Circuit protection method based on fault current prediction and related product

Abstract

The invention discloses a circuit protection method based on fault current prediction and related products, and belongs to the technical field of circuit protection, and the method comprises the steps: obtaining a current instantaneous value at a current moment and a current instantaneous value at a corresponding historical moment in real time, and calculating a current value at the current moment and the measurement precision of the current value at the current moment in real time; when the measurement precision of the current value at the current moment is greater than the response precision of the current fault, the current fault is established, and the calculation of the measurement precision of the current value at the current moment is stopped; after the fault current fluctuation time is delayed, the stable fluctuation of the current value at the current moment is calculated in real time; when the stable fluctuation of the current value at the current moment is smaller than a preset value, entering a current fault stable state, and obtaining a predicted fault current value; based on the predicted fault current value, the circuit is protected; the accuracy and response speed of fault current prediction are improved, so that circuit protection can respond to faults in the shortest time, and meanwhile, false alarms and missing alarms are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit protection, and relates to a circuit protection method based on fault current prediction and related products. Background Art

[0002] In the operation of power systems, the detection and prediction of fault currents are key to ensuring system stability and safety. Fault currents usually refer to abnormal current phenomena caused by equipment failure, short circuits or overloads. If these phenomena are not discovered and handled in a timely manner, they may cause equipment damage, fires, or even larger-scale power grid accidents. Therefore, the development of accurate and efficient circuit protection methods based on fault current prediction is crucial for the maintenance and management of power systems.

[0003] Traditionally, fault current detection mainly relies on hardware devices such as current transformers, which monitor the current value in real time and compare it with the preset threshold to determine whether there is a fault. However, this method is limited by hardware performance, environmental interference, and the subjectivity of threshold setting, and it is often difficult to provide accurate early warning information at the beginning of the fault. In addition, with the development of smart grids, higher requirements are placed on the prediction accuracy and response speed of fault currents, and traditional detection methods can no longer meet these requirements. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of low prediction accuracy and slow response speed of fault current when protecting circuits in the prior art, and to provide a circuit protection method based on fault current prediction and related products.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A first aspect of the present invention discloses a circuit protection method based on fault current prediction, comprising the following steps: Obtain the instantaneous current value at the current moment and the corresponding instantaneous current value at the historical moment in real time; Based on the instantaneous current value at the current moment and the instantaneous current value at the historical moment, the current value at the current moment is calculated in real time, and the current value at the corresponding historical moment is obtained at the same time; Based on the current value at the current moment and the current value at the corresponding historical moment, the measurement accuracy of the current value at the current moment is calculated in real time; When the current value measurement accuracy at the current moment is greater than the current fault response accuracy, the current fault is established, the calculation of the current value measurement accuracy at the current moment is stopped, and the fault current fluctuation time is delayed; Based on the delayed current value at the current moment and the current value at the corresponding historical moment, the stable fluctuation of the current value at the current moment is calculated in real time; when the stable fluctuation of the current value at the current moment is less than the preset value, the current fault stable state is entered; Obtaining a stable current in a stable state of a current fault, and using the stable current in the stable state of the current fault as a predicted fault current value; The circuit is protected based on the predicted fault current value.

[0006] Preferably, the real-time calculation of the current value at the current moment adopts a first differential three sampling point method.

[0007] Preferably, the measurement accuracy of the current value at the current moment is described as:

[0008] in, is the measurement accuracy of the current value at the current moment n; is the current value at the current moment n, is the average current value of the K moments before the current moment n.

[0009] Preferably, the stable fluctuation of the current value at the current moment is described as:

[0010] in, is the stable fluctuation of the current value at the current moment n; is the current value at the current moment n, is the average current value of the K moments before the current moment n.

[0011] Furthermore, the current fault response accuracy is preset according to actual needs and is a critical value for the establishment of a current fault.

[0012] Furthermore, the current fault fluctuation time is the time from when the current fault occurs to when the fault current enters a stable state.

[0013] A second aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned circuit protection method based on fault current prediction when executing the computer program.

[0014] A third aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the circuit protection method based on fault current prediction is implemented.

