CN115728608A - Grounding device lightning impulse current dissipation performance evaluation method, system and medium - Google Patents
Grounding device lightning impulse current dissipation performance evaluation method, system and medium Download PDFInfo
- Publication number
- CN115728608A CN115728608A CN202211465140.7A CN202211465140A CN115728608A CN 115728608 A CN115728608 A CN 115728608A CN 202211465140 A CN202211465140 A CN 202211465140A CN 115728608 A CN115728608 A CN 115728608A
- Authority
- CN
- China
- Prior art keywords
- impulse
- grounding
- resistance
- subsequent
- impact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a method, a system and a medium for evaluating lightning impulse current-dissipating performance of a grounding device, which are used for acquiring environmental parameters and impulse grounding resistance of the grounding device; calculating to obtain a subsequent impact coefficient based on the environmental parameters and in combination with the time interval of lightning impact; calculating to obtain a subsequent impact resistance based on the subsequent impact coefficient and the impact grounding resistance; respectively comparing the impulse grounding resistance and the subsequent impulse grounding resistance with a grounding resistance safety threshold, and predicting the safety performance of the grounding device based on the comparison result of the impulse grounding resistance and the subsequent impulse grounding resistance; the method has the advantages that the safety of the lightning impulse shedding performance of the grounding device is judged simultaneously through setting the subsequent impulse coefficient related to the lightning impulse times and the environmental factors and through the subsequent impulse resistance and the grounding impulse resistance calculated through the subsequent impulse coefficient, the error of the lightning impulse shedding performance evaluation of the grounding device can be reduced, and the accuracy of the evaluation result is improved.
Description
Technical Field
The invention relates to the technical field of high voltage and insulation, in particular to a method, a system and a medium for evaluating lightning impulse current dissipation performance of a grounding device.
Background
In a traditional method for evaluating the impact current-dissipating performance of a grounding system, an impact grounding resistance based on impact coefficient equivalence is usually adopted as an evaluation index, and the impact coefficient equivalence impact grounding resistance is multiplied by a power frequency grounding resistance of the grounding system. And comparing the calculated impulse grounding resistance with a standard threshold value, thereby judging whether the grounding device meets the safe grounding requirement. However, in actual operation, the grounding device meeting the regulation requirements still has the phenomenon that electrical equipment is damaged when lightning strikes the grounding device to dissipate current. This shows that the conventional evaluation method has a certain limitation, and one of the great differences from the actual situation is that the subsequent voltage rise phenomenon of the continuous impulse discharge is not considered.
The actual lightning has the characteristic of one-time breakdown and multiple-time discharge, in the continuous impact discharge process, an obvious discharge channel can be formed in the ground due to the preorder impact discharge, and when the time interval of the postimpact discharge is larger, the preorder impact discharge channel can be changed into a lightning rock high-resistance channel with a hollow air cavity, the postimpact discharge can be continuously accumulated and blocked, the postimpact grounding is further increased, and the postimpact voltage is raised.
Therefore, in the actual process of multiple lightning breakdown discharges, if the traditional method is continuously used, the impact current dissipation performance is evaluated without considering the subsequent voltage rise existing in the continuous impact discharge, so that the lightning current dissipation performance evaluation error of the grounding device is caused, and the evaluation result is inaccurate.
In view of this, the present application is specifically made.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, the lightning strike diffusion performance evaluation error of a grounding device is caused by evaluating the strike diffusion performance without considering the subsequent voltage rise existing in continuous strike discharge, and the evaluation result is inaccurate, and aims to provide a method, a system and a medium for evaluating the lightning strike diffusion performance of the grounding device, which can reduce the error of evaluating the lightning strike diffusion performance of the grounding device and improve the accuracy of the evaluation result.
