Wave recording method and system for intermittent fault

Abstract

The invention discloses an intermittent fault recording method and system. The method comprises the following steps: acquiring an electrical quantity characteristic signal in a target power distribution network, and judging whether a ground fault occurs in the target power distribution network according to the electrical quantity characteristic signal; if the grounding fault occurs, carrying out first wave recording operation, and carrying out first judgment; executing a second wave recording operation according to the first interpretation result, and performing a second judgment; and executing the first wave recording operation or the second wave recording operation or stopping wave recording according to the second judgment result. The method not only can ensure that intermittent fault key information is not lost, but also can prevent the intermittent fault from frequently starting instantaneous value sampling recording of a large data volume, and provides guarantee for subsequent fault and protection action analysis of a protection device.

Description

Technical Field

[0001] The present invention relates to the technical field of recording intermittent faults, and in particular to a recording method and system for intermittent faults. Background Art

[0002] The fault characteristics of single-phase grounding faults in distribution networks are complex, and the recording of various electrical quantity data is very important for the analysis of faults and protection actions. However, the data storage speed and storage capacity of the protection device are limited, and it is impossible to store all sampled data in real time. Therefore, existing protection equipment and distribution automation equipment generally only save instantaneous value sampling data before and after the fault and before and after the action, and only save effective value data during other fault durations, and no data is saved during non-fault periods.

[0003] The most common fault in the distribution network is the single-phase grounding fault. Intermittent grounding faults often occur due to the instability of the grounding arc. The interval between intermittent grounding faults often lasts for several cycles. If all the data before and after each intermittent fault occurs are saved, it will still be limited by the data storage speed and storage capacity of the existing protection device and cannot be realized. If only the last arcing recording data of the intermittent fault is saved, it is impossible to make a comprehensive analysis of the intermittent fault. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a method and system for recording intermittent faults, which can solve the problems mentioned in the background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides a method for recording an intermittent fault, comprising:

[0009] Acquire an electrical quantity characteristic signal in the target distribution network, and determine whether a ground fault occurs in the target distribution network according to the electrical quantity characteristic signal;

[0010] If a ground fault occurs, a first wave recording operation is performed and a first judgment is made;

[0011] Executing a second wave recording operation according to the first judgment result and making a second judgment;

[0012] The first recording operation or the second recording operation is performed or the recording is stopped according to the second judgment result.

[0013] As a preferred solution of the intermittent fault recording method of the present invention, if a ground fault occurs, performing a first recording operation and performing a first judgment include:

[0014] The first recording operation is any recording operation set by the user;

[0015] The first judgment is an arbitrary judgment criterion for determining whether the fault causes the protection device to operate.

[0016] As a preferred solution of the intermittent fault recording method of the present invention, the performing of the second recording operation according to the first judgment result and the second judgment comprises:

[0017] The second recording operation is any other recording operation set by the user except the first recording operation;

[0018] The second judgment is an arbitrary judgment criterion for determining whether a fault occurs again within the first preset fault detection time period.

[0019] As a preferred solution of the intermittent fault recording method of the present invention, the first judgment includes:

[0020] Determine the magnitude relationship between the ground fault duration and the protection action delay time;

[0021] If the duration of the ground fault is not greater than the protection action delay time, the second wave recording operation is directly performed;

[0022] If the ground fault duration is greater than the protection action delay time, it is determined whether the protection action has been executed.

[0023] As a preferred solution of the intermittent fault recording method of the present invention, the first judgment further includes:

[0024] If it has been executed, directly proceed to the second wave recording operation;

[0025] If not executed, the protection action is executed and the first wave recording operation is performed;

[0026] After the first wave recording operation is completed, the second wave recording operation will be directly entered.

[0027] As a preferred solution of the intermittent fault recording method of the present invention, the second judgment includes:

[0028] Determining whether a fault occurs again within a first preset fault detection time period;

[0029] If the fault does not occur again, stop recording.

[0030] As a preferred solution of the intermittent fault recording method of the present invention, the second judgment further includes:

[0031] If the fault occurs again, determine whether the fault result is consistent with the previous fault;

[0032] If they are consistent, it is determined that the intermittent fault continues, and the second wave recording operation is continued;

[0033] If they are inconsistent, stop recording and start the first recording operation for the new fault.

