Method and system for handling faults in a small current grounding system based on voltage characteristics

Abstract

The application provides a small-current grounding system fault processing method and system based on voltage characteristics, and the method comprises the following steps: when a grounding fault signal of a target topology island is acquired, acquiring the current zero sequence voltage or three-phase voltage of each target monitoring point; determining a fault auxiliary determination result according to the number ratio of the first monitoring points and the target monitoring points that satisfy the grounding voltage characteristics; when the fault auxiliary determination result represents that a grounding fault occurs, controlling a target jumper switch to trip, determining the target monitoring points whose voltage information no longer satisfies the grounding voltage characteristics after tripping as second monitoring points, determining a voltage auxiliary determination result target FA strategy according to the second number ratio of the second monitoring points and the first monitoring points, and executing the target FA strategy to perform self-healing of the target topology island. According to the technical scheme of the embodiment of the application, the voltage change of the monitoring points in the topology island can be used as an auxiliary determination basis for tripping accuracy, the accuracy of system fault processing is improved, and maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of small current grounding system, and in particular to a small current grounding system fault processing method and system based on voltage characteristics. BACKGROUND

[0002] With the popularity of small current grounding system, more and more manufacturers have realized the grounding fault analysis function of small current grounding system on the power distribution terminal. Combined with feeder automation (FA) technology, a line selection switch is installed at the head of each line of the small current grounding system to protect the outlet tripping when a fault occurs, thereby realizing the automatic removal of small current grounding fault. However, the technology of small current grounding protection is not mature enough at present, and the line selection switch is prone to false triggering, which leads to the situation that the staff cannot find the fault point after the outlet tripping when the line selection switch detects the in-bounds grounding. The accuracy of fault processing of the small current grounding system is low, and the manpower and material resources for maintenance are increased. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a small current grounding system fault processing method and system based on voltage characteristics, which can improve the accuracy of small current grounding system fault processing, improve user experience, and reduce maintenance costs.

[0004] In a first aspect, an embodiment of the present application provides a small current grounding system fault processing method based on voltage characteristics, applied to a small current grounding system, the small current grounding system comprising a plurality of topological islands, each topological island comprising a plurality of power supply lines, each power supply line being provided with a jump line switch and at least one monitoring point, the small current grounding system fault processing method based on voltage characteristics comprising:

[0005] When a grounding fault signal of a target topological island is acquired, the current voltage information of each target monitoring point of the target topological island is acquired, and the voltage information is used to indicate the zero sequence voltage or three-phase voltage of the target monitoring point;

[0006] The target monitoring point whose current voltage information meets the preset grounding voltage characteristics is determined as a first monitoring point, and a fault auxiliary determination result is determined according to the first quantity ratio of the first monitoring point and the target monitoring point;

[0007] When the fault auxiliary determination result represents that a grounding fault occurs, a fault power supply line is determined and a target jump line switch of the fault power supply line is controlled to perform tripping;

[0008] obtaining the voltage information of each of the target monitoring points after the target jumper switch trips, determining a second monitoring point as the target monitoring point whose voltage information after the target jumper switch trips no longer satisfies the ground voltage feature, and determining a voltage auxiliary determination result according to a second quantity ratio of the second monitoring point and the first monitoring point;

[0009] determining a target FA strategy from a preset FA strategy pool according to the voltage auxiliary determination result, and performing the target FA strategy to perform self-healing of the target topology island.

[0010] According to some embodiments of the present application, the determination of the fault auxiliary determination result according to the quantity ratio of the first monitoring point and the target monitoring point comprises:

[0011] When the first quantity ratio is greater than a preset first risk ratio value, the fault auxiliary determination result is determined as a first risk level, and the first risk level represents a ground fault;

[0012] Or, when the first quantity ratio is less than or equal to the first risk ratio value and greater than a preset second risk ratio value, the fault auxiliary determination result is determined as a second risk level, the second risk level represents a ground fault, and the risk of the ground fault represented by the second risk level is lower than that represented by the first risk level, and the first risk ratio value is greater than the second risk ratio value.

[0013] Or, when the first quantity ratio is less than the second risk ratio value, the fault auxiliary determination result is determined as a third risk level, and the third risk level represents no ground fault.

