AC power grounding fault monitoring method and fire early warning system

Abstract

The present invention provides an AC power ground fault monitoring method and a fire warning system, which are applied to the field of fault monitoring technology, and include: obtaining line recording data corresponding to a target AC power supply, the line recording data including three-phase current data, three-phase voltage data, zero-sequence current data, and zero-sequence voltage data; performing cluster analysis on the line recording data to obtain cluster analysis results; judging whether there is a ground fault in the target AC power supply and the corresponding ground fault type when there is a ground fault in the target AC power supply according to the cluster analysis results. The AC power ground fault monitoring method and fire warning system provided by the present invention are different from the means of manual analysis in the prior art, and can realize rapid monitoring of AC power ground faults, save labor costs, and thus improve the efficiency of subsequent fire warnings.

Description

Technical Field

[0001] The present invention belongs to the technical field of fault monitoring, and more specifically, relates to an AC power grounding fault monitoring method and a fire early warning system. Background Art

[0002] Ground faults are common faults in the operation of power systems. Therefore, when a ground fault occurs in a line, it is necessary to find the faulty line as soon as possible and take corresponding measures to avoid causing greater losses. In the AC power supply scenario, the ground fault in the power supply line and the type of ground fault in the power supply line can be obtained by analyzing the line recording data. However, in the prior art, most of the line recording data is analyzed manually based on experience, and the amount of analysis is large, which makes this method extremely labor-intensive, and the monitoring efficiency of ground faults is also low, which in turn leads to the low efficiency of subsequent fire warnings. Summary of the invention

[0003] The purpose of the present invention is to provide an AC power grounding fault monitoring method and a fire warning system to improve the monitoring speed of AC power grounding faults, save labor costs, and improve the efficiency of subsequent fire warnings.

[0004] A first aspect of an embodiment of the present invention provides a method for monitoring an AC power ground fault, comprising:

[0005] Acquire line waveform data corresponding to the target AC power supply, wherein the line waveform data includes three-phase current data, three-phase voltage data, zero-sequence current data, and zero-sequence voltage data;

[0006] Performing cluster analysis on the line recording data to obtain cluster analysis results;

[0007] It is determined according to the cluster analysis result whether the target AC power source has a ground fault and the corresponding ground fault type when the target AC power source has a ground fault.

[0008] In a possible implementation, performing cluster analysis on the line recording data to obtain a cluster analysis result includes:

[0009] The Euclidean distance between the line recording data and the cluster centers of the preset data classes is calculated, and a distance set consisting of the Euclidean distances between the line recording data and the cluster centers of the preset data classes is used as a cluster analysis result; wherein the data classes include a data class without grounding faults and a data class of grounding faults of different fault types.

[0010] In a possible implementation, judging, according to the cluster analysis result, whether the target AC power source has a ground fault and a corresponding fault type when the target AC power source has a ground fault, includes:

[0011] If the cluster analysis result shows that the Euclidean distance between the cluster center of the line recording data and the cluster center of the no-grounding fault data class is the smallest, it is determined that the target AC power supply does not have a grounding fault;

[0012] If the cluster analysis result shows that the Euclidean distance between the cluster center of the line recording data and the ground fault data class is the smallest, it is determined that a ground fault exists in the target AC power supply, and the ground fault type of the data class corresponding to the minimum Euclidean distance in the distance set is used as the ground fault type of the target AC power supply.

[0013] In a possible implementation, after determining the ground fault type of the target AC power supply, the AC power supply ground fault monitoring method further includes:

[0014] Recording the determined ground fault type of the target AC power source as the target ground fault type;

[0015] Inputting the line recording data into a ground fault detection model corresponding to the target ground fault type; the ground fault detection model corresponding to the target ground fault type is obtained by training the data class corresponding to the target ground fault type;

[0016] If the ground fault detection model corresponding to the target ground fault type still shows that the target AC power source has a ground fault of the target ground fault type, then finally determining that the ground fault type of the target AC power source is the target ground fault type;

[0017] If the ground fault detection model corresponding to the target ground fault type shows that the target AC power source does not have a ground fault of the target ground fault type, then the Euclidean distance corresponding to the target ground fault type is deleted from the distance set, and the process returns to the preliminary step of determining the ground fault type;

[0018] The preliminary determination step of the ground fault type refers to:

[0019] The grounding fault type of the data class corresponding to the minimum Euclidean distance in the distance set is used as the grounding fault type of the target AC power supply.

