Distribution line external damage fault point positioning method and device and computer equipment

Abstract

According to the distribution line external damage fault point positioning method and device and the computer equipment provided by the invention, when the distribution line has the external damage fault, the first traveling wave arrival information feature and the first video monitoring equipment time of the distribution line at the first end are recorded; the power distribution line is a power cable in a virtual video composite cable formed by a power transmission cable and video monitoring equipment; acquiring a second traveling wave information arrival feature and second video monitoring equipment time of the distribution line at a second end; according to the first video monitoring equipment time and the second video monitoring equipment time, the first traveling wave information arrival feature and the second traveling wave information arrival feature are corrected, and the accurate time difference value of the fault traveling wave signal arriving at the two ends is obtained; and positioning a fault point according to the total length of the distribution line and the accurate time difference. Therefore, on the premise that a high-precision GPS hardware device does not need to be additionally arranged and the environment influence is avoided, the cost is reduced, and the distance measurement accuracy is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of power distribution lines, and in particular to a method, device and computer equipment for locating an external fault point of a power distribution line. Background Art

[0002] Cables are widely used in power distribution lines because they do not affect the appearance of the ground, are safe, reliable and well concealed. However, most 10kV cables in urban distribution networks are buried in casing or directly, and the buried markings are not obvious. In addition, frequent and barbaric construction in cities makes cables vulnerable to external damage, affecting the stability of power supply. External damage accounts for more than half of power outages. In recent years, video surveillance technology has become an important means of anti-external damage monitoring due to its large-capacity transmission and anti-interference capabilities.

[0003] In recent years, the "virtual video composite cable" formed by combining power transmission cables and video surveillance equipment has played an increasingly important role in the monitoring and restoration of urban power distribution lines. When a virtual video composite cable fails, the power cable will generate a traveling wave at the fault point that propagates at the speed of light to the two ends of the virtual video composite cable. The traditional method uses the time value of the traveling wave reaching one or both ends of the cable to calculate the distance between the fault point and one or both ends of the virtual video composite cable, thereby locating the fault point. Among them, the single-ended ranging principle has poor reliability due to the difficulty of waveform analysis, while the dual-ended ranging is more accurate and reliable, but both ends need to have extremely high time synchronization accuracy requirements. Generally, GPS devices are installed at both ends to achieve synchronization. Therefore, when the virtual video composite cable fails, the traditional dual-ended traveling wave ranging method is costly and easily affected by the environment. Summary of the invention

[0004] The purpose of the present application is to solve at least one of the above-mentioned technical defects, especially the technical defects of the traditional two-end traveling wave ranging method in the prior art that when the virtual video composite cable fails, the cost is high and it is easily affected by the environment.

[0005] In a first aspect, the present application provides a method for locating a fault point of a distribution line, the method comprising:

[0006] When an external failure occurs in the distribution line, the first wave arrival information characteristics of the distribution line at the first end and the first video monitoring device time are recorded, the distribution line being a power cable in a virtual video composite cable formed by a power transmission cable and a video monitoring device;

[0007] Obtaining a second traveling wave arrival information feature and a second video monitoring device time at a second end of the power distribution line;

[0008] According to the time of the first video monitoring device and the time of the second video monitoring device, the first traveling wave arrival information feature and the second traveling wave arrival information feature are corrected to obtain the accurate time difference between the arrival of the fault traveling wave signal at the first end and the second end;

[0009] The fault point of the distribution line can be located based on the total length of the distribution line and the precise time difference.

[0010] In one embodiment, the step of correcting the first traveling wave arrival information feature and the second traveling wave arrival information feature according to the first video monitoring device time and the second video monitoring device time to obtain the precise time difference between the fault traveling wave signal arriving at the first end and the second end includes:

[0011] Obtaining the light refractive index and the critical angle of total light reflection of the power distribution line, and determining the time difference of the video monitoring equipment between the first end and the second end;

[0012] Determining the synchronization time of the second end according to the total length of the power distribution line, the light refractive index, the critical angle of total light reflection, the time difference of the video monitoring equipment and the time of the first video monitoring equipment;

[0013] Determine a time correction error based on the second video monitoring device time and the synchronization time;

[0014] The precise time difference is determined based on the arrival information characteristics of the first wave, the arrival information characteristics of the second wave and the time correction error.

