Quantitative analysis method for influence of transient current on residual electrical life of high-voltage circuit breaker

Abstract

The invention relates to the field of circuit breakers, in particular to a quantitative analysis method for the influence of transient current on the residual electrical life of a high-voltage circuit breaker, which comprises the following steps: calculating the influence index of the transient current on the residual electrical life of the high-voltage circuit breaker; constructing a related parameter time sequence; calculating an influence factor of the relevant parameters at the current moment on the relevant parameters at the next moment; predicting numerical values of relevant parameters at the next moment; calculating the influence index of the transient current at the next moment on the residual electrical life of the high-voltage circuit breaker; evaluating the decay speed of the residual electrical life, and dynamically adjusting the maintenance cycle. The method has the advantages that the frequency characteristic of the fault current and the waveform distortion characteristic caused by the harmonic wave are brought into the evaluation system of the residual electrical life, the limitation that only the current amplitude is considered in the traditional method is broken through, the actual physical process of the contact ablation by the transient current can be reflected more truly and more comprehensively by constructing the comprehensive quantitative model, and the evaluation accuracy of the residual electrical life is improved. And the scientificity of an evaluation model and the accuracy of a prediction result are fundamentally improved.

Description

Technical Field

[0001] This invention relates to the field of circuit breakers, and more particularly to a quantitative analysis method for the impact of transient current on the remaining electrical life of high-voltage circuit breakers. Background Technology

[0002] High-voltage circuit breakers are crucial protection and control devices in power systems, and their reliability and remaining electrical life directly affect the safe and stable operation of the power grid. The electrical life of a circuit breaker mainly depends on the degree of arc erosion suffered by its contacts when interrupting fault current.

[0003] Currently, the industry's assessment method for the remaining electrical life of high-voltage circuit breakers mainly relies on statistical analysis of their historical breaking counts, combined with estimations based on the rated fault breaking counts provided by the manufacturer. This process typically involves collecting fault current amplitude information (such as RMS or peak value) and calculating the loss of electrical life due to a single breaking operation. This method assumes that the loss of electrical life has a simple linear or predefined functional relationship with the breaking current amplitude.

[0004] However, there are obvious limitations: it only considers the amplitude characteristics of the fault current, while completely ignoring other key physical characteristics of the current during the transient process; specifically: 1. Ignore the frequency characteristics of the current: In actual interruption processes, fault current often contains high-frequency components, which significantly affect the shape and stability of the arc, thereby directly affecting the ablation rate of the contacts. Ignoring frequency characteristics will lead to inaccurate assessment of wear in a single interruption.

[0005] 2. Ignore the waveform distortion characteristics of the current: Nonlinear loads in the power grid can cause fault currents to contain a large number of harmonics, resulting in waveform distortion. The distorted current waveform can exacerbate the irregular burning of the arc, leading to increased local wear on the contacts. Existing methods cannot reflect this effect.

[0006] Because it fails to comprehensively consider the multi-dimensional characteristics of current amplitude, frequency, and waveform distortion, existing technologies have a large error in predicting the rate of decay of the remaining electrical life of high-voltage circuit breakers. This may lead to improper maintenance planning: either due to being too conservative, unnecessary downtime and economic losses may occur, or due to being too optimistic, maintenance may not be carried out in time, creating potential safety hazards. Summary of the Invention

[0007] The purpose of this invention is to provide a quantitative analysis method for the impact of transient current on the remaining electrical life of high-voltage circuit breakers. This method breaks through the limitation of traditional methods that rely solely on the amplitude of fault current and establishes a comprehensive assessment that can simultaneously quantify the impact of fault current amplitude, frequency, and waveform distortion characteristics on electrical life. This solves the key technical problem that the impact of transient current on the remaining electrical life of high-voltage circuit breakers cannot be effectively quantified.