The invention is realized by the following technical scheme:
a grounding device lightning impulse current dissipation performance evaluation method comprises the following steps:
acquiring environmental parameters and impulse grounding resistance of a grounding device;
calculating to obtain a subsequent impact coefficient based on the environmental parameters and in combination with the time interval of lightning impact;
calculating to obtain a subsequent impact resistance based on the subsequent impact coefficient and the impact grounding resistance;
and respectively comparing the impulse grounding resistance and the subsequent impulse grounding resistance with a grounding resistance safety threshold, and predicting the safety performance of the grounding device based on the comparison result of the impulse grounding resistance and the subsequent impulse grounding resistance.
When the lightning strike impact current dissipation performance of the grounding device is evaluated conventionally, the equivalent impact grounding resistance based on an impact system is usually adopted as an evaluation index for evaluation, but when the grounding device is evaluated by adopting the method, the subsequent voltage rise existing in continuous impact discharge is not considered for evaluating the impact current dissipation performance, so that the lightning strike current dissipation performance evaluation error of the grounding device is caused, and the evaluation result is inaccurate; the invention provides a lightning impulse streaming performance evaluation method for an earthing device, which can reduce errors of lightning impulse streaming performance evaluation on the earthing device and improve the accuracy of evaluation results by setting subsequent impact coefficients related to the number of lightning impulses and environmental factors and simultaneously judging the safety of the lightning impulse streaming performance of the earthing device through subsequent impact resistance and earthing impact resistance calculated by the subsequent impact coefficients.
Preferably, the method for acquiring the impulse grounding resistance comprises the following steps:
the impact grounding resistance is obtained by obtaining the impact coefficient of the grounding device and the power frequency grounding resistance and carrying out product operation on the impact coefficient and the power frequency grounding resistance.
Preferably, the environmental parameters include earth electrode structure and soil resistivity and soil type moisture content.
Preferably, the specific expression of the subsequent impact coefficient is as follows:
α 2 ＝f(x i )＝f(P，x 1 ，x 2 ，…)
α 2 for subsequent impact coefficient, b, c are fitted environment parameter constants, f (x) i ) For a comprehensive characterization function of a plurality of factors, x i Is the influence parameter of the ith factor, and P is a probabilistic occurrence factor.
Preferably, the specific expression of the subsequent impact resistance is as follows:
R 2 ＝α 2 ×R 1 ＝α 2 α 1 ×R 0
R 2 for subsequent impulse resistance, alpha 2 For subsequent impact coefficient, R 0 Is a power frequency ground resistance, alpha 1 Is the coefficient of impact, R 1 For impulse ground resistance, T is the real-time lightning interval time, T 0 For successive time intervals of lightning strikes.
Preferably, in comparing the impulse grounding resistance and the subsequent impulse grounding resistance with a safety threshold, the specific comparison and the corresponding prediction result expression are as follows:
impact performance
R s Is a safe threshold value of the grounding resistance.
The invention also provides a system for evaluating the lightning impulse current-dissipating performance of the grounding device, which comprises a parameter acquisition module, a first calculation module, a second calculation module and a comparison and judgment module;
the parameter acquisition module is used for acquiring environmental parameters and impulse grounding resistance of the grounding device;
the first calculation module is used for calculating and obtaining a subsequent impact coefficient based on the environment parameters and in combination with the time interval of lightning impact;
the second calculation module is used for calculating and obtaining a subsequent impact resistance based on the subsequent impact coefficient and the impact grounding resistance;
and the comparison and judgment module is used for respectively comparing the impulse grounding resistance and the subsequent impulse grounding resistance with a grounding resistance safety threshold value and predicting the safety performance of the grounding device based on the comparison result of the impulse grounding resistance and the subsequent impulse grounding resistance.
Preferably, in the parameter obtaining module, the obtaining of the impulse grounding resistance is: and obtaining the impact grounding resistance by obtaining the impact coefficient of the grounding device and the power frequency grounding resistance and performing product operation on the impact coefficient and the power frequency grounding resistance.
Preferably, the environmental parameters include earth electrode structure, soil resistivity, soil type moisture content.