[0014] According to some embodiments of the present application, when the voltage information is used to indicate a zero sequence voltage, the ground voltage feature is used to indicate that the zero sequence voltage is greater than a first voltage threshold value, and the first voltage threshold value is determined according to a rated phase voltage of the monitoring point and a preset first proportion; or, when the voltage information is used to indicate a three-phase voltage, the ground voltage feature is used to indicate that a first phase voltage of the three-phase voltage is less than a second voltage threshold value, and second and third phase voltages are both greater than a third voltage threshold value, the second voltage threshold value is determined according to the rated phase voltage and a preset second proportion, the third voltage threshold value is determined according to the rated phase voltage and a preset third proportion, and the third voltage threshold value is greater than the rated phase voltage.

[0015] According to some embodiments of the present application, the determination of the target FA strategy from the preset FA strategy pool according to the voltage auxiliary determination result, and the performance of the target FA strategy to perform self-healing of the target topology island comprises:

[0016] When the voltage auxiliary determination result represents that the fault power supply line is selected correctly, maintaining the target jump switch to be kept open according to the target FA strategy, and resuming power supply of the power supply lines except the fault power supply line;

[0017] Or, when the voltage auxiliary determination result represents that the fault power supply line is selected incorrectly, closing the target jump switch and reporting line selection error information.

[0018] According to some embodiments of the present application, before the ground fault signal of the target topology island is acquired, the method further comprises:

[0019] Performing breadth-first search on each of the power supply lines, and determining a device configured with zero sequence voltage or three-phase voltage in the power supply line as the monitoring point;

[0020] When the number of the monitoring points is greater than a preset monitoring point number threshold, performing remote measurement on the monitoring points according to a preset period;

[0021] Writing the remote measurement data sent by each of the monitoring points into shared memory through a write process, and saving the remote measurement data in the shared memory to a remote measurement database through multiple read processes.

[0022] According to some embodiments of the present application, the shared memory is pre-allocated with a data storage array with fixed storage space, and the writing of the remote measurement data sent by each of the monitoring points into shared memory through a write process and the saving of the remote measurement data in the shared memory to a remote measurement database through multiple read processes comprise:

[0023] When the remote measurement data is acquired, determining a write position of the data storage array, the write position being used to indicate a currently writable position of the data storage array, and an initial position of the write position being a first address of the data storage array;

[0024] Starting from the write position, writing the remote measurement data into the data storage array through the write process, and updating the write position according to the amount of written data during the writing process, wherein when the write position reaches a tail address of the data storage array during the updating process, determining a first address of the data storage array as a next updated address;

[0025] Determining a read position of the data storage array, the read position being used to indicate a currently readable position of the data storage array, and an initial position of the read position being the first address of the data storage array;

[0026] When the distance between the write position and the read position is greater than a preset distance threshold, the telemetry data is read from the data storage array by at least one read process starting from the read position and saved to the telemetry database, wherein the amount of data read by each read process is less than or equal to the amount of data indicated by the distance threshold.

[0027] According to some embodiments of the present application, the telemetry data comprises voltage waveform curves, and the method further comprises:

[0028] When the ground fault signal is acquired, a voltage waveform of the target monitoring point of the fault power supply line at a fault time is acquired, the voltage waveform at the fault time is added to the voltage waveform curves, and the updated voltage waveform curves are saved to a telemetry history curve database.

[0029] When a fault information display request is acquired, the voltage waveform curves of each monitoring point are acquired from the telemetry history curve database and displayed.

[0030] In a second aspect, embodiments of the present application provide a small current grounding system fault processing device based on voltage characteristics, comprising at least one control processor and a memory connected in communication with the at least one control processor; the memory stores instructions executable by the at least one control processor, and the instructions are executed by the at least one control processor to enable the at least one control processor to execute the small current grounding system fault processing method based on voltage characteristics as described in the first aspect above.

[0031] In a third aspect, embodiments of the present application provide a small current grounding system, comprising the small current grounding system fault processing device based on voltage characteristics as described in the second aspect above.

[0032] In a fourth aspect, embodiments of the present application provide a computer readable storage medium storing computer executable instructions for executing the small current grounding system fault processing method based on voltage characteristics as described in the first aspect above.