[0034] In a second aspect, the present invention provides a recording system for intermittent faults, comprising:

[0035] A fault judgment module is used to obtain an electrical quantity characteristic signal in the target distribution network, and judge whether a ground fault occurs in the target distribution network according to the electrical quantity characteristic signal;

[0036] A first judgment module, used for performing a first wave recording operation and making a first judgment if a ground fault occurs;

[0037] A second judgment module, used for executing a second wave recording operation and performing a second judgment according to the first judgment result;

[0038] The execution module is used to execute the first recording operation or the second recording operation or stop recording according to the second judgment result.

[0039] In a third aspect, the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned method when executing the computer program.

[0040] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the method described above when executed by a processor.

[0041] Compared with the prior art, the present invention has the following beneficial effects: the present invention proposes a recording method and system for intermittent faults, which obtains the characteristic signal of electrical quantity in the target distribution network, and judges whether a ground fault occurs in the target distribution network according to the characteristic signal of electrical quantity; if a ground fault occurs, a first recording operation is performed, and a first judgment is made; a second recording operation is performed according to the result of the first judgment, and a second judgment is made; the first recording operation or the second recording operation is performed or the recording is stopped according to the result of the second judgment. This method can not only ensure that the key information of intermittent faults is not lost, but also avoid the frequent initiation of instantaneous value sampling and recording of large amounts of data due to intermittent faults, and provide guarantee for the subsequent fault and protection action analysis of the protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0043] Figure 1 A method flow chart of an intermittent fault recording method and system provided by an embodiment of the present invention;

[0044] Figure 2 A detailed flow chart of a method and system for recording intermittent faults provided by an embodiment of the present invention;

[0045] Figure 3 A schematic diagram of an intermittent fault recording method and system provided by an embodiment of the present invention;

[0046] Figure 4 An internal structural diagram of a computer device of a method and system for recording intermittent faults provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0048] Example 1

[0049] Reference Figure 1-Figure 4 , which is the first embodiment of the present invention, provides a method and system for recording intermittent faults, including:

[0050] There are some problems in the existing related technologies. For example, when dealing with intermittent faults, due to the discontinuity of the faults, conventional recording methods often find it difficult to capture the exact moment when the fault occurs, resulting in incomplete recording of fault information.

[0051] The present application provides a method that can effectively solve the above-mentioned problems. Next, a plurality of embodiments will be combined to explain in detail how to implement the recording method of the intermittent fault.

[0052] Figure 1 A method flow chart of an intermittent fault recording method and system is shown, including:

[0053] S101, obtaining an electrical quantity characteristic signal in a target distribution network, and determining whether a ground fault occurs in the target distribution network according to the electrical quantity characteristic signal;

[0054] In an optional embodiment, the electrical quantity characteristic signals in the target distribution network may include electrical quantity characteristic signals such as bus three-phase voltage, zero-sequence voltage, feeder phase current, zero-sequence current, feeder zero-sequence current, etc. By analyzing the changes in these parameters, it is possible to accurately determine whether a ground fault occurs in the distribution network.

[0055] In an optional embodiment, various sensors and measuring devices (such as current transformers CT and voltage transformers PT) installed in the distribution network can be used to monitor the bus three-phase voltage, zero-sequence voltage, feeder phase current, zero-sequence current and other electrical quantity characteristic signals in real time.

[0056] In an optional embodiment, the electrical quantity characteristic signal may be obtained in other ways, for example, by receiving the electrical quantity characteristic signal data from a remote monitoring center through a communication network of the distribution network.

[0057] In the embodiment of the present application, the protection device with integrated sensor collects the system bus phase voltage, zero-sequence voltage, feeder phase current, and zero-sequence current in real time, and determines whether a ground fault occurs in the distribution network by analyzing the system bus phase voltage, zero-sequence voltage, feeder phase current, and zero-sequence current.

[0058] In an optional embodiment, multiple algorithms may be used to determine whether a ground fault occurs in the distribution network by analyzing the system bus phase voltage, zero-sequence voltage, feeder phase current, and zero-sequence current, such as a threshold-based judgment method, a pattern recognition algorithm, a machine learning algorithm, etc. These algorithms may comprehensively consider information such as the amplitude, frequency, and phase of the electrical quantity characteristic signal to improve the accuracy and reliability of fault judgment.

