CN109948193B - Railway traction substation lightning stroke safety evaluation method of interconnected comprehensive grounding system - Google Patents
Railway traction substation lightning stroke safety evaluation method of interconnected comprehensive grounding system Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a system for evaluating the lightning stroke safety of a railway traction substation of an interconnected comprehensive grounding system, wherein the method comprises the following steps: lightning impulse simulation calculation is carried out on the simulation model, and a simulation numerical calculation result is obtained; the simulation model is established based on the structural parameters of the grounding device of the railway traction substation and the structural parameters of the comprehensive grounding system, and the railway traction substation is interconnected with the comprehensive grounding system; and comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result. The safety evaluation result of the embodiment of the invention can reflect the safety performance of the traction substation grounding device and the railway comprehensive grounding system when being interconnected, and the safety of the interconnected traction substation is evaluated.
Description
Technical Field
The embodiment of the invention relates to the field of high-speed railways, in particular to a method for evaluating lightning stroke safety of a railway traction substation of an interconnected comprehensive grounding system.
Background
The grounding scale of the grounding device of the traction substation along the high-speed railway is smaller, and the grounding impedance can hardly reach the standard when the grounding device exists alone. The grounding impedance of the railway comprehensive grounding system is less than 1 omega, and the important function of the grounding system is to provide a common ground terminal for railway facilities along the line, particularly traction substations. When the railway traction substation is interconnected with the comprehensive grounding system, the grounding impedance of the traction substation is reduced to be lower than 1 omega, and the safety parameters of the ground grid such as contact voltage, step voltage and ground potential rise can meet the standard requirements in a very wide soil resistivity range. However, when the traction substation is struck by lightning after the traction substation grounding device and the comprehensive grounding system are interconnected, how to evaluate the safety of the traction substation becomes a problem to be solved urgently.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a method and a system for evaluating lightning stroke safety of a railway traction substation of an interconnected integrated grounding system, which overcome the above problems or at least partially solve the above problems.
According to a first aspect of the embodiments of the present invention, there is provided a method for evaluating lightning stroke safety of a railway traction substation of an interconnected integrated grounding system, the method including: lightning impulse simulation calculation is carried out on the simulation model to obtain a simulation numerical calculation result; the simulation model is established based on the structural parameters of the grounding device of the railway traction substation and the structural parameters of the comprehensive grounding system, and the railway traction substation is interconnected with the comprehensive grounding system; and comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result.
According to a second aspect of the embodiments of the present invention, there is provided a railway traction substation lightning safety evaluation system of an interconnected integrated grounding system, the system including: the simulation module is used for carrying out lightning impulse simulation calculation on the simulation model to obtain a simulation numerical calculation result; the simulation model is established based on structural parameters of a grounding device of the railway traction substation and structural parameters of a comprehensive grounding system, and the railway traction substation is interconnected with the comprehensive grounding system; and the evaluation module is used for comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value and obtaining the safety evaluation result of the railway traction substation according to the comparison result.
According to a third aspect of the embodiments of the present invention, there is provided an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method for evaluating the lightning strike safety of the railway traction substation of the interconnected integrated grounding system according to any one of the various possible implementation manners of the first aspect.
According to a fourth aspect of the embodiments of the present invention, there is provided a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for evaluating lightning strike safety of a railway traction substation of an interconnected integrated grounding system as provided in any one of the various possible implementations of the first aspect.
According to the method and the system for evaluating the lightning stroke safety of the railway traction substation of the interconnected comprehensive grounding system, provided by the embodiment of the invention, the lightning impulse simulation calculation is carried out on the simulation model to obtain a simulation numerical value calculation result; and comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result, wherein the safety evaluation result can reflect the safety performance of the interconnection of the grounding device of the traction substation and the railway comprehensive grounding system, and the safety of the interconnected traction substations is evaluated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from these without inventive effort.
