Power distribution network fault positioning method, device, equipment, medium and program product
By installing current transformers and protective switches in the distribution network, the distance to the fault point is calculated using abnormal current and tripping data, and the location of the fault point is determined in combination with the line diagram. This solves the problem of low efficiency in manual fault location in the existing technology and achieves efficient fault location.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- MEIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CORP
- Filing Date
- 2026-01-19
- Publication Date
- 2026-05-19
AI Technical Summary
Existing methods for locating faults in power distribution networks rely on manual inspections, resulting in low efficiency in fault location.
Multiple current transformers and protective switches are installed in the power distribution network. By acquiring abnormal current data and tripping data, combined with transmission voltage, frequency, resistance and inductance, the distance to the fault point is calculated, and the location of the fault point is determined by combining the number of current transformers and the circuit diagram.
No manual positioning is required, which improves the efficiency and accuracy of fault location.
Smart Images
Figure CN122063379A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power grid technology, and in particular to a method, apparatus, equipment, medium and program product for fault location in distribution networks. Background Technology
[0002] With the development of science and technology and society, the power grid coverage is expanding, providing convenience for people's lives and production. During operation, faults are inevitable in power distribution networks. To ensure timely maintenance, it is necessary to pinpoint the location of the fault.
[0003] In existing technologies, in order to determine the location of a fault, staff usually conduct inspections of the lines, using visual inspection, auditory judgment, and simple tools such as infrared thermometers to determine the location of the fault.
[0004] In summary, existing methods for locating faults in power distribution networks rely on manual methods to determine the location of faults, resulting in low efficiency in fault location. Summary of the Invention
[0005] The distribution network fault location method, device, equipment, medium, and program products provided in this application are used to solve the problem that the existing distribution network fault location methods rely on manual methods to determine the location of fault points, resulting in low efficiency in fault location.
[0006] In a first aspect, embodiments of this application provide a method for locating faults in a power distribution network, including:
[0007] Acquire abnormal current data sent by at least one target current transformer and tripping data sent by a target protection switch. Each target current transformer is a current transformer installed in the distribution network that detects an abnormal current. The target protection switch is a protection switch installed in the distribution network that trips. The abnormal current data sent by each target current transformer includes the abnormal current and the identifier of the target current transformer.
[0008] Based on the abnormal current sent by each target current transformer, as well as the obtained transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, the distance to the fault point corresponding to each target current transformer is determined.
[0009] The location of the target fault point is determined based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, the preset distribution network line diagram, and the tripping data.
[0010] In one possible implementation, determining the location of the target fault point based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, a preset distribution network line diagram, and the tripping data includes:
[0011] For each target current transformer, the position of the target current transformer is determined according to the identifier of the target current transformer and the preset correspondence between current transformers and positions.
[0012] For each target current transformer, the location of the candidate fault point corresponding to the target current transformer is determined based on the location of the target current transformer, the distance of the fault point corresponding to the target current transformer, and the preset distribution network line diagram.
[0013] The location of the target fault point is determined based on the number of target current transformers, the tripping data, and the location of the candidate fault point corresponding to each target current transformer.
[0014] In one possible implementation, determining the location of the target fault point based on the number of target current transformers, the tripping data, and the location of the candidate fault point corresponding to each target current transformer includes:
[0015] If the number of target current transformers is equal to 1, then the location of the target fault point is determined based on the tripping data and the location of the candidate fault point corresponding to the target current transformer.
[0016] If the number of target current transformers is greater than 1, then the locations of the candidate fault points corresponding to all target current transformers are clustered to obtain multiple sets of fault point locations.
[0017] The set with the most candidate fault point locations among the multiple fault point location sets shall be taken as the target set;
[0018] The center point of the candidate fault point location in the target set is used as the reference position;
[0019] The location point in the power distribution network that is closest to the reference location is taken as the location of the target fault point.
[0020] In one possible implementation, the trip data includes the identifier of the target protection switch, and determining the location of the target fault point based on the trip data and the candidate fault point location corresponding to the target current transformer includes:
[0021] Based on the correspondence between the protection switch identifier and the protection area, the target protection area corresponding to the identifier of the target protection switch is determined;
[0022] The location of the target fault point is the position within the target protection area among the candidate fault point locations corresponding to the target current transformer.
[0023] In one possible implementation, if the number of target current transformers is equal to 1, the method further includes:
[0024] Obtain the sensing area of the target current transformer;
[0025] The location of the target fault point that belongs to the sensing area of the target current transformer is taken as the updated target fault point location.
[0026] In one possible implementation, determining the distance to the fault point corresponding to each target current transformer based on the abnormal current transmitted by each target current transformer, and the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, includes:
[0027] Calculate the impedance per unit length based on the transmission frequency, the resistance per unit length, and the inductance per unit length;
[0028] Based on the transmission voltage, the impedance per unit length, and the abnormal current transmitted by each target current transformer, the distance to the fault point corresponding to each target current transformer is determined.