[0008] To achieve the above objectives, the present invention provides the following technical solution: Quantitative analysis methods for the impact of transient current on the remaining electrical life of high-voltage circuit breakers include: S1. Calculate the impact index of transient current on the remaining electrical life of high-voltage circuit breakers. Based on the composition of the influence index, the set of relevant parameters required for the influence index is obtained; The influence index of transient current on the remaining electrical life of high-voltage circuit breakers The calculation formula is: ①; In formula ①: for A set time interval, where... For natural numbers, , For the first At that moment, and For natural numbers, ; for The per-unit value of the peak fault current of the high-voltage circuit breaker at any given time; for The duration of the fault current of the high-voltage circuit breaker at any given moment; This refers to the rated breaking time of the high-voltage circuit breaker. for The per-unit value of the fault current frequency of the high-voltage circuit breaker at any given time; This represents the effective value of the fundamental current of the high-voltage circuit breaker. High-voltage circuit breaker RMS value of subharmonic current; S2. Measure relevant parameters and construct time series of relevant parameters; S3. Calculate the influence factors of the relevant parameters at the current time on the relevant parameters at the next time. ; S4. Based on the time series of relevant parameters and influencing factors, predict the values ​​of relevant parameters at the next time step; S5. Calculate the impact index of the transient current at the next moment on the remaining electrical life of the high-voltage circuit breaker. ; S6. Assess the rate of decay of remaining battery life and dynamically adjust the maintenance cycle.

[0009] The relevant parameter time series is calculated using the following formula: ②; In formula ②: Select A fixed time The peak fault current of the high-voltage circuit breaker was obtained by measurement. Fault current duration High-voltage circuit breaker fault current frequency Effective value of fundamental current of high voltage circuit breaker High-voltage circuit breaker RMS value of subharmonic current .

[0010] Influence factor of current relevant parameters on next relevant parameters The calculation formula is: ③; In formula ③: For the first The influence factor of the transient current at one moment on the remaining electrical life of the high-voltage circuit breaker and the transient current at the next moment on the remaining electrical life of the high-voltage circuit breaker. for The per-unit value of the peak fault current of the high-voltage circuit breaker at any given time; for The duration of the fault current at any given moment; The rated breaking time of the circuit breaker; for The per-unit value of the fault current frequency of the high-voltage circuit breaker at any given time; This represents the effective value of the fundamental current of the high-voltage circuit breaker. High-voltage circuit breaker Effective value of the second harmonic current.

[0011] Based on the time series of relevant parameters and influencing factors, the values ​​of the relevant parameters at the next time step are predicted using the following formula: ④; In formula ④: for The per-unit value of the peak fault current of the high-voltage circuit breaker at any given time; for The predicted duration of the fault current at any given time; for The per-unit value of the fault current frequency of the high-voltage circuit breaker at any given time; for High-voltage circuit breaker Predicted value of the effective value of the subharmonic current.

[0012] The impact index of transient current at the next moment on the remaining electrical life of high-voltage circuit breakers The calculation formula is: ⑤.

[0013] Assess the rate of remaining battery life degradation and dynamically adjust maintenance cycles accordingly: if If the remaining electrical life decay rate of the high-voltage circuit breaker decreases at the next moment, the maintenance cycle of the high-voltage circuit breaker will be extended. if If the time is right, then the maintenance will be scheduled according to the normal rate of decay of the remaining electrical life of the high-voltage circuit breaker at the next moment. if If this occurs, it is determined that the remaining electrical life decay rate of the high-voltage circuit breaker has increased, thus shortening the maintenance cycle of the high-voltage circuit breaker. in, for Time to The average value of the transient current measured at time t is the index of the impact of the transient current on the remaining electrical life of the high-voltage circuit breaker.

[0014] Relevant parameters include the peak fault current of the high-voltage circuit breaker during a set time period, the rated carrying current and fault current duration of the high-voltage circuit breaker, the rated breaking time of the high-voltage circuit breaker, the fault current frequency of the high-voltage circuit breaker, the effective value of the fundamental current of the high-voltage circuit breaker, and the high-voltage circuit breaker... The subharmonic current is effective.