[0015] In one embodiment, the formula corresponding to the synchronization time is:

[0016]

[0017] in, To synchronize time, The time of the first video surveillance device, is the time difference of the video surveillance equipment, is the total length, is the refractive index of light, is the critical angle of total reflection of light, The speed of light.

[0018] In one embodiment, the formula corresponding to the precise time difference is:

[0019]

[0020]

[0021] in, is the precise time difference, is the information characteristic of the second wave arrival, To correct the error for time, is the arrival information characteristic of the first wave, For the second video surveillance device time, To synchronize time.

[0022] In one embodiment, the step of locating the fault point of the distribution line according to the total length of the distribution line and the precise time difference includes:

[0023] According to the total length and the precise time difference, a first fault distance from the fault point to the first end and a second fault distance from the fault point to the second end are calculated to determine the position of the fault point in the distribution line according to the first fault distance and the second fault distance.

[0024] In one embodiment, the formula corresponding to the first fault distance is:

[0025]

[0026] in, is the first fault distance, is the total length, is the precise time difference, The speed of light.

[0027] In one embodiment, the formula corresponding to the second fault distance is:

[0028]

[0029] in, is the second fault distance, is the total length, is the precise time difference, The speed of light.

[0030] In a second aspect, the present application provides a device for locating an external fault point of a distribution line, the device comprising:

[0031] A first wave information arrival feature acquisition module is used to record the first wave arrival information feature of the distribution line at the first end and the first video monitoring device time when a distribution line fails, the distribution line being a power cable in a virtual video composite cable formed by a power transmission cable and a video monitoring device;

[0032] A second wave information arrival feature acquisition module, used to acquire the second wave arrival information feature and the second video monitoring device time of the distribution line at the second end;

[0033] An accurate time difference determination module is used to correct the first traveling wave arrival information feature and the second traveling wave arrival information feature according to the first video monitoring device time and the second video monitoring device time to obtain an accurate time difference between the fault traveling wave signal arriving at the first end and the second end;

[0034] The fault point locating module is used to locate the fault point of the distribution line according to the total length of the distribution line and the precise time difference.

[0035] In a third aspect, the present application provides a storage medium: the storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the method for locating an external fault point of a distribution line as in any of the above-mentioned embodiments.

[0036] In a fourth aspect, the present application provides a computer device, comprising: one or more processors, and a memory;

[0037] The memory stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the steps of the method for locating a fault point of a distribution line external failure in any of the above embodiments are performed.

[0038] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0039] In the method, device and computer equipment for locating the external fault point of the distribution line provided in the present application, by recording the arrival information characteristics of the traveling wave of the distribution line at the first end and the second end and the corresponding video monitoring time, the influence of environmental interference on fault location can be effectively reduced, thereby improving the accuracy of positioning; the arrival information characteristics of the traveling wave are corrected by the time of the video monitoring equipment, thereby reducing the dependence on high-precision time synchronization equipment and reducing costs; in addition, the time error caused by asynchrony is eliminated, and the propagation time difference of the fault traveling wave signal in the distribution line can be more accurately calculated, thereby more accurately determining the fault point position of the distribution line, and improving the accuracy of ranging; environmental changes or external factors may affect high-precision time synchronization means such as GPS signals, and using the time of video monitoring equipment for time correction can effectively avoid such interference and adapt to the complex urban power distribution environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 A schematic diagram of a flow chart of a method for locating a fault point of a power distribution line provided in an embodiment of the present application;

[0042] Figure 2 An example diagram of a method for locating a fault point of a power distribution line provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of a device for locating an external fault point of a distribution line provided in an embodiment of the present application;

[0044] Figure 4 A schematic diagram of the internal structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] The present application provides a method for locating a fault point of a power distribution line. The following embodiments are described by taking the method applied to a computer device as an example. It can be understood that the computer device can be any device with data processing functions, including but not limited to a single server, a server cluster, a personal laptop computer, a desktop computer, etc. Figure 1 As shown, the method may include the following steps:

[0047] S101: When an external failure occurs in a distribution line, the first wave arrival information characteristics of the distribution line at the first end and the first video surveillance device time are recorded, and the distribution line is a power cable in a virtual video composite cable formed by a power transmission cable and a video surveillance device.