[0020] A second aspect of an embodiment of the present invention provides a monitoring terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned AC power grounding fault monitoring method when executing the computer program.

[0021] A third aspect of an embodiment of the present invention provides a fire warning system, including:

[0022] Data acquisition device, wireless communication device and monitoring terminal described above;

[0023] The data acquisition device is used to collect the line recording data of each AC power supply in the distribution network, and send the line recording data of each AC power supply to the monitoring terminal through the wireless communication device to perform ground fault monitoring of each AC power supply;

[0024] The data acquisition device is also used to collect temperature data of each preset monitoring point in the distribution network, and send the temperature data to the monitoring terminal through the wireless communication device;

[0025] The monitoring terminal is also used to provide a fire warning for the distribution network according to the ground fault monitoring result and the temperature data.

[0026] In a possible implementation, the data acquisition device includes a temperature sensor and an infrared camera processing device;

[0027] The temperature sensor is used to directly collect temperature data of a preset monitoring point in the distribution network, and send the directly collected temperature data to a monitoring terminal via a wireless communication device;

[0028] The infrared camera processing device is used to collect infrared images of preset monitoring points, analyze temperature data of the preset monitoring points according to the infrared images of the preset monitoring points, and send the analyzed temperature data of the preset monitoring points to the monitoring terminal through the wireless communication device.

[0029] In a possible implementation, the fire warning system further includes a warning device; the monitoring terminal implements fire warning of the distribution network by controlling the warning device to emit sound and light signals.

[0030] In a possible implementation, the monitoring terminal is specifically used for:

[0031] According to the ground fault monitoring results of each AC power source, the AC power source with a ground fault is screened out;

[0032] Filtering out temperature data of a preset monitoring point corresponding to the AC power source having a ground fault from the received temperature data;

[0033] Determining whether a fire warning is required based on temperature data of a preset monitoring point corresponding to the AC power source with a ground fault;

[0034] Alternatively, it is determined whether a fire warning is required based directly on the received temperature data.

[0035] According to a fourth aspect of an embodiment of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned AC power grounding fault monitoring method are implemented.

[0036] The AC power grounding fault monitoring method and fire warning system provided by the embodiments of the present invention have the following beneficial effects:

[0037] Different from the manual analysis method in the prior art, the present invention can automatically obtain the line recording data of the AC power supply and realize automated analysis based on the cluster analysis method. This method can greatly improve the monitoring efficiency of the AC power supply grounding fault, and can also effectively save labor costs and improve the efficiency of subsequent fire warnings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0039] Figure 1 A schematic diagram of a flow chart of a method for monitoring an AC power ground fault provided by an embodiment of the present invention;

[0040] Figure 2 A schematic block diagram of a monitoring terminal provided by an embodiment of the present invention;

[0041] Figure 3 A schematic block diagram of a fire warning system provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0042] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0044] Please refer to Figure 1 , Figure 1 A flow chart of a method for monitoring an AC power ground fault provided by an embodiment of the present invention includes:

[0045] S101: Acquire line waveform data corresponding to a target AC power source, where the line waveform data includes three-phase current data, three-phase voltage data, zero-sequence current data, and zero-sequence voltage data.

[0046] In this embodiment, the three-phase current data may include the three-phase current waveform of the power supply line where the target AC power supply is located, and the three-phase current waveform of the bus where the target AC power supply is located. The three-phase voltage data may include the three-phase voltage waveform of the power supply line where the target AC power supply is located, and the three-phase voltage waveform of the bus where the target AC power supply is located. The zero-sequence current data may be the zero-sequence current waveform of the power supply line where the target AC power supply is located, and the zero-sequence voltage data may be the zero-sequence voltage waveform of the power supply line where the target AC power supply is located.