[0033] According to the small current grounding system fault processing method based on voltage characteristics provided by the embodiment of the present application, at least the following beneficial effects are achieved: when the grounding fault signal of the target topology island is acquired, the current voltage information of each target monitoring point of the target topology island is acquired, and the voltage information is used to indicate the zero sequence voltage or three-phase voltage of the target monitoring point; the target monitoring point whose current voltage information meets the preset grounding voltage characteristics is determined as a first monitoring point, and a fault auxiliary determination result is determined according to the first quantity ratio of the first monitoring point and the target monitoring point; when the fault auxiliary determination result represents that the grounding fault occurs, the fault power supply line is determined and the target jumper switch of the fault power supply line is controlled to perform tripping; the voltage information of each target monitoring point after the target jumper switch is tripped is acquired, the target monitoring point whose voltage information after the target jumper switch is tripped no longer meets the grounding voltage characteristics is determined as a second monitoring point, and a voltage auxiliary determination result is determined according to the second quantity ratio of the second monitoring point and the first monitoring point; a target FA strategy is determined from a preset FA strategy pool according to the voltage auxiliary determination result, and the target topology island is self-healed by executing the target FA strategy. According to the technical solution of the embodiment of the present application, the change of the voltage information of the monitoring point in the target topology island can be used as the auxiliary determination basis of the tripping accuracy, the accuracy of the system fault processing is improved, and the maintenance cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a flowchart of the small current grounding system fault processing method based on voltage characteristics provided by an embodiment of the present application;

[0035] Figure 2 is a flowchart of a specific example provided by another embodiment of the present application;

[0036] Figure 3 is a flowchart of determining a monitoring point provided by another embodiment of the present application;

[0037] Figure 4 is a schematic diagram of a shared memory provided by another embodiment of the present application;

[0038] Figure 5 is a flowchart of writing telemetry data provided by another embodiment of the present application;

[0039] Figure 6 is a flowchart of displaying telemetry data provided by another embodiment of the present application;

[0040] Figure 7 is a structural diagram of the small current grounding system fault processing device based on voltage characteristics provided by another embodiment of the present application. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals, and thus repeated description is omitted. The embodiments described below are merely exemplary, and are used only for the purpose of explaining the present application, and should not be understood as limiting the present application.

[0042] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In the description of the present application, several meanings are one or more, and the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0044] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0045] This invention provides a method and system for handling faults in low-current grounding systems based on voltage characteristics. The method includes: when a grounding fault signal of a target topology island is obtained, acquiring the current voltage information of each target monitoring point on the target topology island, where the voltage information indicates the zero-sequence voltage or three-phase voltage of the target monitoring point; identifying the target monitoring point whose current voltage information satisfies a preset grounding voltage characteristic as a first monitoring point; determining a fault auxiliary judgment result based on a first ratio of the first monitoring point to the target monitoring point; when the fault auxiliary judgment result indicates a grounding fault, identifying the faulty power supply line and controlling the target jumper switch of the faulty power supply line to trip; acquiring the voltage information of each target monitoring point after the target jumper switch trips; identifying the target monitoring point whose voltage information no longer satisfies the grounding voltage characteristic after the target jumper switch trips as a second monitoring point; determining a voltage auxiliary judgment result based on a second ratio of the second monitoring point to the first monitoring point; determining a target FA strategy from a preset FA strategy pool based on the voltage auxiliary judgment result; and executing the target FA strategy to perform self-healing of the target topology island. According to the technical solution of the present invention, the change of voltage information of monitoring points within the target topology island can be used as an auxiliary basis for determining the accuracy of tripping, thereby improving the accuracy of system fault handling and reducing maintenance costs.

[0046] The control method of the present invention will be further described below with reference to the accompanying drawings.

[0047] Reference Figure 1 , Figure 1 A flowchart illustrating a fault handling method for a low-current grounding system based on voltage characteristics, provided by an embodiment of the present invention, includes, but is not limited to, the following steps:

[0048] S11, when a ground fault signal is obtained from the target topology island, the current voltage information of each target monitoring point of the target topology island is obtained. The voltage information is used to indicate the zero-sequence voltage or three-phase voltage of the target monitoring point.

[0049] S12, the target monitoring point whose current voltage information meets the preset grounding voltage characteristics is determined as the first monitoring point, and the fault auxiliary judgment result is determined according to the first quantity ratio between the first monitoring point and the target monitoring point;

[0050] S13, when the fault auxiliary judgment result indicates that a ground fault has occurred, determine the faulty power supply line and control the target jumper switch of the faulty power supply line to trip.

[0051] S14, obtaining voltage information of each target monitoring point after the target jumper switch trips, determining the target monitoring point whose voltage information after the target jumper switch trips no longer satisfies the grounding voltage feature as a second monitoring point, and determining a voltage auxiliary determination result according to a second quantity ratio of the second monitoring point and the first monitoring point;

[0052] S15, determining a target FA strategy from a preset FA strategy pool according to the voltage auxiliary determination result, and performing the target FA strategy to perform self-healing of the target topology island.