[0015] A fourth aspect of the present invention provides a computer program product, the computer program product comprising computer instructions, the computer instructions instructing a computer to execute the above-mentioned circuit protection method based on fault current prediction.

[0016] A fifth aspect of the present invention provides a circuit protection system based on fault current prediction, comprising: A data acquisition module is used to obtain the instantaneous current value at the current moment and the instantaneous current value at the corresponding historical moment in real time; The current value calculation module is used to calculate the current value at the current moment in real time based on the instantaneous current value at the current moment and the instantaneous current value at the historical moment, and simultaneously obtain the current value at the corresponding historical moment; The current value accuracy calculation module is used to calculate the measurement accuracy of the current value at the current moment in real time based on the current value at the current moment and the current value at the corresponding historical moment; The fault establishment judgment module is used to determine that when the current value measurement accuracy is greater than the current fault response accuracy, the current fault is established, stop the calculation of the current value measurement accuracy at the current moment, and delay the fault current fluctuation time; The fault current steady-state judgment module is used to calculate the stable fluctuation of the current value at the current moment in real time based on the current value at the current moment after delay and the current value at the corresponding historical moment; when the stable fluctuation of the current value at the current moment is less than the preset value, the current fault stable state is entered; A fault current prediction module is used to obtain a stable current in a stable state of a current fault, and use the stable current in the stable state of the current fault as a predicted fault current value; The circuit protection module is used to protect the circuit based on the predicted fault current value.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a circuit protection method based on fault current prediction, which calculates the current value at the current moment based on the current and historical current instantaneous values, and takes into account the changing trend of the current over time, so that the calculated current value is closer to the actual situation. By comparing the measurement accuracy of the current value at the current moment with the current fault response accuracy, it is ensured that only when the measurement accuracy is high enough, that is, when the current change rate is too large, the fault may be considered to be established and subsequent fault judgment is performed, thereby improving the accuracy of the prediction; a delay mechanism for the current fault fluctuation time is introduced. This design aims to wait for the current fluctuation to stabilize before making a fault judgment, avoiding false alarms caused by instantaneous current fluctuations; the delay mechanism also ensures that when a fault actually occurs, the cross-border current instantaneous value data before and during the fault can be avoided to avoid calculating the wrong fault current value; by calculating the stable value fluctuation of the current value at the current moment and comparing it with the preset value, it is possible to accurately determine whether the current has entered the fault stable state; once entering the fault stable state, the predicted fault current value can be obtained, which is not only stable and reliable, but also can provide an important reference for subsequent fault handling; according to the predicted fault current value, the circuit is protected, and measures can be taken in advance to effectively prevent the fault current from damaging the circuit equipment, which not only improves the response speed of the circuit protection, but also reduces the equipment damage and maintenance costs caused by the fault, and improves the stability and safety of the entire circuit system.

[0018] Furthermore, the present invention discloses a circuit protection system based on fault current prediction, in which the data acquisition module can capture the instantaneous current value at the current moment and the historical moment in real time, providing a reliable data basis for subsequent current value calculation and fault judgment. This real-time data acquisition capability ensures that the system can respond quickly to current changes and improves the timeliness of fault detection. The current value calculation module uses the instantaneous current value at the current moment and the historical moment to calculate the current value at the current moment in real time, which not only improves the accuracy of the current value, but also provides strong data support for the judgment of fault establishment. The current value accuracy calculation module evaluates the measurement accuracy of the current current value in real time, ensures the accuracy and reliability of the data, provides an accurate basis for fault judgment, and reduces false alarms and missed alarms. The fault establishment judgment module can quickly determine whether the current has a fault by calculating the measurement accuracy of the current value at the current moment in real time and comparing it with the preset current fault response accuracy. Once the measurement accuracy exceeds the fault response accuracy, the system immediately determines that the fault is established, stops further measurement accuracy calculation, and starts the delay mechanism of the fault current fluctuation time at the same time, reserving time for subsequent steady-state analysis. The fault current steady-state judgment module calculates the stable fluctuation of the current in real time based on the current value after the delay. When the fluctuation is less than the preset value, the system enters the current fault stable state, providing a stable data environment for the prediction of the fault current. The fault current prediction module accurately predicts the fault current value in the current fault stable state, providing a reliable decision-making basis for circuit protection, and effectively improving the accuracy and timeliness of protection. Based on the predicted fault current value, the circuit protection module quickly starts circuit protection measures, such as cutting off the power supply, starting the backup circuit, etc., effectively preventing the fault current from damaging the circuit equipment and ensuring the stable operation of the circuit system. It can minimize the impact of the fault on the equipment and system while ensuring the circuit safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a flowchart of a circuit protection method based on fault current prediction of the present invention; Figure 2 A block diagram of a circuit protection system based on fault current prediction according to the present invention; Figure 3 The transient waveform of the current when the phase angle is 0 degrees in the embodiment of the present invention; Figure 4 This is the transient waveform of the current when the current phase angle is 40 degrees in the embodiment of the present invention; Figure 5 This is the transient waveform of the current when the current phase angle is 70 degrees in the embodiment of the present invention; Figure 6 It is the transient waveform when the current phase angle is 95 degrees according to the embodiment of the present invention.

