A lightning fault location method and system

Abstract

The embodiment of the present invention discloses a lightning fault locating method and system, comprising: obtaining corresponding fault tripping data according to a lightning strike time period and a lightning strike influence radius, and sequentially determining a fault tripping line section, a lightning tripping line section, a lightning fault line, a first monitoring sensor and a second monitoring sensor on both sides of a lightning fault point, that is, by continuously narrowing the range to determine a third distance between the lightning fault point and the first monitoring sensor and / or a fourth distance between the lightning fault point and the second monitoring sensor, thereby determining the precise position of the lightning fault point, so that the lightning fault locating cost is low, the locating accuracy is high, and no manual confirmation and analysis of data is required, the degree of automation is high, it is not affected by communication, there is no use restriction, it is still applicable to complex distribution lines, it can identify distribution line information, can quickly carry out basic lightning parameter analysis and lightning fault locating, so that lightning protection management and transformation can be carried out smoothly, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of fault location, and in particular to a lightning fault location method and system. Background Art

[0002] Lightning is an important factor affecting the safe and reliable operation of the power system. It is extremely harmful to the normal operation of transmission and distribution lines, and can easily cause insulator flashover, line disconnection, and line tripping. This greatly increases the difficulty of daily operation and maintenance and fault finding, especially in mountainous areas and areas with inconvenient transportation.

[0003] At present, the lightning location system is an important means of locating and analyzing lightning faults in power transmission and distribution lines, but it has problems such as high cost, low positioning accuracy, manual confirmation and analysis of data, low degree of automation, susceptibility to communication, large usage restrictions, and inapplicability to complex distribution lines. In particular, due to the complex topological network structure, wide distribution, and large number of lines of 10kV distribution lines, the existing system cannot identify distribution line information, cannot quickly carry out basic lightning parameter analysis, lightning fault location, making lightning protection management and transformation work very difficult. Summary of the invention

[0004] Based on this, it is necessary to propose a lightning fault locating method and system to address the above problems, so that the lightning fault locating cost is low, the positioning accuracy is high, and there is no need for manual data confirmation and analysis, and the degree of automation is high.

[0005] To achieve the above object, the present invention provides a lightning fault location method in a first aspect, the method comprising:

[0006] Acquire lightning parameter information, wherein the lightning parameter information includes lightning strike time period, lightning strike impact radius, and lightning strike point location;

[0007] Acquire corresponding fault tripping data according to the lightning strike time period and the lightning strike impact radius;

[0008] Determine the pole tower information within the fault trip line section according to the fault trip data, and determine a plurality of first distances between a plurality of pole towers and the lightning strike point location according to the pole tower information and the lightning strike point location;

[0009] Determine monitoring information of each monitoring sensor in a lightning trip line section according to the plurality of the first distances and the lightning impact radius, and determine a lightning fault line according to the monitoring information;

[0010] Obtaining the time difference and amplitude difference of the electrical signals received by two adjacent monitoring sensors in the lightning fault line, and determining the steepness of the electrical traveling waves of the two adjacent monitoring sensors according to the time difference and the amplitude difference;

[0011] Determine the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point according to the electric wave steepness, obtain the second distance between the first monitoring sensor and the second monitoring sensor and the lightning fault steepness time difference between the first monitoring sensor and the second monitoring sensor in receiving the lightning mutation signal, and determine the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor according to the second distance and the lightning fault steepness time difference.

[0012] Optionally, the method further comprises:

[0013] Using the formula and formula Determine the lightning strike impact radius r;

[0014] Among them, U K is the maximum value of the induced overvoltage borne by the single-piece insulator in the transmission and distribution line, K1 is the coefficient of the induced overvoltage, I is the amplitude of the lightning current, H C is the average height of the transmission and distribution line from the ground, e is a natural constant, U N is the effective value of the rated voltage of the transmission and distribution line, and n is the number of insulators.

[0015] Optionally, determining a plurality of first distances between a plurality of poles and the lightning strike point location according to the pole tower information and the lightning strike point location includes:

[0016] Determine a plurality of the first distances d1 using the formula d1=R×arccos(cos(lat2)×cos(lat1)×cos(lng2−lng1)+sin(lat2)×sin(lat1));

[0017] Among them, R is the radius of the earth, lat1 is the latitude coordinate of the location of the lightning strike point, lng1 is the longitude coordinate of the location of the lightning strike point, lat2 is the latitude coordinate of the tower, lng2 is the longitude coordinate of the tower, arccos is the inverse cosine function, cos is the cosine function, and sin is the sine function.

[0018] Optionally, determining the lightning fault line according to the monitoring information includes:

[0019] Using the formula Determine the maximum value of the induced overvoltage U when lightning strikes the earth I ; Wherein, K1 is the coefficient of the induced overvoltage, I is the amplitude of the lightning current, ln is the natural logarithm, H Cis the average height of the power transmission and distribution line above the ground, and S is the minimum distance between the lightning strike point and the tower corresponding to the monitoring information;

[0020] If the voltage traveling wave header data in the monitoring information is greater than or equal to the maximum value of the induced overvoltage when the lightning strikes the earth, the power transmission and distribution line corresponding to the voltage traveling wave header data is determined as the lightning fault line.