[0053] It should be noted that the small-current grounding system of the embodiment includes a plurality of topology islands, each topology island includes a plurality of power supply lines, the plurality of power supply lines of each topology island share one bus switch, and each power supply line is provided with a jumper switch and at least one monitoring point. The fault processing method of the embodiment is for the same topology island. In the small-current grounding system, when single-phase grounding occurs in the bus power supply range, the voltage information of all monitoring points of the topology island will change, and the voltage information can be zero sequence voltage or three-phase voltage. The specific type is determined according to the device configuration of the monitoring point. The change of the voltage information can be the increase of the zero sequence voltage, or the decrease of the single-phase voltage and the increase of the other two-phase voltage. According to the voltage change feature, although the fault point cannot be accurately located, when the change of the voltage information satisfies the grounding voltage feature, for example, the zero sequence voltage of the monitoring point increases to a specified threshold value, it can be determined that the target topology island has a grounding condition. If the line selector switch trips, the zero sequence voltage returns to normal, it can be confirmed that the line selector switch indeed correctly removes the grounding fault.

[0054] In some embodiments, when the voltage information is used to indicate the zero sequence voltage, the grounding voltage feature is used to indicate that the zero sequence voltage is greater than a first voltage threshold value, and the first voltage threshold value is determined according to the rated phase voltage of the monitoring point and a preset first ratio; or when the voltage information is used to indicate the three-phase voltage, the grounding voltage feature is used to indicate that the first phase voltage of the three-phase voltage is less than a second voltage threshold value, and the second phase voltage and the third phase voltage are both greater than a third voltage threshold value, the second voltage threshold value is determined according to the rated phase voltage and a preset second ratio, the third voltage threshold value is determined according to the rated phase voltage and a preset third ratio, and the third voltage threshold value is greater than the rated phase voltage.

[0055] Exemplarily, taking the first proportion as 30%, the second proportion as 70%, and the third proportion as 120% as an example, the first voltage threshold is 30% of the rated phase voltage, the second voltage threshold is 70% of the rated phase voltage, and the third voltage threshold is 120% of the rated phase voltage; for the scenario in which the voltage information is the zero sequence voltage, when the zero sequence voltage rises to more than 30% of the rated phase voltage, it can be determined that the voltage information meets the ground voltage feature; for the scenario in which the voltage information is the three-phase voltage, when the single-phase voltage drops to less than 70% of the rated phase voltage, and the voltages of the other two phases rise to more than 120% of the rated phase voltage, it can be determined that the voltage information meets the ground voltage feature. When the monitoring point is simultaneously configured with the zero sequence voltage and the three-phase voltage, the zero sequence voltage can be preferentially used as the basis for judgment, the number of comparisons is reduced, and the efficiency is improved.

[0056] It should be noted that, with reference to Figure 2 , after the monitoring point is powered on, it sends an uplink telemetry processing request to the control system of the small current grounding system, the control system responds to the request to perform uplink telemetry processing, saves the acquired telemetry data in the telemetry real-time online library, and continuously performs telemetry of the data according to a preset period. According to the principle described in the above embodiment, when the voltage information of the entire topology island has changed, and a part of the change amplitude is large enough, that is, it meets the ground voltage feature, it can be determined that a ground fault has occurred in the topology island. After acquiring the ground fault signal, the topology island sending the ground fault signal is determined as the target topology island that needs to be processed in this failure. In addition to the periodically telemetered data, the embodiment also acquires the current voltage information of each target monitoring point, and determines the target monitoring point whose voltage information meets the ground voltage feature as the first monitoring point, that is, the voltage change of the first monitoring point is enough to represent that a ground fault has occurred. The first quantity ratio is used to determine the fault auxiliary determination result, with reference to Figure 2 When the control system acquires the fault determination processing request and performs fault determination processing, the fault auxiliary determination result can be combined to determine the fault.

[0057] In some embodiments, when the first quantity ratio is greater than a preset first risk ratio value, the fault auxiliary determination result is determined as a first risk level, the first risk level represents that a ground fault has occurred; or, when the first quantity ratio is less than or equal to the first risk ratio value and greater than a preset second risk ratio value, the fault auxiliary determination result is determined as a second risk level, the second risk level represents that a ground fault has occurred, and the risk of the ground fault represented by the second risk level is lower than the risk of the ground fault represented by the first risk level, the first risk ratio value is greater than the second risk ratio value; or, when the first quantity ratio is less than the second risk ratio value, the fault auxiliary determination result is determined as a third risk level, the third risk level represents that no ground fault has occurred.