[0021] Among them: 201 - data acquisition module; 202 - current value calculation module; 203 - current value accuracy calculation module; 204 - fault establishment judgment module; 205 - fault current steady-state judgment module; 206 - fault current prediction module; 207 - circuit protection module. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and marked in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1 The present invention proposes a circuit protection method based on fault current prediction, comprising the following steps: S1, real-time acquisition of the instantaneous current value at the current moment and the instantaneous current value at the corresponding historical moment; by real-time acquisition of the instantaneous current value at the current moment, and at the same time acquiring the instantaneous current value at the corresponding historical moment from the database.

[0025] S2, based on the instantaneous current value at the current moment and the instantaneous current value at the historical moment, calculate the current value at the current moment in real time, and obtain the current value at the corresponding historical moment at the same time; it can be understood that this process is a real-time calculation process, that is, the current value is calculated for each current moment, and at the same time, the current value of each historical moment corresponding to the current moment is obtained from the database. S3, based on the current value at the current moment and the current value at the historical moment, the measurement accuracy of the current value at the current moment is calculated in real time; the measurement accuracy of the current value at the current moment is calculated in real time by using the current value at the current moment calculated and the current value calculated at the historical moment stored in the database; S4, when the current value measurement accuracy is greater than the current fault response accuracy, the current fault is established, and the calculation of the current value measurement accuracy is stopped; and the fault current fluctuation time is delayed; after each calculation of the current value measurement accuracy, the current value measurement accuracy is compared with the current fault response accuracy. When the current value measurement accuracy is greater than the current fault response accuracy, the current fault is established, and the calculation of the current value measurement accuracy is stopped; when the current value measurement accuracy is less than or equal to the current fault response accuracy, the current fault is continued to be calculated in real time until the current value measurement accuracy is greater than the current fault response accuracy, and the calculation is stopped; at this time, the current fault is established; once the current fault is established, a delay of a fault current fluctuation time is started.

[0026] S5, based on the delayed current value at the current moment and the current value at the corresponding historical moment, calculate the stable fluctuation of the current value at the current moment in real time; when the stable fluctuation of the current value at the current moment is less than the preset value, enter the current fault stable state.

[0027] S6, in the current fault stable state, obtain the stable current value at this time and use it as the predicted fault current value. The predicted value will be used for subsequent circuit protection decisions.

[0028] S7, based on the predicted fault current value, protect the circuit, that is, take corresponding protection measures (such as cutting off the circuit, starting the backup power supply, sending an alarm, etc.) to prevent the circuit fault from further developing and expanding.

