Power distribution network fault identification method, system and equipment based on power distribution terminal, and storage medium

Abstract

The invention relates to a power distribution network fault identification method based on a power distribution terminal, and the method comprises the steps: collecting voltage data and current data in a power distribution line, and transmitting the voltage data and the current data to the power distribution terminal; judging whether a fault point exists in the power distribution network or not; if a fault point exists in the power distribution network, determining a traveling wave head generation moment when a fault occurs according to a change state of a traveling wave signal, determining a distance from the fault point to a measurement point, and obtaining position information of the fault point; determining the fault type of the fault point according to the fault voltage value and the difference between the fault current value and the voltage and current of a normal point; and packaging the position information and the fault type, and sending the position information and the fault type to a monitoring center. According to the method, the fault point position is firstly analyzed, then the fault type is analyzed, the computing power of the processors can be effectively reduced, the two processors can be adopted for fault point position analysis and fault type analysis, the cost is effectively reduced, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent distribution transformer terminals, and specifically provides a method, system, device, and storage medium for identifying distribution network faults based on distribution terminals. Background Technique

[0002] China's power industry is an important pillar of the country's infrastructure and economic development. To ensure the equipment and technology for power grid operation, the existing fault identification methods cannot achieve the accuracy of high-performance chips, and it is necessary to effectively improve the existing fault identification methods. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for identifying distribution network faults based on distribution terminals to solve the problems raised in the above background technique.

[0004] The first aspect of the present invention provides a method for identifying distribution network faults based on distribution terminals, including:

[0005] S1. Collect voltage data and current data in the distribution line, and send the voltage data and the current data to the distribution terminal;

[0006] S2. The distribution terminal processes the voltage data and the current data, and determines whether there is a fault point in the distribution network according to the processing result;

[0007] S3. If there is a fault point in the distribution network, then according to the change state of the traveling wave signal, determine the generation time of the traveling wave head when the fault occurs. Taking the generation time of the traveling wave head as the starting point, according to the transmission speed of the traveling wave signal, determine the distance from the fault point to the measurement point to obtain the position information of the fault point;

[0008] S4. Obtain the fault voltage value and the fault current value near the fault point, and determine the fault type of the fault point according to the difference between the fault voltage value and the fault current value and the voltage and current of the normal point;

[0009] S5. Package the position information and the fault type and send them to the monitoring center.

[0010] In a possible implementation manner, the step S2 includes:

[0011] Mark the voltage data and the current data according to the time when the voltage data and the current data reach the distribution equipment. If the instantaneous voltage or instantaneous current at a certain moment is abnormally greater than or less than the voltage value or current value at the nearby moment, then there is a fault point in the distribution network, and this moment is taken as the generation time of the fault point.

[0012] In a possible implementation manner, step S3 includes:

[0013] Adopt the single - end positioning method or the double - end positioning method to determine the position information of the fault point.

[0014] Among them, the calculation method of the single - end positioning method is as follows:

[0015]

[0016] In the formula: d is the distance from the fault point to the measurement point, t1 is the arrival time of the initial traveling wave, t2 is the arrival time of the reflected traveling wave, and v is the traveling wave propagation speed.

[0017] The calculation method of the double - end positioning method is as follows:

[0018]

[0019] In the formula: x is the distance from the fault point to measurement point A, t A , t B are respectively the times when the traveling wave arrives at point A and point B, L is the total length of the line, and v is the traveling wave propagation speed.

[0020] In a possible implementation manner, step S4 includes:

[0021] If the difference between the fault current value and the current at the normal point is greater than the short - circuit voltage threshold, and the difference between the voltage value at the normal point and the fault voltage value is greater than the short - circuit current threshold, then the fault type of the fault point is a single - phase grounding fault.