[0059] In an optional embodiment, when a threshold-based judgment method is used, the threshold needs to be reasonably set according to the actual grid operation conditions. Thresholds that are too high or too low will affect the accuracy of fault judgment. The appropriate threshold range can be determined by historical data and experimental data. Under different grid environments and operating conditions, the normal range of electrical quantities may be different, and the threshold needs to be adjusted regularly to adapt to different operating conditions. The impact of noise and interference in the grid on threshold judgment should be considered to ensure that faults can be accurately judged even in the presence of interference. A single threshold may not be accurate enough, and you can consider using a combination of multiple thresholds to improve the reliability of judgment, such as simultaneously monitoring the thresholds of zero-sequence voltage and zero-sequence current.

[0060] In an optional embodiment, when using a pattern recognition algorithm, selecting appropriate features is crucial to the accuracy of pattern recognition. Common features include the amplitude, frequency, phase, harmonic components, etc. of voltage and current. The selection of features needs to be based on a deep understanding of the physical characteristics of the fault. The quality of training data directly affects the effect of pattern recognition. A large amount of real fault data and normal operation data needs to be collected and labeled. The model needs to have good generalization ability and be able to perform well on unseen data. The generalization ability of the model can be evaluated by methods such as cross-validation. The pattern recognition algorithm needs to run in a real-time environment, so it is necessary to ensure that the computational complexity of the algorithm is moderate and that fault judgment can be completed in a short time.

[0061] In an optional embodiment, when a machine learning algorithm is used, a large amount of high-quality data is required to train the model. The data should cover various fault types and operating conditions to ensure the robustness of the model. Feature engineering is a key step in machine learning, and it is necessary to select and extract features that can effectively describe the fault characteristics. The selection and processing of features have a great impact on the performance of the model. Select a suitable machine learning model according to the characteristics of the problem, such as decision trees, support vector machines, neural networks, etc. Different models may perform differently in different application scenarios. Tune the model through cross-validation, grid search and other methods to find the best hyperparameter combination.

[0062] In an optional embodiment, other methods can also be used to analyze the system bus phase voltage, zero-sequence voltage, feeder phase current, and zero-sequence current to determine whether a ground fault has occurred in the distribution network, for example, through an expert system or a rule-based reasoning method. The expert system can integrate the knowledge and experience of domain experts and simulate the expert's decision-making process through a series of predefined rules. These rules are based on the logic and experience of fault diagnosis and can handle complex fault conditions. The rule-based reasoning method usually includes three main parts: a fact base, a rule base, and a reasoning engine. The fact base stores the current status information of the system, the rule base contains rules for diagnosis, and the reasoning engine is responsible for applying the rules in the rule base to derive conclusions. In this way, the system can analyze the characteristic signals of the electrical quantity of the distribution network and determine whether there is a ground fault.

[0063] It should be noted that the present application does not limit the method of analyzing the system bus phase voltage, zero-sequence voltage, feeder phase current, and zero-sequence current to determine whether a ground fault has occurred in the distribution network. However, the results are all obtained by analyzing the system bus phase voltage, zero-sequence voltage, feeder phase current, and zero-sequence current. Therefore, in related designs, if other technicians use similar technical means to determine ground faults, they should also be within the scope of protection of the present application.

[0064] In the embodiment of the present application, one or more thresholds can be set. When the monitored electrical quantity characteristic signal exceeds these thresholds, the system will determine that a ground fault has occurred. For example, a zero-sequence voltage threshold can be set. When the zero-sequence voltage exceeds the threshold, the system believes that a ground fault has occurred in the distribution network. In addition, time factors can also be combined. For example, only when the electrical quantity characteristic signal exceeds the threshold for a certain period of time, it is considered that a real fault has occurred, so as to avoid misjudgment caused by transient interference.

[0065] Exemplarily, determining whether a ground fault occurs: the device detects a zero-sequence voltage The amplitude exceeds the set threshold ( Generally set to 15% of the phase power supply voltage) When , it is determined that a ground fault occurs.