[0058] Exemplarily, when the number of the first monitoring points is j, the total number of the monitoring points in the target topology island is i, the first number ratio is j / i, the first risk ratio is 0.7 and the second risk ratio is 0.3, when the first number ratio is greater than 0.7, the possibility of the grounding in the target topology island is high (the first risk level), and it can be determined that the grounding fault occurs in the target topology island when the fault is judged; when the first number ratio is less than 0.7 and greater than 0.3, the possibility of the grounding in the target fault point is medium (the second risk level), and further fault judgment can be performed in combination with more judgment factors; when the first number ratio is less than 0.3, the possibility of the grounding in the target fault point is low (the third risk level), and it can be determined that the grounding does not occur in the target topology island when the fault is judged.

[0059] It should be noted that, in step S13, after determining that the fault occurs, the fault power supply line in which the fault specifically occurs is determined and the target jumper switch is controlled to trip, which belongs to Figure 2 The flow of responding to the fault self-healing request and the fault self-healing processing shown in the figure belongs to the technology well known to those skilled in the art, and will not be described in detail here.

[0060] It should be noted that, after the target jumper switch trips, according to the principle of the above embodiment, if the zero sequence voltage or the three-phase voltage returns to normal, it can be confirmed that the line selection switch is selected correctly, and the fault of the small current grounding system is cut off. In order to realize the above determination, the voltage information of each target monitoring point can be telemetered again, when the voltage information no longer satisfies the grounding voltage characteristics, it can be determined that the zero sequence voltage or the three-phase voltage of the monitoring point has returned to normal, and it is determined as the second monitoring point, so as to determine the proportion of the monitoring points recovered from the fault, that is, the second number ratio. According to the second number ratio, the voltage auxiliary determination result is determined, the target FA strategy is determined in combination with the voltage auxiliary determination result, the fault self-healing processing is realized, and the accuracy of the fault self-healing is improved.

[0061] In some embodiments, when the voltage auxiliary determination result indicates that the fault power supply line is selected correctly, the target jumper switch is maintained to be disconnected according to the target FA strategy, and the power supply of the power supply lines except the fault power supply line is restored; or when the voltage auxiliary determination result indicates that the fault power supply line is selected incorrectly, the target jumper switch is reclosed and the line selection error information is reported.

[0062] Exemplarily, the FA strategy pool can include maintaining the target jumper switch to be open, reclosing the target jumper switch and prompting manual intervention. With reference to the above example, the number of the first monitoring points is i, when the number of the determined second monitoring points is k, the second number ratio is k / j, exemplarily, when the second number ratio is greater than 0.7, it is determined that the voltage auxiliary determination result is that the possibility of selecting the correct fault power supply line is high, the target jumper switch is maintained to be open, the fault section is normally isolated and the power supply of the non-fault section is restored; when the second number ratio is less than 0.7 and greater than 0.3, it is determined that the voltage auxiliary determination result is that the possibility of selecting the correct fault power supply line is medium, and it cannot be determined whether the line selection is correct, in order to ensure the accuracy of power supply, the target jumper switch can be reclosed, and the line selection error information is notified; when the second number ratio is less than 0.3, it can be determined that the line selection is incorrect, the target jumper switch is reclosed and the line selection error information is notified; when the second monitoring point cannot be detected, manual intervention can be prompted to restore power supply as soon as possible.

[0063] In addition, in an embodiment, with reference to Figure 3 The technical solutions of the embodiment also include but are not limited to the following steps:

[0064] S31, breadth-first search is performed on each power supply line, and the devices configured with zero sequence voltage or three-phase voltage in the power supply line are determined as monitoring points;

[0065] S32, when the number of the monitoring points is greater than a preset monitoring point number threshold, the monitoring points are telemetered according to a preset period;

[0066] S33, the telemetering data sent by each monitoring point is written into the shared memory through a writing process, and the telemetering data in the shared memory is saved to a telemetering database through multiple reading processes.