[0022] In a possible implementation manner, after the difference between the fault current value and the current at the normal point is greater than the short - circuit voltage threshold, and the difference between the voltage value at the normal point and the fault voltage value is greater than the short - circuit current threshold, it further includes:

[0023] Apply the zero - sequence current method to obtain the zero - sequence current, and the formula is:

[0024]

[0025] In the formula: I0 is the zero - sequence current; I A , I B , I C are respectively the three - phase currents;

[0026] Then apply the zero - sequence voltage method to obtain the zero - sequence voltage, and the formula is:

[0027]

[0028] In the formula: V0 is the zero - sequence voltage; V A , V B , VC They are three-phase voltages respectively;

[0029] If the I0 is greater than a preset current threshold and the V0 is greater than a preset voltage threshold, the fault type of the fault point is a single-phase grounding fault.

[0030] In a possible implementation manner, the step S4 includes: if the difference between the voltage value of the normal point and the fault voltage value is greater than a disconnection voltage threshold, and the difference between the current value of the normal point and the fault current value is greater than a disconnection current threshold, and the duration of the above situation is greater than a delay time, the fault type of the fault point is a disconnection fault, and its judgment formula is:

[0031] Fault point = I_measured < I min and V_measured < V min and t_duration > t_delay

[0033] In the formula, I_measured is the monitored current value, I min is the minimum current value, V measured is the voltage value monitored in real time, V min is the minimum voltage value, t_duration is the duration when the current is less than the set threshold, and t_delay is the delay time.

[0034] The second aspect of the present invention provides a distribution network fault identification system based on a distribution terminal, including:

[0035] A data acquisition module, configured to acquire voltage data and current data in a distribution line and send the voltage data and the current data to the distribution terminal;

[0036] The distribution terminal is configured to analyze and process the voltage data and the current data, identify the fault point, and send the position information of the fault point and the fault type to the monitoring center;

[0037] The monitoring center is configured to reprocess the position information of the fault point and the fault type sent by the distribution terminal to generate an alarm message and send the alarm message to the inspection terminal.

[0038] In a possible implementation manner, the distribution terminal includes:

[0039] A processing unit, configured to determine the generation time of the traveling wave head when a fault occurs according to the change state of the traveling wave signal, and starting from the generation time of the traveling wave head, determine the distance from the fault point to the measurement point according to the transmission speed of the traveling wave signal to obtain the position information of the fault point

[0040] An analysis unit for determining the fault type of the fault point according to the difference between the fault voltage value and the fault current value and the voltage and current at the normal point;

[0041] A storage unit for storing the voltage data and current data collected by the data acquisition module and the fault information during line faults.

[0042] A third aspect of the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the distribution network fault identification method based on a distribution terminal as described in the first aspect of the present invention.

[0043] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, it implements the distribution network fault identification method based on a distribution terminal as described in the first aspect of the present invention.

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] 1. After processing the real-time current and real-time voltage, the fault point location is first determined, and then the fault type is analyzed, which can effectively reduce the computing power of the processor. Two processors can be used to perform the fault point location analysis and the fault type analysis respectively, effectively reducing costs and improving efficiency;

[0046] 2. The algorithm for determining the fault location is effectively optimized. Only the propagation speed of the traveling wave and the time when the traveling wave reaches the test point are required to accurately determine the location of the fault point, saving processing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic flow chart of the distribution network fault identification method based on a distribution terminal of the present invention;

[0048] Figure 2 It is a schematic structural diagram of the distribution network fault identification system based on a distribution terminal of the present invention;

[0049] Figure 3 It is a schematic structural diagram of the distribution terminal of the distribution network fault identification system based on a distribution terminal of the present invention;

[0050] Figure 4 It is a schematic diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0052] It should be noted that the serial numbers assigned to the components in the embodiments of the present invention itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings.