[0015] A quantitative analysis system for the impact of transient current on the remaining electrical life of high-voltage circuit breakers, comprising a data acquisition module, a data processing module, a control module, and an output module; The data acquisition module is used to collect the peak value of the fault current, the duration of the fault current, the frequency of the fault current, and the effective values ​​of the fundamental and harmonic currents of the high-voltage circuit breaker in real time. The data processing module is used to construct parameter time series and calculate impact factors; The prediction module is used to predict the values ​​of relevant parameters at the next moment based on the time series of relevant parameters and influencing factors, and to calculate the impact index of transient current at the next moment on the remaining electrical life of high-voltage circuit breakers. The output module is used to output the remaining electrical life assessment results and maintenance recommendations.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. For the first time, the frequency characteristics of fault current and waveform distortion characteristics caused by harmonics are incorporated into the assessment system of remaining electrical life, breaking through the limitation of traditional methods that only consider the current amplitude. By constructing a comprehensive quantitative model, it can more realistically and comprehensively reflect the actual physical process of contact erosion caused by transient current, fundamentally improving the scientific nature of the assessment model and the accuracy of the prediction results. 2. By introducing dynamic influencing factors and multi-parameter time series prediction models, the system can more accurately depict the decay trend of electrical lifetime. Compared with the traditional method based on simple counting and amplitude accumulation, this invention significantly reduces prediction errors, helps to accurately grasp the true health status of circuit breakers, and provides reliable protection for the safe and stable operation of the power system. 3. It can dynamically adjust the maintenance cycle based on the predicted impact index, promoting the transformation of the operation and maintenance mode from the traditional "periodic maintenance" to the advanced "condition maintenance" and "predictive maintenance". When the predicted index is low, the maintenance interval can be appropriately extended to reduce operation and maintenance costs; when the predicted index is high, it can provide timely warnings and shorten the maintenance cycle, effectively prevent operational risks, and achieve the best balance between safety and economy. 4. By constructing a real-time data acquisition and closed-loop update process, it is possible to continuously track changes in the operating status of circuit breakers and automatically adjust the prediction model. This adaptive dynamic evaluation mechanism enables the system to adapt to different operating conditions and power grid environments, ensuring that the evaluation results are always consistent with the actual situation, and has high engineering practical value and promotion value. 5. The output quantitative impact index can serve as a key input parameter for the power grid intelligent operation and maintenance system, providing reliable data support and decision-making basis for advanced applications such as circuit breaker life cycle management, precise allocation of spare parts and components, and risk prevention and control of the entire network operation, helping to build a more intelligent and efficient power equipment management system and promote the construction of smart grids. Attached Figure Description

[0017] Figure 1 It is a quantitative analysis process for the impact of transient current on the remaining electrical life of high-voltage circuit breakers. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0019] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0020] Example 1 This invention addresses the critical technical challenge of accurately calculating the impact of fault current amplitude, frequency, and waveform distortion on the remaining electrical life of high-voltage circuit breakers during feature extraction and remaining electrical life prediction. It proposes a quantitative analysis method for the influence of transient current on the remaining electrical life of high-voltage circuit breakers. Figure 1 Taking the LW10B-252 type high-voltage SF6 circuit breaker, which is widely used in a 220kV substation of a certain city's power grid, as an example, the analysis includes the following steps: Step S1: Calculate the influence index of transient current on the remaining electrical life of high-voltage circuit breakers. Based on the impact index The composition of the index is determined by the relevant parameters required to obtain the influence index. These parameters include the peak fault current of the high-voltage circuit breaker during a set time period, the rated carrying current and fault current duration of the high-voltage circuit breaker, the rated breaking time of the high-voltage circuit breaker, the fault current frequency of the high-voltage circuit breaker, the effective value of the fundamental current of the high-voltage circuit breaker, and the high-voltage circuit breaker... RMS value of subharmonic current; The influence index of transient current on the remaining electrical life of high-voltage circuit breakers The calculation formula is: ①; In formula ①: for A set time interval, where... For natural numbers, , For the first At that moment, and For natural numbers, ; for The per-unit value of the peak fault current of the high-voltage circuit breaker at any given time; The baseline value for the peak fault current is 3150A, the rated current of the LW10B-252 type high-voltage SF6 circuit breaker. If the actual peak fault current value is 24000A, then... =7.619.

[0021] for The duration of the fault current of the high-voltage circuit breaker at any given time, such as =0.05s.

[0022] The rated breaking time of the high-voltage circuit breaker is equal to 2.5 cycles, such as a frequency of 50Hz. =50ms.

[0023] for The per-unit value of the fault current frequency of the high-voltage circuit breaker at any given time; the reference value for the current frequency is the rated frequency of 50Hz. For example, if the fault current frequency of the high-voltage circuit breaker is 51Hz... =1.02.

[0024] The effective value of the fundamental current of the high-voltage circuit breaker; the peak fault current divided by For example, 16970.563A.

[0025] High-voltage circuit breaker The effective value of the second harmonic current, such as the effective value of the second harmonic current. =1697.056A, the effective value of the third harmonic current is =8485.281A.

[0026] Step S2: Measure the relevant parameters required for the influence index of transient current on the remaining electrical life of high-voltage circuit breakers, and establish a time series of the relevant parameters required for the influence index of transient current on the remaining electrical life of high-voltage circuit breakers based on the obtained measurement values. The relevant parameter time series is calculated using the following formula: ②; In formula ②: Select A fixed time The peak fault current of the high-voltage circuit breaker was obtained by measurement. Fault current duration High-voltage circuit breaker fault current frequency Effective value of fundamental current of high voltage circuit breaker High-voltage circuit breaker RMS value of subharmonic current .