The invention also provides a computer storage medium having a computer program stored thereon, which, when executed by a processor, implements a method as described above.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the method, the system and the medium for evaluating the lightning impulse streaming performance of the grounding device, provided by the embodiment of the invention, the safety of the lightning impulse streaming performance of the grounding device is simultaneously judged by setting the subsequent impact coefficient related to the lightning impulse times and the environmental factors and calculating the subsequent impact resistance and the grounding impact resistance according to the subsequent impact coefficient, so that the error of evaluating the lightning impulse streaming performance of the grounding device can be reduced, and the accuracy of an evaluation result is improved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that those skilled in the art may also derive other related drawings based on these drawings without inventive effort.
FIG. 1 is a schematic diagram of an evaluation method;
FIG. 2 is a graph of the ratio of the subsequent impulse resistance to the first impulse resistance as a function of time interval.
Detailed Description
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.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the invention.
Example one
When the lightning strike impact current dissipation performance of a grounding device is evaluated conventionally, an impact grounding resistance based on the equivalent of an impact system is usually adopted as an evaluation index for evaluation, the impact grounding resistance is equal to the product of a power frequency grounding resistance and an impact coefficient, and the product is compared with a safety threshold of the grounding resistance for evaluation. When the impulse grounding resistance value is larger than the safety threshold value, the grounding design is considered to have safety problems, otherwise, the safety design is considered to meet the requirements. However, when the method is used for evaluating the grounding device, the impact current dissipation performance is evaluated without considering the subsequent voltage rise existing in continuous impact discharge, so that the lightning current dissipation performance evaluation error of the grounding device is caused, and the evaluation result is inaccurate.
The embodiment discloses a method for evaluating lightning impulse streaming performance of an earthing device, which is characterized in that the safety of the lightning impulse streaming performance of the earthing device is judged simultaneously through setting subsequent impact coefficients related to the number of lightning impulses and environmental factors and through subsequent impact resistance and earthing impact resistance calculated through the subsequent impact coefficients, so that the error of evaluating the lightning impulse streaming performance of the earthing device can be reduced, and the accuracy of an evaluation result is improved. The specific evaluation method in this embodiment is shown in fig. 1, and the method includes the steps of:
s1: acquiring environmental parameters and impulse grounding resistance of a grounding device;
the method for acquiring the impulse grounding resistance comprises the following steps: the impact grounding resistance is obtained by obtaining the impact coefficient of the grounding device and the power frequency grounding resistance and carrying out product operation on the impact coefficient and the power frequency grounding resistance. The environmental parameters include the structure of the earth electrode, the resistivity of the soil, the water content of the soil type and the like.
In step S1, the grounding device is set with environmental parameters, and the environmental parameters will affect the grounding device after long-term operation, so in this embodiment, the environmental factors are obtained and comprehensively calculated in consideration of the influence of the environmental factors on the grounding device during long-term operation of the grounding device.
S2: calculating to obtain a subsequent impact coefficient based on the environmental parameters and in combination with the time interval of lightning impact; the subsequent impact coefficient is used as a new supplementary evaluation parameter of the soil impact current dispersion performance, so that the change condition of the subsequent impact grounding resistance caused by continuous impact can be quantitatively represented, and the subsequent impact voltage lifting condition is further reflected. Meanwhile, the subsequent impact coefficient is used as a supplementary improvement index, and the method can be completely matched with the existing evaluation method for calculating the impulse grounding resistance based on the impact coefficient, can improve the evaluation precision, can be conveniently popularized, and cannot be disjointed with a common method.
When the continuous impact time interval is shorter, the subsequent impact coefficient rises exponentially along with the increase of the time interval. Because the subsequent impulse grounding resistance value can be regarded as the first impulse grounding resistance multiplied by the subsequent impulse coefficient, when the time interval is small, the subsequent impulse grounding resistance exponentially rises and approaches to 1 along with the increase of the time interval, when the time interval is large, the subsequent impulse coefficient is larger than 1 along with the increase of the time interval, and therefore the subsequent impulse coefficient is defined as a piecewise function, and the specific expression of the subsequent impulse coefficient is as follows:
α 2 ＝f(x i )＝f(P,x 1 ,x 2 ,…)
α 2 for subsequent impact coefficient, b, c are fitted environment parameter constants, f (x) i ) For a comprehensive characterization function of a plurality of factors, x i For variables affecting the subsequent impact coefficient, P is a probabilistic occurrence factor, T is the real-time lightning interval time, T 0 For successive time intervals of lightning strikes.