[0053] As Figure 1 shown, the first method of the present invention provides a method for identifying faults in a distribution network based on a distribution terminal, including:

[0054] S1. Collect voltage data and current data in the distribution line and send the voltage data and the current data to the distribution terminal;

[0055] In the present invention, a low-power and low-computing-power Ziguang FPGA can be used for data collection, and then the collected data can be transmitted to the distribution terminal through Ethernet. During the transmission process, data encryption can be performed to ensure data security and reliability. Among them, common encryption algorithms such as MD-5 can be used for data encryption. When collecting current data and voltage data, the time interval for data collection can be determined according to the length of the distribution network and the number of distribution terminals, and then according to this time interval, current data and voltage data are collected simultaneously. The electricity in the distribution network is three-phase alternating current.

[0056] S2. The distribution terminal processes the voltage data and the current data, and judges whether there is a fault point in the distribution network according to the processing result;

[0057] In the present invention, the processor used by the distribution terminal is an Allwinner T3 processor, and a Beidou clock chip is also equipped in the distribution terminal to mark the time when the fault point occurs, and at the same time, a Ziguang data memory is used to store voltage data, current data, and fault information during line faults.

[0058] The following will elaborate on the identification of the fault point:

[0059] First, use the Beidou clock chip to count the time when the voltage data and the current data reach the power distribution equipment, and mark the voltage data and the current data with the time as a mark. Then, use the Allwinner T3 processor to analyze the voltage values and current values at each moment. If the instantaneous voltage or instantaneous current at a certain moment is abnormally greater than or less than the voltage value or current value at the nearby moment, there is a fault point in the distribution network, and this moment is the generation moment of the fault point. That is, the voltage value or current value of the fault point will be significantly different from the voltage value or current value at the surrounding moments. For example, if the voltage at a certain point is 500V and the voltage values at the surrounding moments are 220V, then this point is a fault point. The difference method or other methods can be used to identify the points where the voltage or current values are significantly different from the surrounding points, and these points are the fault points.

[0060] S3. If there is a fault point in the distribution network, determine the generation moment of the traveling wave head when the fault occurs according to the change state of the traveling wave signal. Taking the generation moment of the traveling wave head as the starting point, and according to the transmission speed of the traveling wave signal, determine the distance from the fault point to the measurement point to obtain the position information of the fault point;

[0061] Specifically, when determining the position information of the fault point, the single - end positioning method or the double - end positioning method can be used.

[0062] Among them, the calculation method of the single - end positioning method is as follows:

[0063]

[0064] In the formula: d is the distance from the fault point to the measurement point, t1 is the arrival time of the initial traveling wave, t2 is the arrival time of the reflected traveling wave, and v is the traveling wave propagation speed;

[0065] The calculation method of the double - end positioning method is as follows:

[0066]

[0067] In the formula: x is the distance from the fault point to the measurement point A, t A ,t B are the times when the traveling wave reaches point A and point B respectively, L is the total length of the line, and v is the traveling wave propagation speed.

[0068] When using the above method to determine the arrival time of the traveling wave, it is necessary to first determine the starting point (wave head) of the traveling wave, that is, the moment when the wave head reaches the measurement point (point A, point B) is the arrival time. The wave head can be determined in the following way:

[0069] 1. Threshold - based method: This method identifies the starting point of the traveling wave signal by setting a threshold. When the signal strength exceeds the preset threshold, it is considered as the starting point of the fault traveling wave.

[0070] For a simple threshold method, a signal amplitude threshold T is usually set, and when the signal amplitude exceeds this threshold, it is considered the starting point of the traveling wave. Let x(t) be the amplitude of the signal, and the formula for the threshold method is as follows:

[0071] If |x(t)| > T, then t start = t

[0072] where, t start is the starting time of the fault traveling wave, T is the threshold, and t is the current time.

[0073] 2. Based on wavelet transform: By analyzing the detail coefficients of the wavelet transform, at the mutation point of the signal (i.e., the fault starting point), the transform coefficients usually change violently. The wavelet transform can effectively analyze signals in different frequency bands and is especially suitable for non-stationary signals. By performing multi-scale analysis on the signal, the starting point of the signal can be located.