[0029] In one possible implementation, each abnormal current data point further includes the transmission time. Before determining the distance to the fault point corresponding to each target current transformer based on the abnormal current transmitted by each target current transformer, and the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, the method further includes:
[0030] The transmission time interval is determined based on the transmission time in each abnormal current data.
[0031] Acquire peak electricity consumption information, as well as grid connection information and power grid structure adjustment information within the transmission time interval;
[0032] Based on the transmission time interval, the peak electricity consumption information, and the grid connection information and power grid structure adjustment information within the transmission time interval, determine whether there is a fault in the distribution network;
[0033] The step of determining the distance to the fault point corresponding to each target current transformer based on the abnormal current transmitted by each target current transformer, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, includes:
[0034] If a fault is identified in the distribution network, the distance to the fault point corresponding to each target current transformer is determined based on the abnormal current transmitted by each target current transformer, as well as the obtained transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length.
[0035] Secondly, embodiments of this application provide a power distribution network fault location device, comprising:
[0036] The acquisition module is used to acquire abnormal current data sent by at least one target current transformer and tripping data sent by a target protection switch. Each target current transformer is a current transformer installed in the distribution network that detects an abnormal current. The target protection switch is a protection switch installed in the distribution network that trips. The abnormal current data sent by each target current transformer includes the abnormal current and the identifier of the target current transformer.
[0037] The processing module is used to determine the distance to the fault point corresponding to each target current transformer based on the abnormal current sent by each target current transformer, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length.
[0038] The positioning module is used to determine the location of the target fault point based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, the preset distribution network line diagram, and the tripping data.
[0039] Thirdly, embodiments of this application provide an electronic device, including:
[0040] Processor, memory, communication interface;
[0041] The memory is used to store the executable instructions of the processor;
[0042] The processor is configured to execute the power distribution network fault location method according to any one of the first aspects by executing the executable instructions.
[0043] Fourthly, embodiments of this application provide a readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the power distribution network fault location method described in any of the first aspects.
[0044] Fifthly, embodiments of this application provide a computer program product, including a computer program, which, when executed by a processor, is used to implement the power distribution network fault location method described in any of the first aspects.
[0045] The distribution network fault location method, device, equipment, medium, and program products provided in this application embodiment, by installing multiple current transformers and multiple protective switches in the distribution network, acquire abnormal current data sent by at least one target current transformer and tripping data sent by one target protective switch. Then, based on the abnormal current in the abnormal current data, and the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, the distance to the fault point corresponding to each target current transformer is determined; furthermore, by combining the number of target current transformers, the identifier of each target current transformer, and the preset distribution network line diagram and tripping data, the location of the target fault point is determined. This solution determines the distance to the fault point through abnormal current data sent by the target current transformers, and then determines the location of the target fault point by combining the number of target current transformers and tripping data, eliminating the need for manual location and improving location efficiency. Attached Figure Description
[0046] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0047] Figure 1 A schematic diagram illustrating the application scenario of the power distribution network fault location method provided in this application;
[0048] Figure 2 A flowchart illustrating an embodiment of the power distribution network fault location method provided in this application;
[0049] Figure 3 A schematic diagram showing the locations of the candidate fault points provided in this application;
[0050] Figure 4 A flowchart illustrating Embodiment 2 of the power distribution network fault location method provided in this application;
[0051] Figure 5 A schematic diagram of the target protection area provided in this application;
[0052] Figure 6 This is a clustering diagram provided for this application;
[0053] Figure 7 Schematic diagram of the target fault location provided in this application Figure 1 ;
[0054] Figure 8 Schematic diagram of the target fault location provided in this application Figure 2 ;
[0055] Figure 9 A flowchart illustrating Embodiment 3 of the power distribution network fault location method provided in this application;
[0056] Figure 10This is a schematic diagram of the structure of an embodiment of the power distribution network fault location device provided in this application;
[0057] Figure 11 This is a schematic diagram of the structure of an electronic device provided in this application.
[0058] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0059] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0060] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0061] With the development of science and technology and society, the power grid coverage is expanding, providing convenience for people's lives and production. During operation, faults are inevitable in power distribution networks. To ensure timely maintenance, it is necessary to pinpoint the location of the fault.
[0062] In existing technologies, in order to determine the location of a fault, staff usually conduct inspections of the lines, using visual inspection, auditory judgment, and simple tools such as infrared thermometers to determine the location of the fault. This leads to low efficiency in fault location.
[0063] To address the problems existing in the prior art, the inventors, during their research on distribution network fault location methods, discovered that to improve fault location efficiency, multiple current transformers and protective switches can be installed in the distribution network. When a current abnormality is detected, the current transformer sends abnormal current data, and the protective switch trips and sends trip data upon detecting the abnormal current. Therefore, based on the abnormal current data, combined with transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, the distance to the fault point can be determined. Furthermore, by combining the number of current transformers sending abnormal current data, a preset distribution network circuit diagram, and trip data, the location of the target fault point can be determined, effectively improving fault location efficiency. Based on the above inventive concept, the distribution network fault location scheme of this application was designed.