[0047] S102: Perform cluster analysis on the line recording data to obtain cluster analysis results.

[0048] In a possible implementation of this embodiment, cluster analysis is performed on the line recording data to obtain a cluster analysis result, which can be described in detail as follows:

[0049] The Euclidean distance between the line recording data and the cluster centers of each preset data class is calculated, and the distance set consisting of the Euclidean distance between the line recording data and the cluster centers of each preset data class is used as the cluster analysis result. Among them, each data class includes a no grounding fault data class and a grounding fault data class of different fault types.

[0050] The no-grounding fault data class is a data class consisting of historical line recording data without grounding faults. The grounding fault data class with different fault types is a data class consisting of historical line recording data with grounding faults. Each grounding fault data class corresponds to a different grounding fault type.

[0051] In a possible implementation, each data class is obtained by clustering and dividing the historical line recording data using a K-MEANS clustering method or a DBSCAN clustering method.

[0052] S103: judging whether the target AC power source has a ground fault and the corresponding ground fault type when the target AC power source has a ground fault according to the cluster analysis result.

[0053] In this embodiment, whether the target AC power source has a ground fault can be determined based on the cluster analysis result, and when it is determined that the target AC power source has a ground fault, the ground fault type corresponding to the target AC power source is further analyzed based on the clustering result.

[0054] From the above, it can be concluded that, different from the manual analysis method in the prior art, the embodiment of the present invention can automatically obtain the line recording data of the AC power supply, and realize automated analysis based on the cluster analysis method. This method can greatly improve the monitoring efficiency of the AC power grounding fault, and can also effectively save labor costs and improve the efficiency of subsequent fire warnings.

[0055] In a possible implementation, judging whether a target AC power source has a ground fault and a corresponding fault type when the target AC power source has a ground fault according to the cluster analysis result includes:

[0056] If the cluster analysis result shows that the Euclidean distance between the cluster center of the line recording data and the cluster center of the no-grounding fault data class is the smallest, it is determined that the target AC power supply does not have a grounding fault.

[0057] If the cluster analysis result shows that the Euclidean distance between the cluster center of the line recording data and the ground fault data class is the smallest, it is determined that the target AC power supply has a ground fault, and the ground fault type of the data class corresponding to the minimum Euclidean distance in the distance set is used as the ground fault type of the target AC power supply.

[0058] In this embodiment, the data class with the smallest Euclidean distance to the line recording data can be recorded as the target data class. If the target data class is a no-grounding fault data class, it indicates that the target AC power source does not have a grounding fault. If the target data class is a grounding fault data class, it indicates that the target AC power source has a grounding fault, and the grounding fault type of the target data class is used as the grounding fault type of the target AC power source.

[0059] In a possible implementation, after determining the ground fault type of the target AC power supply, the AC power supply ground fault monitoring method further includes:

[0060] The determined ground fault type of the target AC power source is recorded as the target ground fault type.

[0061] The line recording data is input into a ground fault detection model corresponding to the target ground fault type. The ground fault detection model corresponding to the target ground fault type is obtained by training the data class corresponding to the target ground fault type.

[0062] If the ground fault detection model corresponding to the target ground fault type still shows that the target AC power source has a ground fault of the target ground fault type, it is finally determined that the ground fault type of the target AC power source is the target ground fault type.

[0063] In this embodiment, in order to further ensure the accuracy of ground fault monitoring, after the ground fault type of the target AC power supply is preliminarily determined, the ground fault type can also be verified using the ground fault detection model corresponding to the ground fault type. As in the above scheme, the line recording data is input into the ground fault detection model corresponding to the target ground fault type. If the ground fault detection model corresponding to the target ground fault type still shows that the target AC power supply has a ground fault of the target ground fault type, then the ground fault type of the target AC power supply is finally determined to be the target ground fault type.

[0064] In this embodiment, the ground fault detection model corresponding to the target ground fault type is pre-trained by the data class corresponding to the target ground fault type (the historical line recording data in ).