Wherein x 1 ～x i The influence of three aspects of medium, current and grounding electrode and various factors which are not researched in the text are respectively represented, and P represents a probabilistic occurrence factor: and the subsequent impact coefficient changes in a regular manner, and when the time interval is small, the subsequent impact coefficient increases exponentially along with the increase of the time interval to be a fixed condition. When the time interval is larger, the subsequent impact coefficient is related to various influence factors and has a probability, when the time interval exceeds a certain value, the subsequent impact coefficient is a probability function, and the larger the subsequent voltage rise proportion is, the smaller the probability of the occurrence is, namely, the concept of the maximum subsequent impact coefficient is provided. The specific rule is shown in fig. 2.
S3: calculating to obtain a subsequent impact resistance based on the subsequent impact coefficient and the impact grounding resistance;
the specific expression of the subsequent impact resistance is as follows:
R 2 ＝α 2 ×R 1 ＝α 2 α 1 ×R 0
R 2 for subsequent impulse resistance, alpha 2 For subsequent impact coefficient, R 0 Is a power frequency ground resistance, alpha 1 Is the coefficient of impact, R 1 Is a surge ground resistance.
S4: and respectively comparing the impulse grounding resistance and the subsequent impulse grounding resistance with a grounding resistance safety threshold, and evaluating the safety performance of the grounding device based on the comparison result of the impulse grounding resistance and the subsequent impulse grounding resistance.
In step S4, the early warning evaluation is performed on the grounding device through multiple stages of composite indexes, the impulse grounding resistance and the subsequent impulse grounding resistance are all used as evaluation indexes, and meanwhile, an early warning state is added to construct multiple stages of evaluation standards, so that the probability and the uncertain margin setting of the subsequent impulse voltage transient uplift are realized.
The judgment condition recursion process of each index is as follows: considering the influence of continuous impact on the impulse grounding resistance, each impulse grounding resistance under continuous impact is required to be smaller than the safety threshold value of grounding, namely the first impulse grounding resistance R 1 And then surge ground resistance R 2 Are all less than the safety threshold R in the standard s The method specifically comprises the following steps:
R 2 ＜R s ,R 1 ＜R s /α 2
because the subsequent impact coefficient is influenced by uncertain factors such as the number of lightning impacts and the like under the influence of the same factor, a value range is formed, so that in order to ensure that the grounding safety assessment conclusion is more reliable, the subsequent impact coefficient needs to be ensured to be taken as a severer maximum value alpha 2max And then, the impulse grounding resistance is still smaller than the safety threshold value, namely:
R 2max ＜R s ,R 1 ＜R s /α 2max
in the same time, in practical situations, there are variations due to environmental conditionsFor example, in a certain area, the water content and the resistivity of soil can change due to the four seasons alternation, the four seasons alternation can influence the change of lightning parameters, and the temperature, the soil modification and the like can also change the soil parameters. Therefore the subsequent impact coefficient alpha 2max Rather than being a fixed value, the subsequent impact coefficients measured at different time periods may be different for different seasons.
For this reason, we need to consider the most severe working environment in the evaluation, i.e. the very large subsequent impact coefficient α that may appear on a time scale under multiple factors, within the range of possible factor variations tmax According to the present study definition of α tmax =1.7. I.e. during the evaluation of the grounding, if R 1 .α 2max ＜R s But 1.7R 1 ＞R s It means that the grounding evaluation is qualified in a short time, but a safety problem may occur in a long-term operation. The maximum value of the subsequent impulse grounding resistance is R tmax ＝1.7R 1 。
In the evaluation method, the safety evaluation limit value is subdivided into multi-section evaluation, and two safety gear limit values R are set Q And R H . Order to
R Q ＝R s /1.7,R H ＝0.95R s
The specific determination condition is that if R 2 ＞R H ＝0.95R s And the grounding resistance value of the area can not meet the safety grounding requirement, because the lifting of the ground potential can threaten the safety of people and electrical equipment no matter how many times the ground net is struck by lightning, and therefore, the grounding safety is not qualified or unqualified at the moment.
