CN112580697B - Power transmission line tower grounding selection method and system - Google Patents
Power transmission line tower grounding selection method and system Download PDFInfo
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Abstract
The invention discloses a method and a system for selecting the grounding of a transmission line tower, comprising the following steps: constructing a grounding rule database, wherein the grounding rule database comprises grounding materials and grounding patterns under different soil types, the grounding materials comprise metallic grounding materials and nonmetallic grounding materials, and the grounding patterns comprise vertical grounding, epitaxial grounding, deep well grounding, blasting grounding and leading grounding; and judging the soil type by adopting a pre-constructed soil identification model to the soil sample set to be tested, and matching the grounding selection mode of the transmission line tower under the current soil condition in a grounding rule database according to the soil type. The grounding rule database constructed by the invention realizes that a specific grounding method is adopted under specific soil conditions and specific areas so as to effectively reduce the grounding resistance.
Description
Technical Field
The invention relates to the technical field of lightning protection grounding of a power transmission line, in particular to a grounding selection method and system for a power transmission line tower.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The grounding grid of the power station or the transformer substation is an important component in the actual construction engineering of the power system, is closely related to the long-term normal safe operation of the transformer substation, and because the geological conditions of different positions are greatly different, the grounding grid grounding design method is directly related to the personal safety of staff in the station and the safety of various electrical equipment, so that the grounding grid with reasonable price ratio is designed according to local conditions, and has stronger engineering practical significance and better economic value.
The tower grounding grid is used as the most basic lightning protection facility of the power transmission line, and the power frequency grounding resistance of the limiting tower grounding grid is a key for reducing the overvoltage of the tower top and preventing the insulator from causing the surface flashover due to counterattack. Because the transmission line towers span different terrains, landforms and geological areas, the uniform grounding resistance reduction strategy of the tower grounding network cannot be adopted in different areas; at present, the grounding materials and the grounding types of the grounding materials in the market are more, how to select proper grounding materials and grounding types in actual work, and how to select a power transmission line tower grounding selection method for effectively reducing the grounding resistance of a line according to specific conditions, specific areas and specific soil conditions are important problems to be solved.
Disclosure of Invention
In order to solve the problems, the invention provides a grounding selection method and a system for a transmission line tower, and the constructed grounding rule database realizes that a specific grounding method is adopted under specific soil conditions and specific areas so as to effectively reduce the grounding resistance.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for selecting a grounding of a tower of a power transmission line, including:
constructing a grounding rule database, wherein the grounding rule database comprises grounding materials and grounding patterns under different soil types, the grounding materials comprise metal grounding materials and nonmetal grounding materials, and the grounding patterns comprise vertical grounding, epitaxial grounding, deep well grounding, blasting grounding and leading-out grounding;
and judging the soil type by adopting a pre-constructed soil identification model to the soil sample set to be tested, and matching the grounding selection mode of the transmission line tower under the current soil condition in a grounding rule database according to the soil type.
In a second aspect, the present invention provides a transmission line tower grounding selection system, including:
the system comprises a database construction module, a data base construction module and a data base management module, wherein the grounding rule database comprises grounding materials and grounding patterns under different soil types, the grounding materials comprise metal grounding materials and nonmetal grounding materials, and the grounding patterns comprise vertical grounding, epitaxial grounding, deep well grounding, blasting grounding and leading-out grounding;
the grounding mode matching module is used for judging the soil type of the soil sample set to be detected by adopting a pre-constructed soil identification model, and matching the grounding selection mode of the transmission line tower under the current soil condition in the grounding rule database according to the soil type.
In a third aspect, the invention provides an electronic device comprising a memory and a processor and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform the method of the first aspect.
In a fourth aspect, the present invention provides a computer readable storage medium storing computer instructions which, when executed by a processor, perform the method of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
according to different geological conditions, factors such as construction convenience, resistance reduction effect, operation maintenance cost, land-feature cost and the like are comprehensively considered, and the grounding selection method and system for the transmission line tower are provided, so that the maximum degree of resistance reduction of the transmission line tower in grounding is realized, and a specific grounding method is adopted under specific soil conditions and specific areas, so that the grounding resistance is effectively reduced.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a flowchart of a method for selecting a grounding of a power transmission line tower according to embodiment 1 of the present invention.