FIG. 1 is a schematic flow chart of a method for evaluating lightning stroke safety of a railway traction substation of an interconnected integrated grounding system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for evaluating lightning strike safety of a railway traction substation of the interconnected integrated grounding system according to another embodiment of the invention;
FIG. 3 is a schematic structural diagram of a lightning strike safety evaluation system of a railway traction substation of the interconnected integrated grounding system according to an embodiment of the present invention;
fig. 4 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to evaluate the accumulated safety of the railway traction substation of the interconnected comprehensive grounding system, the embodiment of the invention provides a method for evaluating the lightning stroke safety of the railway traction substation of the interconnected comprehensive grounding system, which is shown in a figure 1 and comprises the following steps:
Before step 10, a simulation model may be established, where the simulation model is a simulation calculation model of the traction substation interconnection comprehensive grounding system. The simulation model is obtained based on models of a traction substation grounding model and a railway comprehensive grounding system model, and the traction substation and the comprehensive grounding system are interconnected; the construction process is specifically established by the structural parameters of the grounding device of the high-speed railway traction power transformer and the structural parameters of the comprehensive grounding system of the high-speed railway. In step 10, lightning impulse simulation calculation is performed on the simulation model by setting a certain simulation condition or simulation parameter for the simulation model, so as to obtain a simulation numerical calculation result output by the simulation model.
And 20, comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with a corresponding set value, and obtaining a safety evaluation result of the railway traction substation according to the comparison result.
Specifically, after the simulation numerical calculation result is obtained in step 10, a simulation value of the evaluation index may be obtained from the simulation numerical calculation result. The evaluation indexes are parameters for evaluating the safety of the railway traction substation, one or more evaluation indexes can be provided, and each evaluation index can reflect the safety performance of the traction substation after being interconnected to the comprehensive grounding system from a certain level. The evaluation index includes, but is not limited to, one or more of the following parameters: the system comprises an impulse grounding resistor R, a current amplitude attenuation coefficient alpha flowing from a traction substation to a comprehensive grounding system, a maximum potential rise attenuation coefficient beta of a conductor of the comprehensive grounding system and the influence range length L of the potential rise section of the conductor of the comprehensive grounding system. Before step 20, a set value of the evaluation index may be set in advance, and the set value reflects a numerical range in which the value of the evaluation index should be in a safe state of the traction substation. Therefore, in step 20, the simulated value and the set value can be compared, and the safety evaluation result of the railway traction substation can be obtained based on the comparison result. For example, if the comparison result is that the simulation value is greater than a set value, and the set value is the maximum value corresponding to the evaluation index when the railway traction substation is in the safe state, the safety evaluation result of the railway traction substation is unqualified.
In addition, if the safety evaluation result in step 20 is not qualified, after step 20, relevant safety measures can be taken for the integrated grounding system and/or the railway traction substation, and after the safety measures are completed, the above steps 10 and 20 are executed again until the safety evaluation result is qualified.
According to the method for evaluating the lightning stroke safety of the railway traction substation of the interconnected comprehensive grounding system, provided by the embodiment of the invention, a simulation numerical value calculation result is obtained by performing lightning impulse simulation calculation on a simulation model; and comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result, wherein the safety evaluation result can reflect the safety performance of the interconnection of the grounding device of the traction substation and the railway comprehensive grounding system, and the safety of the interconnected traction substations is evaluated.
Based on the content of the foregoing embodiment, as an alternative embodiment, the evaluation index includes: the impact grounding resistance R, the attenuation coefficient alpha of the current amplitude flowing to the comprehensive grounding system from the traction substation, the attenuation coefficient beta of the maximum potential rise of the conductor of the comprehensive grounding system and the length L of the influence range of the conductor potential rise section of the comprehensive grounding system. The evaluation index can reflect the safety of the traction substation interconnected to the railway comprehensive grounding system from various aspects.
Accordingly, a method for comparing a simulation value of an evaluation index obtained from a simulation numerical calculation result with a corresponding set value and obtaining a safety evaluation result of a railway traction substation according to the comparison result is provided, which includes, but is not limited to, the following steps 201 and 202:
step 201, comparing the simulated value of each evaluation index with the corresponding set value respectively to obtain a comparison result corresponding to each evaluation index.