[0065] In a possible implementation, the AC power ground fault monitoring method further includes:

[0066] If the ground fault detection model corresponding to the target ground fault type shows that the target AC power supply does not have a ground fault of the target ground fault type, the Euclidean distance corresponding to the target ground fault type is deleted from the distance set, and the initial determination step of the ground fault type is returned to execute.

[0067] Among them, the initial steps for determining the type of ground fault refer to:

[0068] The grounding fault type of the data class corresponding to the minimum Euclidean distance in the distance set is used as the grounding fault type of the target AC power supply.

[0069] In this embodiment, if it is found during further verification that the ground fault type of the target AC power source does not match the target ground fault type after detection by the ground fault detection model, it indicates that the result of the cluster analysis is not accurate enough, and the Euclidean distance corresponding to the target ground fault type (it is known that the target ground fault type corresponds to a certain data class, and the Euclidean distance corresponding to the target ground fault type is the Euclidean distance between the data class and the line recording data) is deleted from the distance set, and the step of initially determining the ground fault type is returned. In other words, if the ground fault type of the data class with the smallest Euclidean distance to the line recording data does not meet the conditions, the ground fault type of the data class with the second smallest Euclidean distance to the line recording data will be further selected for verification until the ground fault type of the target AC power source is finally determined.

[0070] The application of the solution of this embodiment can effectively improve the accuracy of ground fault monitoring.

[0071] In a possible implementation, the above-mentioned ground fault types include but are not limited to:

[0072] Single-phase grounding fault, two-phase short-circuit grounding fault, three-phase short-circuit grounding fault, etc.

[0073] The second aspect of the present invention can be found in Figure 2 , Figure 2 FIG. 1 is a schematic block diagram of a monitoring terminal provided by an embodiment of the present invention. Figure 2 The terminal 200 in the embodiment shown may include: one or more processors 201, one or more input devices 202, one or more output devices 203 and one or more memories 204. The processors 201, input devices 202, output devices 203 and memories 204 communicate with each other via a communication bus 205. The memory 204 is used to store computer programs, which include program instructions. The processor 201 is used to execute the program instructions stored in the memory 204. The processor 201 is configured to call the program instructions to execute the steps in the above-mentioned method embodiments, for example Figure 1 Steps S101-S103 are shown.

[0074] It should be understood that in the embodiment of the present invention, the processor 201 may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0075] The input device 202 may include a touch panel, a fingerprint sensor (for collecting the user's fingerprint information and fingerprint direction information), a microphone, etc., and the output device 203 may include a display (LCD, etc.), a speaker, etc.

[0076] The memory 204 may include a read-only memory and a random access memory, and provides instructions and data to the processor 201. A portion of the memory 204 may also include a non-volatile random access memory. For example, the memory 204 may also store information about the device type.

[0077] In a specific implementation, the processor 201, input device 202, and output device 203 described in the embodiment of the present invention can execute the implementation methods described in the first and second embodiments of the AC power grounding fault monitoring method provided in the embodiment of the present invention, and can also execute the implementation methods of the terminal described in the embodiment of the present invention, which will not be repeated here.

[0078] For the third aspect of the embodiment of the present invention, please refer to Figure 3 , provides a fire warning system, comprising:

[0079] The data collection device 31, the wireless communication device 32 and the monitoring terminal 200 described above.

[0080] The data acquisition device 31 is used to collect line recording data of each AC power source in the distribution network, and send the line recording data of each AC power source to the monitoring terminal 200 through the wireless communication device 32 to perform ground fault monitoring of each AC power source.

[0081] The data acquisition device 31 is also used to collect temperature data of each preset monitoring point in the power distribution network, and send the temperature data to the monitoring terminal 200 through the wireless communication device 32.

[0082] The monitoring terminal 200 is also used to provide fire warning for the distribution network based on the ground fault monitoring results and temperature data.

[0083] In this embodiment, the wireless communication device 32 may be a 4G module, a 5G module, a NB-IOT module, etc. The data acquisition device 31 may include a device corresponding to temperature data acquisition and a line recording device 310 .