The specific embodiment is as follows:
the invention is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms also are intended to include the plural forms, and furthermore, it is to be understood that the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, processes, methods, systems, products or devices that comprise a series of steps or units, are not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or inherent to such processes, methods, products or devices.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment provides a power transmission line tower grounding selection method and system, and provides an optimal power transmission line tower grounding resistance reduction selection method by comprehensively considering factors such as construction convenience, resistance reduction effect, operation maintenance cost, land-feature cost and the like according to different geological conditions. The current resistance reducing measures have specific conditions for application, and different methods are adopted aiming at different areas and different soil conditions, so that the grounding resistance can be effectively reduced. Specific:
(1) Different grounding materials and characteristics thereof;
(1-1) metallic grounding Material
The metallic grounding material comprises stainless steel, galvanized steel, copper-clad steel, pure copper and the like, and is used as a main material in a grounding grid of a power transmission line, and has the advantages of high mechanical strength, low price (except pure copper) and multiple purchase ways, and has the main defects of high transportation and construction difficulty, easy occurrence of theft and easy occurrence of corrosion.
Practical operation experience shows that the metallic grounding material corrodes faster, and serious corrosion occurs after 3-7 years of general operation, and pure copper has strong corrosion resistance but poor economy; the relative conductivity and magnetic permeability of the metallic material are larger, the effective cross-sectional area of the current is smaller due to the effect of the skin effect, the higher the current frequency is, the more obvious the skin effect is, and the utilization rate of the conductor material is not high. Under non-ideal topography (ridge, cliff etc.), because metal grounding material hardness is big, is difficult for following topography reasonable layout, and easily forms the air gap because of external force deformation with soft soil colloid, and the earthing effect is variation, and the grounding body is more easily corroded.
(1-2) nonmetallic earthing material
For the long-term corrosion problem of metallic grounding materials, nonmetallic grounding materials including graphite grounding modules, flexible graphite grounding bodies, ion grounding bodies, graphene alloy grounding bodies and the like are presented.
The nonmetallic material has the advantages of good conductivity and corrosion resistance, the relative conductivity and magnetic permeability of the nonmetallic material are close to 1, and the conductor utilization rate of the nonmetallic grounding material is higher under high-frequency current compared with the metallic grounding material.
The corrosion resistance of the graphite composite grounding material under the soil conditions of acid, alkali, salt and the like is far better than that of the metal grounding material, and the phenomenon of internal metal corrosion of the grounding module can occur due to the penetration of moisture and air.
The flexible graphite composite grounding body has the advantages of corrosion resistance, flexibility, low price, convenient installation, theft prevention and the like, and has the defects of lower mechanical strength and easy damage.
The ion grounding body has the defects of fragility, easy occurrence of cracking or breaking phenomenon in the transportation and carrying processes and even in the installation process, and the resistance value can be changed along with the humidity and temperature of soil.
The graphene alloy grounding material has the main advantages of high hardness, corrosion resistance, high conductivity, no welding in installation, long service life, complex processing technology and high price.
(2) The conventional grounding pattern is generally of the following 3 types:
(2-1) epitaxial grounding; the construction conditions are limited due to factors such as topography, soil quality and the like.
(2-2) vertically; the construction is convenient and fast, and the method is suitable for the transmission line towers with limited external construction such as complex topography, difficult land characterization and the like; the vertical resistance reduction efficiency is relatively high, but the single construction cost required by the vertical ground is high, and the resistance reduction effect is easily reduced due to the influence of factors such as shielding effect among a plurality of grounding bodies, a soil layered structure and the like.
(2-3) auxiliary resistance-reducing materials (resistance-reducing agent and grounding module) have the defects of low resistance-reducing efficiency, poor resistance-reducing long-acting property, acceleration of corrosion of metal grounding body and the like.