[0066] S102, if a ground fault occurs, performing a first wave recording operation and making a first judgment;

[0067] In the embodiment of the present application, if a ground fault occurs, a first wave recording operation is performed, and a first judgment is performed including:

[0068] The first recording operation is any recording operation set by the user;

[0069] The first judgment is an arbitrary judgment criterion for determining whether the fault causes the protection device to be actuated.

[0070] In an optional embodiment, a variety of recording strategies may be used for distribution network fault recording operations. For example, it may be configured to start recording immediately when a fault occurs, or to start recording after a certain period of time after the fault occurs.

[0071] In an optional embodiment, the recording operation can be continuous or periodic to meet different fault detection requirements. The recording data can be stored in a local storage device or transmitted to a remote server via a network for further analysis and storage.

[0072] In an optional embodiment, the storage and transmission of the recording data may use encryption technology to ensure the security and privacy of the data. When making the first judgment, a preset logical judgment rule may be used. For example, if the fault causes the protection device to operate, it is considered to be a valid fault event, otherwise it may be a false alarm. The result of the first judgment may be used to trigger subsequent fault handling processes, such as alarming, isolating the fault area, starting the backup system, etc.

[0073] In the embodiment of the present application, the first judgment is any judgment criterion for whether the fault causes the protection device to operate. The first judgment can adopt a preset protection judgment logic, a preset neural network, a preset expert system rule, or any other logical judgment method. For example, a logical judgment rule can be set, and when the detected electrical quantity characteristic signal meets a specific condition, the system will judge that the protection device is operating.

[0074] In an optional embodiment, the first judgment may also be combined with information such as the time and duration of the fault, and the system state before and after the fault occurs, so as to improve the accuracy and reliability of the judgment. The result of the first judgment will directly affect the initiation of the fault handling process, so its accuracy and timeliness are crucial. In practical applications, the implementation of the first judgment can be flexible and diverse to adapt to different power grid environments and operating conditions.

[0075] In the embodiment of the present application, the first judgment is designed using a preset protection judgment logic, and the first judgment includes:

[0076] Determine the relationship between the duration of the ground fault and the protection action delay time;

[0077] If the duration of the ground fault is not longer than the protection action delay time, the second wave recording operation is performed directly;

[0078] If the ground fault duration is greater than the protection action delay time, it is determined whether the protection action has been executed.

[0079] In the embodiment of the present application, the first judgment further includes:

[0080] If it has been executed, directly proceed to the second wave recording operation;

[0081] If not executed, the protection action is executed and the first wave recording operation is performed;

[0082] After the first wave recording operation is completed, the second wave recording operation will be directly entered.

[0083] In an optional embodiment, the first recording operation can select instantaneous value recording. Instantaneous value recording refers to recording the instantaneous value of the characteristic signal of the electrical quantity immediately when the fault occurs. This recording method can capture detailed information at the moment of the fault, which is very helpful for analyzing the cause and process of the fault. Instantaneous value recording can provide data with high time resolution, which is especially important for rapidly changing fault signals. In addition, instantaneous value recording can also be used for subsequent fault analysis and diagnosis, helping engineers understand the dynamic characteristics of the fault, thereby improving the system's protection strategy and improving the system's reliability.

[0084] In an optional embodiment, the first recording operation can also select average value recording. Average value recording refers to the data recorded after the electrical quantity characteristic signal is averaged within a certain time window. This recording method can reduce the impact of random noise, provide a smoother signal curve, and help identify and analyze the long-term trends and patterns of faults. Average value recording is particularly suitable for analyzing fault signals that change more slowly, and can help engineers identify potential system performance degradation or long-term fault development trends. In this way, the system can perform a more comprehensive analysis of the electrical quantity characteristic signals of the distribution network and determine whether there is a ground fault.

[0085] In an optional embodiment, the first recording operation can also select other recording methods, such as peak value recording, effective value recording, etc. Peak value recording focuses on the maximum value of the signal, which helps to detect and analyze abnormal peaks that may occur during faults. Effective value recording focuses on the average energy level of the signal, which is suitable for evaluating the impact of faults on the long-term operation of the system. Each recording method has its specific application scenarios and advantages, and can be selected according to actual needs. For example, in situations where rapid response and accurate fault location are required, instantaneous value recording may be the first choice; in situations where the long-term stability and trend of the system need to be analyzed, average value recording may be more appropriate. By flexibly using different recording technologies, intermittent fault problems in the distribution network can be more comprehensively understood and handled.

