A simulation system for low-current grounding faults in substations

Abstract

The application discloses a substation small current grounding fault simulation system, and relates to the technical field of fault simulation. The application solves the problem that the influence of environmental parameters on the accuracy of simulation is not considered. The application corrects the parameters needed in the simulation process associated with the grounding fault area according to the monitored environmental parameters, and corrects the associated parameters in real time based on the real-time collected related parameters, preliminarily guarantees the accuracy of the associated simulation process in the subsequent simulation process, and improves the accuracy in the fault simulation process. The simulation curve generated in the actual simulation process is compared with the actual monitored related curve, the similarity in the comparison and verification process is confirmed to confirm whether the simulation process meets the standard, if not, the correction factor is continuously adjusted, the accuracy associated with the simulation process is gradually improved, and the related accuracy in the simulation process is improved, and the accuracy of the simulation process is further improved.

Description

Technical Field

[0001] This invention relates to the field of fault simulation technology, specifically to a substation low-current grounding fault simulation system. Background Technology

[0002] In the medium-voltage distribution network sector, low-current grounding systems are widely used in urban power grids and industrial distribution systems due to their significant advantages, such as high power supply reliability and lower equipment insulation requirements. However, these systems are highly susceptible to single-phase grounding faults, accounting for over 70% of all distribution network faults. Failure to locate and simulate faults promptly and accurately can lead to the expansion of the fault area, causing serious accidents such as phase-to-phase short circuits and equipment burnout, and even large-scale power outages, resulting in significant losses to social production and daily life. Therefore, constructing an accurate and efficient low-current grounding fault simulation system is crucial for improving the fault handling capabilities of distribution networks and ensuring the safe and stable operation of the power grid.

[0003] Currently, extensive research has been conducted both domestically and internationally on simulation and fault location technologies for low-current grounding faults, and related fault location devices are gradually being put into practical application. However, existing technologies still have many limitations under complex operating conditions: on the one hand, most devices have low sensitivity, especially in scenarios with weak fault current and indistinct fault characteristics, making it difficult to effectively capture fault signals, resulting in a fault location accuracy of less than 60%; on the other hand, existing simulation systems generally ignore the dynamic influence of on-site environmental factors, failing to fully consider the interference of changes in parameters such as air humidity, air pressure, and temperature on the characteristics of the fault arc, resulting in a significant deviation between the simulation results and the actual fault state.

[0004] Further analysis reveals that environmental parameters significantly impact the arc resistance characteristics of low-current grounding faults. When air humidity increases in the grounding fault area, the ionization level of the arc channel changes, altering the dynamic evolution of breakdown resistance and arc resistance. Air pressure deviations directly affect the arc voltage and extinction characteristics, thus interfering with the accuracy of voltage parameter monitoring. Temperature fluctuations cause a shift in the time constant of the fault circuit, affecting the accuracy of resistance change rate calculations. Traditional simulation methods often use fixed-parameter models without real-time correction of these environmentally relevant parameters, resulting in low overlap between simulated and actual arc resistance change curves, failing to provide a reliable basis for fault diagnosis.

[0005] From a technical perspective, existing fault simulations primarily rely on steady-state information or single transient characteristics for analysis. Methods based on steady-state information struggle to adapt to the dynamic changes in the initial stages of a fault, particularly performing poorly on intermittent arcing ground faults. While methods based on transient information can capture the abrupt changes in the initial stages of a fault, they are limited by signal extraction techniques and cannot achieve accurate simulation of the entire fault cycle. Furthermore, existing systems lack effective verification and correction mechanisms. When simulation results deviate, the accuracy cannot be optimized by dynamically adjusting correction factors, resulting in system adaptability and reliability that fail to meet the operational requirements of complex power grids.

[0006] In summary, current substation low-current grounding fault simulation technology still has significant shortcomings in terms of environmental adaptability, dynamic parameter correction, full-cycle simulation accuracy, and self-optimization capabilities. Developing a fault simulation system capable of real-time monitoring of environmental parameters, dynamic correction of associated parameters, accurate simulation across all fault stages, and automatic verification and correction functions has become a critical technical issue urgently needing to be addressed in the field of distribution network safety operation and maintenance. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a substation low-current grounding fault simulation system, which solves the problem of not considering the impact of environmental parameters on the accuracy of the simulation process.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a substation low-current grounding fault simulation system, comprising:

[0009] The environmental parameter monitoring terminal monitors the air humidity, air pressure, and temperature parameters associated with the grounding fault area.