[0021] Optionally, the electrical signal includes a voltage signal, and the electrical traveling wave steepness includes a voltage traveling wave steepness;

[0022] The step of determining the electric traveling wave steepness of the two adjacent monitoring sensors according to the time difference and the amplitude difference comprises:

[0023] Using the formula Determine the voltage traveling wave steepness U D ;

[0024] Among them, ΔU is the amplitude difference, and ΔT is the time difference.

[0025] Optionally, the electrical signal includes a current signal, and the electrical traveling wave steepness includes a current traveling wave steepness;

[0026] The step of determining the electric traveling wave steepness of the two adjacent monitoring sensors according to the time difference and the amplitude difference comprises:

[0027] Using the formula Determine the current traveling wave steepness I D ;

[0028] Among them, ΔI is the amplitude difference, and ΔT is the time difference.

[0029] Optionally, the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point are determined according to the electric wave steepness, including:

[0030] If the electric wave steepness is not equal to the preset threshold, two adjacent monitoring sensors corresponding to the electric wave steepness are determined as the first monitoring sensor and the second monitoring sensor.

[0031] Optionally, determining a third distance between the lightning fault point and the first monitoring sensor and / or a fourth distance between the lightning fault point and the second monitoring sensor according to the second distance and the lightning fault steepness time difference comprises:

[0032] Determine a third distance l1 between the lightning fault point and the first monitoring sensor and / or a fourth distance l2 between the lightning fault point and the second monitoring sensor using the formula Δl=l1-l2=Δt×c and the formula d2=l1+l2;

[0033] Among them, Δl is the difference between the third distance and the fourth distance, Δt is the lightning fault steepness time difference, c is the speed of light, and d2 is the second distance.

[0034] Optionally, before obtaining lightning parameter information, the method further includes:

[0035] Get historical lightning parameter information;

[0036] Determining a placement range of monitoring sensors according to the historical lightning parameter information;

[0037] The pole tower information within the placement range is obtained, and the monitoring sensor is connected to the power transmission and distribution line of the pole tower corresponding to the pole tower information within the placement range; wherein the monitoring sensor corresponds to the pole tower one by one.

[0038] To achieve the above object, the present invention provides a lightning fault location system in a second aspect, the system comprising:

[0039] A first acquisition module is used to acquire lightning parameter information, wherein the lightning parameter information includes a lightning strike time period, a lightning strike impact radius, and a lightning strike point location;

[0040] A second acquisition module is used to acquire corresponding fault tripping data according to the lightning strike time period and the lightning strike impact radius;

[0041] A distance determination module, configured to determine tower information within a fault tripping line section according to the fault tripping data, and determine a plurality of first distances between a plurality of towers and the lightning strike point location according to the tower information and the lightning strike point location;

[0042] A lightning fault line determination module, configured to determine monitoring information of each monitoring sensor within a lightning trip line section according to a plurality of the first distances and the lightning impact radius, and determine the lightning fault line according to the monitoring information;

[0043] A module for determining the steepness of a traveling wave, used to obtain the time difference and the amplitude difference of the electrical signals received by two adjacent monitoring sensors in the lightning fault line, and determine the steepness of the electrical traveling waves of the two adjacent monitoring sensors according to the time difference and the amplitude difference;

[0044] A module for determining a lightning fault point is used to determine a first monitoring sensor and a second monitoring sensor on both sides of the lightning fault point according to the electric wave steepness, obtain a second distance between the first monitoring sensor and the second monitoring sensor and a lightning fault steepness time difference between the first monitoring sensor and the second monitoring sensor for receiving a lightning mutation signal, and determine a third distance between the lightning fault point and the first monitoring sensor and / or a fourth distance between the lightning fault point and the second monitoring sensor according to the second distance and the lightning fault steepness time difference.

[0045] The embodiment of the present invention has the following beneficial effects: obtaining lightning parameter information, the lightning parameter information including the lightning strike time period, the lightning strike influence radius, and the lightning strike point location; obtaining corresponding fault tripping data according to the lightning strike time period and the lightning strike influence radius; determining the pole tower information in the fault tripping line section according to the fault tripping data, and determining multiple first distances between multiple pole towers and the lightning strike point location according to the pole tower information and the lightning strike point location; determining the monitoring information of each monitoring sensor in the lightning strike tripping line section according to the multiple first distances and the lightning strike influence radius, and determining the lightning strike fault line according to the monitoring information; obtaining the corresponding fault tripping information in the lightning strike fault line The time difference and amplitude difference of the electrical signals received by two adjacent monitoring sensors are obtained, and the electric wave steepness of the two adjacent monitoring sensors is determined according to the time difference and the amplitude difference; the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point are determined according to the electric wave steepness, the second distance between the first monitoring sensor and the second monitoring sensor and the lightning fault steepness time difference of the lightning sudden change signal received by the first monitoring sensor and the second monitoring sensor are obtained, and the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor are determined according to the second distance and the lightning fault steepness time difference. The above method determines the first monitoring sensor and the second monitoring sensor on both sides of the fault tripping line section, the lightning tripping line section, the lightning fault line, and the lightning fault point in sequence, that is, by continuously narrowing the range to determine the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor, thereby determining the precise position of the lightning fault point, so that the lightning fault positioning cost is low, the positioning accuracy is high, and there is no need for manual data confirmation and analysis. It has a high degree of automation, is not affected by communications, has no usage restrictions, is still applicable to complex distribution lines, can identify distribution line information, can quickly carry out basic lightning parameter analysis and lightning fault positioning, so that lightning protection management and transformation and other work can proceed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] in:

[0048] Figure 1 A schematic diagram of a flow chart of a lightning fault location method in an embodiment of the present application;

[0049] Figure 2 This is a structural schematic diagram of the location of the lightning strike point in the power transmission and distribution line in the embodiment of the present application;

[0050] Figure 3 This is a structural schematic diagram of a lightning fault point in a power transmission and distribution line in an embodiment of the present application;

[0051] Figure 4 This is a structural schematic diagram of the distance between a lightning fault point and a first monitoring sensor and a second monitoring sensor in a power transmission and distribution line in an embodiment of the present application;

[0052] Figure 5 This is a structural schematic diagram of a lightning fault location system in an embodiment of the present application;

[0053] Figure 6 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] See also Figure 1 , is a flow chart of a lightning fault location method in an embodiment of the present application, comprising:

[0056] Step 110: Obtain lightning parameter information, where the lightning parameter information includes a lightning strike time period, a lightning strike impact radius, and a lightning strike point location.

[0057] The lightning parameter information may also include: the amplitude of the lightning current, the number of lightning return strokes, etc. It is understandable that the lightning parameter information is obtained based on the lightning location system. Therefore, the lightning parameter information also includes other information that can be used for lightning fault location analysis.

[0058] It should be noted that the lightning strike time period includes the start time and the end time of the lightning strike, the lightning strike point location includes the longitude and latitude of the lightning strike point, and the center point of the lightning strike impact radius is the lightning strike point location. For an example, please refer to Figure 2 , is a schematic diagram of the structure of the lightning strike point position in the power transmission and distribution line in the embodiment of the present application. It can be understood that the lightning strike impact radius is the radius range of the power transmission and distribution line where lightning strike failure may occur.

[0059] Step 120: Obtain corresponding fault tripping data according to the lightning strike time period and the lightning strike impact radius.

[0060] It should be noted that within the lightning impact radius and during the lightning strike time period, if a transmission and distribution line fails (it may be a lightning fault or other faults), fault tripping data will be generated. It is understandable that the acquisition of fault tripping data can be based on the transmission and distribution line dispatching automation system within the lightning impact radius.

[0061] Step 130: determining the pole tower information within the fault tripping line section according to the fault tripping data, and determining a plurality of first distances between a plurality of pole towers and the lightning strike point location according to the pole tower information and the lightning strike point location.

[0062] The tower information includes but is not limited to: tower location, tower number, etc. It is understandable that the tower information within the fault tripping line section can be obtained based on a geographic information system or based on monitoring information from a monitoring sensor.

[0063] It should be noted that after obtaining the fault trip data, the fault trip line section corresponding to the fault trip data can be locked according to the fault trip data, and the tower information in the fault trip line section can be obtained to obtain multiple first distances between the tower and the lightning point corresponding to the tower information. It can be understood that there is a distance between each tower and the lightning point, thus constituting multiple first distances.

[0064] Step 140: Determine monitoring information of each monitoring sensor in the lightning trip line section according to the multiple first distances and the lightning impact radius, and determine the lightning fault line according to the monitoring information.

[0065] The monitoring information includes but is not limited to: monitoring sensor number, monitoring sensor location, voltage wave head data, etc.

[0066] It should be noted that if the first distance is less than the lightning influence radius, the line where the pole tower corresponding to the first distance is located will be used as the lightning tripping line, and multiple lightning tripping lines corresponding to multiple first distances will constitute a lightning tripping line section; it can be understood that if the first distance is greater than or equal to the lightning influence radius, it proves that the pole tower corresponding to the first distance is not within the range of the lightning influence radius, and therefore, it is impossible for a lightning fault to occur.

[0067] It should be further explained that the monitoring sensor can be connected to the power transmission and distribution line of the pole tower, and there is a one-to-one correspondence between the monitoring sensor and the pole tower.

[0068] Step 150: Obtain the time difference and amplitude difference of the electrical signals received by two adjacent monitoring sensors in the lightning fault line, and determine the steepness of the electrical traveling waves of the two adjacent monitoring sensors according to the time difference and the amplitude difference.

[0069] The electrical signal may include a voltage signal and / or a current signal, and correspondingly, its electrical traveling wave steepness may include a voltage traveling wave steepness and / or a current traveling wave steepness.