[0027] If six fixed time intervals of one hour are selected, six sets of measurement values ​​are obtained. Based on the parameters in formula ①, the per-unit values ​​of the six sets of parameter measurements are calculated, and a parameter time series is constructed, forming a multidimensional time series matrix. The calculation results are as follows: .

[0028] Step S3: Calculate the relevant parameters required for the transient current's impact on the remaining electrical life of the high-voltage circuit breaker, and the influence factors of the relevant parameters required for the transient current's impact on the remaining electrical life of the high-voltage circuit breaker in the next time period. The calculation formula is: ③; In formula ③: For the first The influence factor of the transient current at one moment on the remaining electrical life of the high-voltage circuit breaker and the transient current at the next moment on the remaining electrical life of the high-voltage circuit breaker. for The per-unit value of the peak fault current of the high-voltage circuit breaker at any given time; for The duration of the fault current at any given moment; The rated breaking time of the circuit breaker; for The per-unit value of the fault current frequency of the high-voltage circuit breaker at any given time; This represents the effective value of the fundamental current of the high-voltage circuit breaker. High-voltage circuit breaker RMS value of subharmonic current; The impact factor is obtained based on the above data. .

[0029] Step S4: Based on the time series of relevant parameters required for calculating the influence index of transient current on the remaining electrical life of high-voltage circuit breakers, and the influence factors of the relevant parameters required for calculating the influence index of transient current on the remaining electrical life of high-voltage circuit breakers at the next moment, calculate... The predicted values ​​of relevant parameters required for the impact index of transient current at a given moment on the remaining electrical life of a high-voltage circuit breaker are calculated using the following formula: ④; In formula ④: for The per-unit value of the peak fault current of the high-voltage circuit breaker at any given time; for The predicted duration of the fault current at any given time; for The per-unit value of the fault current frequency of the high-voltage circuit breaker at any given time; for High-voltage circuit breaker Predicted value of the effective value of the subharmonic current.

[0030] Based on the above data, we obtain... Value at time: .

[0031] Step S5, Calculation Predicted value of the influence index of transient current at a given moment on the remaining electrical life of high-voltage circuit breakers This allows for the prediction of the impact index of transient current on the remaining electrical life of high-voltage circuit breakers. The calculation formula is as follows: ⑤.

[0032] Based on the above data, the following calculations were performed. .

[0033] Through real-time data acquisition, the peak fault current, rated carrying current, fault current duration, rated breaking time, fault current frequency, fundamental current RMS value, and other parameters of the high-voltage circuit breaker are obtained. The effective value of the subharmonic current is used, and some measured data are processed into per-unit values ​​to construct a parameter time series, forming a multi-dimensional time series matrix. The influence factor of the current monitoring parameter on the next monitoring parameter is calculated. Through the data processing module and the prediction module, the monitoring parameter value at the next time is predicted based on the parameter time series and the influence factor. Finally, using the predicted monitoring parameter value at the next time, the predicted value of the contact wear degree mutation probability index at the next time is calculated. Based on the predicted value, the maintenance strategy of the high-voltage circuit breaker is dynamically adjusted through the decision output module. If the predicted value of the transient current's influence index on the remaining electrical life of the high-voltage circuit breaker is less than 0.8 times the average value of the historical value of the transient current's influence index on the remaining electrical life of the high-voltage circuit breaker, the maintenance strategy will be adjusted accordingly. This can extend the maintenance cycle of high-voltage circuit breakers; if the predicted value of the sudden change probability index is less than or equal to 1.2 times the average historical value of the impact index of transient current on the remaining electrical life of high-voltage circuit breakers. The average historical value of the impact index of transient current greater than or equal to 0.8 times on the remaining electrical life of high-voltage circuit breakers. Then maintenance can be scheduled according to the normal rate of decay of the remaining electrical life of the high-voltage circuit breaker; if the predicted value of the transient current's impact on the remaining electrical life of the high-voltage circuit breaker is greater than 1.2 times the average value of the historical value of the transient current's impact on the remaining electrical life of the high-voltage circuit breaker... If the remaining electrical life of the high-voltage circuit breaker is degraded at an accelerated rate, the maintenance cycle of the high-voltage circuit breaker should be shortened.