Specifically, since the evaluation indexes include one or more of the four evaluation indexes, it is necessary to set a corresponding set value for each evaluation index, and compare the simulated value of each evaluation index with a preset set value of the evaluation index, so as to obtain a comparison result corresponding to each evaluation index.
And step 202, if the comparison result of each evaluation index meets the corresponding safety condition, the safety evaluation result of the railway traction substation is qualified.
It should be noted that the safety evaluation result of the railway traction substation can be determined to be qualified only when each evaluation index meets the safety condition; in other words, if any one of the evaluation indexes does not satisfy the corresponding safety condition, the result of the safety evaluation of the railway traction substation is determined to be a failure.
According to the embodiment of the invention, various types of evaluation indexes are selected, the safety of the traction substation interconnected to the railway comprehensive grounding system can be comprehensively evaluated from all aspects, and the safety evaluation result of the railway traction substation is confirmed to be qualified when the comparison result of each evaluation index meets the corresponding safety condition, so that the accuracy of the safety evaluation result is ensured.
Based on the content of the above embodiment, as an optional embodiment, the evaluation index is an impulse grounding resistance, and the set value of the evaluation index is a maximum impulse grounding resistance; correspondingly, the safety condition corresponding to the evaluation index is that the simulated value of the impulse grounding resistance is not greater than the maximum grounding resistance. Specifically, if the impulse grounding resistance R is not greater than the set maximum impulse grounding resistance RmaxThen R satisfies the safety condition.
Based on the content of the foregoing embodiment, as an optional embodiment, the evaluation index is a current amplitude attenuation coefficient, the set value of the evaluation index is a maximum current amplitude attenuation coefficient, and the current amplitude attenuation coefficient is obtained by the following formula:
α＝(I1max-I2max)/I1max
wherein α is the current amplitude attenuation coefficient, I1maxFor injection into traction substations2maxThe current amplitude value of the traction substation grounding device flowing to the comprehensive grounding system is obtained;
Correspondingly, the safety condition corresponding to the evaluation index is that the simulation value alpha of the current amplitude attenuation coefficient is not more than the maximum current amplitude attenuation coefficient alphamax。
Wherein, the current amplitude attenuation coefficient is defined as follows: the attenuation coefficient alpha of the current amplitude flowing from the grounding device of the traction substation to the comprehensive grounding system is the lightning current amplitude I injected into the traction substation1maxSubtracting the current amplitude I of the comprehensive grounding system flowing to the grounding device of the traction substation2maxAfter divided by I1maxObtained, i.e. alpha ═ I (I)1max-I2max)/I1max。
Based on the content of the foregoing embodiment, as an alternative embodiment, the evaluation index is a maximum potential rise-fall coefficient, the setting value of the evaluation index is a maximum value of the maximum potential rise-fall coefficient, and the maximum potential rise-fall coefficient is obtained by the following formula:
β＝(U1max-U2max)/U1max
wherein beta is the maximum potential rise-fall coefficient, U1maxFor the potential rise value, U, of the lightning current injection point of the grounding device of the traction substation2maxThe maximum potential of the conductor of the comprehensive grounding system is increased;
correspondingly, the safety condition corresponding to the evaluation index is that the simulated value beta of the maximum potential rise-fall coefficient is not more than the maximum value beta of the maximum potential rise-fall coefficientmax。
Wherein, the maximum potential rise-fall coefficient is defined as follows: the maximum potential rise attenuation coefficient beta of the conductor of the comprehensive grounding system is the potential rise value U of the lightning current injection point of the grounding device of the traction substation 1maxMinus the maximum potential rise U of the conductor of the integrated earthing system2maxAfter divided by U1maxIs obtained, i.e. beta ═ U1max-U2max)/U1max。
Based on the content of the foregoing embodiment, as an optional embodiment, the evaluation index is a length of an influence range of a conductor potential rise section, a set value of the evaluation index is a length of an influence range of a maximum conductor potential rise section, and the length of the influence range of the conductor potential rise section is a length of a comprehensive ground wire between the maximum potential rise of the conductor of the comprehensive grounding system and a set minimum potential rise of the conductor of the comprehensive grounding system;
correspondingly, the safety condition corresponding to the evaluation index is that the simulation value L of the influence range length of the conductor potential rise section is not more than the influence range length L of the maximum conductor potential rise sectionmax。
Wherein, the length of the influence range of the conductor potential rise section is defined as follows: the influence length L of the potential rise section of the conductor of the comprehensive grounding system is that the maximum potential of the conductor of the comprehensive grounding system rises to U2maxAnd the set minimum potential of the comprehensive grounding system conductor rises to U2minThe overall ground length therebetween.