[0064] The execution subject of the power distribution network fault location method in this application can be a server, a computer, a terminal device, etc. This application does not limit it. The following description uses a server as an example.
[0065] For example, Figure 1 This is a schematic diagram illustrating the application scenario of the power distribution network fault location method provided in this application, such as... Figure 1 As shown in the figure, the black rectangle represents the current transformer, the black triangle represents the protection switch, and the cross indicates the location of the target fault point.
[0066] In this application scenario, a short circuit fault occurs at the target fault location. Current transformers A, B, and C will detect the abnormal current and generate abnormal current data, which will be sent to the server. Protective switch D will also detect the abnormal current, trip, and generate trip data, which will be sent to the server.
[0067] Current transformers A, B, and C serve as target current transformers, and protective switch D serves as the target protective switch. Abnormal current data includes the abnormal current and the identifier of the target current transformer.
[0068] The server determines the distance to the fault point corresponding to each target current transformer based on the abnormal current sent by each target current transformer, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length.
[0069] Then, based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, and the preset distribution network line diagram and tripping data, the location of the target fault point is determined.
[0070] The server can send the location of the target fault point to the staff's terminal device, and the staff can then go to the target fault point to carry out repairs.
[0071] It should be noted that, Figure 1This is merely a schematic diagram illustrating one application scenario provided by an embodiment of this application. This embodiment does not necessarily represent... Figure 1 The document does not limit the actual form of the various devices included, nor does it specify the form of the devices. Figure 1 The interaction methods between devices are limited, and can be set according to actual needs in the specific application of the solution.
[0072] The technical solution of this application will now be described in detail through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.
[0073] Figure 2 This is a flowchart illustrating an embodiment of the power distribution network fault location method provided in this application. This embodiment describes how a server determines the location of a target fault point based on abnormal current data and tripping data. The method in this embodiment can be implemented through software, hardware, or a combination of both. Figure 2 As shown, the method for locating faults in a power distribution network specifically includes the following steps:
[0074] S201: Obtain abnormal current data sent by at least one target current transformer and tripping data sent by a target protection switch.
[0075] In a power distribution network, multiple current transformers and multiple protective switches are installed. When a fault occurs in the distribution network, at least one current transformer near the fault location will detect an abnormal current and generate abnormal current data, which will be sent to the server. This current transformer is the target current transformer. A protective switch near the fault location will also detect an abnormal current and trip, generating trip data which will be sent to the server. This protective switch is the target protective switch.
[0076] In this step, to determine the location of the fault, it is necessary to acquire abnormal current data sent by at least one target current transformer and tripping data sent by the target protection switch. The abnormal current data sent by each target current transformer includes the abnormal current and the identifier of the target current transformer.
[0077] It should be noted that the current transformer detects whether the current is abnormal by detecting whether the current exceeds a preset current threshold. When the detected current exceeds the preset current threshold, the current is determined to be abnormal. The preset current threshold can be 100A, 200A, 300A, etc. This application embodiment does not limit the preset current threshold; it can be determined according to the actual situation.
[0078] It should be noted that an alarm system can be installed in the distribution network. When a fault occurs in the distribution network, the alarm system will send an alarm message to the server. When the server receives the alarm message, it will obtain abnormal current data and tripping data.
[0079] It should be noted that the current transformers in the distribution network can send current data to the server in real time. This current data includes both the current itself and the current transformer's identifier. When the server receives an alarm message, it can filter the current data received within a preset time period after receiving the alarm message, and then detect if there is a current exceeding a preset current threshold. Current data exceeding the preset current threshold is designated as abnormal current data, and the identifier in the abnormal current data is used as the identifier of the target current transformer. The preset time period can be 3 seconds, 5 seconds, 10 seconds, etc. This embodiment does not limit the preset time period; it can be determined according to actual conditions.
[0080] S202: Based on the abnormal current sent by each target current transformer, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, determine the distance to the fault point corresponding to each target current transformer.
[0081] In this step, after the server obtains the abnormal current data sent by each target current transformer, it combines the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length to determine the distance to the fault point corresponding to each target current transformer.
[0082] Specifically, the impedance per unit length is calculated based on the transmission frequency, resistance per unit length, and inductance per unit length.
[0083] According to the formula Calculate the impedance per unit length. Wherein, R represents the impedance per unit length, and R represents the resistance per unit length. Indicates the transmission frequency. Inductance per unit length.
[0084] Then, based on the transmission voltage, the impedance per unit length, and the abnormal current sent by each target current transformer, the distance to the fault point corresponding to each target current transformer is determined.
[0085] According to the formula Calculate the distance to the fault point corresponding to each target current transformer. Among these calculations... , j represents the j-th target current transformer, Let V represent the abnormal current transmitted by the j-th target current transformer, V represent the transmission voltage, and d represent the unit length. This represents the total impedance from the j-th target current transformer to the fault point. Represents the impedance per unit length. This represents the distance to the fault point corresponding to the j-th target current transformer.