[0034] Step S6: Assess the rate of decay of remaining battery life and dynamically adjust the maintenance cycle; Predicted value of the impact index of transient current on the remaining electrical life of high-voltage circuit breakers Less than If the remaining electrical life decay rate of the high-voltage circuit breaker decreases at the next moment, the maintenance cycle of the high-voltage circuit breaker should be appropriately extended. If the predicted value of the impact index of transient current on the remaining electrical life of high-voltage circuit breaker is greater than or equal to Less than or equal to If so, it can be determined that the maintenance can be arranged according to the normal rate of decay of the remaining electrical life of the high-voltage circuit breaker at the next moment. If the predicted value of the impact index of transient current on the remaining electrical life of high-voltage circuit breaker is greater than If the remaining electrical life of the high-voltage circuit breaker is degraded at an accelerated rate, the maintenance cycle of the high-voltage circuit breaker should be shortened.

[0035] Among them, the definition for Time to The average value of the transient current measured at time t is the index of the impact of the transient current on the remaining electrical life of the high-voltage circuit breaker.

[0036] A quantitative analysis system for the impact of transient current on the remaining electrical life of high-voltage circuit breakers, comprising a data acquisition module, a data processing module, a control module, and an output module; The data acquisition module is used to collect the peak value of the fault current, the duration of the fault current, the frequency of the fault current, and the effective values ​​of the fundamental and harmonic currents of the high-voltage circuit breaker in real time. The data processing module is used to construct parameter time series and calculate impact factors; The prediction module is used to predict the values ​​of relevant parameters at the next moment based on the time series of relevant parameters and influencing factors, and to calculate the impact index of transient current at the next moment on the remaining electrical life of high-voltage circuit breakers. The output module is used to output the remaining electrical life assessment results and maintenance recommendations.

[0037] This invention, for the first time, incorporates the frequency characteristics of fault current and waveform distortion characteristics caused by harmonics into the remaining electrical lifetime assessment system. It breaks through the limitations of traditional methods that only consider current amplitude. By constructing a comprehensive quantitative model, it can more realistically and comprehensively reflect the actual physical process of transient current erosion of contacts, fundamentally improving the scientific rigor of the assessment model and the accuracy of prediction results. By introducing dynamic influence factors and multi-parameter time series prediction models, the system can more accurately depict the decay trend of electrical lifetime. Compared with traditional methods based on simple counting and amplitude accumulation, this invention significantly reduces prediction errors, helping to accurately grasp the true health status of circuit breakers and providing reliable guarantees for the safe and stable operation of power systems. It can dynamically adjust maintenance cycles based on predicted impact indices, promoting the transformation of operation and maintenance models from traditional "periodic maintenance" to advanced "condition-based maintenance" and "predictive maintenance." When the prediction index is low, the maintenance interval can be appropriately extended to reduce operation and maintenance costs; when the prediction index is high, timely warnings can be issued and the maintenance cycle can be shortened, effectively preventing operational risks and achieving the best balance between safety and economy. By constructing a real-time data acquisition and closed-loop update process, the system can continuously track changes in the circuit breaker's operating status and automatically adjust the prediction model. This adaptive dynamic evaluation mechanism enables the system to adapt to different operating conditions and grid environments, ensuring that the evaluation results are always consistent with the actual situation, and has high engineering practical value and promotion value. The output quantitative impact index can serve as a key input parameter for the smart grid operation and maintenance system, providing reliable data support and decision-making basis for advanced applications such as circuit breaker life cycle management, precise allocation of spare parts, and risk prevention and control of the entire network operation, helping to build a more intelligent and efficient power equipment management system and promoting the construction of a smart grid.

Claims

1. A method for quantitatively analyzing the influence of transient current on the residual electric life of a high-voltage circuit breaker, characterized in that, The application relates to a method for evaluating the residual electric life of a high-voltage circuit breaker, comprising the following steps: S1, calculate the influence index of transient current on the residual electric life of high-voltage circuit breaker Based on the composition of the influence index, obtain the relevant parameter set required by the influence index Exponent of influence of transient current on residual electric life of high voltage circuit breaker The calculation formula is: ①； In formula 1: is a time interval, is a time interval, is a natural number, , is a time interval, is a time interval, and is a natural number, ; To The peak value of the fault current of the high-voltage circuit breaker at the moment; To The moment high-voltage circuit breaker fault current duration; Rated breaking time for high voltage circuit breakers; To The high-voltage circuit breaker fault current frequency standard value; Ie is the effective value of the fundamental current of the high voltage circuit breaker; For high voltage circuit breakers Subharmonic current effective value; S2, measuring relevant parameters and constructing a time sequence of the relevant parameters; S3, calculating an influence factor of the current time related parameter on the next time related parameter ; S4, predicting the value of the relevant parameters at the next moment based on the time sequence of the relevant parameters and influence factors; S5, calculating the index of the influence of the transient current at the next time on the residual electric life of the high-voltage circuit breaker ; S6, evaluating the residual electric life attenuation speed and dynamically adjusting the maintenance period.