Based on the content of the foregoing embodiment, as an alternative embodiment, before comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value in step 20, the method for evaluating security further includes:
Extracting target data from the simulation numerical calculation result, wherein the target data comprises potential rise data of a lightning current injection point, current data flowing to the comprehensive grounding system from a traction substation grounding device and conductor potential rise data of the comprehensive grounding system;
and carrying out data analysis processing on the target data to obtain simulation values of each evaluation index.
In order to describe the method for evaluating the lightning safety of the railway traction substation of the interconnected comprehensive grounding system provided by the embodiment of the invention, the following description is given by taking the example in combination with fig. 2, and the evaluation method specifically includes the following steps:
step 1: establishing a simulation calculation model; establishing a simulation calculation model of the interconnected comprehensive grounding system of the traction substation according to the structural parameters of the grounding device of the traction substation and the structural parameters of the comprehensive grounding system of the high-speed railway;
step 2: calculating a simulation numerical value; the simulation model of the interconnected comprehensive grounding system of the traction substation is subjected to lightning current impact simulation calculation to obtain a simulation numerical calculation result;
and step 3: extracting simulation calculation data; extracting potential rise data of a lightning current injection point, current data flowing from a traction substation grounding device to a comprehensive grounding system and conductor potential rise data of the comprehensive grounding system from a simulation numerical calculation result;
And 4, step 4: processing data; analyzing and processing the extracted simulation calculation data to obtain an impulse grounding resistor R, a current amplitude attenuation coefficient alpha flowing from a traction substation to a comprehensive grounding system, a maximum potential rise attenuation coefficient beta of a conductor of the comprehensive grounding system and a potential rise section influence range L of the conductor of the comprehensive grounding system;
and 5: evaluating safety; the impact grounding resistance R, the current amplitude attenuation coefficient alpha, the maximum potential rise attenuation coefficient beta and the potential rise section influence range L are compared with preset values to obtain a safety evaluation result;
and 6: if the safety evaluation is unqualified, other relevant measures are required, and then the steps are restarted from the step 1 until the safety evaluation is qualified.
Based on the content of the above embodiment, the embodiment of the invention provides a railway traction substation lightning safety evaluation system of an interconnected integrated grounding system, and the railway traction substation lightning safety evaluation system of the interconnected integrated grounding system is used for executing the railway traction substation lightning safety evaluation method of the interconnected integrated grounding system in the above method embodiment. Referring to fig. 3, the system includes: a simulation module 301 and an evaluation module 302; the simulation module 301 is configured to perform lightning impulse simulation calculation on the simulation model to obtain a simulation numerical calculation result; the simulation model is established based on the structural parameters of the grounding device of the railway traction substation and the structural parameters of the comprehensive grounding system, and the railway traction substation is interconnected with the comprehensive grounding system; and the evaluation module 302 is configured to compare a simulation value of an evaluation index obtained from the simulation numerical calculation result with a corresponding set value, and obtain a safety evaluation result of the railway traction substation according to the comparison result.
Specifically, the simulation module 301 may first establish a simulation model, which is a simulation calculation model of the traction substation interconnection integrated grounding system. The simulation module 301 sets a certain simulation condition or simulation parameter for the simulation model, and performs lightning impulse simulation calculation on the simulation model to obtain a simulation numerical calculation result output by the simulation model. The evaluation module 302 may obtain a simulation value of the evaluation index from the simulation numerical calculation result. The evaluation indexes are parameters for evaluating the safety of the railway traction substation, one or more evaluation indexes can be provided, and each evaluation index can reflect the safety performance of the traction substation after being interconnected to the comprehensive grounding system from a certain level. The evaluation module 302 may also preset a set value of an evaluation index that reflects a numerical range to which the value of the evaluation index should belong when the traction substation is in a safe state.