[0067] It should be noted that the monitoring points can be automatic devices in the topology island where the power supply side of the line selection tripping device is located, and the automatic devices are configured with zero sequence voltage or three-phase voltage. In order to improve the response efficiency and reduce the communication and storage pressure of the telemetering data, each power supply line can determine at most three monitoring points by starting from the outgoing switch and adopting breadth-first search, and the terminal offline and the test card are excluded, so as to ensure that the telemetering data provided by the monitoring points has reference value for ground fault detection.

[0068] It should be noted that after the system is online, it can be determined whether the number of the monitoring points is sufficient, for example, the monitoring point number threshold is 3, when the number of the monitoring points is less than 3, it is prompted that there is not enough monitoring point, the above method is stopped, and the number of the monitoring points is sufficient until the accuracy of the fault self-healing is ensured.

[0069] It should be noted that, to realize the cache of real-time change telemetry for use by other functional modules, the difficulty lies in meeting the performance requirements of real-time processing, and the real-time telemetry from the terminal to the interface refresh cannot exceed 3 seconds. The data volume of the telemetry message is captured from the actual running system, and the average reaches two or three thousand frames per second. In this high-performance processing scenario, the historical database cannot be directly used to save data, and the use of redis also cannot meet the performance requirements. Therefore, in the embodiment, a shared memory is used to realize the change telemetry cache and data sharing between processes.

[0070] In addition, in an embodiment, referring to Figure 4 , a data storage array with a fixed storage space is pre-allocated in the shared memory, and referring to Figure 5 , Figure 3 the step S33 further includes but is not limited to the following steps:

[0071] S51, when the telemetry data is acquired, the write position of the data storage array is determined, the write position is used to indicate the current writable position of the data storage array, and the initial position of the write position is the first address of the data storage array;

[0072] S52, the telemetry data is written into the data storage array by the write process from the write position, and the write position is updated according to the data volume written in the writing process, wherein when the write position reaches the tail address of the data storage array in the updating process, the first address of the data storage array is determined as the next updated address;

[0073] S53, the read position of the data storage array is determined, the read position is used to indicate the current readable position of the data storage array, and the initial position of the read position is the first address of the data storage array;

[0074] S54, when the distance between the write position and the read position is greater than a preset distance threshold, the telemetry data is read from the data storage array by at least one read process from the read position and saved to the telemetry database, wherein the data volume read by each read process is less than or equal to the data volume indicated by the distance threshold.

[0075] It should be noted that a fixed-size array can be used to store data in the shared memory, and the specific size of the data storage array can be allocated according to actual needs.

[0076] It should be noted that the writing process can be realized by a single write process, and the write position is updated in real time during the writing process, for example Figure 4 when the write position is represented by a pointer, the write pointer moves one byte in the direction of the tail address for each byte of data written, and Figure 4The array shown is an example, and the storage size is MACREC. When the write position reaches the tail address, it can start to overwrite the position of the head address, realize the cyclic use, and improve the space utilization. In this way, the sliding window is realized.

[0077] It should be noted that during the reading process, multiple reading processes can be implemented, each reading process obtains a segment of data, and in order to avoid using mutual exclusion to prevent read-write errors caused by overlapping of read and write positions, the embodiment ensures that there is a certain distance between the write position and the read position, for example Figure 4 As shown, when the read pointer is located at the nwidx position, the region between nwidx+1 and nwidx+0.95*MAXREC is a risky read access region, and the other regions are safe access regions. For example, when the time span of the data amount read by the read process each time is 90 seconds, the space of the risky read access region can support 90 seconds of data writing, so as to ensure that the distance between the write pointer and the read pointer is maintained to be greater than the distance threshold during the sliding process in the actual read-write process, and the read pointer does not enter the risky read access region.

[0078] In addition, in an embodiment, the telemetry data includes a voltage waveform curve, with reference to Figure 6 The method of the embodiment further includes but is not limited to the following steps:

[0079] S61, when the ground fault signal is acquired, the voltage waveform of the target monitoring point of the fault power supply line at the fault moment is acquired, the voltage waveform at the fault moment is added to the voltage waveform curve, and the updated voltage waveform curve is saved to the telemetry history curve database;

[0080] S62, when the fault information display request is acquired, the voltage waveform curve of each monitoring point is acquired from the telemetry history curve database and is displayed.

[0081] It should be noted that in addition to fault handling self-recovery, the voltage waveform at the fault moment also has a certain reference value for subsequent fault analysis. Based on the current terminal equipment, which usually has fault recording capability, with reference to Figure 2 After detecting the ground fault signal, the embodiment not only telemeters the voltage information, but also telemeters and completes the voltage waveform (i.e., the telemetry curve) at the fault moment, saves the voltage waveform to the telemetry history curve database, acquires the voltage waveform curve with the voltage waveform at the fault moment from the telemetry history curve database when the fault information display request is acquired, and displays the voltage waveform curve in combination with the voltage auxiliary determination result, thereby improving the accuracy of fault analysis.