[0070] It should be noted that there are multiple monitoring sensors in the lightning fault line. After the lightning fault, when the electrical signal passes through each monitoring sensor, each group of two adjacent monitoring sensors has a time difference and amplitude when receiving the electrical signal. Therefore, the steepness of the electrical wave of each group of two adjacent monitoring sensors can be determined based on the time difference and amplitude difference.

[0071] In a feasible implementation, there are multiple monitoring sensors in the transmission and distribution line. Before a lightning fault, after an electrical signal is injected into the transmission and distribution line (i.e., voltage and / or current is transmitted on the transmission and distribution line), the electrical signal will pass through each monitoring sensor. Each group of two adjacent monitoring sensors has a time difference and amplitude when receiving the electrical signal. Therefore, the steepness of the electrical wave of each group of two adjacent monitoring sensors can be determined based on the time difference and amplitude difference, and the steepness of the electrical wave corresponding to each group of two adjacent monitoring sensors is used as the preset threshold corresponding to each group of two adjacent monitoring sensors.

[0072] Step 160: Determine the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point according to the electric wave steepness, obtain the second distance between the first monitoring sensor and the second monitoring sensor and the lightning fault steepness time difference when the first monitoring sensor and the second monitoring sensor receive the lightning mutation signal, and determine the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor according to the second distance and the lightning fault steepness time difference.

[0073] It should be noted that if there is no lightning fault between two adjacent monitoring sensors, the electric wave steepness of the two adjacent monitoring sensors will be equal to the preset threshold (which can be the preset threshold corresponding to each group of two adjacent monitoring sensors mentioned above). Correspondingly, if there is a lightning fault between two adjacent monitoring sensors, the electric wave steepness of the two adjacent monitoring sensors will not be equal to the preset threshold. At this time, the two adjacent monitoring sensors corresponding to the electric wave steepness not being equal to the preset threshold can be determined as the first monitoring sensor and the second monitoring sensor where the lightning fault point occurs. For example, please refer to Figure 3 , is a schematic diagram of the structure of the lightning fault point in the power transmission and distribution line in the embodiment of the present application. Further, it is only necessary to determine the third distance l1 between the lightning fault point and the first monitoring sensor and / or the fourth distance l2 between the lightning fault point and the second monitoring sensor. For example, please refer to Figure 4 , which is a structural diagram of the distance between the lightning fault point and the first monitoring sensor and the second monitoring sensor in the power transmission and distribution line in the embodiment of the present application, can determine the exact location of the lightning fault point.

[0074] It should be further explained that when a lightning fault occurs between the first monitoring sensor and the second monitoring sensor, a lightning fault point will generate a lightning mutation signal. When the first monitoring sensor and the second monitoring sensor receive the lightning mutation signal, there will be a time difference in receiving the lightning mutation signal, which is the lightning fault steepness time difference. For example, if the first monitoring sensor receives the lightning mutation signal at 13:14:50, and the second monitoring sensor receives the lightning mutation signal at 13:14:52, then the lightning fault steepness time difference is 2 seconds.

[0075] In an embodiment of the present application, by sequentially determining the fault tripping line section, the lightning tripping line section, the lightning fault line, the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point, that is, by continuously narrowing the range to determine the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor, the precise position of the lightning fault point is determined, so that the lightning fault positioning cost is low, the positioning accuracy is high, and there is no need for manual data confirmation and analysis. It has a high degree of automation, is not affected by communications, has no usage restrictions, and is still applicable to complex distribution lines (10kV distribution lines). It can identify distribution line information, can quickly carry out basic lightning parameter analysis and lightning fault positioning, so that lightning protection management and transformation and other work can proceed smoothly.

[0076] It is understandable that the present application can also report faults at lightning fault points in real time, thereby overcoming the delay caused by manual query, automating lightning fault query, positioning, and notification, reducing workload, and alleviating the burden on relevant staff, thereby improving the digitalization and intelligence level of the power system.

[0077] In a feasible implementation, the calculation of the lightning impact radius in step 110 can be performed using the formula: and formula Determine the lightning impact radius r; where U K is the maximum value of the induced overvoltage borne by the single-piece insulator in the transmission and distribution line, K1 is the coefficient of the induced overvoltage, I is the amplitude of the lightning current, H C is the average height of the transmission and distribution line from the ground, e is a natural constant, U N is the effective value of the rated voltage of the transmission and distribution line, and n is the number of insulators.

[0078] In the embodiment of the present application, the value of the lightning strike impact radius is obtained by calculating through a formula to accurately determine the radius range of the lightning strike impact, and preliminarily determine the range of the lightning fault (i.e., the fault tripping line section), so as to further determine the location of the lightning fault point, thereby determining the precise location of the lightning fault point, so that the positioning accuracy of the lightning fault location is high, and there is no need for manual data confirmation and analysis, with a high degree of automation, no impact on communication, and no usage restrictions.