[0086] It should be noted that the unit length can be 100m, 1km, 10km, etc. This application does not limit the unit length, and it can be determined according to the actual situation.
[0087] It should be noted that this data can be obtained because the server already stores the transmission voltage, transmission frequency, resistance per unit length, inductance per unit length, and unit length of the power distribution network.
[0088] S203: Determine the location of the target fault point based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, and the preset distribution network line diagram and tripping data.
[0089] In this step, after the server determines the distance to the fault point corresponding to each target current transformer, it can determine the location of the target fault point based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, and the preset distribution network line diagram and tripping data.
[0090] Specifically, for each target current transformer, the location of the target current transformer is determined according to its identifier and the preset correspondence between current transformers and locations.
[0091] For each target current transformer, the potential fault location is determined based on its location, the distance to the corresponding fault point, and the pre-defined distribution network diagram. Specifically, starting from the target current transformer's location on the pre-defined distribution network diagram, the distance to the fault point is extended along the line to obtain the potential fault location. Since there may be multiple extension directions and branching lines, multiple potential fault location locations may be obtained.
[0092] For example, Figure 3 A schematic diagram of the locations of the candidate fault points provided in this application, such as... Figure 3 As shown in the diagram, the straight lines form a preset distribution network line diagram. The black rectangles represent the locations of the target current transformers, and the black dots represent the locations of the candidate fault points corresponding to the target current transformers. The line distance between each candidate fault point and the target current transformer is equal, which is the distance to the fault point corresponding to the target current transformer.
[0093] Then, based on the number of target current transformers, tripping data, and the location of the candidate fault point corresponding to each target current transformer, the location of the target fault point is determined.
[0094] The server can then send the location of the target fault point to the staff's terminal device, so that the staff can go to the target fault point to carry out repairs.
[0095] It should be noted that the server can also determine the fault type based on the tripping data. The tripping data includes the tripping phase, indicating a short circuit in that phase. Therefore, the fault type can be determined based on the tripping phase. When the number of tripping phases in the tripping data is equal to 1, the fault type is determined to be a single-phase ground fault. When the number of tripping phases in the tripping data is equal to 2, the fault type is determined to be a two-phase ground fault. When the number of tripping phases in the tripping data is equal to 3, the fault type is determined to be a three-phase ground fault.
[0096] It should be noted that the server can also generate fault reports, which include the location of the target fault point, the fault type, and the time of the fault.
[0097] The distribution network fault location method provided in this embodiment involves installing multiple current transformers and multiple protective switches in the distribution network. After acquiring abnormal current data from at least one target current transformer and tripping data from one target protective switch, the distance to the fault point corresponding to each target current transformer is determined based on the abnormal current in the abnormal current data, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length. Then, by combining the number of target current transformers, the identifier of each target current transformer, a preset distribution network diagram, and the tripping data, the location of the target fault point is determined. This solution determines the fault point distance through abnormal current data from the target current transformers, and then, by combining the number of target current transformers and the tripping data, determines the location of the target fault point, eliminating the need for manual location and improving fault location efficiency.
[0098] Figure 4 This is a flowchart illustrating Embodiment 2 of the power distribution network fault location method provided in this application. Based on the above embodiments, this application embodiment describes how the server determines the location of the target fault point according to the number of target current transformers, tripping data, and the location of the candidate fault point corresponding to each target current transformer. Figure 4 As shown, the method for locating faults in a power distribution network specifically includes the following steps:
[0099] S401: Determine if the number of target current transformers is equal to 1; if the number of target current transformers is equal to 1, proceed to step S402; if the number of target current transformers is greater than 1, proceed to steps S403-S406.
[0100] In this step, after the server obtains the location of the candidate fault point corresponding to each target current transformer, since the number of target current transformers is different and the processing method is different, it is necessary to determine whether the number of target current transformers is equal to 1.
[0101] S402: Determine the location of the target fault point based on the tripping data and the location of the candidate fault point corresponding to the target current transformer.
[0102] In this step, if the server determines that the number of target current transformers is equal to 1, since there is at least one candidate fault point location corresponding to the target current transformer, it is also necessary to combine the tripping data to determine the location of the target fault point.
[0103] Specifically, since the tripping data includes the identifier of the target protection switch, the target protection area corresponding to the identifier of the target protection switch can be determined based on the correspondence between the protection switch identifier and the protection area.
[0104] Then, the location within the target protection zone from the candidate fault locations corresponding to the target current transformer is taken as the target fault location. This is because a fault occurring within the protection zone of a protection switch will cause the protection switch to trip, so the location within the target protection zone is the target fault location.