[0082] As Figure 7 shown, Figure 7is a structural diagram of a small current grounding system fault processing device based on voltage characteristics provided by an embodiment of the application. The application further provides a small current grounding system fault processing device based on voltage characteristics, comprising:

[0083] The processor 701 can be implemented in a manner of a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute related programs to implement the technical solutions provided by the embodiments of the application.

[0084] The memory 702 can be implemented in a form of a read only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 702 can store an operating system and other application programs. When the technical solutions provided by the embodiments of the application are implemented by software or firmware, related program codes are stored in the memory 702 and are called and executed by the processor 701 to implement the small current grounding system fault processing method based on voltage characteristics of the embodiments of the application.

[0085] The input / output interface 703 is used to realize information input and output.

[0086] The communication interface 704 is used to realize communication interaction between the device and other devices. The communication can be realized in a wired manner (for example, a USB, a network cable, etc.) or in a wireless manner (for example, a mobile network, WIFI, Bluetooth, etc.).

[0087] The bus 705 is used to transmit information between various components (for example, the processor 701, the memory 702, the input / output interface 703, and the communication interface 704) of the device.

[0088] The processor 701, the memory 702, the input / output interface 703, and the communication interface 704 are connected to each other in the device through the bus 705.

[0089] The embodiments of the application further provide a small current grounding system comprising the small current grounding system fault processing device based on voltage characteristics as described above.

[0090] The embodiments of the application further provide a storage medium, which is a computer readable storage medium. The storage medium stores a computer program. When the computer program is executed by a processor, the small current grounding system fault processing method based on voltage characteristics is realized.

[0091] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory can optionally include a memory disposed remotely relative to the processor, which can be connected to the processor through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The above-described device embodiments are merely illustrative, and units described as separate components can or can not be physically separated, implemented in one place, or distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment.

[0092] Those of ordinary skill in the art can understand that all or some of the steps in the above disclosed method, the low-current grounding system can be implemented as software, firmware, hardware and appropriate combinations thereof. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, as known to those of ordinary skill in the art, communication media generally includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carriers or other transmission mechanisms, and can include any information delivery medium.

[0093] The above is a specific description of the preferred embodiment of the present application, but the present application is not limited to the above-described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A method for processing a fault of a small current grounding system based on voltage characteristics, characterized in that, The application is applied to a small current grounding system, the small current grounding system comprises a plurality of topology islands, each topology island comprises a plurality of power supply lines, each power supply line is provided with a jumper switch and at least one monitoring point, and the small current grounding system fault processing method based on voltage characteristics comprises: When a grounding fault signal of a target topology island is acquired, current voltage information of each target monitoring point of the target topology island is acquired, and the voltage information is used to indicate zero sequence voltage or three-phase voltage of the target monitoring point; The target monitoring point whose current voltage information meets a preset grounding voltage characteristic is determined as a first monitoring point, and a fault auxiliary judgment result is determined according to a first quantity ratio of the first monitoring point to the target monitoring point; When the fault auxiliary judgment result represents that a grounding fault occurs, a fault power supply line is determined, and a target jumper switch of the fault power supply line is controlled to perform tripping; After the target jumper switch is tripped, the voltage information of each target monitoring point is acquired, and the target monitoring point whose voltage information no longer meets the grounding voltage characteristic after the target jumper switch is tripped is determined as a second monitoring point, and a voltage auxiliary judgment result is determined according to a second quantity ratio of the second monitoring point to the first monitoring point; According to the voltage auxiliary judgment result, a target FA strategy is determined from a preset FA strategy pool, and the target FA strategy is executed to perform self-healing of the target topology island.

2. The method of claim 1, wherein, The fault auxiliary judgment result is determined according to the first quantity ratio of the first monitoring point to the target monitoring point, and the fault auxiliary judgment result comprises: When the first quantity ratio is greater than a preset first risk ratio value, the fault auxiliary judgment result is determined as a first risk level, and the first risk level represents that a grounding fault occurs; When the first quantity ratio is less than or equal to the first risk ratio value and greater than a preset second risk ratio value, the fault auxiliary judgment result is determined as a second risk level, the second risk level represents that a grounding fault occurs, and the risk of the grounding fault represented by the second risk level is lower than the risk of the grounding fault represented by the first risk level, and the first risk ratio value is greater than the second risk ratio value; When the first quantity ratio is less than the second risk ratio value, the fault auxiliary judgment result is determined as a third risk level, and the third risk level represents that no grounding fault occurs.