In recent years, related researches sequentially propose methods for reducing the grounding resistance of a deep well, a long vertical grounding body, blasting grounding, a low-resistance module, expanding the area of a grounding grid, increasing the buried depth of the grounding grid, partially replacing soil, adopting a resistance reducing agent, leading to grounding and the like; specifically:
(1) Increasing ground screen area
The ground resistance can be reduced by enlarging the land occupation area of the horizontal grounding grid, enlarging the scattered surface area of the grounding conductor or enlarging the number of vertical grounding poles, and meanwhile, the method needs to consider the utilization coefficient of the conductor, and the number and the length of the conductor need to be optimally configured; however, this method requires an excessive increase in the area of the ground, and increases the cost. Therefore, the ground resistance can be reduced only by the ground by enlarging the area of the ground net, and the method is suitable for the soil condition with uniform soil condition and unlimited occupied area.
(2) Increasing the buried depth of the ground net
Engineering application practices show that the resistance reducing effect of the method for increasing the buried depth of the grounding grid in areas with dry weather and high soil resistivity is not obvious, and especially the ground resistance can be increased due to the increase of the buried depth, so that the buried depth of the grounding grid is generally 0.6-0.8m.
(3) Deep well grounding
When the soil resistivity of the deeper underground is lower, a deep well grounding mode can be adopted to reduce the grounding resistance. The resistivity of the soil is typically non-uniform along the depth profile, with different depths yielding different resistivities; the resistivity within a few meters near the ground is generally unstable, the resistivity of the soil is more stable when the soil is deeper and the resistivity is more stable along with the change of seasons and climates, and particularly in areas with high soil resistivity and the grounding device can not be buried by adopting a conventional method, the grounding resistance can be effectively reduced by adopting the deep well grounding and the main grounding grid in parallel connection.
In the place with underground water-bearing layer, the grounding body may penetrate deep into the water layer, so that its resistance-reducing effect is obvious, and at the same time, the disadvantage of narrow field can be overcome due to deep well grounding mode.
(4) Blasting ground
The blasting grounding technology adopts a pressing machine to press the low-resistivity material into the blasting cracks through blasting crack making, so that the conductivity of the soil in a large range is improved, and the blasting grounding technology is equivalent to soil transformation in a large range.
The method is different from deep well grounding, after a drilling machine drills a deep hole, firstly, blasting is carried out to form rock cracks around the deep hole, then a pressing machine is used for pressing low-resistivity materials into the deep hole, and finally, a vertical grounding electrode is buried and connected with a horizontal grounding grid.
(5) Local soil replacement
The adoption of soil with lower soil resistivity to replace soil with higher soil resistivity around a grounding conductor is one of effective methods for reducing the grounding resistance of a grounding grid; the specific method comprises the following steps:
by replacing the upper part of the grounding body by 1/3 length, mixing soil with 0.6m around or mixing soil with better conductivity or industrial waste in 2-3m around the grounding body, the method can reduce the resistivity of the soil by 10-20%, but the method has to be compared comprehensively from the technical economy to avoid economic waste.
(6) By adopting comprehensive resistance-reducing measures
For a grounding project, a resistance reducing measure is adopted, so that the grounding resistance cannot be reduced to a qualified range, and various resistance reducing measures are often needed to reduce the resistance, such as an epitaxial grounding resistance increasing and reducing module, a deep well grounding resistance increasing and reducing module and the like.