[0079] In a feasible implementation, in step 130, multiple first distances between multiple towers and lightning strike locations are determined based on the tower information and the lightning strike location, including: using the formula d1=R×arccos(cos(lat2)×cos(lat1)×cos(lng2-lng1)+sin(lat2)×sin(lat1)) to determine multiple first distances d1; wherein R is the radius of the earth, lat1 is the dimensional coordinate of the lightning strike location, lng1 is the longitude coordinate of the lightning strike location, lat2 is the dimensional coordinate of the tower, lng2 is the longitude coordinate of the tower, arccos is the inverse cosine function, cos is the cosine function, and sin is the sine function.

[0080] It should be noted that each tower has latitude and longitude coordinates. Therefore, the latitude and longitude coordinates of each tower and the latitude and longitude coordinates of the lightning point can be substituted into the formula to obtain multiple first distances between multiple towers and the lightning point. For example, please refer to Figure 2 .

[0081] In the embodiment of the present application, multiple first distances corresponding to multiple towers and lightning strike points are obtained through formulas, and the lightning tripping line section where the lightning fault point occurs is further accurately located from the fault tripping line section, so as to facilitate further accurate positioning of the lightning fault point, thereby determining the exact position of the lightning fault point, so that the positioning accuracy of the lightning fault positioning is high, and there is no need for manual data confirmation and analysis, and the degree of automation is high.

[0082] In a feasible implementation, determining the lightning fault line according to the monitoring information in step 140 includes: using the formula Determine the maximum value of the induced overvoltage U when lightning strikes the earth I ; Where K1 is the coefficient of induced overvoltage, I is the amplitude of lightning current, ln is the natural logarithm, H C is the average height of the transmission and distribution line above the ground, S is the minimum distance between the lightning strike point and the tower corresponding to the monitoring information; if the voltage traveling wave head data in the monitoring information is greater than or equal to the maximum value of the induced overvoltage when lightning strikes the earth, the transmission and distribution line corresponding to the voltage traveling wave head data is determined as a lightning fault line.

[0083] Among them, there is a one-to-one correspondence between the monitoring sensors and the pole towers.

[0084] It should be noted that if there is no lightning fault in the transmission and distribution line, then the voltage traveling wave header data in all the monitoring information of this transmission and distribution line is less than the maximum value of the induced overvoltage when lightning strikes the earth; it can be understood that if there is a lightning fault in the transmission and distribution line, then the voltage traveling wave header data in the monitoring information of this transmission and distribution line must be greater than or equal to the maximum value of the induced overvoltage when lightning strikes the earth. Therefore, the transmission and distribution line corresponding to the voltage traveling wave header data can be determined as a lightning fault line.

[0085] In an embodiment of the present application, by determining the safe range value of the voltage traveling wave header data in the transmission and distribution line, that is, by determining the maximum value of the induced overvoltage when lightning strikes the earth, it is determined whether the voltage traveling wave header data in the transmission and distribution line exceeds the safe range value, and the entire lightning fault line where the lightning fault point occurs is further accurately located from the lightning trip line section, so as to facilitate further accurate positioning of the lightning fault point, thereby determining the precise position of the lightning fault point, so that the lightning fault positioning cost is low, the positioning accuracy is high, and there is no need for manual data confirmation and analysis, the degree of automation is high, it is not affected by communication, and there are no usage restrictions.

[0086] In the present application, the electrical signal of step 150 may include a voltage signal and / or a current signal, and correspondingly, its electrical traveling wave steepness may include a voltage traveling wave steepness and / or a current traveling wave steepness.

[0087] In a feasible implementation, the electrical signal includes a voltage signal, and the electrical wave steepness includes a voltage wave steepness; then the step 150 of determining the electrical wave steepness of two adjacent monitoring sensors according to the time difference and the amplitude difference includes: using the formula Determine the voltage wave steepness U D ; Where ΔU is the amplitude difference and ΔT is the time difference.

[0088] In the embodiment of the present application, the voltage wave steepness of two adjacent monitoring sensors is determined by a formula, and whether there is a lightning fault between the two adjacent monitoring sensors corresponding to the voltage wave steepness can be further determined. The two adjacent monitoring sensors where the lightning fault point occurs can be further accurately located from the lightning fault line, which facilitates further accurate positioning of the lightning fault point, thereby determining the precise position of the lightning fault point, making the lightning fault positioning cost low and the positioning accuracy high, without the need for manual data confirmation and analysis, with a high degree of automation, no impact on communication, no usage restrictions, and still applicable to complex distribution lines.

[0089] In a feasible implementation, the electrical signal includes a current signal, and the electrical wave steepness includes a current wave steepness; then the step 150 of determining the electrical wave steepness of two adjacent monitoring sensors according to the time difference and the amplitude difference includes: using the formula Determine the current wave steepness I D ; Where ΔI is the amplitude difference and ΔT is the time difference.