[0074] The formula for the wavelet transform is:

[0075]

[0076] where: W x (a, b) is the wavelet transform coefficient of the signal x(t) at scale a and position b.

[0077] ψ is the mother wavelet, and Morlet wavelet, Haar wavelet, etc. are usually selected.

[0078] a is the scale factor, which controls the width of the wavelet, and b is the position factor, which controls the translation of the wavelet.

[0079] W x (a, b) is greater than the transform threshold at a certain moment compared with the surrounding moments, then the point corresponding to this moment is the fault point.

[0080] 3. Method based on instantaneous frequency analysis: Using methods such as Hilbert Transform or Short-Time Fourier Transform (STFT), calculate the instantaneous frequency, and determine the starting point of the fault traveling wave through the points where the frequency mutates. The instantaneous frequency can reflect the change characteristics of the signal. Especially near the starting point of the traveling wave signal, the instantaneous frequency usually changes violently. By analyzing the instantaneous frequency of the signal, the wavefront can be located more accurately.

[0081] The calculation formula of the Hilbert transform first assumes that the complex envelope of the signal x(t) is:

[0082] z(t) = x(t) + jH{x(t)}

[0083] where, H{x(t)} is the Hilbert transform of the signal x(t), defined as:

[0084]

[0085] Here, P represents the principal value integral.

[0086] Then, the instantaneous frequency f(t) can be obtained from the rate of change of the phase angle of the complex envelope z(t).

[0087]

[0088] At the starting point of the fault traveling wave, the instantaneous frequency usually changes suddenly.

[0089] S4. Obtain the fault voltage value and fault current value near the fault point, and determine the fault type of the fault point according to the differences between the fault voltage value and fault current value and the voltage and current at the normal point.

[0090] When analyzing the fault type of the fault point, it can be carried out in the following way:

[0091] If the difference between the fault current value and the current at the normal point is greater than the short-circuit voltage threshold, and the difference between the voltage value at the normal point and the fault voltage value is greater than the short-circuit current threshold, then the fault type of the fault point is a single-phase grounding fault.

[0092] Among them, when determining that the fault type is a single-phase grounding fault, it can be carried out in the following way:

[0093] 1. Apply the zero-sequence current method to obtain the zero-sequence current, and the formula is:

[0094]

[0095] In the formula: I0 is the zero-sequence current; I A , I B , I C are the three-phase currents respectively;

[0096] 2. Then apply the zero-sequence voltage method to obtain the zero-sequence voltage, and the formula is:

[0097]

[0098] In the formula: V0 is the zero-sequence voltage; V A , V B , V C are the three-phase voltages respectively;

[0099] If the I0 is greater than the preset current threshold and the V0 is greater than the preset voltage threshold, then the fault type of the fault point is a single-phase grounding fault.

[0100] Alternatively, the fault type can also be determined as a single-phase grounding fault by monitoring the negative-sequence current. The specific formula is as follows:

[0101]

[0102] Where: I2 is the negative-sequence current; I A ,I B ,I C are the three-phase currents respectively.

[0103] When the negative-sequence current I2 exceeds the preset negative-sequence threshold, it is determined as a single-phase grounding fault.

[0104] If the fault type at the fault point is an open-circuit fault, its judgment formula is:

[0105] Fault point = I_measured < I min and V_measured < V min and t_duration > t_delay

[0107] In the formula, I_measured is the measured current value, I min is the minimum current value, V measured is the voltage value monitored in real time, V min is the minimum voltage value, t_duration is the duration when the current is less than the set threshold, and t_delay is the delay time.

[0108] In practical applications, the propagation speed of traveling waves is usually close to the speed of light, but due to the existence of inductance and capacitance, its speed will be less than the speed of light in a vacuum, that is:

[0109] c ≈ 3×10 8 m / s

[0110] The value of the traveling wave speed is usually between 90% and 99% of the speed of light. The specific value depends on the parameters of the line. For example, for an overhead line in the air: it is about 0.95 times the speed of light. For an underground cable line: the speed will be slightly lower, usually between 0.7 and 0.9 times the speed of light.