[0048] Among them, the virtual video composite cable is a technology that combines power transmission cables and video surveillance equipment to achieve the power transmission and real-time monitoring functions of the cable, which is used to improve the safety and fault detection capabilities of the distribution line. The distribution line is the power cable in the virtual video composite cable. The first end refers to an end point of the distribution line, which is usually the starting point for monitoring or fault detection. The first traveling wave arrival information feature is an important parameter related to the propagation of the traveling wave when an external failure occurs in the distribution line, including the specific time when the traveling wave arrives at one end of the distribution line. The first video surveillance device time refers to the timestamp recorded by the video surveillance device at the first end when an external failure occurs in the distribution line, which is used to mark the moment when the traveling wave arrives at the first end of the distribution line.

[0049] In this step, when the traveling wave detection device of the distribution line receives the traveling wave signal, the first traveling wave arrival information feature is recorded. Similarly, when the video monitoring device of the distribution line detects the external fault signal of the distribution line, the first video monitoring device time is also recorded.

[0050] It can be understood that timely recording of the arrival information characteristics of the traveling wave and the time of the video monitoring equipment can provide accurate data support for fault location. Through accurate time recording, the propagation time of the traveling wave signal in the cable can be analyzed, effectively narrowing the scope of fault location.

[0051] S102: Acquire a second traveling wave arrival information feature and a second video monitoring device time of the distribution line at the second end.

[0052] The second end refers to the other end of the distribution line, corresponding to the first end. The second traveling wave arrival information feature is the parameters related to traveling wave propagation recorded when a distribution line fault occurs, including the specific time when the traveling wave arrives at the second end of the distribution line. The second video surveillance device time is the timestamp recorded by the video surveillance device at the second end when a distribution line fault occurs, which is used to identify the moment when the traveling wave arrives at the second end of the distribution line.

[0053] In this step, when an external fault occurs in the distribution line, the arrival of the traveling wave signal is monitored in real time by connecting the traveling wave detection device and the video monitoring device to the second end. First, the traveling wave signal at the second end is received and analyzed to extract the characteristics of the traveling wave arrival information, such as the arrival time and amplitude. At the same time, the second video monitoring device records the current timestamp.

[0054] S103: According to the first video monitoring device time and the second video monitoring device time, the first traveling wave arrival information feature and the second traveling wave arrival information feature are corrected to obtain the precise time difference between the fault traveling wave signal arriving at the first end and the second end.

[0055] The precise time difference is the time difference of the fault traveling wave signal from one end to the other end of the distribution line after correcting the arrival information characteristics of the traveling wave at the first end and the second end. The time difference takes into account the timestamp of the video surveillance device, the device processing delay and other environmental factors. By comparing and correcting with the time of the video surveillance device, a more accurate time difference is provided for calculating the specific location of the fault point in the distribution line.

[0056] It can be understood that by correcting the characteristics of the traveling wave arrival information, the time error caused by clock asynchrony or other factors can be eliminated, thereby obtaining a more accurate traveling wave propagation time, and further accurately determining the fault location.

[0057] S104: Locate the fault point of the distribution line according to the total length of the distribution line and the precise time difference.

[0058] In this step, first, the total length and the precise time difference are used to calculate the location of the fault point. For example, the fault point location = (precise time difference / traveling wave propagation speed) × total length, where the traveling wave propagation speed is usually the speed of light or the propagation speed of electrical signals in the cable. Once the location of the fault point is calculated, it is compared with the total length of the distribution line to determine the specific location of the fault relative to the distribution line.

[0059] It can be understood that by using the precise time difference and total length for calculation, the location of the fault point can be accurately determined, effectively narrowing the scope of fault investigation. By automatically calculating the location of the fault point, it is possible to respond quickly when a fault occurs and provide real-time positioning information.