[0029] The circuit protection method based on fault current prediction of the present invention collects the instantaneous current value at the current moment in real time, and at the same time, obtains the instantaneous current value at the historical moment from the database, and calculates the current value at the current moment in real time based on the instantaneous current value at the current moment and the instantaneous current value at the historical moment. This process is a dynamic update process, which ensures that accurate current value calculation can be performed at each current moment; by comparing the current value calculated at the current moment with the current value calculated at the historical moment stored in the database, the measurement accuracy of the current value at the current moment is calculated in real time; the measurement accuracy of the calculated current value at the current moment is compared with the preset current fault response accuracy. When the measurement accuracy is greater than the current fault response accuracy, it is considered that the current fault is established and the operation is stopped immediately. The measurement accuracy of the current value at the current moment is calculated; if the measurement accuracy is less than or equal to the current fault response accuracy, the measurement accuracy of the current value at the current moment continues to be calculated in real time until a fault is detected; after the current fault is detected, since the fault current fluctuates at this time, directly predicting the fault current will result in a large error, so the present invention delays the fault current fluctuation time and skips the influence of the fault current fluctuation on the fault current prediction accuracy; after skipping the fault current fluctuation time, the present invention calculates the stable fluctuation of the current in real time to further ensure that the final state of the current is stable, and at this time, the current value at the current moment is recorded as the predicted fault current value; according to the predicted fault current value, the circuit can be protected, such as powering off, starting the backup power supply or sending an alarm.

[0030] An embodiment of the present invention provides a circuit protection method based on fault current prediction, comprising the following steps: S1, real-time acquisition of the instantaneous current value at the current moment and the instantaneous current value at the corresponding historical moment; The instantaneous current value at the current moment is collected in real time through the current sensor installed in the power system, and the instantaneous current value records in the past period of time are obtained from the data storage system of the power system as the instantaneous current value data at the historical moment.

[0031] S2, based on the instantaneous current value at the current moment and the instantaneous current value at the historical moment, calculate the current value at the current moment in real time; based on each instantaneous current value at the current moment and the instantaneous current value at the historical moment, use the first differential three sampling point method to calculate the current value at the current moment in real time And at the same time obtain the current value at the corresponding historical moment.

[0032] S3, based on the current value at the current moment and the current value at the corresponding historical moment, the measurement accuracy of the current value at the current moment is calculated in real time; when the measurement accuracy of the current value at the current moment is greater than the current fault response accuracy, the current fault is established, and the calculation of the measurement accuracy of the current value at the current moment is stopped; and the fault current fluctuation time is delayed; the measurement accuracy of the current amplitude at the current moment is described as:

[0033] in, is the current value at the current moment, is the average value of the current values ​​at the K moments before the current moment. In this embodiment, the value of K is 4.

[0034] As an example, the current fault response accuracy can be preset according to actual needs, which is the critical value of the current fault. In this embodiment, the current fault response accuracy is 12%, that is, when the current value measurement accuracy at the current moment is When the current fault occurs, the fault delay mechanism is started, that is, the fault current fluctuation time is delayed.

[0035] S4, based on the current value at the current moment after the delay and the current value at the corresponding historical moment, calculate the stable fluctuation of the current value at the current moment in real time; when the stable value fluctuation of the current value at the current moment is less than the preset value, enter the current fault stable state, obtain the stable current of the current fault stable state, and use the stable current of the current fault stable state as the predicted fault current value; based on the predicted fault current value, protect the circuit.

[0036] Delay a preset current fault fluctuation time; this delay is to ensure that the current fluctuation has stabilized and avoid misjudgment due to instantaneous fluctuations; in this embodiment, the current fault fluctuation time is selected as 1.3ms.

[0037] Based on the current value at the current moment and the current value at the corresponding historical moment, the stable fluctuation of the current value at the current moment is calculated in real time. The stable fluctuation of the current value at the current moment is described as:

[0038] in, is the current value at the current moment, is the average value of the current values ​​at the K moments before the current moment. In this embodiment, K=4.

[0039] If the stable fluctuation of the current value at the current moment is less than the preset fault threshold (the threshold is also set based on the safety standards of the power system and historical fault data), it is considered that the current fault stable state has been entered. In this embodiment, if the stable fluctuation of the current value at the current moment is less than 10%, it is considered that the current fault stable state has been entered. The current value at this time is the predicted fault current value; the circuit is protected according to the predicted fault current value, such as power off, starting the backup power supply or sending an alarm.