[0111] S5. Package the location information and the fault type and send them to the monitoring center.

[0112] As Figure 2 shown, the second aspect of the present invention provides a distribution network fault identification system based on a distribution terminal, including:

[0113] A data acquisition module 10 for acquiring voltage data and current data in the distribution line and sending the voltage data and the current data to the distribution terminal;

[0114] The power distribution terminal 20 is used to analyze and process the voltage data and the current data, identify the fault point, and send the location information of the fault point and the fault type to the monitoring center;

[0115] The monitoring center 30 is used to reprocess the location information of the fault point and the fault type sent by the power distribution terminal to generate an alarm message, and send the alarm message to the inspection terminal.

[0116] Among them, the power distribution terminal 20, as Figure 3 shown, includes:

[0117] The processing unit 21 is used to determine the generation time of the traveling wave head when a fault occurs according to the change state of the traveling wave signal, and starting from the generation time of the traveling wave head, determine the distance from the fault point to the measurement point according to the transmission speed of the traveling wave signal, so as to obtain the location information of the fault point

[0118] The analysis unit 22 is used to determine the fault type of the fault point according to the difference between the fault voltage value and the fault current value and the voltage and current of the normal point;

[0119] The storage unit 23 is used to store the voltage data and current data collected by the data acquisition module and the fault information during line faults.

[0120] In one embodiment, as Figure 4 shown, a computer device 40 is provided, including a memory 42, a processor 41, and a computer program 43 stored in the memory 42 and executable on the processor 41. When the processor 41 executes the computer program 43, the steps in the data processing method of the above embodiment are implemented. To avoid repetition, it will not be elaborated here. Alternatively, when the processor 41 executes the computer program 43, the functions of each module in the above embodiment of the power distribution network fault identification system based on the power distribution terminal are implemented. To avoid repetition, it will not be elaborated here.

[0121] In one embodiment, a readable storage medium is provided. The readable storage medium stores a computer program 43. When the computer program 43 is executed by the processor 41, the steps in the data processing method of the above embodiment are implemented. To avoid repetition, it will not be elaborated here. Alternatively, when the processor 41 executes the computer program 43, the functions of each module in the above embodiment of the data processing device are implemented. To avoid repetition, it will not be elaborated here.

[0122] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided by the present invention can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM

[0123] (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or an external cache. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (SynchlinK) DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0124] Those skilled in the art can clearly understand that for the convenience and brevity of description, the above examples are given by dividing the above functional units and modules. In actual applications, the above functions can be allocated to different functional modules, sub-modules, and units according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A distribution network fault identification method based on distribution terminal, characterized in that: include: S1. Collecting voltage data and current data in a distribution line, and sending the voltage data and current data to a distribution terminal; S2. The power distribution terminal processes the voltage data and the current data, and determines whether there is a fault point in the distribution network according to the processing result; S3. If there is a fault point in the distribution network, determine the time when the traveling wave head is generated when the fault occurs according to the change state of the traveling wave signal, take the time when the traveling wave head is generated as the starting point, determine the distance from the fault point to the measurement point according to the transmission speed of the traveling wave signal, and obtain the location information of the fault point; S4, obtaining a fault voltage value and a fault current value near the fault point, and determining the fault type of the fault point according to the difference between the fault voltage value and the fault current value and the voltage and current of a normal point; S5. Pack the location information and the fault type, and send them to a monitoring center.

2. The method for identifying distribution network faults based on distribution terminals according to claim 1, characterized in that: The step S2 comprises: The voltage data and the current data are marked according to the time when the voltage data and the current data arrive at the distribution equipment. If the instantaneous voltage or instantaneous current at a certain moment is abnormally greater than or less than the voltage value or current value at a nearby moment, there is a fault point in the distribution network, and this moment is regarded as the time when the fault point is generated.