[0084] In this embodiment, the data acquisition device 31 can collect the data required for the fire warning, and send the data required for the fire warning to the monitoring terminal 200 through the wireless communication device 32, so that the monitoring terminal 200 can realize automatic monitoring. Based on this solution, the present invention can effectively save labor costs, improve the monitoring efficiency of fire warning, and effectively ensure the safe operation of the distribution network.

[0085] In a possible implementation, the device corresponding to temperature data acquisition in the data acquisition device 31 includes a temperature sensor 311 and an infrared camera processing device 312 .

[0086] The temperature sensor 311 is used to directly collect temperature data of a preset monitoring point in the power distribution network, and send the directly collected temperature data to the monitoring terminal 200 via the wireless communication device 32 .

[0087] The infrared camera processing device 312 is used to collect infrared images of preset monitoring points, analyze temperature data of the preset monitoring points according to the infrared images of the preset monitoring points, and send the analyzed temperature data of the preset monitoring points to the monitoring terminal 200 through the wireless communication device 32.

[0088] In this embodiment, for the preset monitoring points where it is convenient to install the temperature sensor 311, the temperature can be directly monitored based on the temperature sensor 311, and for the preset monitoring points where it is not convenient to install the temperature sensor 311, the temperature can be monitored based on the infrared camera processing device 312. Based on this, the fire warning system provided by the embodiment of the present invention can adapt to more installation scenarios and has a wider range of applications.

[0089] In a possible implementation, the fire warning system further includes a warning device 33. The monitoring terminal 200 controls the warning device 33 to emit sound and light signals to implement fire warning of the distribution network.

[0090] In this embodiment, the warning device 33 may include a buzzer or an indicator light, which realizes sound and light alarm by receiving a control signal from the monitoring terminal 200 .

[0091] In a possible implementation, the monitoring terminal 200 is specifically used for:

[0092] According to the ground fault monitoring results of each AC power source, the AC power source with a ground fault is screened out.

[0093] The temperature data of a preset monitoring point corresponding to the AC power source having a ground fault is screened out from the received temperature data.

[0094] Whether a fire warning is required is determined based on the temperature data of the preset monitoring point corresponding to the AC power supply with a ground fault.

[0095] Alternatively, it is determined whether a fire warning is required based directly on the received temperature data.

[0096] In this embodiment, the temperature data of the line with the ground fault can be screened first to quickly find the fire hazard and improve the efficiency of the fire warning. It can also be directly determined based on the temperature data whether a fire warning is needed.

[0097] In this embodiment, judging whether a fire warning is required based on the received temperature data can be described in detail as follows:

[0098] If the temperature of a certain monitoring point is greater than a preset temperature value and the duration of the temperature of the monitoring point being greater than the preset temperature value exceeds a preset time, it is determined that a fire warning is required; or, if the temperature rise rate of a certain monitoring point is greater than a preset rise rate, it is determined that a fire warning is required. In other cases, it is determined that no fire warning is required. Based on the solution provided by the embodiment of the present invention, rapid discovery of fires can be achieved and damage can be stopped in time.

[0099] The fourth aspect of the present invention also provides a computer-readable storage medium, which stores a computer program, which includes program instructions. When the program instructions are executed by the processor, all or part of the process in the above-mentioned embodiment method is implemented, and the computer program can also be completed by instructing the relevant hardware through the computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, the steps of each method embodiment can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0100] The computer-readable storage medium may be an internal storage unit of the terminal of any of the foregoing embodiments, such as a hard disk or memory of the terminal. The computer-readable storage medium may also be an external storage device of the terminal, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the terminal. Further, the computer-readable storage medium may also include both an internal storage unit of the terminal and an external storage device. The computer-readable storage medium is used to store computer programs and other programs and data required by the terminal. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

[0101] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0102] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the terminals and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0103] In the several embodiments provided in the present application, it should be understood that the disclosed terminals and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces or units, or it can be an electrical, mechanical or other form of connection.