Aiming at the situation that the soil resistivity is larger than 100 omega-m and a manual grounding device is additionally arranged, according to different geological conditions, factors such as construction convenience, resistance reduction effect, operation maintenance cost, land feature cost and the like are comprehensively considered, and the optimal selection method for grounding of the transmission line tower is provided; as shown in fig. 1, the method specifically includes:
s1: constructing a grounding rule database, wherein the grounding rule database comprises grounding materials and grounding patterns under different soil types, the grounding materials comprise metallic grounding materials and nonmetallic grounding materials, and the grounding patterns comprise vertical grounding, epitaxial grounding, deep well grounding, blasting grounding and leading grounding;
in the step S1, the grounding rule in the grounding rule database is specifically:
s1-1: under uniform soil conditions:
judging whether the soil contains special chemical corrosion elements or not and whether the soil belongs to the soil easy to corrode or not;
if no special chemical corrosion element exists, judging whether the grounding material belongs to the land and the green seedling compensation difficult area, if not, selecting a metallic grounding material as the grounding material, and selecting an epitaxial grounding mode as the grounding material; otherwise, the grounding material is selected to be metallic, and the grounding type is selected to be vertical;
if the special chemical corrosion elements exist, judging whether the special chemical corrosion elements belong to the land and the green seedling compensation difficult areas, if not, selecting nonmetallic grounding materials such as a flexible graphite grounding body and a graphite grounding module as grounding types, and selecting epitaxial grounding; otherwise, the grounding material is graphene grounding material, and the grounding type is vertical.
S1-2: under the soil layering condition:
acquiring the resistivity of the bottom layer soil, presetting a resistivity threshold, and if the resistivity of the bottom layer soil is lower than the resistivity threshold, if a soil layer with lower resistivity such as underground water exists on the bottom layer, when a ground body vertically touches the soil layer, reducing the grounding resistance in a step-type manner; therefore, the grounding material is selected from metallic grounding materials such as galvanized steel or copper-clad steel, and the grounding type adopts deep well grounding;
if the bottom layer soil resistivity is higher than the resistivity threshold, such as sand, rock and the like with high soil resistivity, the vertical grounding is not easy to be adopted, and the grounding method is consistent with the grounding mode under the condition of uniform soil.
Preferably, the method for acquiring the resistivity of the bottom soil comprises the following steps: and selecting N test points, wherein the soil density of the test points at the leading line of the grounding grid is greater than that of the test points at other positions of the grounding grid, and calculating the average soil resistivity of the grounding grid by adopting a weighted average method.
S1-3: under the hilly conditions in mountainous areas:
judging whether the land is a multi-rock mountain area, if not, selecting a nonmetallic grounding material as a grounding material, and selecting a grounding type with properly enlarged grounding area as a grounding type;
if the ground area is increased and the construction difficulty is too high, the grounding type is selected to be blasted to ground or to be locally changed, and if the low-resistance area is arranged within the distance of 1.5 times of the length of the grounding body, the grounding type is selected to be conducted to ground; the grounding material is selected from nonmetallic grounding materials.
In this embodiment, step S2: and judging the soil type by adopting a pre-constructed soil identification model to the soil sample set to be tested, and matching the grounding selection mode of the transmission line tower under the current soil condition in a grounding rule database according to the soil type.
Specifically, the soil identification module is used for acquiring soil characteristic data, such as geographic position, depth, soil body, acid, alkali, salt, humidity, temperature, soil resistivity, corrosion rate and the like, acquiring a soil type and a soil environment corresponding to the soil characteristic data, constructing a training set, training an SVM classifier, and identifying a soil sample set to be tested by using the trained SVM classification model to obtain the soil type of the soil sample set to be tested, wherein the soil type comprises a uniform soil environment, a soil layering environment and a mountain and hilly environment.
In this embodiment, the method further includes judging whether the soil to be tested belongs to the soil susceptible to corrosion according to the resistivity of the soil and the natural potential around the soil;
measuring the resistivity and the natural potential of the soil by adopting a copper sulfate reference electrode; in the common case, the smaller the resistivity of the soil is, the larger the negative value of the natural potential of the surrounding environment is, and the stronger the corrosiveness of the soil is.
In this embodiment, the method further includes determining whether the soil to be detected belongs to a land and a green seedling compensation difficult region according to the geographical location, soil mass, depth and the like of the soil.
In this embodiment, the method further includes determining whether the area where the soil to be measured is located is a multi-rock mountain area according to the weathering degree of the rock around the soil.