According to the railway traction substation lightning safety evaluation system of the interconnected comprehensive grounding system, provided by the embodiment of the invention, a simulation numerical value calculation result is obtained by performing lightning impulse simulation calculation on a simulation model; and comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result, wherein the safety evaluation result can reflect the safety performance of the interconnection of the grounding device of the traction substation and the railway comprehensive grounding system, and the safety of the interconnected traction substations is evaluated.
An embodiment of the present invention provides an electronic device, as shown in fig. 4, the electronic device includes: a processor (processor)401, a communication Interface (Communications Interface)402, a memory (memory)403 and a communication bus 404, wherein the processor 401, the communication Interface 402 and the memory 403 communicate with each other through the communication bus 404. The processor 401 may call a computer program on the memory 403 and operable on the processor 401 to execute the method for evaluating the safety of the lightning strike in the railway traction substation of the interconnected integrated grounding system according to the embodiments described above, for example, the method includes: lightning impulse simulation calculation is carried out on the simulation model, and a simulation numerical calculation result is obtained; the simulation model is established based on structural parameters of a grounding device of the railway traction substation and structural parameters of a comprehensive grounding system, and the railway traction substation is interconnected with the comprehensive grounding system; and comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result.
In addition, the logic instructions in the memory 403 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Embodiments of the present invention further provide a non-transitory computer readable storage medium, on which a computer program is stored, where the computer program is implemented by a processor to execute the method for evaluating lightning strike safety of a railway traction substation of an interconnection integrated grounding system provided in the foregoing embodiments, for example, the method includes: lightning impulse simulation calculation is carried out on the simulation model, and a simulation numerical calculation result is obtained; the simulation model is established based on structural parameters of a grounding device of the railway traction substation and structural parameters of a comprehensive grounding system, and the railway traction substation is interconnected with the comprehensive grounding system; and comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result.
The embodiments of the electronic device and the like described above are merely illustrative, where units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on the understanding, the above technical solutions substantially or partly contributing to the prior art may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the various embodiments or some parts of the methods of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for evaluating the lightning stroke safety of a railway traction substation of an interconnected comprehensive grounding system is characterized by comprising the following steps:
lightning impulse simulation calculation is carried out on the simulation model, and a simulation numerical calculation result is obtained; the simulation model is established based on structural parameters of a grounding device of a railway traction substation and structural parameters of a comprehensive grounding system, and the railway traction substation is interconnected with the comprehensive grounding system;
comparing simulation values of evaluation indexes obtained from the simulation numerical value calculation results with corresponding set values, and obtaining safety evaluation results of the railway traction substation according to comparison results;
the evaluation index includes: at least one of an impulse grounding resistance, an attenuation coefficient of a current amplitude flowing from the traction substation to the comprehensive grounding system, a maximum potential rise attenuation coefficient of a conductor of the comprehensive grounding system, and a length of an influence range of a conductor potential rise section of the comprehensive grounding system;
correspondingly, the comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result, includes:
Respectively comparing the simulated value of each evaluation index with a corresponding set value to obtain a comparison result corresponding to each evaluation index;
if the comparison result of each evaluation index meets the corresponding safety condition, the safety evaluation result of the railway traction substation is qualified;
the evaluation index is the current amplitude attenuation coefficient, the set value of the evaluation index is the maximum current amplitude attenuation coefficient, and the current amplitude attenuation coefficient is obtained by the following formula:
α＝(I1max-I2max)/I1max
in the formula, alpha is a current amplitude attenuation coefficient, I1max is a lightning current amplitude injected into the traction substation, and I2max is a current amplitude flowing from the grounding device of the traction substation to the comprehensive grounding system;
correspondingly, the safety condition corresponding to the evaluation index is that the simulated value of the current amplitude attenuation coefficient is not greater than the maximum current amplitude attenuation coefficient.