[0105] For example, Figure 5 A schematic diagram of the target protected area provided in this application, such as Figure 5 As shown in the diagram, the straight lines form the preset distribution network line diagram. The black rectangles represent the locations of the target current transformers, the black dots represent the locations of the candidate fault points corresponding to the target current transformers, the black triangles represent the target protection switches, and the circular dashed lines represent the target protection zones corresponding to the identification of the target protection switches. Only the candidate fault point location E belongs to the target protection zone, therefore, candidate fault point location E is the target fault point location.
[0106] It should be noted that if the number of candidate fault locations corresponding to the target current transformer is 1, then there is no need to use trip data to determine the target fault location; the candidate fault location can be directly used as the target fault location. If the number of candidate fault locations corresponding to the target current transformer is greater than 1, then trip data is used to determine the target fault location.
[0107] It should be noted that if there are multiple candidate fault locations belonging to the target protection area, then the multiple candidate fault locations belonging to the target protection area will be used as the target fault location.
[0108] It should be noted that if none of the candidate fault locations corresponding to the target current transformer are within the target protection area, an abnormality warning message will be output to alert the staff that the target current transformer and the target protection switch are malfunctioning.
[0109] It should be noted that after obtaining the location of the target fault point, the server can also obtain the sensing area of the target current transformer corresponding to the current transformer's identifier based on the correspondence between the current transformer identifier and the sensing area; and then update the target fault point location based on the sensing area. The server can also update the target fault point location based on the sensing area when the number of target fault point locations is greater than one. When a fault occurs within the sensing area of a current transformer, the current transformer can detect an abnormal current.
[0110] The method for updating the target fault location based on the sensing area is as follows: the location of the target fault location that belongs to the sensing area of the target current transformer is taken as the updated target fault location.
[0111] S403: Cluster the locations of the candidate fault points corresponding to all target current transformers to obtain multiple sets of fault point locations.
[0112] In this step, if the server determines that the number of target current transformers is greater than one, even if there are multiple candidate fault locations corresponding to each target current transformer, they can assist each other in the judgment. This is because among the candidate fault locations corresponding to each target current transformer, there is one candidate fault location near the target fault location. Therefore, there are many candidate fault locations near the target fault location, while the other candidate fault locations are relatively scattered. The candidate fault locations corresponding to all target current transformers can be clustered to obtain multiple sets of fault location locations.
[0113] It should be noted that the method for clustering the locations of candidate fault points can be k-means clustering algorithm, density peak clustering algorithm, mean drift clustering algorithm, density-based spatial clustering of applications with noise (DBSCAN), etc. This application does not limit the clustering method, and it can be determined according to the actual situation.
[0114] S404: Select the set with the most candidate fault locations from multiple fault location sets as the target set.
[0115] In this step, after the server determines multiple sets of fault location locations, since there are many candidate fault location locations near the target fault location, the set with the most candidate fault location locations among the multiple sets of fault location locations is taken as the target set.
[0116] For example, Figure 6 The clustering diagram provided in this application is as follows: Figure 6As shown in the diagram, the black lines represent the power distribution network, and the black dots represent the locations of potential fault points. Each dashed circle represents a class, and the potential fault point locations within the dashed circles form a set of fault point locations. Potential fault point locations F form one set, potential fault point locations G form another set, potential fault point locations H, I, and J form another set, potential fault point locations K and L form another set, and potential fault point locations M form yet another set. Therefore, the set of fault point locations formed by potential fault point locations H, I, and J is used as the target set.
[0117] S405: Use the center point of the candidate fault location in the target set as the reference position.
[0118] In this step, after the server obtains the target set, in order to determine the accurate location of the target fault point, it needs to use the center point of the candidate fault point location in the target set as the reference position.
[0119] S406: The point in the distribution network closest to the reference location is taken as the target fault location.
[0120] In this step, after the server determines the reference location, it takes the point in the power distribution network that is closest to the reference location as the target fault location.
[0121] For example, Figure 7 Schematic diagram of the target fault location provided in this application Figure 1 ,like Figure 7 As shown, points N and P are the locations of candidate fault points in the target set, and point O is the center point of the candidate fault point locations in the target set, which is also the reference point. Since point O is located within the distribution network line, point O is the target fault point location.
[0122] For example, Figure 8 Schematic diagram of the target fault location provided in this application Figure 2 ,like Figure 8 As shown, points Q and R are the locations of candidate fault points in the target set, and point S is the center point of the candidate fault point locations in the target set, which is also the reference point. Since point T is the closest point to point S in the distribution network, point T is the target fault point location.
[0123] In one implementation, the location of the candidate fault point in the target set can be used as the target fault point location.
[0124] In one implementation, a set of fault point locations where the number of candidate fault point locations exceeds a preset threshold can be used as a target set. A target fault point location is then determined based on the candidate fault point locations in each target set. The existence of multiple target sets indicates the presence of multiple fault points. The preset threshold can be 2, 3, 4, etc. This embodiment does not limit the preset threshold; it can be determined based on actual circumstances.
[0125] The distribution network fault location method provided in this embodiment effectively improves the accuracy of determining the location of the target fault point by determining the location of the target fault point through tripping data when the number of target current transformers is equal to 1, and by determining the location of the target fault point through clustering when the number of target current transformers is greater than 1.