In this embodiment, according to the identification and judgment result of the soil to be tested, the grounding mode suitable for the current soil condition is screened out through matching with the grounding materials and the grounding patterns in the grounding rule database, so as to maximally realize the grounding resistance reduction of the transmission tower.
Example 2
The embodiment provides a transmission line tower ground selection system, including:
the system comprises a database construction module, a data base construction module and a data base management module, wherein the grounding rule database comprises grounding materials and grounding patterns under different soil types, the grounding materials comprise metallic grounding materials and nonmetallic grounding materials, and the grounding patterns comprise vertical grounding, epitaxial grounding, deep well grounding, blasting grounding and leading-out grounding;
the grounding mode matching module is used for judging the soil type of the soil sample set to be detected by adopting a pre-constructed soil identification model, and matching the grounding selection mode of the transmission line tower under the current soil condition in the grounding rule database according to the soil type.
It should be noted that the above modules correspond to the steps described in embodiment 1, and the above modules are the same as examples and application scenarios implemented by the corresponding steps, but are not limited to those disclosed in embodiment 1. It should be noted that the modules described above may be implemented as part of a system in a computer system, such as a set of computer-executable instructions.
In further embodiments, there is also provided:
an electronic device comprising a memory and a processor and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform the method described in embodiment 1. For brevity, the description is omitted here.
It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate array FPGA or other programmable logic device, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include read only memory and random access memory and provide instructions and data to the processor, and a portion of the memory may also include non-volatile random access memory. For example, the memory may also store information of the device type.
A computer readable storage medium storing computer instructions which, when executed by a processor, perform the method described in embodiment 1.
The method in embodiment 1 may be directly embodied as a hardware processor executing or executed with a combination of hardware and software modules in the processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method. To avoid repetition, a detailed description is not provided herein.
Those of ordinary skill in the art will appreciate that the elements of the various examples described in connection with the present embodiments, i.e., the algorithm steps, can be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. The power transmission line pole tower grounding selection method is characterized by comprising the following steps of:
constructing a grounding rule database, wherein the grounding rule database comprises grounding materials and grounding patterns under different soil types, the grounding materials comprise metal grounding materials and nonmetal grounding materials, and the grounding patterns comprise vertical grounding, epitaxial grounding, deep well grounding, blasting grounding and leading-out grounding;
judging the soil type by adopting a pre-constructed soil identification model for the soil sample set to be tested, and matching the grounding selection mode of the transmission line tower under the current soil condition in a grounding rule database according to the soil type;
judging whether the mountain area hilly soil belongs to a multi-rock mountain area or not when the soil type is the mountain area hilly soil, and if not, selecting a nonmetal grounding material as a grounding material, and selecting a grounding type with an increased grounding area as a grounding type; if the material belongs to a multi-rock mountain area, the grounding material is a nonmetal grounding material, and the grounding type is blasting grounding or local soil replacement; if a low-resistance area exists within a distance which is 1.5 times of the length of the grounding body, the grounding type is selected to lead to the grounding;
the soil identification model is used for acquiring soil characteristic data and soil types and soil environments corresponding to the soil characteristic data, constructing a training set, training an SVM classifier, and identifying a soil sample set to be tested by using the trained SVM classification model to obtain the soil types of the soil sample set to be tested, wherein the soil types comprise uniform soil environments, soil layering environments and mountain and hilly environments; the soil characteristic data comprise geographic position, depth, soil mass, acid, alkali, salt, humidity, temperature, soil resistivity and corrosion rate;
further comprises: judging whether the soil to be detected belongs to the soil easy to corrode or not according to the soil resistivity and the natural potential around the soil; judging whether the soil to be detected belongs to a land reclamation difficulty region or not according to the geographical position, soil mass and depth of the soil; judging whether the area where the soil to be measured is located is a multi-rock mountain area or not according to the weathering degree of rocks around the soil;
the method for acquiring the resistivity of the bottom soil comprises the following steps: and selecting N test points, wherein the soil density of the test points at the leading line of the grounding grid is greater than that of the test points at other positions of the grounding grid, and calculating the average soil resistivity of the grounding grid by adopting a weighted average method.