[0040] The working principle of the circuit protection method based on fault current prediction in this embodiment is: See also Figure 3-Figure 6, the current prediction value curve is the current value calculation value, the original data curve is the AC current original data, and the horizontal axis of the coordinate is the time axis (in units of 0.1ms). In the initial process of the current fault, due to the use of the first differential three sampling point method to calculate the current value, there may be some sampling points with current data before the fault, and the other sampling points with data after the fault. At this time, the calculated current value will jump, and it is found that the value change amplitude in the current unstable interval is often relatively large. The present invention uses the characteristic of the large current value change amplitude in the current unstable interval to judge the start of the fault. It can be seen from the figure that in the first 1.3 milliseconds of the figure, the sampling value crosses the value before the fault, so the calculated current value is very unstable and jumps greatly. After 1.3 milliseconds, the current value judgment calculated value tends to be stable. Therefore, the present invention delays the current fault fluctuation time and then calculates the stable fluctuation of the stable current value, so as to avoid the current interval with unstable current value.

[0041] This embodiment uses the first differential three sampling point method to calculate the current value at the current moment This method can sensitively capture the changing trend of current, especially when a fault occurs, the sudden change of current value can be quickly identified; by calculating the current value at the current moment The average value of the calculated current values ​​of the previous K (such as K=4) The measurement accuracy (i.e., deviation rate) P between current and current is calculated. When P is greater than the set threshold (e.g., 12%), it can be determined that a current fault has occurred. This step effectively avoids false alarms caused by instantaneous fluctuations and improves the accuracy of fault detection. A 1.3 millisecond delay step is designed to wait for the current fluctuation to stabilize before performing subsequent calculations. This design not only avoids misjudgments caused by instantaneous current fluctuations, but also ensures that the system can respond quickly when a fault actually occurs. After the delay, by recalculating and ,when When the current is less than the set threshold (such as 10%), it can be judged that the fault current has entered a stable state and the steady-state current at the time of the fault is obtained. This step further improves the timeliness and accuracy of the fault response; When the current amplitude at the current moment is not This is mainly because when the amount of average data is small, adding This design ensures that The accuracy and stability of the proposed method can improve the stability and reliability of the entire system; at the same time, the fault current prediction can be completed within 3ms, with short response time and high accuracy, which can effectively reduce the power outage time and maintenance costs caused by faults and improve the overall operation efficiency of the power system.

[0042] An embodiment of the present invention provides an electronic device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions to implement a circuit protection method flow or corresponding functions based on fault current prediction.

[0043] An embodiment of the present invention provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a terminal device for storing programs and data. It is understandable that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and the extended storage medium supported by the terminal device, and can be any tangible medium containing or storing a program, which can be used by or in combination with an instruction execution system, device or device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that more specific examples of computer-readable storage media herein (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0044] Computer-readable storage media also include data signals propagated in baseband or as part of a carrier wave, which carry readable program code. Such propagated data signals can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable storage medium can also be any readable medium other than a readable storage medium, which can send, propagate or transmit programs for use by or in conjunction with an instruction execution system, device or device. The program code contained on the readable storage medium can be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF (Radio Frequency), etc., or any suitable combination of the above.

[0045] Program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device.

[0046] One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement corresponding steps of the circuit protection method based on fault current prediction in the above-mentioned embodiment. One embodiment of the present invention provides a computer program product, which includes specific computer instructions for instructing a computer to execute the above-mentioned circuit protection method based on fault current prediction, aiming to predict the fault current in the power system, thereby improving the stability and safety of the power system. The computer program product exists in the form of software and can be stored in various storage media, such as hard disks, optical disks, flash memory, etc. When the program is loaded into a computer and run, the circuit protection method based on fault current prediction of the present invention can be executed.