[0126] Figure 9 This is a flowchart illustrating a third embodiment of the power distribution network fault location method provided in this application. Based on the above embodiments, this application describes the situation where the server determines whether a fault exists in the power distribution network before calculating the distance to the fault point. Figure 9 As shown, the method for locating faults in a power distribution network specifically includes the following steps:
[0127] S901: Determine the transmission time interval based on the transmission time in each abnormal current data.
[0128] In this step, in order to determine whether a fault has occurred in the power distribution network, after the server obtains the abnormal current data, since each abnormal current data also includes the transmission time, the transmission time interval can be determined based on the transmission time in each abnormal current data.
[0129] The earliest transmission time among all abnormal current data is taken as the starting point of the transmission time interval; the latest transmission time among all abnormal current data is taken as the ending point of the transmission time interval.
[0130] S902: Obtain peak electricity consumption information, as well as grid connection information and power grid structure adjustment information within the transmission time interval.
[0131] In this step, in order to determine whether the increase in current in the distribution network is caused by peak electricity consumption, grid connection of distributed power sources, or adjustments to the distribution network structure, which may lead to the target current transformer detecting an abnormal current, the server needs to acquire peak electricity consumption information, as well as grid connection information and grid structure adjustment information within the transmission time interval.
[0132] Peak electricity consumption information includes peak electricity consumption periods.
[0133] Grid connection information refers to information about distributed generation accessing the distribution network. Grid connection information within the transmission time interval refers to grid connection information whose acquisition time falls within the transmission time interval; grid connection information within the transmission time interval can be empty.
[0134] The power grid structure adjustment information refers to the structural adjustments of the distribution network. The power grid structure adjustment information within the transmission time interval refers to the power grid structure adjustment information whose acquisition time falls within the transmission time interval; the power grid structure adjustment information within the transmission time interval can be empty.
[0135] Since staff use terminal devices to send grid connection information and power grid structure adjustment information to the server, the server records the acquisition time when it receives the grid connection information and power grid structure adjustment information, so it can obtain the grid connection information and power grid structure adjustment information within the sending time interval.
[0136] S903: Determine whether there is a fault in the distribution network based on the transmission time interval, peak electricity consumption information, grid connection information and power grid structure adjustment information within the transmission time interval.
[0137] In this step, after the server obtains peak electricity consumption information, as well as grid connection information and power grid structure adjustment information within the transmission time interval, it determines whether there is a fault in the distribution network based on the transmission time interval, peak electricity consumption information, grid connection information, and power grid structure adjustment information within the transmission time interval.
[0138] Specifically, if the server determines that the peak electricity consumption period includes the transmission time interval, or that the grid connection information within the transmission time interval is not empty, or that the power grid structure adjustment information within the transmission time interval is not empty, then it determines that there is no fault in the distribution network.
[0139] If the server determines that the peak electricity consumption period does not include the transmission time interval, and that the grid connection information within the transmission time interval is empty, and the power grid structure adjustment information within the transmission time interval is empty, then it determines that there is a fault in the distribution network.
[0140] S904: If a fault is found in the distribution network, determine the distance to the fault point corresponding to each target current transformer based on the abnormal current sent by each target current transformer, as well as the obtained transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length.
[0141] In this step, if the server determines that there is a fault in the power distribution network, it determines the distance to the fault point corresponding to each target current transformer based on the abnormal current sent by each target current transformer, as well as the obtained transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length.
[0142] It should be noted that the method for determining the distance to the fault point corresponding to each target current transformer is similar to step S202 in Embodiment 1, and will not be repeated here.
[0143] It should be noted that if the server determines that there is no fault in the power distribution network, it will discard abnormal current data and tripping data.
[0144] The distribution network fault location method provided in this embodiment determines whether there is a fault in the distribution network by using the transmission time interval, peak electricity consumption information, grid connection information and power grid structure adjustment information within the transmission time interval. When a fault is determined in the distribution network, the method determines the distance to the fault point corresponding to each target current transformer, thereby improving the accuracy of fault detection and reducing the occurrence of maintenance work by personnel due to non-fault reasons.
[0145] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.
[0146] Figure 10 This is a structural schematic diagram of an embodiment of the power distribution network fault location device provided in this application. Figure 10 As shown, the power distribution network fault location device 1000 includes:
[0147] The acquisition module 1001 is used to acquire abnormal current data sent by at least one target current transformer and tripping data sent by a target protection switch. Each target current transformer is a current transformer installed in the distribution network that detects an abnormal current. The target protection switch is a protection switch installed in the distribution network that trips. The abnormal current data sent by each target current transformer includes the abnormal current and the identifier of the target current transformer.
[0148] The processing module 1002 is used to determine the distance to the fault point corresponding to each target current transformer based on the abnormal current sent by each target current transformer, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length.