2. The method according to claim 1, wherein The time sequence of the relevant parameters is calculated according to the following formula: ②； In formula 2, a fixed time is selected, the peak value of the fault current of the high-voltage circuit breaker is obtained by measurement, the fault current duration, the fault current frequency of the high-voltage circuit breaker, the effective value of the fundamental wave current of the high-voltage circuit breaker, the effective value of the high-voltage circuit breaker, and the effective value of the second harmonic current of the high-voltage circuit breaker are obtained. ​​​​​​​​ 3. The method of claim 1, wherein the method is characterized by: The influence factor of the current time related parameter on the next time related parameter The calculation formula is: ③； In formula 3: For the first Influence factor of the index of the transient current at the moment on the residual electric life of the high-voltage circuit breaker on the index of the transient current at the next moment on the residual electric life of the high-voltage circuit breaker To The peak value of the fault current of the high-voltage circuit breaker at the moment; for momentary fault current duration; Tc is the rated breaking time of the circuit breaker; To The high-voltage circuit breaker fault current frequency standard Ie is the effective value of the fundamental current of the high voltage circuit breaker; For high voltage circuit breakers Sub-harmonic current effective value.

4. The method of claim 1, wherein the method is characterized by: The value of the relevant parameters at the next moment is predicted based on the time sequence of the relevant parameters and influence factors according to the following formula: ④； In formula 4: To the moment the peak value of the fault current of the high voltage circuit breaker in units; For a prediction of the time-to-fault current duration; To the instantaneous high voltage circuit breaker fault current frequency reference value; To Instantaneous high voltage circuit breaker Prediction of the effective value of the subharmonic current.

5. The method of claim 1, wherein the method is characterized by: The transient current at the next moment influences an index of the residual electric life of the high-voltage circuit breaker The calculation formula is: ⑤。 6. The method of claim 1, wherein the method is characterized by: The residual electric life attenuation speed is evaluated and the maintenance period is dynamically adjusted according to the following formula: If , it is determined that the residual electric life attenuation speed of the high-voltage circuit breaker at the next moment is reduced, and the maintenance period of the high-voltage circuit breaker is extended. If then it is determined that the next time the maintenance is scheduled according to the normal high voltage circuit breaker residual electric life decay rate; If , it is determined that the high-voltage circuit breaker remaining electrical life attenuation speed is improved, and the maintenance period of the high-voltage circuit breaker is shortened. wherein is the average value of the measured transient current at the time instant t2influence index measurement value on the residual electrical life of the high voltage circuit breaker. the average value of the measured transient current at the time instant t2influence index measurement value on the residual electrical life of the high voltage circuit breaker.

7. The method of claim 1, wherein the method is characterized by: The related parameters include the peak value of fault current of the high-voltage circuit breaker in a set time period, the rated carrying current and the fault current duration of the high-voltage circuit breaker, the rated breaking time of the high-voltage circuit breaker, the fault current frequency of the high-voltage circuit breaker, the fundamental current effective value of the high-voltage circuit breaker, the high-voltage circuit breaker subharmonic current effective value.

8. A system for quantitative analysis of the effect of transient currents on the residual electric life of high voltage circuit breakers for implementing the method according to claims 1-7, characterized in that, The application further relates to a residual electric life evaluation device for a high-voltage circuit breaker, comprising a data acquisition module, a data processing module, a control module and an output module. The data acquisition module is used for collecting the fault current peak value, fault current duration, fault current frequency, fundamental wave and harmonic current effective value of the high-voltage circuit breaker in real time. The data processing module is used for constructing a parameter time sequence and calculating influence factors. The prediction module is used for predicting the value of the relevant parameters at the next moment based on the time sequence of the relevant parameters and influence factors, and calculating the influence index of the transient current at the next moment on the residual electric life of the high-voltage circuit breaker. The output module is used for outputting the residual electric life evaluation result and maintenance suggestion.

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