2. The method according to claim 1, characterized in that the evaluation index is a surge ground resistance, and the set value of the evaluation index is a maximum surge ground resistance; correspondingly, the safety condition corresponding to the evaluation index is that the simulated value of the impulse grounding resistance is not greater than the maximum grounding resistance.
3. The method according to claim 1, wherein the evaluation index is the maximum potential rise and fall coefficient, and the set value of the evaluation index is a maximum value of the maximum potential rise and fall coefficient, and the maximum potential rise and fall coefficient is obtained by the following formula:
β＝(U1max-U2max)/U1max
wherein beta is the maximum potential rise-decay coefficient, U1maxPotential rise value, U, of lightning current injection point of grounding device of traction substation2maxThe maximum potential of the conductor of the comprehensive grounding system is increased;
correspondingly, the safety condition corresponding to the evaluation index is that the simulated value of the maximum potential rise-fall coefficient is not larger than the maximum value of the maximum potential rise-fall coefficient.
4. The method according to claim 1, wherein the evaluation index is the conductor potential rise section influence range length, the set value of the evaluation index is a maximum conductor potential rise section influence range length, and the conductor potential rise section influence range length is a comprehensive ground wire length between a comprehensive grounding system conductor maximum potential rise and a set comprehensive grounding system conductor minimum potential rise;
correspondingly, the safety condition corresponding to the evaluation index is that the simulated value of the length of the influence range of the conductor potential rise section is not greater than the length of the influence range of the maximum conductor potential rise section.
5. The method according to claim 1, wherein before comparing the simulated value of the evaluation index obtained from the simulated numerical calculation result with the corresponding set value, the method further comprises:
extracting target data from the simulation numerical calculation result, wherein the target data comprise potential rise data of a lightning current injection point, current data flowing to the comprehensive grounding system from the traction substation grounding device and conductor potential rise data of the comprehensive grounding system;
and performing data analysis processing on the target data to obtain a simulation value of each evaluation index.
6. The utility model provides a railway traction substation lightning stroke security evaluation system of interconnected integrated grounding system which characterized in that includes:
the simulation module is used for carrying out lightning impulse simulation calculation on the simulation model to obtain a simulation numerical calculation result; the simulation model is established based on structural parameters of a grounding device of a railway traction substation and structural parameters of a comprehensive grounding system, and the railway traction substation is interconnected with the comprehensive grounding system;
the evaluation module is used for comparing a simulation value of an evaluation index obtained from the simulation numerical value calculation result with a corresponding set value and obtaining a safety evaluation result of the railway traction substation according to the comparison result; the evaluation index includes: at least one of an impulse grounding resistance, a current amplitude attenuation coefficient flowing from the traction substation to the comprehensive grounding system, a conductor maximum potential rise attenuation coefficient of the comprehensive grounding system, and a conductor potential rise section influence range length of the comprehensive grounding system;
Correspondingly, the comparing the simulation value of the evaluation index obtained from the simulation numerical value calculation result with the corresponding set value, and obtaining the safety evaluation result of the railway traction substation according to the comparison result, includes:
respectively comparing the simulated value of each evaluation index with a corresponding set value to obtain a comparison result corresponding to each evaluation index;
if the comparison result of each evaluation index meets the corresponding safety condition, the safety evaluation result of the railway traction substation is qualified;
the evaluation index is the current amplitude attenuation coefficient, the set value of the evaluation index is the maximum current amplitude attenuation coefficient, and the current amplitude attenuation coefficient is obtained by the following formula:
α＝(I1max-I2max)/I1max
in the formula, alpha is a current amplitude attenuation coefficient, I1max is a lightning current amplitude injected into the traction substation, and I2max is a current amplitude flowing from the grounding device of the traction substation to the comprehensive grounding system;
correspondingly, the safety condition corresponding to the evaluation index is that the simulated value of the current amplitude attenuation coefficient is not greater than the maximum current amplitude attenuation coefficient.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the method for evaluating lightning strike safety of a railway traction substation of an interconnected integrated grounding system according to any of claims 1 to 5.
8. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the method for assessing the safety of a railway traction substation lightning strike of an interconnected integrated grounding system according to any of claims 1 to 5.
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