When R is 1 ＞R Q ＝R S 1.7 and R 2 ＜R H ＝0.95R S In time, it can be determined that the grounding design meets the safe grounding requirements under this condition. However, if harsher conditions occur, R is tmax ＝1.7R 1 ＞R S And then, the condition indicates that the subsequent impulse grounding resistance of the converter station can not meet the safe grounding requirement under the strict condition or in the long-term operation.
Since the subsequent impact lifting phenomenon does not occur 100%, the mine is ready to useWhen electricity is dispersed through the grounding grid, the situation that the subsequent impulse grounding resistance does not meet the safety grounding requirement also occurs probabilistically, so the grounding is in the situation of safety early warning at the moment. So that 0.95R is selected S The reason is that in the actual evaluation, a certain margin needs to be left for the evaluation result, and the margin can be set to different values according to the actual situation.
When R is 1 ＜R Q ＝R S And 1.7, namely, the subsequent impulse grounding resistance of the region also meets the requirement of safe grounding, and the situation that the impulse grounding resistance is smaller than a safe threshold value every time when the multi-impulse lightning is subjected to current dissipation by the grounding grid can be determined, so that the grounding design meets the safe grounding condition at the moment.
To sum up, the specific expression of the grounding safety early warning based on the voltage rise is as follows:
impact performance
The specific implementation process comprises the following steps:
taking the vertical grounding pole as an example, in combination with parameters such as tower voltage class, the safety threshold of the impulse grounding resistance at this time is specified to be 30 Ω in the query procedure, that is, RS =30 Ω, and the impulse coefficient α _1=1.2. Investigation and investigation show that the local soil has 6% of water content, 0.5% of salt content, sand soil and vertical pole grounding pole. The experiment calculated α 2max =1.5 at this time. According to the parameters, when the power frequency grounding resistance is smaller than 14.58 omega, the grounding design is qualified, when the power frequency grounding resistance is larger than 14.58 omega and smaller than 15.83 omega, the grounding design is in an early warning state, and when the power frequency grounding resistance is larger than 15.83 omega, the grounding design is unqualified.
The key parameters of the ground impact characteristics for the different cases are shown in table one.
In case 1, the actual power frequency ground resistance is measured and calculated to be 7 Ω by a method such as a winner quadrupole method, that is, R0=7 Ω. It is calculated that the first impulse grounding resistance is 8.4 Ω and the subsequent impulse grounding resistance is 12.6 Ω. The initial impulse grounding resistance is less than 30/1.7=17.5 Ω, and the subsequent impulse grounding resistance is less than 30 × 0.95=28.5 Ω, so that the grounding grid is judged to be qualified according with the safety grounding standard.
If the field actual measurement result is the condition 2, the result is unqualified; and if the field actual measurement result is the condition 3, early warning is performed.
TABLE A continuous impact evaluation case analysis
According to the method for evaluating the lightning impulse streaming performance of the grounding device, the subsequent impact coefficient related to the number of lightning impulses and environmental factors is set, and the safety of the lightning impulse streaming performance of the grounding device is judged simultaneously through the subsequent impact resistance and the grounding impact resistance calculated through the subsequent impact coefficient, so that the error of evaluating the lightning impulse streaming performance of the grounding device can be reduced, and the accuracy of an evaluation result is improved.
Example two
The embodiment discloses a system for evaluating lightning impulse dissipation performance of a grounding device, and aims to realize the evaluation method in the embodiment, and the system comprises a parameter acquisition module, a first calculation module, a second calculation module and a comparison and judgment module;
the parameter acquisition module is used for acquiring environmental parameters and impulse grounding resistance of the grounding device;
the first calculation module is used for calculating and obtaining a subsequent impact coefficient based on the environment parameters and in combination with the time interval of lightning impact;
the second calculation module is used for calculating and obtaining a subsequent impact resistance based on the subsequent impact coefficient and the impact grounding resistance;
and the comparison and judgment module is used for comparing the impulse grounding resistance and the subsequent impulse grounding resistance with a grounding resistance safety threshold respectively and evaluating the safety performance of the grounding device based on the comparison result of the impulse grounding resistance and the subsequent impulse grounding resistance.