[0086] In the embodiment of the present application, the first recording operation is instantaneous value recording.

[0087] It should be noted that if a ground fault occurs, the first recording operation and the first judgment can quickly capture the instantaneous information of the fault, providing key data for subsequent fault analysis and processing. The high time resolution characteristics of the instantaneous value recording make it particularly effective in analyzing rapidly changing fault signals, helping engineers to quickly locate the fault point and take corresponding measures. In addition, since the instantaneous value recording can record detailed information when the fault occurs, it plays an irreplaceable role in understanding the cause and process of the fault. In this way, the system can respond to and record the details of the fault in a timely manner, providing solid data support for the diagnosis and processing of the fault.

[0088] S103, performing a second wave recording operation according to the first determination result, and performing a second determination;

[0089] In the embodiment of the present application, performing a second wave recording operation according to the first judgment result, and performing a second judgment includes:

[0090] The second recording operation is any other recording operation set by the user except the first recording operation;

[0091] The second judgment is an arbitrary judgment criterion for determining whether the fault occurs again within the first preset fault detection time period.

[0092] In an optional embodiment, the second recording operation may adopt other recording modes besides instantaneous value recording, for example, effective value recording, peak value recording, average value recording, etc., and relevant technicians may select according to actual needs;

[0093] In the embodiment of the present application, the second recording operation is effective value recording.

[0094] In an optional embodiment, the second judgment is any judgment criterion for whether a fault occurs again within the first preset fault detection time period. The second judgment can adopt a preset protection judgment logic, a preset neural network, a preset expert system rule or any other logical judgment method. For example, a logical judgment rule can be set, and when the detected electrical quantity characteristic signal meets a specific condition again within the first preset fault detection time period, the system will judge that the fault has occurred again. The result of the second judgment will determine whether further fault handling measures are required, such as restarting the backup system or conducting a more in-depth fault analysis. The purpose of the second recording operation is to capture detailed information about the system state after the fault occurs, so as to facilitate subsequent fault analysis and diagnosis. The effective value recording can provide the average energy level of the system within a period of time after the fault occurs, which is very helpful for evaluating the impact of the fault on the long-term operation of the system. Through the effective value recording, the impact of the fault on the system performance can be more accurately analyzed, thereby providing a basis for the maintenance and upgrade of the system. In practical applications, the implementation method of the second recording operation can also be flexible and diverse to adapt to different power grid environments and operating conditions.

[0095] In the embodiment of the present application, the second judgment is designed using a preset protection judgment logic, and the second judgment includes:

[0096] Determining whether a fault occurs again within a first preset fault detection time period;

[0097] If the fault does not occur again, stop recording.

[0098] In the embodiment of the present application, the second judgment further includes:

[0099] If the fault occurs again, determine whether the fault result is consistent with the previous fault;

[0100] If they are consistent, it is determined that the intermittent fault continues, and the second wave recording operation is continued;

[0101] If they are inconsistent, stop recording and start the first recording operation for the new fault.

[0102] In an optional embodiment, if a fault occurs again but the fault result is inconsistent with the last time, it indicates that the fault type has changed, and the system will start the corresponding recording operation according to the new fault characteristics. This flexible fault response mechanism ensures that the system can adapt to different types of fault conditions, thereby improving the accuracy and efficiency of fault handling. In this way, the system can not only handle intermittent faults, but also cope with changes in fault types to ensure the stable operation of the power grid.

[0103] In an optional embodiment, the system can also record detailed information about each fault, including the time, duration, and type of fault, which are of great reference value for subsequent fault analysis and the formulation of preventive measures. Through continuous monitoring and analysis, the system can continuously learn and optimize, making future fault handling more efficient and accurate.