[0104] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0105] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0106] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for monitoring an AC power ground fault, characterized in that: include: Acquire line waveform data corresponding to the target AC power supply, wherein the line waveform data includes three-phase current data, three-phase voltage data, zero-sequence current data, and zero-sequence voltage data; Performing cluster analysis on the line recording data to obtain cluster analysis results; Determine, according to the cluster analysis result, whether the target AC power source has a ground fault and the corresponding ground fault type when the target AC power source has a ground fault; The cluster analysis is performed on the line recording data to obtain the cluster analysis result, including: Calculating the Euclidean distance between the line recording data and the cluster centers of each preset data class, and taking the distance set consisting of the Euclidean distance between the line recording data and the cluster centers of each preset data class as the cluster analysis result; wherein each data class includes a no-grounding fault data class and a grounding fault data class of different fault types; The determining, according to the cluster analysis result, whether the target AC power source has a ground fault and a corresponding fault type when the target AC power source has a ground fault includes: If the cluster analysis result shows that the Euclidean distance between the cluster center of the line recording data and the cluster center of the no-grounding fault data class is the smallest, it is determined that the target AC power supply does not have a grounding fault; If the cluster analysis result shows that the Euclidean distance between the cluster center of the line recording data and the ground fault data class is the smallest, it is determined that a ground fault exists in the target AC power supply, and the ground fault type of the data class corresponding to the minimum Euclidean distance in the distance set is used as the ground fault type of the target AC power supply; After determining the ground fault type of the target AC power supply, the AC power supply ground fault monitoring method further includes: Recording the determined ground fault type of the target AC power source as the target ground fault type; Inputting the line recording data into a ground fault detection model corresponding to the target ground fault type; the ground fault detection model corresponding to the target ground fault type is obtained by training the data class corresponding to the target ground fault type; If the ground fault detection model corresponding to the target ground fault type still shows that the target AC power source has a ground fault of the target ground fault type, then finally determining that the ground fault type of the target AC power source is the target ground fault type; If the ground fault detection model corresponding to the target ground fault type shows that the target AC power source does not have a ground fault of the target ground fault type, the Euclidean distance corresponding to the target ground fault type is deleted from the distance set, and the process returns to the preliminary step of determining the ground fault type; The preliminary determination step of the ground fault type refers to: The grounding fault type of the data class corresponding to the minimum Euclidean distance in the distance set is used as the grounding fault type of the target AC power supply.

2. A monitoring terminal, 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 steps of the method according to claim 1 are implemented.

3. A fire warning system, characterized in that: include: A data acquisition device, a wireless communication device, and a monitoring terminal as claimed in claim 2; The data acquisition device is used to collect the line recording data of each AC power supply in the distribution network, and send the line recording data of each AC power supply to the monitoring terminal through the wireless communication device to perform ground fault monitoring of each AC power supply; The data acquisition device is also used to collect temperature data of each preset monitoring point in the distribution network, and send the temperature data to the monitoring terminal through the wireless communication device; The monitoring terminal is also used to provide a fire warning for the distribution network according to the ground fault monitoring result and the temperature data.

4. The fire warning system according to claim 3, characterized in that: The data acquisition device includes a temperature sensor and an infrared camera processing device; The temperature sensor is used to directly collect temperature data of a preset monitoring point in the distribution network, and send the directly collected temperature data to a monitoring terminal via a wireless communication device; The infrared camera processing device is used to collect infrared images of preset monitoring points, analyze temperature data of the preset monitoring points according to the infrared images of the preset monitoring points, and send the analyzed temperature data of the preset monitoring points to the monitoring terminal through the wireless communication device.

5. The fire warning system according to claim 3, characterized in that: The fire warning system also includes a warning device; the monitoring terminal realizes fire warning of the distribution network by controlling the warning device to emit sound and light signals.

6. The fire warning system according to claim 3, characterized in that: The monitoring terminal is specifically used for: According to the ground fault monitoring results of each AC power source, the AC power source with a ground fault is screened out; Filtering out temperature data of a preset monitoring point corresponding to the AC power source having a ground fault from the received temperature data; Determining whether a fire warning is required based on temperature data of a preset monitoring point corresponding to the AC power source with a ground fault; Alternatively, it is determined whether a fire warning is required based directly on the received temperature data.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 1 are implemented.

Images