[0090] In the embodiment of the present application, the current wave steepness of two adjacent monitoring sensors is determined by a formula, and whether there is a lightning fault between the two adjacent monitoring sensors corresponding to the current wave steepness can be further determined. The two adjacent monitoring sensors where the lightning fault point occurs can be further accurately located from the lightning fault line, which facilitates further accurate positioning of the lightning fault point, thereby determining the precise position of the lightning fault point, making the lightning fault positioning cost low, the positioning accuracy high, and no need for manual data confirmation and analysis, with a high degree of automation, no impact on communication, no usage restrictions, and still applicable to complex distribution lines.

[0091] In a feasible implementation, determining the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point according to the electric wave steepness in step 160 includes: if the electric wave steepness is not equal to a preset threshold, determining two adjacent monitoring sensors corresponding to the electric wave steepness as the first monitoring sensor and the second monitoring sensor.

[0092] It should be noted that if there is no lightning fault between two adjacent monitoring sensors, the electric wave steepness of the two adjacent monitoring sensors will be equal to the preset threshold value. Correspondingly, if there is a lightning fault between two adjacent monitoring sensors, the electric wave steepness of the two adjacent monitoring sensors will not be equal to the preset threshold value. At this time, the two adjacent monitoring sensors corresponding to the electric wave steepness not being equal to the preset threshold value can be determined as the first monitoring sensor and the second monitoring sensor where the lightning fault point occurs. For example, please refer to Figure 3 .

[0093] In the embodiment of the present application, by determining whether a lightning fault occurs between two adjacent monitoring sensors corresponding to the steepness of the electric wave, the two adjacent monitoring sensors (the first monitoring sensor and the second monitoring sensor) where the lightning fault point occurs are further accurately located from the lightning fault line, so as to facilitate further accurate positioning of the lightning fault point, thereby determining the precise position of the lightning fault point, so that the lightning fault positioning cost is low, the positioning accuracy is high, and there is no need for manual data confirmation and analysis. It has a high degree of automation, is not affected by communications, has no usage restrictions, is still applicable to complex distribution lines, can identify distribution line information, can quickly carry out basic lightning parameter analysis and lightning fault positioning, so that lightning protection management and transformation and other work can be carried out smoothly.

[0094] In a feasible implementation, determining the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor according to the second distance and the lightning fault steepness time difference in step 160 includes: using the formula Δl=l1-l2=Δt×c and the formula d2=l1+l2 to determine the third distance l1 between the lightning fault point and the first monitoring sensor and / or the fourth distance l2 between the lightning fault point and the second monitoring sensor; wherein Δl is the difference between the third distance and the fourth distance, Δt is the lightning fault steepness time difference, c is the speed of light, and d2 is the second distance. For examples, please refer to Figure 3 and Figure 4 .

[0095] It should be noted that the transmission speed of the lightning mutation signal in step 160 may be transmitted at the speed of light.

[0096] In an embodiment of the present application, the precise position of the lightning fault point is determined by determining the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor, so that the positioning accuracy of the lightning fault location is high, and there is no need for manual data confirmation and analysis.

[0097] In a feasible implementation, before obtaining lightning parameter information in step 110, the embodiment of the present application also includes: obtaining historical lightning parameter information; determining the placement range of the monitoring sensor based on the historical lightning parameter information; obtaining the pole tower information within the placement range, and connecting the monitoring sensor to the power transmission and distribution line of the pole tower corresponding to the pole tower information within the placement range; wherein the monitoring sensor corresponds to the pole tower one-to-one.

[0098] It should be noted that historical lightning parameter information includes but is not limited to historical lightning strike time periods, historical lightning strike impact radius, historical lightning strike point locations, historical lightning current amplitudes, historical lightning return stroke times, etc. It can be understood that historical lightning parameter information is obtained based on a lightning positioning system. Therefore, historical lightning parameter information also includes other information that can be used for lightning fault positioning analysis.

[0099] In the embodiment of the present application, by determining the placement range of the monitoring sensor based on historical lightning parameter information, the cost of locating the lightning fault is reduced, and the increase in cost caused by placing too many monitoring sensors is avoided. By making the monitoring sensors correspond to the positions of the poles and towers one by one, it is convenient to accurately locate the positions of the monitoring sensors and the poles and towers. Further, it is convenient to accurately locate the position of the lightning fault point, thereby determining the precise position of the lightning fault point, so that the cost of locating the lightning fault is low and the positioning accuracy is high, and there is no need for manual data confirmation and analysis. It has a high degree of automation, is not affected by communications, has no usage restrictions, is still applicable to complex distribution lines, can identify distribution line information, can quickly carry out basic lightning parameter analysis and lightning fault location, so that lightning protection management and transformation and other work can proceed smoothly.

[0100] See also Figure 5 , is a schematic diagram of the structure of a lightning fault location system in an embodiment of the present application, the system comprising:

[0101] The first acquisition module 510 is used to acquire lightning parameter information, where the lightning parameter information includes a lightning strike time period, a lightning strike impact radius, and a lightning strike point location.

[0102] The second acquisition module 520 is used to acquire corresponding fault tripping data according to the lightning strike time period and the lightning strike impact radius.