In the parameter obtaining module, the obtaining of the impulse grounding resistance is as follows: the impact grounding resistance is obtained by obtaining the impact coefficient of the grounding device and the power frequency grounding resistance and carrying out product operation on the impact coefficient and the power frequency grounding resistance.
The environmental parameters comprise a grounding electrode structure, soil resistivity and soil type water content.
EXAMPLE III
The present embodiment discloses a computer storage medium, on which a computer program is stored, which, when executed by a processor, implements the method according to the first embodiment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer programs may be provided to issue instructions to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program issue instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the issue instructions stored in the computer-readable memory produce an article of manufacture including issue instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program issue instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the issue instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
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 (10)
1. A method for evaluating lightning impulse dissipation performance of a grounding device is characterized by comprising the following steps:
acquiring environmental parameters and impulse grounding resistance of a grounding device;
calculating to obtain a subsequent impact coefficient based on the environmental parameters and in combination with the time interval of lightning impact;
calculating to obtain a subsequent impact resistance based on the subsequent impact coefficient and the impact grounding resistance;
and respectively comparing the impulse grounding resistance and the subsequent impulse grounding resistance with a grounding resistance safety threshold, and evaluating the safety performance of the grounding device based on the comparison result of the impulse grounding resistance and the subsequent impulse grounding resistance.
2. The method for evaluating lightning impulse dissipation performance of a grounding device according to claim 1, wherein the method for obtaining the impulse grounding resistance comprises the following steps:
the impact grounding resistance is obtained by obtaining the impact coefficient of the grounding device and the power frequency grounding resistance and carrying out product operation on the impact coefficient and the power frequency grounding resistance.
3. The method of claim 2, wherein the environmental parameters include ground electrode structure and soil resistivity and soil type moisture content.
4. The method for evaluating lightning impulse dissipation performance of a grounding device according to claim 1, wherein the specific expression of the subsequent impact coefficient is as follows:
α 2 ＝f(x i )＝f(P,x 1 ,x 2 ,…)
α 2 for subsequent impact coefficient, b, c are fitted environment parameter constants, f (x) i ) For a comprehensive characterization function of a plurality of factors, x i Is the influence parameter of the ith factor, P is a probabilistic occurrence factor, T is the real-time lightning interval time, T 0 For successive time intervals of lightning strikes.
5. The method for evaluating the lightning impulse current-dissipating performance of the grounding device according to claim 4, wherein the specific expression of the subsequent impulse resistance is as follows:
R 2 ＝α 2 ×R 1 ＝α 2 α 1 ×R 0
R 2 for subsequent impulse resistance, alpha 2 For subsequent impact coefficient, R 0 Is a power frequency ground resistance, alpha 1 To be impactedCoefficient of R 1 Is a surge ground resistance.
6. The method for evaluating the lightning impulse current-dissipating performance of the grounding device according to claim 5, wherein the impulse grounding resistance and the subsequent impulse grounding resistance are respectively compared with a safety threshold, and the specific comparison and the corresponding prediction result expression are as follows:
R s is a safe threshold value of the grounding resistance.
7. A grounding device lightning impulse current dissipation performance evaluation system is characterized by comprising a parameter acquisition module, a first calculation module, a second calculation module and a comparison and judgment module;
the parameter acquisition module is used for acquiring environmental parameters and impulse grounding resistance of the grounding device;
the first calculation module is used for calculating and obtaining a subsequent impact coefficient based on the environment parameters and in combination with the time interval of lightning impact;
the second calculation module is used for calculating and obtaining a subsequent impact resistance based on the subsequent impact coefficient and the impact grounding resistance;
and the comparison and judgment module is used for comparing the impulse grounding resistance and the subsequent impulse grounding resistance with a grounding resistance safety threshold respectively and evaluating the safety performance of the grounding device based on the comparison result of the impulse grounding resistance and the subsequent impulse grounding resistance.