[0060] In the above embodiment, by recording the arrival information characteristics of the traveling wave at the first end and the second end of the distribution line and the corresponding video monitoring time, the influence of environmental interference on fault location can be effectively reduced, thereby improving the accuracy of positioning; the arrival information characteristics of the traveling wave are corrected by the time of the video monitoring equipment, thereby reducing the dependence on high-precision time synchronization equipment and reducing costs; in addition, the time error caused by asynchrony is eliminated, and the propagation time difference of the fault traveling wave signal in the distribution line can be more accurately calculated, thereby more accurately determining the fault point location of the distribution line, thereby improving the accuracy of ranging; environmental changes or external factors may affect high-precision time synchronization means such as GPS signals, and using video monitoring equipment time for time correction can effectively avoid such interference and adapt to the complex urban power distribution environment.

[0061] In one embodiment, the step of correcting the first traveling wave arrival information feature and the second traveling wave arrival information feature according to the first video monitoring device time and the second video monitoring device time to obtain the precise time difference between the fault traveling wave signal arriving at the first end and the second end includes:

[0062] Obtaining the light refractive index and the critical angle of total light reflection of the power distribution line, and determining the time difference of the video monitoring equipment between the first end and the second end;

[0063] Determining the synchronization time of the second end according to the total length of the power distribution line, the light refractive index, the critical angle of total light reflection, the time difference of the video monitoring equipment and the time of the first video monitoring equipment;

[0064] Determine a time correction error based on the second video monitoring device time and the synchronization time;

[0065] The precise time difference is determined based on the arrival information characteristics of the first wave, the arrival information characteristics of the second wave and the time correction error.

[0066] Among them, the refractive index is the degree of refraction of light when it propagates at the interface of two different media. It is the ratio of the speed of light in a vacuum to the speed of light in the medium, which affects the propagation speed of light in the cable. The critical angle of total reflection of light is the minimum incident angle at which total reflection can occur when light is emitted from a medium with a higher refractive index to a medium with a lower refractive index. The total reflection phenomenon ensures that the optical signal is effectively transmitted in the optical fiber. The time difference of the video surveillance device is the difference between the timestamps recorded by the first video surveillance device and the second video surveillance device, reflecting the time difference between the two devices when the same event occurs. The synchronization time is the time that the second-end video surveillance device should record by comprehensively considering the total length, the refractive index of light, the critical angle of total reflection of light, and the time difference of the video surveillance device. It is used to ensure that when a fault occurs, the monitoring data of the first end and the second end can be effectively associated, helping to accurately locate the propagation time difference of the fault traveling wave signal. The time correction error is the time difference calculated by comparing the time of the second video surveillance device with the synchronization time.

[0067] Specifically, the light refractive index can be obtained by looking up the parameters of the distribution line, and the critical angle of total reflection of light can be calculated by the formula: ,in, For a medium with a higher refractive index, It is a medium with a low refractive index. By monitoring and recording the time of the video surveillance equipment at both ends of the distribution line, the time difference of the video surveillance equipment can be calculated using timestamp records and simple subtraction operations. The total length, light refractive index, critical angle of total reflection of light, time difference of the video surveillance equipment and time of the first video surveillance equipment are used for calculation to determine the synchronization time of the second end. For example, synchronization time = first video surveillance equipment time + {total length / (speed of light / light refractive index)} + video surveillance equipment time difference. By calculating the second video surveillance equipment and synchronization time, the time correction error can be obtained. For example, time correction error = second video image arrival time - synchronization time. Combining the arrival characteristics of the first wave information, the arrival characteristics of the second wave information and the time correction error, the precise time difference can be obtained. For example, precise time difference = (second wave information arrival characteristics + time correction error) - first wave information arrival characteristics.