[0103] The distance determination module 530 is used to determine the tower information within the fault tripping line section according to the fault tripping data, and determine a plurality of first distances between a plurality of towers and the lightning strike point according to the tower information and the lightning strike point position.

[0104] The lightning fault line determination module 540 is used to determine the monitoring information of each monitoring sensor in the lightning trip line section according to the multiple first distances and the lightning impact radius, and determine the lightning fault line according to the monitoring information.

[0105] The traveling wave steepness determination module 550 is used to obtain the time difference and amplitude difference of the electrical signals received by two adjacent monitoring sensors in the lightning fault line, and determine the electrical traveling wave steepness of the two adjacent monitoring sensors according to the time difference and amplitude difference.

[0106] The lightning fault point determination module 560 is used to determine the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point according to the steepness of the electric wave, obtain the second distance between the first monitoring sensor and the second monitoring sensor and the lightning fault steepness time difference when the first monitoring sensor and the second monitoring sensor receive the lightning mutation signal, and determine the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor according to the second distance and the lightning fault steepness time difference.

[0107] In the embodiment of the present application, the related contents of the first acquisition module 510, the second acquisition module 520, the distance determination module 530, the lightning fault line determination module 540, the traveling wave steepness determination module 550 and the lightning fault point determination module 560 can be referred to. Figure 1 The contents in the illustrated embodiment will not be described in detail here.

[0108] In an embodiment of the present application, by sequentially determining the fault tripping line section, the lightning tripping line section, the lightning fault line, the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point, that is, by continuously narrowing the range to determine the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor, the precise position of the lightning fault point is determined, so that the lightning fault positioning cost is low, the positioning accuracy is high, and there is no need for manual data confirmation and analysis. It has a high degree of automation, is not affected by communications, has no usage restrictions, and is still applicable to complex distribution lines (10kV distribution lines). It can identify distribution line information, can quickly carry out basic lightning parameter analysis and lightning fault positioning, so that lightning protection management and transformation and other work can proceed smoothly.

[0109] In an embodiment of the present application, a computer-readable storage medium is provided, which stores a computer program. When the computer program is executed by a processor, the processor executes the steps of a lightning fault locating method in the above embodiment.

[0110] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the steps of a lightning fault location method in the above embodiment.

[0111] Figure 6FIG. 1 shows an internal structure diagram of a computer device in an embodiment. The computer device may be a terminal, a server, or a gateway. Figure 6 As shown, the computer device includes a processor, a memory and a network interface connected through a system bus.

[0112] The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor can implement each step in the above method embodiment. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor can implement each step in the above method embodiment. Those skilled in the art can understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0113] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods.

[0114] Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0115] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A lightning fault location method, characterized in that: The method comprises: Acquire lightning parameter information, wherein the lightning parameter information includes lightning strike time period, lightning strike impact radius, and lightning strike point location; Acquire corresponding fault tripping data according to the lightning strike time period and the lightning strike impact radius; Determine the pole tower information within the fault trip line section according to the fault trip data, and determine a plurality of first distances between a plurality of pole towers and the lightning strike point location according to the pole tower information and the lightning strike point location; Determine monitoring information of each monitoring sensor in a lightning trip line section according to the plurality of the first distances and the lightning impact radius, and determine a lightning fault line according to the monitoring information; Obtaining the time difference and amplitude difference of the electrical signals received by two adjacent monitoring sensors in the lightning fault line, and determining the steepness of the electrical traveling waves of the two adjacent monitoring sensors according to the time difference and the amplitude difference; Determine a first monitoring sensor and a second monitoring sensor on both sides of a lightning fault point according to the electric traveling wave steepness, obtain a second distance between the first monitoring sensor and the second monitoring sensor and a lightning fault steepness time difference between the first monitoring sensor and the second monitoring sensor in receiving a lightning mutation signal, and determine a third distance between the lightning fault point and the first monitoring sensor and / or a fourth distance between the lightning fault point and the second monitoring sensor according to the second distance and the lightning fault steepness time difference; Wherein, determining the lightning fault line according to the monitoring information includes: If the voltage traveling wave head data in the monitoring information is greater than or equal to the maximum value of the induced overvoltage when lightning strikes the earth, the power transmission and distribution line corresponding to the voltage traveling wave head data is determined as the lightning fault line; The first monitoring sensor and the second monitoring sensor for determining the two sides of the lightning fault point according to the electric wave steepness include: If the electric wave steepness is not equal to the preset threshold, two adjacent monitoring sensors corresponding to the electric wave steepness are determined as the first monitoring sensor and the second monitoring sensor.

2. The method according to claim 1, characterized in that The method further comprises: Using the formula and formula Determine the lightning strike impact radius r; Among them, U K is the maximum value of the induced overvoltage borne by the single-piece insulator in the transmission and distribution line, K1 is the coefficient of the induced overvoltage, I is the amplitude of the lightning current, H C is the average height of the transmission and distribution line from the ground, e is a natural constant, U N is the effective value of the rated voltage of the transmission and distribution line, and n is the number of insulators.