[0047] See also Figure 2 One embodiment of the present invention provides a circuit protection system based on fault current prediction, comprising: The data acquisition module 201 is used to acquire the instantaneous current value at the current moment and the instantaneous current value at the corresponding historical moment in real time; The current value calculation module 202 is used to calculate the current value at the current moment in real time based on the instantaneous current value at the current moment and the instantaneous current value at the historical moment, and simultaneously obtain the current value at the corresponding historical moment; The current value accuracy calculation module 203 is used to calculate the measurement accuracy of the current value at the current moment in real time based on the current value at the current moment and the current value at the corresponding historical moment; The fault establishment judgment module 204 is used to determine that the current fault is established when the current value measurement accuracy at the current moment is greater than the current fault response accuracy, and to stop the calculation of the current value measurement accuracy at the current moment; and to delay the fault current fluctuation time; The fault current steady-state judgment module 205 is used to calculate the stable fluctuation of the current value at the current moment in real time based on the current value at the current moment after the delay and the current value at the corresponding historical moment; when the stable fluctuation of the current value at the current moment is less than the preset value, the current fault stable state is entered; A fault current prediction module 206 is used to obtain a stable current in a stable state of a current fault, and use the stable current in the stable state of the current fault as a predicted fault current value; The circuit protection module 207 is used to protect the circuit based on the predicted fault current value.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A circuit protection method based on fault current prediction, characterized in that: The following steps are involved: Obtain the instantaneous current value at the current moment and the corresponding instantaneous current value at the historical moment in real time; Based on the instantaneous current value at the current moment and the instantaneous current value at the historical moment, the current value at the current moment is calculated in real time, and the current value at the corresponding historical moment is obtained at the same time; Based on the current value at the current moment and the current value at the corresponding historical moment, the measurement accuracy of the current value at the current moment is calculated in real time; When the current value measurement accuracy at the current moment is greater than the current fault response accuracy, the current fault is established, and the calculation of the current value measurement accuracy at the current moment is stopped; And delay the fault current fluctuation time; Based on the delayed current value at the current moment and the current value at the corresponding historical moment, the stable fluctuation of the current value at the current moment is calculated in real time; when the stable fluctuation of the current value at the current moment is less than the preset value, the current fault stable state is entered; Obtaining a stable current in a stable state of a current fault, and using the stable current in the stable state of the current fault as a predicted fault current value; The circuit is protected based on the predicted fault current value.

2. The circuit protection method based on fault current prediction according to claim 1, characterized in that: The real-time calculation of the current value at the current moment adopts a first differential three sampling point method.

3. The circuit protection method based on fault current prediction according to claim 1, characterized in that: The measurement accuracy of the current value at the current moment is described as: in, is the measurement accuracy of the current value at the current moment n; is the current value at the current moment n, is the average current value of the K moments before the current moment n.

4. The circuit protection method based on fault current prediction according to claim 1, characterized in that: The stable fluctuation of the current value at the current moment is described as: in, is the stable fluctuation of the current value at the current moment n; is the current value at the current moment n, is the average current value of the K moments before the current moment n.

5. The circuit protection method based on fault current prediction according to claim 1, characterized in that: The current fault response accuracy is preset according to actual needs and is a critical value for the establishment of a current fault.

6. The circuit protection method based on fault current prediction according to claim 1, characterized in that: The current fault fluctuation time is the time from when the current fault occurs to when the fault current enters a stable state.

7. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the circuit protection method based on fault current prediction as claimed in any one of claims 1 to 6 when executing the computer program.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the circuit protection method based on fault current prediction according to any one of claims 1 to 6 is implemented.

9. A computer program product, comprising computer instructions, characterized in that: The computer instructions instruct the computer to execute the circuit protection method based on fault current prediction as described in any one of claims 1-6.

10. A circuit protection system based on fault current prediction, characterized in that: include: A data acquisition module is used to obtain the instantaneous current value at the current moment and the instantaneous current value at the corresponding historical moment in real time; The current value calculation module is used to calculate the current value at the current moment in real time based on the instantaneous current value at the current moment and the instantaneous current value at the historical moment, and simultaneously obtain the current value at the corresponding historical moment; The current value accuracy calculation module is used to calculate the measurement accuracy of the current value at the current moment in real time based on the current value at the current moment and the current value at the corresponding historical moment; A fault establishment judgment module is used to determine that a current fault is established when the current value measurement accuracy at the current moment is greater than the current fault response accuracy, and to stop the calculation of the current value measurement accuracy at the current moment; And delay the fault current fluctuation time; The fault current steady-state judgment module is used to calculate the stable fluctuation of the current value at the current moment in real time based on the current value at the current moment after delay and the current value at the corresponding historical moment; when the stable fluctuation of the current value at the current moment is less than the preset value, the current fault stable state is entered; A fault current prediction module is used to obtain a stable current in a stable state of a current fault, and use the stable current in the stable state of the current fault as a predicted fault current value; The circuit protection module is used to protect the circuit based on the predicted fault current value.

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