[0068] In this embodiment, by accurately obtaining the light refractive index and the critical angle of total reflection, the propagation characteristics of the optical signal in the cable can be better understood, thereby optimizing the data transmission effect. By calculating the synchronization time of the second end, the data asynchrony problem caused by the transmission delay can be eliminated, so that the time of the video monitoring equipment and the characteristics of the arrival of the traveling wave can be coordinated with each other, thereby achieving higher accuracy. By determining the time correction error, the time measurement can be effectively adjusted and optimized, the impact of the error on the fault location can be reduced, the accuracy of the fault point location can be ensured, and the misjudgment caused by the time difference can be reduced.

[0069] In one embodiment, the formula corresponding to the synchronization time is:

[0070]

[0071] in, To synchronize time, The time of the first video surveillance device, is the time difference of the video surveillance equipment, is the total length, is the refractive index of light, is the critical angle of total reflection of light, The speed of light.

[0072] Specifically, ( ) represents the sum of the time of the first-end video surveillance device and the time difference of the video surveillance device, that is, the basic time when the second end receives the traveling wave signal. Taking into account the physical properties of light propagating in cables, represents the time required for light to travel this total distance in a vacuum, multiplied by This reflects the reduction in the speed of light as it propagates through the distribution lines. It reflects the propagation angle of light when total reflection occurs at the interface, affecting the propagation path and speed of light.

[0073] In this embodiment, the formula can accurately calculate the synchronization time of the second end, ensuring the time consistency between multiple monitoring points. The parameters of the distribution line in the formula, such as the light refractive index and the critical angle of total reflection, can be adjusted according to the specific distribution line and environmental conditions, which improves the adaptability and practicality of the formula.

[0074] In one embodiment, the formula corresponding to the precise time difference is:

[0075]

[0076]

[0077] in, is the precise time difference, is the information characteristic of the second wave arrival, To correct the error for time, is the arrival information characteristic of the first wave, For the second video surveillance device time, To synchronize time.

[0078] Specifically, Reflects the time difference caused by transmission delay or other factors, by calculating and The actual time difference between , you can get the exact time difference , used for subsequent fault location.

[0079] In this embodiment, by introducing the time correction error, the formula can more accurately reflect the actual time difference of the arrival of the traveling wave signal, and can accurately locate the fault point. The formula can effectively consider the time difference of the video monitoring equipment, ensuring that no influencing factors are omitted when calculating the time difference, thereby improving reliability.

[0080] In one embodiment, the step of locating the fault point of the distribution line according to the total length of the distribution line and the precise time difference includes:

[0081] According to the total length and the precise time difference, a first fault distance from the fault point to the first end and a second fault distance from the fault point to the second end are calculated to determine the position of the fault point in the distribution line according to the first fault distance and the second fault distance.

[0082] The first fault distance is the distance from the fault point to the first end. The second fault distance is the distance from the fault point to the second end. The fault point location is the specific location where the fault occurs in the distribution line.

[0083] Specifically, the total length of the distribution line and the previously calculated precise time difference are obtained, and then the first fault distance and the second fault distance are calculated, for example, the first fault distance = (precise time difference\2) × speed of light, the second fault distance = total length - first fault distance. The fault point location can be marked by the relationship between the first fault distance or the second fault distance and the starting point of the cable, and finally displayed on the user interface.

[0084] In this embodiment, the specific distance from the fault point to the first end and the second end can be obtained by calculating the precise time difference and the total length, and the precise calculation improves the accuracy of fault location and reduces errors. The automated calculation process greatly speeds up the response time of fault location.

[0085] In one embodiment, the formula corresponding to the first fault distance is:

[0086]

[0087] in, is the first fault distance, is the total length, is the precise time difference, The speed of light.

[0088] Specifically, the formula is calculated by dividing the total length It is divided into two parts, namely the first fault distance and the second fault distance. Since the speed of light waves propagating in the cable is , and the propagation time of the traveling wave signal is determined by the precise time difference Therefore, the distance from the fault point to the first end can be calculated by the above formula. represents the theoretical distance required for the traveling wave signal to propagate at both ends, by subtracting , that is, the distance required for the traveling wave to propagate at the second end, the actual distance from the fault point to the first end can be obtained.