3. The method according to claim 1, characterized in that The determining a plurality of first distances between a plurality of poles and the lightning strike point location according to the pole tower information and the lightning strike point location comprises: Determine a plurality of the first distances d1 using the formula d1=R×arccos(cos(lat2)×cos(lat1)×cos(lng2−lng1)+sin(lat2)×sin(lat1)); Among them, R is the radius of the earth, lat1 is the latitude coordinate of the location of the lightning strike point, lng1 is the longitude coordinate of the location of the lightning strike point, lat2 is the latitude coordinate of the tower, lng2 is the longitude coordinate of the tower, arccos is the inverse cosine function, cos is the cosine function, and sin is the sine function.

4. The method according to claim 1, characterized in that: Get the maximum value of the induced overvoltage when lightning strikes the earth, including: Using the formula Determine the maximum value of the induced overvoltage U when lightning strikes the earth I ; Wherein, K1 is the coefficient of the induced overvoltage, I is the amplitude of the lightning current, ln is the natural logarithm, H C is the average height of the transmission and distribution line above the ground, and S is the minimum distance between the lightning strike point and the tower corresponding to the monitoring information.

5. The method according to claim 1, characterized in that The electrical signal includes a voltage signal, and the electrical traveling wave steepness includes a voltage traveling wave steepness; The step of determining the electric traveling wave steepness of the two adjacent monitoring sensors according to the time difference and the amplitude difference comprises: Using the formula Determine the voltage traveling wave steepness U D ; Among them, ΔU is the amplitude difference, and ΔT is the time difference.

6. The method according to claim 1, characterized in that The electrical signal includes a current signal, and the electrical traveling wave steepness includes a current traveling wave steepness; The step of determining the electric traveling wave steepness of the two adjacent monitoring sensors according to the time difference and the amplitude difference comprises: Using the formula Determine the current traveling wave steepness I D ; Among them, ΔI is the amplitude difference, and ΔT is the time difference.

7. The method according to claim 1, characterized in that The determining, according to the second distance and the lightning fault steepness time difference, the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor comprises: Determine a third distance l1 between the lightning fault point and the first monitoring sensor and / or a fourth distance l2 between the lightning fault point and the second monitoring sensor using the formula Δl=l1-l2=Δt×c and the formula d2=l1+l2; Among them, Δl is the difference between the third distance and the fourth distance, Δt is the lightning fault steepness time difference, c is the speed of light, and d2 is the second distance.

8. The method according to claim 1, characterized in that Before obtaining the lightning parameter information, the method further includes: Get historical lightning parameter information; Determining a placement range of monitoring sensors according to the historical lightning parameter information; The pole tower information within the placement range is obtained, and the monitoring sensor is connected to the power transmission and distribution line of the pole tower corresponding to the pole tower information within the placement range; wherein the monitoring sensor corresponds to the pole tower one by one.

9. A lightning fault location system, characterized in that: The system comprises: A first acquisition module is used to acquire lightning parameter information, wherein the lightning parameter information includes a lightning strike time period, a lightning strike impact radius, and a lightning strike point location; A second acquisition module is used to acquire corresponding fault tripping data according to the lightning strike time period and the lightning strike impact radius; A distance determination module, configured to determine the pole tower information within the fault tripping line section according to the fault tripping data, and determine a plurality of first distances between a plurality of pole towers and the lightning strike point location according to the pole tower information and the lightning strike point location; A lightning fault line determination module, configured to determine monitoring information of each monitoring sensor within a lightning trip line section according to a plurality of the first distances and the lightning impact radius, and determine the lightning fault line according to the monitoring information; A module for determining the steepness of a traveling wave, used to obtain the time difference and amplitude difference of the electrical signals received by two adjacent monitoring sensors in the lightning fault line, and determine the steepness of the electrical traveling waves of the two adjacent monitoring sensors according to the time difference and the amplitude difference; a lightning fault point determination module, configured to determine the first monitoring sensor and the second monitoring sensor on both sides of the lightning fault point according to the electric wave steepness, obtain the second distance between the first monitoring sensor and the second monitoring sensor and the lightning fault steepness time difference between the first monitoring sensor and the second monitoring sensor in receiving the lightning sudden change signal, and determine the third distance between the lightning fault point and the first monitoring sensor and / or the fourth distance between the lightning fault point and the second monitoring sensor according to the second distance and the lightning fault steepness time difference; Wherein, determining the lightning fault line according to the monitoring information includes: If the voltage traveling wave head data in the monitoring information is greater than or equal to the maximum value of the induced overvoltage when lightning strikes the earth, the power transmission and distribution line corresponding to the voltage traveling wave head data is determined as the lightning fault line; The first monitoring sensor and the second monitoring sensor for determining the two sides of the lightning fault point according to the electric wave steepness include: If the electric wave steepness is not equal to the preset threshold, two adjacent monitoring sensors corresponding to the electric wave steepness are determined as the first monitoring sensor and the second monitoring sensor.

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