[0149] The positioning module 1003 is used to determine the location of the target fault point based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, the preset distribution network line diagram, and the tripping data.
[0150] Furthermore, the positioning module 1003 is specifically used for:
[0151] For each target current transformer, the position of the target current transformer is determined according to the identifier of the target current transformer and the preset correspondence between current transformers and positions.
[0152] For each target current transformer, the location of the candidate fault point corresponding to the target current transformer is determined based on the location of the target current transformer, the distance of the fault point corresponding to the target current transformer, and the preset distribution network line diagram.
[0153] The location of the target fault point is determined based on the number of target current transformers, the tripping data, and the location of the candidate fault point corresponding to each target current transformer.
[0154] Furthermore, the positioning module 1003 is specifically used for:
[0155] If the number of target current transformers is equal to 1, then the location of the target fault point is determined based on the tripping data and the location of the candidate fault point corresponding to the target current transformer.
[0156] If the number of target current transformers is greater than 1, then the locations of the candidate fault points corresponding to all target current transformers are clustered to obtain multiple sets of fault point locations.
[0157] The set with the most candidate fault point locations among the multiple fault point location sets shall be taken as the target set;
[0158] The center point of the candidate fault point location in the target set is used as the reference position;
[0159] The location point in the power distribution network that is closest to the reference location is taken as the location of the target fault point.
[0160] Furthermore, the tripping data includes the identifier of the target protection switch, and the positioning module 1003 is specifically used for:
[0161] Based on the correspondence between the protection switch identifier and the protection area, the target protection area corresponding to the identifier of the target protection switch is determined;
[0162] The location of the target fault point is the position within the target protection area among the candidate fault point locations corresponding to the target current transformer.
[0163] Furthermore, if the number of target current transformers is equal to 1, the acquisition module 1001 is also used to acquire the sensing area of the target current transformer;
[0164] The positioning module 1003 is further configured to use the position of the sensing area of the target current transformer in the target fault point location as the updated target fault point location.
[0165] Furthermore, the processing module 1002 is specifically used for:
[0166] Calculate the impedance per unit length based on the transmission frequency, the resistance per unit length, and the inductance per unit length;
[0167] Based on the transmission voltage, the impedance per unit length, and the abnormal current transmitted by each target current transformer, the distance to the fault point corresponding to each target current transformer is determined.
[0168] Furthermore, each abnormal current data also includes the transmission time. Before determining the distance to the fault point corresponding to each target current transformer based on the abnormal current transmitted by each target current transformer, and the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, the processing module 1002 is further configured to:
[0169] The transmission time interval is determined based on the transmission time in each abnormal current data.
[0170] The acquisition module 1001 is also used to acquire peak electricity consumption information, as well as grid connection information and power grid structure adjustment information within the transmission time interval;
[0171] The processing module 1002 is further configured to:
[0172] Based on the transmission time interval, the peak electricity consumption information, and the grid connection information and power grid structure adjustment information within the transmission time interval, determine whether there is a fault in the distribution network;
[0173] If a fault is identified in the distribution network, the distance to the fault point corresponding to each target current transformer is determined based on the abnormal current transmitted by each target current transformer, as well as the obtained transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length.
[0174] The power distribution network fault location device provided in this embodiment is used to execute the technical solution in any of the aforementioned method embodiments. Its implementation principle and technical effect are similar, and will not be described again here.
[0175] Figure 11 This is a schematic diagram of the structure of an electronic device provided in this application. Figure 11 As shown, the electronic device 1100 includes:
[0176] Processor 1101, memory 1102, and communication interface 1103;
[0177] The memory 1102 is used to store the executable instructions of the processor 1101;
[0178] The processor 1101 is configured to execute the technical solutions in any of the foregoing method embodiments by executing the executable instructions.
[0179] Optionally, the memory 1102 can be either standalone or integrated with the processor 1101.
[0180] Optionally, when the memory 1102 is a device independent of the processor 1101, the electronic device 1100 may further include:
[0181] Bus 1104, memory 1102 and communication interface 1103 are connected to processor 1101 through bus 1104 and complete communication with each other. Communication interface 1103 is used to communicate with other devices.
[0182] Optionally, the communication interface 1103 can be implemented using a transceiver. The communication interface is used to enable communication between the database access device and other devices (e.g., clients, read-write databases, and read-only databases). The memory may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk drive.
[0183] Bus 1104 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus.
[0184] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.
[0185] The electronic device is used to execute the technical solutions in any of the foregoing method embodiments. Its implementation principle and technical effect are similar, and will not be described again here.
[0186] This application also provides a readable storage medium storing a computer program thereon, which, when executed by a processor, implements the technical solutions provided in any of the foregoing method embodiments.
[0187] This application also provides a computer program product, including a computer program, which, when executed by a processor, is used to implement the technical solutions provided in any of the foregoing method embodiments.
[0188] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.