3. The method for identifying distribution network faults based on distribution terminals according to claim 1, characterized in that: The step S3 comprises: Using a single-end positioning method or a dual-end positioning method to determine the location information of the fault point, Among them, the calculation method of the single-end positioning method is as follows: Where: d is the distance from the fault point to the measurement point, t1 is the arrival time of the initial traveling wave, t2 is the arrival time of the reflected traveling wave, and v is the propagation speed of the traveling wave; The calculation method of the double-end positioning method is as follows: Where: x is the distance from the fault point to the measuring point A, t A ,t B are the time it takes for the traveling wave to reach point A and point B, L is the total length of the line, and v is the propagation speed of the traveling wave.

4. The method for identifying distribution network faults based on distribution terminals according to claim 1, characterized in that: The step S4 comprises: If the difference between the fault current value and the current of the normal point is greater than the short-circuit voltage threshold, and the difference between the voltage value of the normal point and the fault voltage value is greater than the short-circuit current threshold, the fault type of the fault point is a single-phase grounding fault.

5. The method for identifying distribution network faults based on distribution terminals according to claim 4, characterized in that: If the difference between the fault current value and the current at the normal point is greater than the short-circuit voltage threshold, and the difference between the voltage value at the normal point and the fault voltage value is greater than the short-circuit current threshold, the method further includes: The zero-sequence current method is used to obtain the zero-sequence current. The formula is: Where: I0 is the zero-sequence current; I A ,I B ,I C They are three-phase currents; Then apply the zero-sequence voltage method to obtain the zero-sequence voltage, the formula is: Where: V0 is the zero-sequence voltage; V A ,V B ,V C They are three-phase voltages respectively; If I0 is greater than a preset current threshold, and V0 is greater than a preset voltage threshold, then the fault type of the fault point is a single-phase grounding fault.

6. The method for identifying distribution network faults based on distribution terminals according to claim 1, characterized in that: The step S4 comprises: If the difference between the voltage value of the normal point and the fault voltage value is greater than the line-break voltage threshold, and the difference between the current value of the normal point and the fault current value is greater than the line-break current threshold, and the duration of the above situation is greater than the delay time, then the fault type of the fault point is a line-break fault, and the judgment formula is: Fault point = I_measured min And V_measured <V min And t_duration>t_delay​ Where, I_measured is the monitored current value, I min is the minimum current value, V measured is the voltage value monitored in real time, V min is the minimum voltage value, t_duration is the duration that the current is less than the set threshold, and t_delay is the delay time.

7. A distribution network fault identification system based on distribution terminals, characterized in that: include: A data acquisition module, used to collect voltage data and current data in the power distribution line, and send the voltage data and the current data to the power distribution terminal; A power distribution terminal is used to analyze and process the voltage data and the current data, identify the fault point, and send the location information of the fault point and the fault type to a monitoring center; The monitoring center is used to reprocess the location information of the fault point and the fault type sent by the distribution terminal to generate alarm information, and send the alarm information to the inspection terminal.

8. The distribution network fault identification system based on distribution terminal according to claim 7, characterized in that: The power distribution terminal comprises: A processing unit is used to determine the time when the traveling wave head is generated when a fault occurs according to the change state of the traveling wave signal, and to determine the distance from the fault point to the measurement point according to the transmission speed of the traveling wave signal with the time when the traveling wave head is generated as the starting point, so as to obtain the position information of the fault point. An analysis unit, configured to determine a fault type of the fault point according to a difference between the fault voltage value and the fault current value and a voltage and current of a normal point; The storage unit is used to store the voltage data and current data collected by the data collection module and the fault information when the line fails.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the distribution network fault identification method based on the distribution terminal as described in any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for identifying distribution network faults based on a distribution terminal as described in any one of claims 1 to 6 is implemented.

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