3. The method of claim 1, wherein, When the voltage information is used to indicate zero sequence voltage, the grounding voltage characteristic is used to indicate that the zero sequence voltage is greater than a first voltage threshold value, the first voltage threshold value is determined according to a rated phase voltage of the monitoring point and a preset first proportion; or when the voltage information is used to indicate three-phase voltage, the grounding voltage characteristic is used to indicate that a first phase voltage of the three-phase voltage is less than a second voltage threshold value, and second phase voltage and third phase voltage are both greater than a third voltage threshold value, the second voltage threshold value is determined according to the rated phase voltage and a preset second proportion, the third voltage threshold value is determined according to the rated phase voltage and a preset third proportion, and the third voltage threshold value is greater than the rated phase voltage.

4. The method of claim 3, wherein, The target FA strategy is determined from a preset FA strategy pool according to the voltage auxiliary determination result, and self-healing of the target topology island is performed by executing the target FA strategy, including: When the voltage auxiliary determination result indicates that the faulty power supply line is selected correctly, the power supply of the power supply line except the faulty power supply line is maintained according to the target FA strategy, and the target jump switch is kept open; Or, when the voltage auxiliary determination result indicates that the faulty power supply line is selected incorrectly, the target jump switch is closed, and a line selection error information is reported.

5. The method of claim 1, wherein, Before the ground fault signal of the target topology island is acquired, the method further includes: Each of the power supply lines is searched in breadth priority, and a device configured with zero sequence voltage or three-phase voltage in the power supply line is determined as the monitoring point; When the number of the monitoring points is greater than a preset monitoring point number threshold, the monitoring points are telemetered according to a preset period; Telemetry data sent by each of the monitoring points is written into shared memory through a write process, and the telemetry data in the shared memory is saved into a telemetry database through multiple read processes.

6. A method for processing small current ground system faults based on voltage characteristics according to claim 5, characterized in that, The shared memory is pre-allocated with a data storage array with fixed storage space, and the telemetry data sent by each of the monitoring points is written into shared memory through a write process, and the telemetry data in the shared memory is saved into a telemetry database through multiple read processes, including: When the telemetry data is acquired, a write position of the data storage array is determined, the write position is used to indicate a current writable position of the data storage array, and an initial position of the write position is a first address of the data storage array; The telemetry data is written into the data storage array through the write process from the write position as a starting point, and the write position is updated according to the amount of data written in the writing process, wherein, when the write position reaches a tail address of the data storage array in the updating process, the first address of the data storage array is determined as the next updated address; A read position of the data storage array is determined, the read position is used to indicate a current readable position of the data storage array, and an initial position of the read position is the first address of the data storage array; When the distance between the write position and the read position is greater than a preset distance threshold, the telemetry data is read from the data storage array and saved into the telemetry database through at least one read process from the read position as a starting point, wherein, the amount of data read by each read process is less than or equal to the amount of data indicated by the distance threshold.

7. A method for processing small current ground system faults based on voltage characteristics according to claim 5, characterized in that, The telemetry data includes a voltage waveform curve, and the method further includes: When the ground fault signal is acquired, a voltage waveform of the target monitoring point of the faulty power supply line at a fault time is acquired, the voltage waveform at the fault time is added to the voltage waveform curve, and the updated voltage waveform curve is saved into a telemetry history curve database; When a fault information display request is acquired, the voltage waveform curve of each monitoring point is acquired from the telemetry history curve database and displayed.

8. A low current ground system fault processing apparatus based on voltage signature, characterized by, comprising at least one control processor and a memory communicatively connected to the at least one control processor; the memory storing instructions executable by the at least one control processor, the instructions being executed by the at least one control processor to enable the at least one control processor to perform the method for processing a small current earthed system fault based on voltage characteristics according to any one of claims 1 to 7.

9. A small current grounding system, characterized by, The apparatus for processing a small current earthed system fault based on voltage characteristics according to claim 8.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer executable instructions for causing a computer to perform the method for processing a small current earthed system fault based on voltage characteristics according to any one of claims 1 to 7.

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