8. The system for evaluating lightning impulse dissipation performance of a grounding device according to claim 7, wherein in said parameter obtaining module, said impulse grounding resistance is obtained by: the impact grounding resistance is obtained by obtaining the impact coefficient of the grounding device and the power frequency grounding resistance and carrying out product operation on the impact coefficient and the power frequency grounding resistance.
9. The system of claim 7, wherein the environmental parameters include ground electrode structure, soil resistivity, soil type moisture content.
10. A computer storage medium on which a computer program is stored, which computer program, when being executed by a processor, carries out the evaluation method according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211465140.7A CN115728608A (en) | 2022-11-22 | 2022-11-22 | Grounding device lightning impulse current dissipation performance evaluation method, system and medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211465140.7A CN115728608A (en) | 2022-11-22 | 2022-11-22 | Grounding device lightning impulse current dissipation performance evaluation method, system and medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115728608A true CN115728608A (en) | 2023-03-03 |
Family
ID=85297232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211465140.7A Pending CN115728608A (en) | 2022-11-22 | 2022-11-22 | Grounding device lightning impulse current dissipation performance evaluation method, system and medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115728608A (en) |
-
2022
- 2022-11-22 CN CN202211465140.7A patent/CN115728608A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9360352B2 (en) | Method for determining lightning hazard distribution of power network | |
| Shariatinasab et al. | Probabilistic evaluation of failure risk of transmission line surge arresters caused by lightning flash | |
| CN110208647B (en) | Power distribution network single-phase earth fault section positioning method based on random matrix | |
| CN112924817A (en) | Power distribution network fault accurate positioning method based on deep neural network | |
| CN108399147A (en) | A kind of transformer excitation flow recognition method based on MEEMD algorithms | |
| CN115078938B (en) | Method and device for identifying insulating property of lightning arrester | |
| Zalhaf et al. | Assessment of wind turbine transient overvoltages when struck by lightning: experimental and analytical study | |
| CN116167205A (en) | High-voltage transmission line hidden defect detection method and early warning system | |
| CN115728608A (en) | Grounding device lightning impulse current dissipation performance evaluation method, system and medium | |
| Shariatinasab et al. | Development of an adaptive neural‐fuzzy inference system based meta‐model for estimating lightning related failures in polluted environments | |
| Naxakis et al. | Performance of an installed lightning protection system in a photovoltaic park | |
| Li et al. | Lightning transient characteristics of cable power collection system in wind power plants | |
| CN117291418A (en) | Line lightning hazard risk assessment method and device based on distributed monitoring data | |
| Yuan et al. | Research on fusion algorithm of lightning strike trip warning for mountain transmission lines | |
| CN115982914A (en) | Grounding grid corrosion assessment method and system based on elastic grid theory | |
| CN110082652B (en) | Selection method and device for arcing horn and insulator string in overhead transmission line | |
| CN108596427B (en) | Method for drawing lightning risk grade map of power transmission line | |
| Kniaziev | Determination of the probability of a lightning strike in the elements of the object taking into account the statistical distribution of the current value. | |
| CN115060974A (en) | Method for selecting grounding resistance on-line monitoring position of direct current grounding electrode and related device | |
| Zhang et al. | Evaluation of Lightning Backflashover Rate of a Fully Composite Pylon using Monte Carlo Method on Environmental Factors | |
| CN108170645B (en) | Alternating-current gapless metal oxide lightning arrester state judgment method based on fuzzy matrix | |
| Wang et al. | Risk analysis method based on FMEA for transmission line in lightning hazards | |
| Rezinkina et al. | Computation of the probability of lightning damage to ground objects | |
| Ahmed et al. | Lightning surge response of wind turbine grounding at low resistivity soil | |
| WO2024011763A1 (en) | Method for evaluating lightning protection performance of shared tower |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |