Lightning intrusion point positioning method and system based on lightning protection isolation device

Abstract

This invention discloses a method and system for locating lightning intrusion points based on isolation lightning protection devices. The method includes setting up isolation lightning protection devices at preset distances along overhead lines. Each isolation lightning protection device includes a monitoring unit, a current transformer unit, and a time synchronization unit. The method acquires the phase-to-ground current of each isolation lightning protection device and synchronously samples each phase-to-ground current. Based on the synchronous sampling results, abnormal parameters of the isolation lightning protection devices are determined to identify whether a lightning intrusion anomaly has occurred. The location of the lightning intrusion is determined by combining the anomaly occurrence time with the lightning wave propagation time. This invention expands the functionality of isolation lightning protection devices, enabling precise location of lightning intrusion points on distribution network lines; it constructs a distribution network lightning monitoring system, enabling precise location of lightning fault points on distribution network lines and supporting distribution network operation and maintenance; this invention also enables the monitoring of electrostatic induced lightning, which is beneficial for the analysis of electrostatic induced lightning and is low-cost and easy to implement.

Description

Technical Field

[0001] This invention relates to the field of lightning intrusion point location technology, and in particular to a method and system for lightning intrusion point location based on an isolation lightning protection device. Background Technology

[0002] A lightning location system is a lightning monitoring system developed for the meteorological field. It can accurately monitor lightning information, including the time of the strike and the magnitude of the current. It can also pinpoint the exact location of the strike, enabling lightning location. Currently, lightning location systems have provided a wealth of data for research on lightning activity patterns and the design of lightning protection for power transmission and transformation equipment. It is an effective means for power systems to study lightning activity and for proactive lightning protection of power grids. Internationally, to improve the accuracy of lightning monitoring and strike location, methods such as using GPS pulse-per-second (1pps) for time synchronization based on time difference-based positioning; digital signal processing technology for identifying lightning return waveforms; and radar satellite communication technology for high-speed data transmission between detection substations and data center stations are employed.

[0003] Existing lightning location systems, based on ground flash signals, can pinpoint the point where lightning energy reaches the ground. For transmission lines with simple grid structures, mathematical models show that the tower information of the main grid lines forms a sparse matrix, with sparse tower coordinates, enabling one-to-one location and thus locating lightning faults on transmission lines. However, in distribution networks, the grid structure is complex, tower geographical coordinates are dense, and lightning is primarily induced, affecting a wide area. Mathematical models show that the tower information of distribution network lines forms a dense matrix. Existing lightning location systems can only locate the area where lightning energy reaches the ground (direct strikes), and cannot accurately locate multiple distribution network lines and towers within the dense matrix area. Furthermore, induced lightning has a wide impact range, and the distance between the fault point on the distribution network line and the lightning ground flash point varies. Without sufficient lightning parameter data for the distribution network lines, it is difficult to accurately locate the lightning-damaged fault points on distribution network lines and towers.

[0004] Due to the complex structure of the distribution network and the dense geographical coordinates of the towers, lightning is mainly induced lightning. There are few existing lightning location systems that monitor lightning on distribution network lines, and existing online protection devices on the lines also lack lightning monitoring capabilities. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the aforementioned existing problems, the present invention is proposed.

[0007] Therefore, the present invention provides a method and system for locating lightning intrusion points based on an isolation lightning protection device, which can solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for locating lightning intrusion points based on an isolation lightning protection device, comprising: An isolation and lightning protection device is installed on the overhead line at a preset distance. The isolation and lightning protection device includes a monitoring unit, a current transformer unit, and a time synchronization unit. Acquire the phase-to-ground current of each of the aforementioned isolation surge protection devices, and synchronously sample the phase-to-ground current; Based on the synchronous sampling results, determine the abnormal parameters of the isolation lightning protection device and determine whether it is an abnormal lightning intrusion. By combining the time of the anomaly occurrence with the lightning wave propagation time, the location of the lightning intrusion can be determined.

[0009] As a preferred embodiment of the lightning intrusion point location method based on the isolation lightning protection device described in this invention, the preset distance setting is preset according to the user's required accuracy; the shorter the preset distance, the more accurate the lightning intrusion point location. The monitoring unit monitors the phase-to-ground current of each phase of the lightning protection device by sampling the secondary current of the current transformer unit. The time synchronization unit ensures that all isolation lightning protection devices are synchronized in time and in sampling.

[0010] As a preferred embodiment of the lightning intrusion point location method based on the isolation lightning protection device described in this invention, the step of determining whether it is a lightning intrusion anomaly includes: Record the isolation lightning protection device in The real-time three-phase ground currents for the time period are respectively , and The rated current of each phase to ground of the isolation lightning protection device is... ; If in The time period includes: And in The time period includes: This indicates that the lightning protection device detected a lightning strike event. in, , In order to be in The number of times the synchronous sampling values ​​of the three-phase ground current are all positive or all negative within a time period. In order to be in The number of times each phase is sampled within a time period.

[0011] As a preferred embodiment of the lightning intrusion point location method based on the isolation lightning protection device described in this invention, the location of the lightning intrusion includes: The isolation and lightning protection devices are numbered according to the power flow direction of the overhead line as follows: Isolation and lightning protection device 1, Isolation and lightning protection device 2, ..., Isolation and lightning protection device N, where N is the number of isolation and lightning protection devices for the overhead line. The time it takes for a lightning wave to travel from lightning protection device 1 to lightning protection device 2 is recorded as follows: The time it takes for a lightning wave to travel from isolation surge protection device N-1 to isolation surge protection device N is... The time it takes for a lightning wave to travel from lightning protection device A to lightning protection device B is... A and B are any different isolation lightning protection devices; The distance between isolation lightning protection device 1 and isolation lightning protection device 2 is... The distance between isolation lightning protection device N-1 and isolation lightning protection device N is The distance between isolation lightning protection device A and isolation lightning protection device B is A and B are any different isolation lightning protection devices; Record the moment when the lightning protection device 1 detects an abnormal lightning intrusion. The lightning protection device N detected the abnormal lightning intrusion at the following time. .

[0012] As a preferred embodiment of the lightning intrusion point location method based on the isolation lightning protection device described in this invention, the location of the lightning intrusion further includes: Isolation surge protection device C and isolation surge protection device D are adjacent isolation surge protection devices on the same overhead line. The side closest to the power source is upstream, and is isolated by lightning protection devices. The downstream side is closer to the load side, and the distance between them is... Lightning waves from the isolation lightning protection device To isolation lightning protection device The propagation time is ; When a lightning strike occurs near an overhead power line, the isolation lightning protection device exist Detecting a lightning strike at any time and isolating the lightning protection device. exist If a lightning strike event is detected at any time, all isolation lightning protection devices will upload the monitored lightning strike event information to the main station, and the main station will make a judgment based on the lightning strike event information; like negative and If the lightning strike occurs at the isolation lightning protection device... Upstream; like For positive and If the lightning strike occurs at the isolation lightning protection device... Downstream; like If the lightning strike occurs at the isolation lightning protection device... and between.

[0013] As a preferred embodiment of the lightning intrusion point location method based on the isolation lightning protection device described in this invention, the determination of whether it is a lightning intrusion anomaly further includes: When the three lightning protection devices E, G, and H detect a lightning strike, the lightning strike occurred at the lightning protection device. Between, in Lightning protection device Lightning waves were detected. Lightning protection device Lightning waves were detected. Lightning protection device Lightning surge detected, in isolation lightning protection device The time it takes for lightning waves to travel between them is In isolation lightning protection devices The time it takes for lightning waves to travel between them is Then we have: This indicates that the isolation lightning protection device detected a lightning strike event.

[0014] As a preferred embodiment of the lightning intrusion point location method based on the isolation lightning protection device described in this invention, the location of the lightning intrusion further includes: If consecutive lightning strikes occur, they are sorted according to time sequence, and then the location of the lightning intrusion is determined using a method that identifies the location. To avoid external interference from grid resonance and power frequency and frequency division on lightning strike monitoring, the synchronous sampling values ​​of the three phases to ground are set to be either all positive or all negative. Once the location of the lightning intrusion is determined, the main station will perform a damage detection test on the isolation and lightning protection devices located at the distance from the lightning intrusion location. If damage is found, the devices must be replaced promptly according to the loss rate. The isolation lightning protection device records, stores, and uploads data for each lightning strike event to the main station.

[0015] A lightning intrusion point location system based on an isolation lightning protection device, characterized in that it includes a preset module, a data acquisition module, an anomaly judgment module, and an anomaly location module. The preset module is used to set up isolation lightning protection devices on overhead lines at preset distances. The isolation lightning protection devices include a monitoring unit, a current transformer unit, and a time synchronization unit. The data acquisition module is used to acquire the phase-to-ground current of each of the isolation lightning protection devices and to synchronously sample the phase-to-ground current. An anomaly detection module is used to determine the abnormal parameters of the isolation lightning protection device based on the synchronous sampling results, and to determine whether it is a lightning intrusion anomaly. An anomaly location module is used to locate the location of lightning intrusion by combining the time of an anomaly occurrence with the propagation time of the lightning wave.

[0016] A computer device includes a memory and a processor, the memory storing a computer program, characterized in that the processor executes the computer program to implement the steps of the method described above.

[0017] A computer-readable storage medium having a computer program stored thereon, characterized in that the computer program, when executed by a processor, implements the steps of the method described above.

[0018] The beneficial effects of this invention are as follows: This invention proposes a method and system for locating lightning intrusion points based on isolation lightning protection devices. The method of this invention expands the function of isolation lightning protection devices, enabling accurate location of lightning intrusion points on distribution network lines. Based on existing lightning location systems, this invention constructs a distribution network lightning monitoring system, supplementing the actual lightning parameter data on the lines, which can improve the location accuracy, achieve accurate location of lightning fault points on distribution network lines, and support distribution network operation and maintenance. This invention realizes the monitoring of electrostatic induced lightning, which is beneficial for the analysis of electrostatic induced lightning, and is low in cost and easy to implement. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 A flowchart of a method and system for locating lightning intrusion points based on an isolation lightning protection device, provided in one embodiment of the present invention; Figure 2This is an internal structural diagram of a computer device for locating lightning intrusion points based on an isolation lightning protection device, as provided in one embodiment of the present invention. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0023] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0024] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example 1 Reference Figures 1-2 This is the first embodiment of the present invention, which provides a method and system for locating lightning intrusion points based on an isolation lightning protection device, including: Isolation and lightning protection devices are installed on overhead lines at preset distances. The isolation and lightning protection devices include a monitoring unit, a current transformer unit, and a time synchronization unit. The preset distance setting is preset according to the user's required accuracy. The shorter the preset distance, the more accurate the lightning intrusion point location. Furthermore, the monitoring unit monitors the phase-to-ground current of each phase of the isolation surge protection device by sampling the secondary current of the current transformer unit. Furthermore, the time synchronization unit ensures that all isolation lightning protection devices are synchronized in time and sampling.

[0027] It should be noted that existing lightning location systems are based on ground flash signals and can locate the point where lightning energy reaches the ground. For transmission lines with simple grid structures, mathematical modeling shows that the tower information of the main grid lines forms a sparse matrix, and its tower coordinates are sparse, enabling one-to-one location, thus completing the lightning fault location of the transmission line.

[0028] It should be noted that in distribution networks, the grid structure is complex, the geographical coordinates of poles and towers are dense, and lightning is mainly induced lightning with a wide impact range. Mathematical analysis shows that the information of distribution network lines and poles forms a dense matrix. Existing lightning location systems can only locate areas where lightning energy reaches the ground (direct strikes), and cannot accurately locate multiple distribution network lines and poles within this dense matrix area. Furthermore, induced lightning has a wide impact range, and the distance between the fault point on a distribution network line and the lightning strike point varies. Without sufficient lightning parameter data for distribution network lines, it is difficult to accurately locate the lightning-damaged fault points on distribution network lines and poles.

[0029] Acquire the phase-to-ground current of each isolation surge protection device and sample the phase-to-ground current synchronously. It should be noted that the propagation speed of lightning waves on overhead lines is between 0.7 and 0.85 times the speed of light. The propagation speed is determined by the parameters of the overhead line. However, the propagation speed of each line is a constant. Therefore, the propagation time of lightning waves between two isolated lightning protection devices can be determined through commissioning tests.

[0030] Based on the synchronous sampling results, determine the abnormal parameters of the isolation lightning protection device and determine whether it is an abnormal lightning intrusion. Among these factors, determining whether an anomaly is due to lightning intrusion includes recording the status of the isolation and lightning protection device. The real-time three-phase ground currents for the time period are respectively , and The rated current of each phase to ground of the isolation lightning protection device is... ; If in The time period includes: And in The time period includes: This indicates that the lightning protection device detected a lightning strike event. in, This shields the current generated by internal overvoltage. In order to be in The number of times the synchronous sampling values ​​of the three-phase ground current are all positive or all negative within a time period. In order to be in The number of sampling times for each phase within the time period. The current generated under internal overvoltage impulses is generally no more than 5 to 8 times the rated current.

[0031] By combining the time of the anomaly occurrence with the lightning wave propagation time, the location of the lightning intrusion can be determined.

[0032] The location of lightning intrusion includes recording the isolation lightning protection device serial numbers according to the power flow direction of the overhead line as: Isolation lightning protection device 1, Isolation lightning protection device 2, ..., Isolation lightning protection device N, where N is the number of isolation lightning protection devices for the overhead line; Furthermore, the time it takes for a lightning surge to travel from lightning protection device 1 to lightning protection device 2 is recorded as follows: The time it takes for a lightning wave to travel from isolation surge protection device N-1 to isolation surge protection device N is... The time it takes for a lightning wave to travel from lightning protection device A to lightning protection device B is... A and B are any different isolation lightning protection devices; Furthermore, the distance between isolation lightning protection device 1 and isolation lightning protection device 2 is... The distance between isolation lightning protection device N-1 and isolation lightning protection device N is The distance between isolation lightning protection device A and isolation lightning protection device B is A and B are any different isolation lightning protection devices; Furthermore, the time when the lightning protection device 1 detects an abnormal lightning intrusion is recorded as... The lightning protection device N detected the abnormal lightning intrusion at the following time. .

[0033] Furthermore, lightning protection device C and lightning protection device D are adjacent lightning protection devices on the same overhead line. The side closest to the power source is upstream, and is isolated by lightning protection devices. The downstream side is closer to the load side, and the distance between them is... Lightning waves from the isolation lightning protection device To isolation lightning protection device The propagation time is ; It should be noted that when a lightning strike occurs near an overhead line, the isolation lightning protection device... exist Detecting a lightning strike at any time and isolating the lightning protection device. exist A lightning strike event is detected at any time. All isolation lightning protection devices upload the monitored lightning strike event information to the main station, and the main station makes a judgment based on the lightning strike event information. like negative and If the lightning strike occurs at the isolation lightning protection device... Upstream; like For positive and If the lightning strike occurs at the isolation lightning protection device... Downstream; like If the lightning strike occurs at the isolation lightning protection device... and between.

[0034] Furthermore, when the three lightning protection devices E, G, and H detect a lightning strike, the lightning strike occurred at the lightning protection device. Between, in Lightning protection device Lightning waves were detected. Lightning protection device Lightning waves were detected. Lightning protection device Lightning surge detected, in isolation lightning protection device The time it takes for lightning waves to travel between them is In isolation lightning protection devices The time it takes for lightning waves to travel between them is Then we have: This indicates that the isolation lightning protection device detected a lightning strike event.

[0035] It should be noted that if a series of lightning strikes occur, they should be sorted in chronological order, and then the location of the lightning intrusion should be determined using the lightning intrusion location method. It should be noted that the synchronous sampling values ​​of the three-phase ground current are set to be either all positive or all negative to avoid external interference from grid resonance and power frequency and sub-frequency to the monitoring of lightning strike events. It should be noted that once the location of the lightning intrusion is determined, the main station will perform a damage test on the isolation and lightning protection device at the distance from the location of the lightning intrusion. If damage is found, it must be replaced in a timely manner according to the loss rate. It should be noted that the isolation lightning protection device records, stores, and uploads data for each lightning strike event to the main station.

[0036] It should be noted that the condition that the synchronous sampling values ​​of the three-phase ground current are all positive or all negative eliminates the interference of grid resonance and power frequency and sub-frequency on lightning event monitoring. This is because: if the three phases are AC quantities, the time period during which the three phases are all positive or all negative is very small and cannot meet the requirement. .

[0037] It should be noted that the isolation lightning protection device records and stores the data of each lightning strike event and uploads it to the main station for lightning strike research, which facilitates the analysis of lightning strike events afterward and improves lightning protection location research.

[0038] A lightning intrusion point location system based on an isolation lightning protection device, characterized in that it includes a preset module, a data acquisition module, an anomaly judgment module, and an anomaly location module. The preset module is used to set up isolation and lightning protection devices on overhead lines at preset distances. The isolation and lightning protection devices include a monitoring unit, a current transformer unit, and a time synchronization unit. The data acquisition module is used to acquire the phase-to-ground current of each isolation lightning protection device and to synchronously sample the phase-to-ground current. The anomaly detection module is used to determine the abnormal parameters of the isolation lightning protection device based on the synchronous sampling results, and to determine whether it is a lightning intrusion anomaly. The anomaly location module is used to locate the location of lightning intrusion by combining the time of an anomaly occurrence with the propagation time of the lightning wave.

[0039] The above-mentioned unit modules can be embedded in the processor of the computer device in hardware form or independent of it, or they can be stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of the above modules.

[0040] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 2As shown, the computer device includes a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a lightning intrusion point location method based on an isolation lightning protection device. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device casing, or an external keyboard, touchpad, or mouse.

[0041] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor: Isolation and lightning protection devices are installed on overhead lines at preset distances. The isolation and lightning protection devices include a monitoring unit, a current transformer unit, and a time synchronization unit. Acquire the phase-to-ground current of each isolation surge protection device and sample the phase-to-ground current synchronously. Based on the synchronous sampling results, determine the abnormal parameters of the isolation lightning protection device and determine whether it is an abnormal lightning intrusion. By combining the time of the anomaly occurrence with the lightning wave propagation time, the location of the lightning intrusion can be determined.

[0042] Example 2 Reference Figures 1-2 As an embodiment of the present invention, a method and system for locating lightning intrusion points based on an isolation lightning protection device are provided. To verify the beneficial effects of the present invention, a comparative experiment is conducted for scientific demonstration.

[0043] Table 1. Partial Lightning Intrusion Master Station Data Record Table

[0044] This invention expands the functionality of isolation and lightning protection devices, enabling precise location of lightning intrusion points on distribution network lines. Based on existing lightning location systems, this invention constructs a distribution network lightning monitoring system, supplementing the actual lightning parameter data on the lines, thereby improving positioning accuracy and enabling precise location of lightning fault points on distribution network lines, supporting distribution network operation and maintenance. This invention also enables the monitoring of electrostatic induced lightning, facilitating its analysis, and is low-cost and easy to implement.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0046] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0047] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0048] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0049] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1The steps of the function specified in one or more boxes.

[0050] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0051] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for locating lightning intrusion points based on an isolation lightning protection device, characterized in that: include, An isolation and lightning protection device is installed on the overhead line at a preset distance. The isolation and lightning protection device includes a monitoring unit, a current transformer unit, and a time synchronization unit. Acquire the phase-to-ground current of each of the aforementioned isolation surge protection devices, and synchronously sample the phase-to-ground current; Based on the synchronous sampling results, determine whether it is an anomaly caused by lightning intrusion; The determination of whether it is a lightning intrusion anomaly includes, Record the isolation lightning protection device in The real-time three-phase ground currents for the time period are respectively , and The rated current of each phase to ground of the isolation lightning protection device is... ; If in The time period includes: And in The time period includes: This indicates that the lightning protection device detected a lightning strike event. in, , In order to be in The number of times the synchronous sampling values ​​of the three-phase ground current are all positive or all negative within a time period. In order to be in The number of times each phase is sampled within a time period; By combining the time of the anomaly occurrence with the lightning wave propagation time, the location of the lightning intrusion can be determined.

2. The lightning intrusion point location method based on the isolation lightning protection device as described in claim 1, characterized in that: The preset distance setting is preset according to the user's required accuracy. The shorter the preset distance, the more accurate the lightning intrusion point location. The monitoring unit monitors the phase-to-ground current of each phase of the lightning protection device by sampling the secondary current of the current transformer unit. The time synchronization unit ensures that all isolation lightning protection devices are synchronized in time and in sampling.

3. The lightning intrusion point location method based on the isolation lightning protection device as described in claim 2, characterized in that: The location of the lightning intrusion includes, The isolation and lightning protection devices are numbered according to the power flow direction of the overhead line as follows: Isolation and lightning protection device 1, Isolation and lightning protection device 2, ..., Isolation and lightning protection device N, where N is the number of isolation and lightning protection devices for the overhead line. The time it takes for a lightning wave to travel from lightning protection device 1 to lightning protection device 2 is recorded as follows: The time it takes for a lightning wave to travel from isolation surge protection device N-1 to isolation surge protection device N is... The time it takes for a lightning wave to travel from lightning protection device A to lightning protection device B is... A and B are any different isolation lightning protection devices; The distance between isolation lightning protection device 1 and isolation lightning protection device 2 is... The distance between isolation lightning protection device N-1 and isolation lightning protection device N is The distance between isolation lightning protection device A and isolation lightning protection device B is A and B are any different isolation lightning protection devices; Record the moment when the lightning protection device 1 detects an abnormal lightning intrusion. The lightning protection device N detected the abnormal lightning intrusion at the following time. .

4. The lightning intrusion point location method based on the isolation lightning protection device as described in claim 3, characterized in that: The location of the lightning intrusion also includes... Isolation surge protection device C and isolation surge protection device D are adjacent isolation surge protection devices on the same overhead line. The side closest to the power source is upstream, and is isolated by lightning protection devices. The downstream side is closer to the load side, and the distance between them is... Lightning waves from the isolation lightning protection device To isolation lightning protection device The propagation time is ; When a lightning strike occurs near an overhead power line, the isolation lightning protection device exist Detecting a lightning strike at any time and isolating the lightning protection device. exist If a lightning strike event is detected at any time, all isolation lightning protection devices will upload the monitored lightning strike event information to the main station, and the main station will make a judgment based on the lightning strike event information; like negative and If the lightning strike occurs at the isolation lightning protection device... Upstream; like For positive and If the lightning strike occurs at the isolation lightning protection device... Downstream; like If the lightning strike occurs at the isolation lightning protection device... and between.

5. The lightning intrusion point location method based on the isolation lightning protection device as described in claim 4, characterized in that: The determination of whether it is a lightning intrusion anomaly also includes, When the three lightning protection devices E, G, and H detect a lightning strike, the lightning strike occurred at the lightning protection device. Between, in Lightning protection device Lightning waves were detected. Lightning protection device Lightning waves were detected. Lightning protection device Lightning surge detected, in isolation lightning protection device The time it takes for lightning waves to travel between them is In isolation lightning protection devices The time it takes for lightning waves to travel between them is Then we have: This indicates that the isolation lightning protection device detected a lightning strike event.

6. The lightning intrusion point location method based on the isolation lightning protection device as described in claim 5, characterized in that: The location of the lightning intrusion also includes... If consecutive lightning strikes occur, they are sorted according to time sequence, and then the location of the lightning intrusion is determined using a method that identifies the location. To avoid external interference from grid resonance and power frequency and frequency division on lightning strike monitoring, the synchronous sampling values ​​of the three phases to ground are set to be either all positive or all negative. Once the location of the lightning intrusion is determined, the main station will perform a damage detection test on the isolation and lightning protection devices located at the distance from the lightning intrusion location. If damage is found, the devices must be replaced promptly according to the loss rate. The isolation lightning protection device records, stores, and uploads data for each lightning strike event to the main station.

7. A lightning intrusion point location system based on an isolation lightning protection device, characterized in that: It includes a preset module, a data acquisition module, an anomaly detection module, and an anomaly location module. The preset module is used to set up isolation lightning protection devices on overhead lines at preset distances. The isolation lightning protection devices include a monitoring unit, a current transformer unit, and a time synchronization unit. The data acquisition module is used to acquire the phase-to-ground current of each of the isolation lightning protection devices and to synchronously sample the phase-to-ground current. An anomaly detection module is used to determine whether a lightning intrusion anomaly is present based on the synchronous sampling results. The determination of whether it is a lightning intrusion anomaly includes, Record the isolation lightning protection device in The real-time three-phase ground currents for the time period are respectively , and The rated current of each phase to ground of the isolation lightning protection device is... ; If in The time period includes: And in The time period includes: This indicates that the lightning protection device detected a lightning strike event. in, , In order to be in The number of times the synchronous sampling values ​​of the three-phase ground current are all positive or all negative within a time period. In order to be in The number of times each phase is sampled within a time period; An anomaly location module is used to locate the location of lightning intrusion by combining the time of an anomaly occurrence with the propagation time of the lightning wave.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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