[0010] The correlation parameter correction terminal corrects the correlation parameters of the ground fault area based on the environmental parameters monitored in the ground fault area. The specific method is as follows:

[0011] Based on the environmental parameters monitored in the ground fault area, the real-time monitored air humidity is calibrated to SD. i Where i represents different times, using: k = 1 + A1 × (SD) i -50%) Confirm the correction coefficient k, where A1 is the correction factor, and simultaneously calibrate the monitored breakdown resistance as Ro, and use: Rx=Ro×k to obtain the correction resistance Rx;

[0012] The air pressure monitored in real time among the environmental parameters is calibrated as QY. i Where i represents different times, the monitored arc voltage is simultaneously calibrated as U. i Ux i =U i ×(P0 / QYi Confirm the arc correction voltage Ux associated with the corresponding time. i Where P0 is standard atmospheric pressure;

[0013] The ambient temperature monitored in real time among the environmental parameters is calibrated as WD. i Where i represents different times, using XZ i =τ×(A2 / WD i Confirm the corrected time constant XZ i , where τ is the time constant and A2 is the correction factor;

[0014] The real-time corrected correlation parameters are then transmitted to the resistance change simulation terminal. These correlation parameters include: corrected resistance Rx and arc correction voltage Ux. i and the corrected time constant XZ i ;

[0015] The resistance change simulation terminal, based on the corrected associated parameters, performs real-time simulation of the arc resistance change curve associated with the ground fault area. According to the current change trend, the ground fault stage is divided into three groups, and the timelines associated with each stage are determined. Different simulation methods are executed at different timelines to complete the simulation process of the resistance change curve. Specifically:

[0016] The real-time current associated with the ground fault area is monitored in real time, and the trend of the current change between adjacent times is confirmed based on the current change characteristics at adjacent times. The trend is compared with the preset trend interval, which is the preset interval, namely the rising trend interval, the stable trend interval, and the falling trend interval. The current segment with the trend of the rising trend interval is recorded as the rising segment, the current segment with the trend of the stable trend interval is recorded as the stable segment, and the current segment with the trend of the falling trend interval is recorded as the falling segment. The continuous waveform of "rising segment-stable segment-falling segment" is extracted from the real-time monitored current change waveform and recorded as the undetermined waveform. The time period associated with the rising segment in the undetermined waveform is recorded as the rising time period. The stable time period and the falling time period are determined simultaneously.

[0017] Based on the determined rise time period, breakdown resistance Ro, and correction resistance Rx, the resistance change rate associated with the rise time period is determined as follows: Resistance change rate = (1 / Rx - 1 / R) / XZ i R is the arc resistance, which is directly extracted from the monitored parameters. The different resistance change rates associated with different moments during the rising time period are determined, and the resistance change curve associated with the rising time period is generated in real time based on the breakdown resistance Ro associated with the initial moment of the rising time period.

[0018] Then, the arc current I is extracted from the relevant parameters, and R=Ux is applied synchronously based on the determined steady-state time period. i / I, identify the different resistances associated with different times within the steady period, and generate the resistance change curve associated with the steady period.

[0019] When determining the resistance change curve associated with the falling time period, the same method as determining the resistance change curve for the rising time period is used to generate the resistance change curve associated with the falling time period. The resistance change curves associated with the three different time periods are then integrated to generate the simulated resistance change curve associated with the waveform to be determined.

[0020] The verification and comparison end is used to compare the generated simulated resistance change curve with the actual arc resistance change curve to identify the similarity between the simulation and the actual curve. Based on the identification results, it is determined whether a correction center needs to be executed. The specific method is as follows:

[0021] Determine the initial and final points associated with the waveform to be determined, record the time line associated with the waveform to be determined, confirm the arc resistance change data located on this time line, and generate the arc resistance change curve. Record this change curve as the standard curve.

[0022] The resistance simulation curve is compared with the standard curve to verify their overlap. The two sets of curves are placed in the same two-dimensional coordinate system. The overlapping bands between the two sets of curves are identified, and the percentage of the line length of the overlapping band on the resistance simulation curve is recorded. The percentage of the line length is calculated as: (overlapping band length ÷ resistance simulation curve length). If the percentage of the line length is ≥ 0.95, the fault simulation process is up to standard, and no correction center is required. If the percentage of the line length is < 0.95, the fault simulation process is not up to standard, and a correction center is executed directly.

[0023] The correction center adjusts the correction factors associated with the simulation scene, executes multiple sets of different adjustment methods, records the similarity in subsequent simulation processes, thereby locking in the optimal correction factor and executing the simulation process. Specifically, the method is as follows:

[0024] Adjust the correction factors A1 and A2 associated with the simulation process, execute four sets of adjustment methods, each set of adjustment methods is associated with a set of simulation processes, confirm the similarity associated with the four sets of simulation processes, select the maximum value from the confirmed similarity, and record the adjustment method associated with the maximum value as the execution method.

[0025] Based on the determined execution method, the correction factors associated with the subsequent simulation process are continuously adjusted until the adjusted similarity reaches the target. The associated correction factors are then recorded as the optimal correction factors and executed.

[0026] Preferably, the four adjustment methods include: simultaneous upward adjustment of A1 and A2, simultaneous downward adjustment of A1 and A2, upward adjustment of A1 and downward adjustment of A2, and downward adjustment of A1 and upward adjustment of A2.

[0027] This invention provides a substation low-current grounding fault simulation system. Compared with existing technologies, it has the following advantages:

[0028] This invention corrects the parameters needed in the simulation process associated with the ground fault area by monitoring environmental parameters, and corrects the associated parameters in real time based on the relevant parameters collected in real time, thus providing preliminary assurance for the accuracy of the associated parameters in the subsequent simulation process and improving the accuracy of the fault simulation process.

[0029] Subsequently, the simulated curves generated during the actual simulation process will be compared and verified with the relevant curves monitored in the actual situation. Based on the similarity confirmed during the comparison and verification process, it will be determined whether the simulation process meets the standard. If it does not meet the standard, the correction factor will be continuously adjusted to gradually improve the accuracy associated with the simulation process, thereby improving the accuracy of the simulation process and further enhancing the accuracy of the simulation process. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the principle framework of the present invention. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1 This application provides a substation low-current grounding fault simulation system, including an environmental parameter monitoring terminal, an associated parameter correction terminal, a resistance change simulation terminal, a verification and comparison terminal, and a correction center. The environmental parameter monitoring terminal, the associated parameter correction terminal, the resistance change simulation terminal, and the verification and comparison terminal are electrically connected sequentially from the output node to the input node, and the verification and comparison terminal, the correction center, and the associated parameter correction terminal are electrically connected sequentially from the output node to the input node.

[0033] Among them, the environmental parameter monitoring end monitors the air humidity, air pressure and temperature parameters associated with the ground fault area, and transmits the real-time monitored environmental parameters to the associated parameter correction end. Specifically, in the corresponding ground fault area, corresponding monitoring sensors are set up to monitor the air humidity, air pressure and temperature parameters in the ground fault area in real time. According to the corresponding parameter monitoring progress, the correction factor in the corresponding environment can be effectively changed to comprehensively confirm the difference of environmental parameters on the actual monitored arc resistance, thereby realizing a high-precision arc curve evaluation process.

[0034] The associated parameter correction end corrects the associated parameters of the ground fault area based on the environmental parameters monitored in the ground fault area, and transmits the corrected associated parameters to the resistance change simulation end. When the corresponding environmental parameters change, the resistance, voltage and corresponding time constant associated with the ground fault area will change. In order to make the subsequent simulation process more accurate, the associated parameters need to be corrected.

[0035] The specific method for correcting the associated parameters is as follows:

[0036] Based on the environmental parameters monitored in the ground fault area, the real-time monitored air humidity is calibrated to SD. i Where i represents different times, using: k = 1 + A1 × (SD) i -50%) Confirm the correction coefficient k, where A1 is the correction factor, with a value range of 0.01-0.03. Simultaneously, calibrate the monitored breakdown resistance as Ro (its breakdown resistance is the resistance associated with the initial breakdown moment during the grounding process. In the actual monitoring process, the corresponding resistance will drop sharply, which will cause the corresponding current to increase sharply. According to the specific monitoring process, it can be confirmed that there is a grounding fault in the current area. There is a set threshold. When the current change trend generated by the current at adjacent moments exceeds this set threshold, it means that there is a breakdown. At the moment of exceeding, the associated resistance is the breakdown resistance, and it is calibrated). And use: Rx=Ro×k to obtain the correction resistance Rx;

[0037] The air pressure monitored in real time among the environmental parameters is calibrated as QY. i Where i represents different times, the monitored arc voltage is simultaneously calibrated as U. i Ux i =U i ×(P0 / QY i Confirm the arc correction voltage Ux associated with the corresponding time. i Where P0 is standard atmospheric pressure, with a value of 101.3 kPa;

[0038] The ambient temperature monitored in real time among the environmental parameters is calibrated as WD.i Where i represents different times, using XZ i =τ×(A2 / WD i Confirm the corrected time constant XZ i , where τ is the time constant, and A2 is the correction factor, with a value range of 291-295;

[0039] The real-time corrected correlation parameters are then transmitted to the resistance change simulation terminal. These correlation parameters include: corrected resistance Rx and arc correction voltage Ux. i and the corrected time constant XZ i ;

[0040] Specifically, the relevant parameters required in the corresponding simulation model are corrected. According to the corresponding correction process, the associated parameters are adjusted in sequence, and the change state of arc resistance is simulated based on the adjusted associated parameters. Based on the comparison and verification process of multiple simulations, the correction factor in the simulation process is corrected in real time, thereby improving the accuracy of the simulation process and enhancing the overall simulation effect in the correction simulation process.

[0041] Among them, the resistance change simulation end simulates the arc resistance change curve associated with the ground fault area in real time based on the corrected associated parameters. According to the current change trend, the ground fault stage is divided into three stages, and the time line associated with different stages is determined. Different simulation methods are executed on different time lines to complete the simulation process of the resistance change curve.

[0042] The specific method for real-time simulation of the arc resistance variation curve is as follows:

[0043] The real-time current associated with the ground fault area is monitored in real time, and the trend of the current change between adjacent times is confirmed based on the current change characteristics of adjacent times. The trend of change is equal to the current at the next time - the current at the previous time. The trend of change is compared with the preset trend interval, which is the preset interval, which is determined in advance by the operator. These intervals are called rising trend interval, stable trend interval, and falling trend interval. The current segment with the trend of change belonging to the rising trend interval is recorded as the rising segment, the current segment with the trend of change belonging to the stable trend interval is recorded as the stable segment, and the current segment with the trend of change belonging to the falling trend interval is recorded as the falling segment. The continuous waveform of "rising segment - stable segment - falling segment" is extracted from the real-time monitored current change waveform and recorded as the undetermined waveform. The time period associated with the rising segment in the undetermined waveform is recorded as the rising time period. The stable time period and the falling time period are determined simultaneously.

[0044] Based on the determined rise time period, breakdown resistance Ro, and correction resistance Rx, the resistance change rate associated with the rise time period is determined as follows: Resistance change rate = (1 / Rx - 1 / R) / XZ i R is the arc resistance, which is directly extracted from the monitored parameters. The different resistance change rates associated with different moments during the rising time period are determined, and the resistance change curve associated with the rising time period is generated in real time based on the breakdown resistance Ro associated with the initial moment of the rising time period.

[0045] Then, the arc current I is extracted from the relevant parameters, and R=Ux is applied synchronously based on the determined steady-state time period. i / I, identify the different resistances associated with different times within the steady period, and generate the resistance change curve associated with the steady period.

[0046] When determining the resistance change curve associated with the falling time period, the same method as determining the resistance change curve for the rising time period is used to generate the resistance change curve associated with the falling time period. The resistance change curves associated with the three different time periods are then integrated to generate the simulated resistance change curve associated with the waveform to be determined.

[0047] Specifically, different simulation scenarios exist at different time periods. The simulated change curve is compared and verified with the arc resistance change curve in the actual operation process. Based on the actual comparison and verification process, the similarity between the two sets of curves is confirmed in real time. When the simulated similarity meets the standard, the correction factor in the standard state is recorded, and this correction factor is executed in the subsequent simulation operation to ensure that the curves coincide in the standard state.

[0048] Among them, the verification and comparison end compares the generated simulated resistance change curve with the actual arc resistance change curve to identify the similarity of the simulation, and determines whether a correction center needs to be executed based on the identification result.

[0049] The specific method for identification based on simulated similarity is as follows:

[0050] Determine the initial and final points associated with the waveform to be determined, record the time line associated with the waveform to be determined, confirm the arc resistance change data located on this time line, and generate the arc resistance change curve. Record this change curve as the standard curve.

[0051] The resistance simulation curve is compared with the standard curve for overlap verification. The two sets of curves are placed in the same two-dimensional coordinate system to identify the overlapping bands between the two sets of curves. The percentage of the line length of the overlapping band on the resistance simulation curve is recorded. The percentage of the line length is calculated as: (overlapping band length ÷ resistance simulation curve length). If the percentage of the line length is ≥0.95, the fault simulation process is considered satisfactory and no correction center is required. If the percentage of the line length is <0.95, the fault simulation process is considered unsatisfactory and a correction center is directly executed to complete the adjustment process of the correction factor, thereby ensuring the accuracy of the simulation process.

[0052] Specifically, when performing overlap verification, if the proportion of overlapping segments exceeds the corresponding set threshold, it means that the simulation process has met the standard. If it does not exceed the corresponding set threshold, the set correction factor needs to be adjusted accordingly to ensure the accuracy of the simulation process.

[0053] The correction center adjusts the correction factors associated with the simulation scene, executes multiple different adjustment methods, records the similarity in subsequent simulation processes, thereby locking in the optimal correction factor and executing the simulation process. The specific method for locking in the optimal correction factor is as follows:

[0054] Adjust the correction factors A1 and A2 associated with the simulation process, and execute four sets of adjustment methods. Each set of adjustment methods is associated with one set of simulation processes. The four sets of adjustment methods are: simultaneous upward adjustment of A1 and A2, simultaneous downward adjustment of A1 and A2, upward adjustment of A1 and downward adjustment of A2, and downward adjustment of A1 and upward adjustment of A2. Confirm the similarity associated with the four sets of simulation processes, and select the maximum value from the confirmed similarity (line length ratio). Record the adjustment method associated with the maximum value as the execution method.

[0055] Based on the determined execution method, the correction factors associated with the subsequent simulation process are continuously adjusted until the adjusted similarity reaches the target. The associated correction factors are then recorded as the optimal correction factors and the simulation is executed.

[0056] Specifically, when adjusting the correction factor, there are multiple different adjustment methods. Each different adjustment method will affect the similarity. When the similarity is at its maximum value, it means that the corresponding adjustment method is the best adjustment method. Then, the corresponding adjustment method is executed to adjust and change the correction factor to determine the optimal state, thereby locking in the best correction factor to achieve the best execution and application effect.

[0057] Some of the data in the above formulas are numerical calculations with dimensions removed, and the contents not described in detail in this specification are all prior art known to those skilled in the art.