[0104] It should be noted that performing the second recording operation according to the first judgment result and making the second judgment can realize continuous monitoring and analysis of faults, ensuring that measures can be taken quickly after the fault occurs to reduce the impact of the fault on the power grid. In addition, by recording detailed information of the fault, the system can accumulate fault cases and provide data support for future fault prevention and handling. This analysis and learning mechanism based on historical data helps to improve the reliability and safety of the power grid. In practical applications, the system can also automatically adjust the recording strategy and fault handling process according to the real-time status of the power grid and historical fault data to adapt to the dynamic changes in the operation of the power grid. In this way, the system can not only respond to faults quickly, but also continuously optimize its own fault handling capabilities, providing strong guarantees for the stable operation of the power grid.

[0105] S104, executing the first recording operation or the second recording operation or stopping the recording according to the second judgment result.

[0106] In an optional embodiment, if the second judgment result indicates that the fault persists, the second recording operation is continued to capture the changes in the system state during the duration of the fault; if the second judgment result indicates that the fault has disappeared, the recording is stopped to avoid unnecessary resource consumption; if the second judgment result indicates that the fault type has changed, the corresponding recording operation is started according to the new fault characteristics to adapt to the new fault situation. This flexible operation mechanism based on real-time judgment ensures that the system can take the most appropriate response measures according to the actual situation of the fault. In this way, the system can effectively manage intermittent faults while maintaining continuous monitoring of the operating status of the power grid to ensure the stability and reliability of the power grid. In actual applications, the system can also combine the real-time data and historical fault records of the power grid to dynamically adjust the recording strategy to achieve precise control of the operating status of the power grid and efficient handling of faults.

[0107] In an optional embodiment, if Figure 2 As shown, at the beginning, the protection device collects the system bus phase voltage, zero-sequence voltage, feeder phase current, and zero-sequence current in real time. Step 201, determine whether a ground fault occurs: the device detects a zero-sequence voltage The amplitude exceeds the set threshold ( Generally set to 15% of the phase power supply voltage) When the ground fault occurs, it is determined that a ground fault occurs and step 202 is executed. Otherwise, the process returns to the beginning of the process and the protection device is used to collect the system bus phase voltage, zero-sequence voltage, feeder phase current, and zero-sequence current in real time. The device determines that the fault result is fault n; step 202, start instantaneous value recording, and record the instantaneous value data of N cycles before and after the fault occurs;

[0108] In step 203, the device determines whether the fault duration is greater than the protection action delay time. If it is greater than and the protection action 204 has not been executed, step 205 is executed; if it is greater but the protection action 204 has been executed, effective value recording is performed and step 208 is executed; if it is not greater than the protection action delay time, effective value recording is performed and step 209 is executed.

[0109] Steps 206-207, the device executes the protection action and starts the instantaneous value recording to record the instantaneous value data of N cycles before and after the protection action;

[0110] Step 210: After the device determines that the fault disappears, it detects whether a new fault occurs within the intermittent fault detection time window:

[0111] If no new fault occurs, the effective value recording is stopped and the fault is restored 212; if a new fault occurs 213, and the new fault judgment result of the device is still fault n, it is judged as an intermittent fault continuation 215, the effective value recording is continued 216, and the process returns to step 203; if a new fault occurs and the device judgment result is fault m (m≠n), the effective value recording is stopped, the fault is restored, and the fault m recording is started 214, and the process returns to step 202.

[0112] In an optional embodiment, if Figure 3 As shown, the specific recording operations taken during the implementation of this method are shown. When the fault starts, the instantaneous value recording is used, and when the fault disappears, the effective value recording is used. After determining whether a protection action is generated, the instantaneous value recording and the effective value recording are switched. In this way, the system can respond to various complex fault conditions more flexibly, providing strong technical support for the safe and stable operation of the power grid.

[0113] In summary, the present invention proposes a recording method for intermittent faults, which obtains the characteristic signal of electrical quantities in the target distribution network, and judges whether a ground fault occurs in the target distribution network according to the characteristic signal of electrical quantities; if a ground fault occurs, a first recording operation is performed, and a first judgment is made; a second recording operation is performed according to the first judgment result, and a second judgment is made; the first recording operation or the second recording operation is performed or the recording is stopped according to the second judgment result. The most important instantaneous sampling value data before and after the first arcing and the instantaneous sampling value data before and after the protection action in the intermittent grounding fault can be saved, and the instantaneous value recordings of other arcing are discarded and replaced with effective value recordings. This method can not only ensure that the key information of intermittent faults is not lost, but also avoid the frequent initiation of instantaneous value sampling and recording of large amounts of data due to intermittent faults, thereby providing a guarantee for the subsequent fault and protection action analysis of the protection device.