[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A method for locating faults in a power distribution network, characterized in that, include: Acquire abnormal current data sent by at least one target current transformer and tripping data sent by a target protection switch. Each target current transformer is a current transformer installed in the distribution network that detects an abnormal current. The target protection switch is a protection switch installed in the distribution network that trips. The abnormal current data sent by each target current transformer includes the abnormal current and the identifier of the target current transformer. Based on the abnormal current sent by each target current transformer, as well as the obtained transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, the distance to the fault point corresponding to each target current transformer is determined. The location of the target fault point is determined based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, the preset distribution network line diagram, and the tripping data.
2. The method according to claim 1, characterized in that, The step of determining the location of the target fault point based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, the preset distribution network line diagram, and the tripping data includes: For each target current transformer, the position of the target current transformer is determined according to the identifier of the target current transformer and the preset correspondence between current transformers and positions. For each target current transformer, the location of the candidate fault point corresponding to the target current transformer is determined based on the location of the target current transformer, the distance of the fault point corresponding to the target current transformer, and the preset distribution network line diagram. The location of the target fault point is determined based on the number of target current transformers, the tripping data, and the location of the candidate fault point corresponding to each target current transformer.
3. The method according to claim 2, characterized in that, The step of determining the location of the target fault point based on the number of target current transformers, the tripping data, and the location of the candidate fault point corresponding to each target current transformer includes: If the number of target current transformers is equal to 1, then the location of the target fault point is determined based on the tripping data and the location of the candidate fault point corresponding to the target current transformer. If the number of target current transformers is greater than 1, then the locations of the candidate fault points corresponding to all target current transformers are clustered to obtain multiple sets of fault point locations. The set with the most candidate fault point locations among the multiple fault point location sets shall be taken as the target set; The center point of the candidate fault point location in the target set is used as the reference position; The location point in the power distribution network that is closest to the reference location is taken as the location of the target fault point.
4. The method according to claim 3, characterized in that, The tripping data includes the identifier of the target protection switch. Determining the location of the target fault point based on the tripping data and the candidate fault point location corresponding to the target current transformer includes: Based on the correspondence between the protection switch identifier and the protection area, the target protection area corresponding to the identifier of the target protection switch is determined; The location of the target fault point is the position within the target protection area among the candidate fault point locations corresponding to the target current transformer.
5. The method according to claim 3, characterized in that, If the number of target current transformers is equal to 1, the method further includes: Obtain the sensing area of the target current transformer; The location of the target fault point that belongs to the sensing area of the target current transformer is taken as the updated target fault point location.
6. The method according to claim 1, characterized in that, The step of determining the distance to the fault point corresponding to each target current transformer based on the abnormal current transmitted by each target current transformer, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, includes: Calculate the impedance per unit length based on the transmission frequency, the resistance per unit length, and the inductance per unit length; Based on the transmission voltage, the impedance per unit length, and the abnormal current transmitted by each target current transformer, the distance to the fault point corresponding to each target current transformer is determined.
7. The method according to any one of claims 1 to 6, characterized in that, Each abnormal current data also includes the transmission time. Before determining the distance to the fault point corresponding to each target current transformer based on the abnormal current transmitted by each target current transformer, and the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, the method further includes: The transmission time interval is determined based on the transmission time in each abnormal current data. Acquire peak electricity consumption information, as well as grid connection information and power grid structure adjustment information within the transmission time interval; Based on the transmission time interval, the peak electricity consumption information, and the grid connection information and power grid structure adjustment information within the transmission time interval, determine whether there is a fault in the distribution network; The step of determining the distance to the fault point corresponding to each target current transformer based on the abnormal current transmitted by each target current transformer, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length, includes: If a fault is identified in the distribution network, the distance to the fault point corresponding to each target current transformer is determined based on the abnormal current transmitted by each target current transformer, as well as the obtained transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length.
8. A power distribution network fault location device, characterized in that, include: The acquisition module is used to acquire abnormal current data sent by at least one target current transformer and tripping data sent by a target protection switch. Each target current transformer is a current transformer installed in the distribution network that detects an abnormal current. The target protection switch is a protection switch installed in the distribution network that trips. The abnormal current data sent by each target current transformer includes the abnormal current and the identifier of the target current transformer. The processing module is used to determine the distance to the fault point corresponding to each target current transformer based on the abnormal current sent by each target current transformer, as well as the acquired transmission voltage, transmission frequency, resistance per unit length, and inductance per unit length. The positioning module is used to determine the location of the target fault point based on the number of target current transformers, the distance to the fault point corresponding to each target current transformer, the identifier of each target current transformer, the preset distribution network line diagram, and the tripping data.
9. An electronic device, characterized in that, include: Processor, memory, communication interface; The memory is used to store the executable instructions of the processor; The processor is configured to execute the power distribution network fault location method according to any one of claims 1 to 7 by executing the executable instructions.
10. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the power distribution network fault location method according to any one of claims 1 to 7.
11. A computer program product, characterized in that, It includes a computer program, which, when executed by a processor, is used to implement the power distribution network fault location method according to any one of claims 1 to 7.