[0058] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A substation small current ground fault simulation system, characterized in that, The method comprises the following steps: An environmental parameter monitoring terminal monitors air humidity, air pressure, and temperature parameters associated with the grounding fault area; An associated parameter correction terminal corrects the associated parameters of the grounding fault area based on the monitored environmental parameters of the grounding fault area, and the correction is performed in the following manner: The air humidity, which is monitored in real time among the environmental parameters, is calibrated as SD according to the environmental parameters monitored in the ground fault area i where i represents different time points, and k = 1 + A1 x (SD i - 50%) is adopted to confirm the correction coefficient k, where A1 is a correction factor, the monitored breakdown resistance is calibrated as Ro at the same time, and Rx = Ro x k is adopted to obtain the corrected resistance Rx; The real-time monitored air pressure in the environmental parameter is calibrated as QY i , wherein i represents different time points, and the monitored arc voltage is calibrated as U synchronously i , and the following is adopted: Ux i =U i × (P0 / QY i ) to confirm the arc correction voltage Ux associated with the corresponding time point i , wherein P0 is a standard atmospheric pressure; The real-time monitored ambient temperature in the environmental parameter is calibrated as WD i where i represents different time points, XZ i = τ × (A2 / WD i ) to confirm the corrected time constant XZ i where τ is the time constant, and A2 is the correction factor. And the real-time corrected correlation parameters are transmitted to the resistance change simulation end, and the correlation parameters include: corrected resistance Rx, arc corrected voltage Ux i And the corrected time constant XZ i； An electric arc resistance change simulation terminal simulates the electric arc resistance change curve associated with the grounding fault area in real time based on the corrected associated parameters, divides the grounding fault stage into three groups based on the change trend of the current, determines the time line associated with different stages, and performs different simulation methods at different time lines to complete the simulation process of the electric arc resistance change curve, and the simulation is performed in the following manner: Real-time monitoring of the real-time current associated with the grounding fault area, and determining the change trend between the currents at adjacent time points based on the current change characteristics at adjacent time points, comparing the change trend with the preset trend interval, and determining the trend interval, which is a preset interval, including an upward trend interval, a stable trend interval, and a downward trend interval, recording the current segment as an upward segment if the change trend belongs to the upward trend interval, recording the current segment as a stable segment if the change trend belongs to the stable trend interval, and recording the current segment as a downward segment if the change trend belongs to the downward trend interval, extracting the continuous waveform of the "upward segment-stable segment-downward segment" from the real-time monitored current change waveform, recording it as a to-be-determined waveform, determining the time period associated with the upward segment in the to-be-determined waveform as an upward time period, and simultaneously determining the stable time period and the downward time period; According to the determined rising time period and the breakdown resistance Ro and the correction resistance Rx, the resistance change rate associated with the rising time period is determined, and the resistance change rate = (1 / Rx-1 / R) / XZ i Wherein R is the arc resistance, which is directly extracted from the monitored relevant parameters, the different resistance change rates associated with different time instants in the rising time period are determined, and the resistance change curve associated with the rising time period is generated in real time according to the breakdown resistance Ro associated with the initial time instant of the rising time period. Then the arc current I is extracted from the relevant parameters, and in accordance with the determined stable time period, R=Ux i / I is adopted to confirm different resistances associated with different time periods in the stable time period, and a resistance change curve associated with the stable time period is generated. When determining the electric arc resistance change curve associated with the downward time period, the same determination method as that of the upward time period is used to determine the electric arc resistance change curve associated with the downward time period, and the electric arc resistance change curves associated with the three different time periods are integrated to generate the electric arc resistance change curve associated with the to-be-determined waveform. A check and verification comparison terminal compares and verifies the generated electric arc resistance change curve with the actual electric arc resistance change curve, identifies the similarity of the simulation, and determines whether the correction center needs to be executed based on the identification result. The correction center adjusts the correction factor associated with the simulation scene, executes multiple different adjustment methods, records the similarity in the subsequent simulation process, locks the best correction factor, and executes the simulation process.

2. The substation small current ground fault simulation system of claim 1, wherein, The check and verification comparison terminal identifies the simulation similarity in the following manner: Determine the initial point and the end point associated with the to-be-determined waveform, record the time line associated with the to-be-determined waveform, confirm the electric arc resistance change data located in the time line, and generate the electric arc resistance change curve, which is recorded as a standard curve; Align and verify the electric arc resistance change curve with the standard curve, place the two curves in the same two-dimensional coordinate system, confirm the overlapping wave segment between the two curves, and record the line length ratio of the overlapping wave segment in the electric arc resistance change curve, which is line length ratio = total line length of overlapping wave segment ÷ total line length of electric arc resistance change curve, if the line length ratio is greater than or equal to 0.95, it means that the fault simulation process meets the standard and the correction center does not need to be executed.

3. A substation small current ground fault simulation system according to claim 2, characterized in that, If the line length proportion is less than 0.95, it means that the fault simulation process is not up to standard, and the correction center is directly executed.

4. The substation small current ground fault simulation system of claim 3, wherein, The specific way of locking the optimal correction factor in the correction center is: The correction factors A1 and A2 associated with the simulation process are adjusted, four groups of adjustment modes are executed, each group of adjustment mode is associated with a group of simulation process, the similarity associated with the four groups of simulation process is confirmed, and the maximum value is selected from the confirmed similarity, and the adjustment mode associated with the maximum value is recorded as the execution mode; According to the determined execution mode, the correction factors associated with the subsequent simulation process are continuously adjusted, and the adjustment is stopped when the adjusted similarity is up to standard, the associated correction factor is recorded, which is recorded as the optimal correction factor and executed.

5. A substation small current ground fault simulation system according to claim 4, wherein, The four groups of adjustment modes respectively include: A1 and A2 are synchronously adjusted upward, A1 and A2 are synchronously adjusted downward, A1 is adjusted upward and A2 is adjusted downward, and A1 is adjusted downward and A2 is adjusted upward.

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