construction methods provided in the above embodiment. Therefore, the grounding grid also has the beneficial effects of the construction method in the above embodiment, and the same points can be understood by referring to the explanation of the construction method in the above, and the details are not repeated below.
Fig. 2 is a schematic structural diagram of a high altitude and mountain area traction substation grounding grid according to an embodiment of the present disclosure, and fig. 3 is a schematic structural diagram of another high altitude and mountain area traction substation grounding grid according to an embodiment of the present disclosure. Referring to fig. 2 or 3, the ground net includes: the three-dimensional grounding grid 10 is formed by at least three layers of grounding grids, and the three-dimensional grounding grid 10 is associated with the soil model 00; wherein, at least one layer of grounding grid is positioned on the auxiliary layer, at least one layer of grounding grid is positioned on the filling layer and is used as an equipment grounding grid, and at least one layer of grounding grid is positioned between the equipment grounding grid and the grounding grid in the auxiliary layer, and the adjacent layers of grounding grids are electrically connected; the three-dimensional grounding grid meets the grounding requirement.
Exemplarily, fig. 2 only exemplarily shows that the stereo grounding grid 10 includes four layers of grounding grids, namely a bottom layer grounding grid 11, a first middle layer grounding grid 121, a second middle layer grounding grid 122 and a top layer grounding grid 13; exemplarily, fig. 3 shows that the three-dimensional grounding grid 10 includes three layers of grounding grids, namely a bottom layer grounding grid 11, a single layer of middle layer grounding grid 12 and a top layer grounding grid 13; in other embodiments, the number of layers of the ground grid may also be set according to the requirement of the ground grid, which is not limited in this disclosure.
In one embodiment, the density of the meshes of the counterpoise increases in the direction of the auxiliary layer towards the filling layer.
Wherein, the density increase of mesh, the area of contact of earth mat and soil increases to be favorable to realizing leading electric charge to ground, thereby be favorable to promoting the ground connection effect.
The grounding grid of the traction substation in the highland and mountainous areas and the construction method thereof provided by the embodiment of the disclosure form a set of complete and effective grounding grid construction method from the establishment of a soil model to the checking of performance indexes of a three-dimensional grounding grid aiming at the features of topography, terrain, geology and the like of railways in the highland and mountainous areas; meanwhile, a layered and distributed cage-shaped three-dimensional grounding network structure is provided, which can be fit for the characteristics of highlands and mountain railways; thirdly, because an engineering method is adopted, the whole three-dimensional grounding network is constructed from the structure and the shape, and the traditional resistance reducing measures such as resistance reducing agent, ion grounding electrode, deep well grounding and the like are not adopted, the timeliness problem can be improved, and the grounding network can be operated stably and reliably for a long time; finally, the three-dimensional grounding grid can be made of conventional grounding materials, so that the three-dimensional grounding grid is far superior to resistance reducing agents, ion grounding electrodes, deep well grounding and other resistance reducing measures in economy on the premise of achieving the same grounding effect, and cost reduction is facilitated.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for constructing a grounding grid of a railway traction substation in a plateau mountain area is characterized by comprising the following steps:
building a soil model of a traction substation with high fill and frozen plateau soil, and dividing the soil model into at least three soil layers; the at least three soil layers comprise at least one frozen soil layer, at least one filling layer positioned on the upper side of the frozen soil layer and at least one auxiliary layer positioned on the lower side of the frozen soil layer;
determining the ground short-circuit current of the traction substation;
establishing a layered and distributed three-dimensional grounding network; the three-dimensional grounding grid comprises at least three layers of grounding grids, wherein at least one layer of grounding grid is positioned on the auxiliary layer, at least one layer of grounding grid is positioned on the filling layer and is used as an equipment grounding grid, at least one layer of grounding grid is positioned between the equipment grounding grid and the grounding grid in the auxiliary layer, and the adjacent layers of grounding grids are electrically connected;
Judging whether the three-dimensional grounding grid meets grounding requirements or not based on the grounding short-circuit current and grounding grid parameters of the three-dimensional grounding grid;
and if not, adjusting the three-dimensional grounding grid until the grounding requirement is met.
2. The method of constructing as claimed in claim 1, wherein dividing the soil model into at least three soil layers comprises:
and performing equivalent treatment on the soil model according to horizontal layering, and dividing the soil model into at least three soil layers according to the resistivity of the soil.
3. The construction method according to claim 2, wherein before building a soil model of a traction power substation with high fill and plateau frozen soil and dividing the soil model into at least three soil layers, the method further comprises:
the method comprises the steps of obtaining a terrain model of high fill and plateau frozen soil, and determining the resistivity of the soil at each position in the terrain model.
4. The construction method according to claim 1, wherein the determining the incoming short circuit current of the traction substation comprises:
and calculating a shunt coefficient based on the system short-circuit capacity, the grounding resistance and the external power supply circuit model of the traction substation, and determining the grounding short-circuit current of the traction substation.
5. The construction method according to claim 1, wherein each layer of the earth screen is made of a metal conductor material, and adjacent layers of the earth screens are electrically connected by the metal conductor.
6. The construction method according to claim 1, wherein the manner of adjusting the stereo grounding grid comprises at least one of:
expanding the laying area of at least one layer of the ground net;
increasing the depth of the counterpoise in the auxiliary layer; and
and increasing the layer number of the ground net.
7. The build method of claim 1, wherein meeting a grounding requirement comprises: the ground resistance, ground potential and step potential all satisfy the safe threshold range.
8. A grounding grid of a railway traction substation in a plateau mountain area, which is constructed by applying the construction method of any one of claims 1 to 7, and comprises:
the three-dimensional grounding grid is formed by at least three layers of grounding grids and is associated with the soil model; wherein, at least one layer of grounding grid is positioned on the auxiliary layer, at least one layer of grounding grid is positioned on the filling layer and is used as an equipment grounding grid, and at least one layer of grounding grid is positioned between the equipment grounding grid and the grounding grid in the auxiliary layer, and the adjacent layers of grounding grids are electrically connected; the three-dimensional grounding grid meets the grounding requirement.
9. A grounding grid as claimed in claim 8, characterized in that the density of the meshes of the grid increases successively in the direction of the auxiliary layer towards the filling layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010596638.1A CN111859583A (en) | 2020-06-28 | 2020-06-28 | Grounding grid of railway traction substation in plateau mountain area and construction method thereof |
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