2. The method for selecting the grounding of the transmission line tower according to claim 1, wherein when the soil type is uniform soil, judging whether a soil sample set to be detected belongs to corrosion-prone soil, if not, selecting a metal grounding material as a grounding material, and selecting an epitaxial grounding mode; or the grounding material is selected from metal grounding material, and the grounding type is selected from vertical grounding.
3. The transmission line tower grounding selection method according to claim 2, wherein if the soil sample set to be detected belongs to the corrosion-prone soil, the grounding material is selected from a nonmetallic grounding material, and the grounding type is selected from an epitaxial grounding; or the grounding material is selected from nonmetal grounding material, and the grounding type is selected to be vertically grounded.
4. The method for selecting the grounding of a transmission line tower according to claim 1, wherein when the soil type is layered soil, if the resistivity of the soil at the bottom layer is lower than a resistivity threshold, the grounding material is a metal grounding material, and the grounding pattern is a deep well grounding.
5. The transmission line tower grounding selection method according to claim 4, wherein the grounding method is consistent with the grounding method of uniform soil if the bottom soil resistivity is higher than the resistivity threshold.
6. A transmission line tower ground selection system, comprising:
the system comprises a database construction module, a data base construction module and a data base management module, wherein the grounding rule database comprises grounding materials and grounding patterns under different soil types, the grounding materials comprise metal grounding materials and nonmetal grounding materials, and the grounding patterns comprise vertical grounding, epitaxial grounding, deep well grounding, blasting grounding and leading-out grounding;
the grounding mode matching module is used for judging the soil type of the soil sample set to be detected by adopting a pre-constructed soil identification model, and matching the grounding selection mode of the transmission line tower under the current soil condition in the grounding rule database according to the soil type; judging whether the mountain area hilly soil belongs to a multi-rock mountain area or not when the soil type is the mountain area hilly soil, and if not, selecting a nonmetal grounding material as a grounding material, and selecting a grounding type with an increased grounding area as a grounding type; if the device belongs to a multi-rock mountain area, the grounding material is a nonmetal grounding material, and the grounding type is blasting grounding, leading to grounding or local soil replacement;
the soil identification model is used for acquiring soil characteristic data and soil types and soil environments corresponding to the soil characteristic data, constructing a training set, training an SVM classifier, and identifying a soil sample set to be tested by using the trained SVM classification model to obtain the soil types of the soil sample set to be tested, wherein the soil types comprise uniform soil environments, soil layering environments and mountain and hilly environments; the soil characteristic data comprise geographic position, depth, soil mass, acid, alkali, salt, humidity, temperature, soil resistivity and corrosion rate;
further comprises: judging whether the soil to be detected belongs to the soil easy to corrode or not according to the soil resistivity and the natural potential around the soil; judging whether the soil to be detected belongs to a land reclamation difficulty region or not according to the geographical position, soil mass and depth of the soil; judging whether the area where the soil to be measured is located is a multi-rock mountain area or not according to the weathering degree of rocks around the soil;
the method for acquiring the resistivity of the bottom soil comprises the following steps: and selecting N test points, wherein the soil density of the test points at the leading line of the grounding grid is greater than that of the test points at other positions of the grounding grid, and calculating the average soil resistivity of the grounding grid by adopting a weighted average method.
7. An electronic device comprising a memory and a processor and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform the method of any one of claims 1-5.
8. A computer readable storage medium storing computer instructions which, when executed by a processor, perform the method of any of claims 1-5.
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| CN113219001B (en) * | 2021-04-28 | 2022-06-17 | 国网天津市电力公司 | Grounding model selection method and device based on numerical algorithm |
| CN114824846B (en) * | 2022-05-19 | 2022-12-02 | 湖南经研电力设计有限公司 | Short conductor-based power transmission pole tower grounding method |
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