[0114] This embodiment also provides a recording system for intermittent faults, including:

[0115] A fault judgment module is used to obtain an electrical quantity characteristic signal in the target distribution network and judge whether a ground fault occurs in the target distribution network according to the electrical quantity characteristic signal;

[0116] A first judgment module, used for performing a first wave recording operation and making a first judgment if a ground fault occurs;

[0117] A second judgment module, used for executing a second wave recording operation and performing a second judgment according to the first judgment result;

[0118] The execution module is used to execute the first recording operation or the second recording operation or stop recording according to the second judgment result.

[0119] The above-mentioned unit modules may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above-mentioned modules.

[0120] This embodiment also provides a computer device, which may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 4As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for recording intermittent faults is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0121] This embodiment further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0122] Obtaining an electrical quantity characteristic signal in a target distribution network, and determining whether a ground fault occurs in the target distribution network according to the electrical quantity characteristic signal;

[0123] If a ground fault occurs, a first wave recording operation is performed and a first judgment is made;

[0124] Executing a second wave recording operation according to the first judgment result and making a second judgment;

[0125] The first recording operation or the second recording operation is performed or the recording is stopped according to the second judgment result.

[0126] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0127] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0128] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0129] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0130] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0131] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0132] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for recording intermittent faults, characterized in that: include: Acquire an electrical quantity characteristic signal in the target distribution network, and determine whether a ground fault occurs in the target distribution network according to the electrical quantity characteristic signal; If a ground fault occurs, a first wave recording operation is performed and a first judgment is made; Executing a second wave recording operation according to the first judgment result and making a second judgment; The first recording operation or the second recording operation is performed or the recording is stopped according to the second judgment result.

2. The recording method of intermittent faults according to claim 1, characterized in that: If a ground fault occurs, performing a first wave recording operation and performing a first judgment include: The first recording operation is any recording operation set by the user; The first judgment is an arbitrary judgment criterion for determining whether the fault causes the protection device to operate.

3. The recording method of intermittent faults according to claim 2, characterized in that: The performing of the second wave recording operation according to the first interpretation result and performing the second judgment comprises: The second recording operation is any other recording operation set by the user except the first recording operation; The second judgment is an arbitrary judgment criterion for determining whether a fault occurs again within the first preset fault detection time period.

4. The method for recording intermittent faults according to claim 3, characterized in that: The first judgment includes: Determine the magnitude relationship between the ground fault duration and the protection action delay time; If the duration of the ground fault is not greater than the protection action delay time, the second wave recording operation is directly performed; If the ground fault duration is greater than the protection action delay time, it is determined whether the protection action has been executed.

5. The recording method of intermittent faults according to claim 4, characterized in that: The first judgment also includes: If it has been executed, directly proceed to the second wave recording operation; If not executed, the protection action is executed and the first wave recording operation is performed; After the first wave recording operation is completed, the second wave recording operation will be directly entered.

6. The method for recording intermittent faults according to claim 5, characterized in that: The second judgment includes: Determining whether a fault occurs again within a first preset fault detection time period; If the fault does not occur again, stop recording.

7. The method for recording intermittent faults according to claim 6, characterized in that: The second judgment also includes: If the fault occurs again, determine whether the fault result is consistent with the previous fault; If they are consistent, it is determined that the intermittent fault continues, and the second wave recording operation is continued; If they are inconsistent, stop recording and start the first recording operation for the new fault.

8. A recording system for intermittent faults, characterized in that: include: A fault judgment module is used to obtain an electrical quantity characteristic signal in the target distribution network, and judge whether a ground fault occurs in the target distribution network according to the electrical quantity characteristic signal; A first judgment module, used for performing a first wave recording operation and making a first judgment if a ground fault occurs; A second judgment module, used for executing a second wave recording operation and performing a second judgment according to the first judgment result; The execution module is used to execute the first recording operation or the second recording operation or stop recording according to the second judgment result.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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