[0089] In one embodiment, the formula corresponding to the second fault distance is:

[0090]

[0091] in, is the second fault distance, is the total length, is the precise time difference, The speed of light.

[0092] Specifically, the formula converts the total length It is divided into two parts, namely the first fault distance and the second fault distance. By considering the propagation of the traveling wave signal at the second end, the actual distance from the fault point to the second end can be calculated. represents the theoretical distance required for the traveling wave signal to propagate at both ends, and Then represents the additional distance required for the traveling wave to reach the second end. In this way, the second fault distance can be obtained by adding these two.

[0093] To facilitate understanding of the solution of the present application, specific examples are provided below for illustration.

[0094] like Figure 2 As shown in the figure, the solid line represents the power cable line buried underground, and video surveillance equipment with GPS positioning and timing is installed at both ends M and N. The dotted line represents the GPS timing connection of the video surveillance equipment at both ends.

[0095] When the power cable in the virtual video composite cable is damaged and fails, the traveling wave detection devices installed at both ends of the virtual video composite cable will detect the traveling wave signal. The video surveillance equipment at both ends of the virtual video composite cable is generally not damaged, that is, the GPS timing of the video surveillance equipment at both ends communicates normally. When the traveling wave detection device at the information input end of the virtual video composite cable detects the traveling wave signal, the corresponding time t when the information starts is marked. M (It is also the arrival time of the traveling wave signal t WM ), and at the same time, the video image information feature recognition module is started to identify the information features of the video surveillance device input end; the video surveillance device at the other end captures the corresponding video image information features and records the information reaching time t N , and the arrival time t of the traveling wave signalWN .

[0096] According to the order in which the information arrives at both ends of the virtual video composite cable, the video image information transmission delay t of the video surveillance equipment at both ends is d Based on the time difference △ti of the video image information arriving at both ends of the virtual video composite cable, the time difference △ti of the video image information propagation in the optical fiber link of the virtual video composite cable can be calculated by the following formula:

[0097] (1)

[0098] When video surveillance equipment is installed at both ends of the power cable line, the transmission delay of video image information of the video surveillance equipment at both ends is t d Can be checked or measured.

[0099] Total length of power cable line l MN Generally, the transmission speed of video image information between the video surveillance devices at both ends can be checked or measured. Assuming that the video image information is transmitted by optical fiber (wireless communication such as near field communication can also be used) between the video surveillance devices at both ends, the theoretical time difference between these parameters and the transmission of video image information between the video surveillance devices at both ends is Has the following relationship:

[0100] (2)

[0101] You can get:

[0102] (3)

[0103] Where c is the propagation speed of light, which is 3×10 8 Meters per second, n 1 is the refractive index of the light in the glass core of the optical fiber, and φ is the critical angle for total reflection of light from the inner core to the outer jacket, both of which can be obtained from the virtual video composite cable parameters.

[0104] According to the principle of double-end traveling wave detection, as long as the exact difference in the arrival time of the traveling waves at both ends is known, the location of the fault can be accurately calculated. Based on this, we use the time of the traveling wave detection device system at the virtual video composite cable information input end as the reference time to accurately calculate the difference in the time when the traveling wave arrives at both ends of the virtual video composite cable. The arrival time t of the traveling wave signal marked by the traveling wave detection device system at the virtual video composite cable information input end is WM and information representation time t M (Essentially, both are the same) are directly available, so according to equations (1) and (3), the end, i.e., the virtual video composite cable information output end, can be synchronized. The reference time represents the time t MAccording to equations (1) and (3), the synchronization time of the virtual video composite cable information output end can be obtained: :

[0105] (4)

[0106] Next, the output information arrives at time t N and Correct the time, that is, complete the virtual video composite cable information output end traveling wave detection device and the output end traveling wave detection device system time synchronization, time correction error for:

[0107] (5)

[0108] The virtual video composite cable is based on the principle of double-ended traveling wave detection. The time difference between the fault traveling wave signal reaching both ends of the virtual video composite cable is △tw:

[0109] (6)

[0110] However, in the above formula, the time t at which the traveling wave signal marked by the traveling wave detection device (system) at both ends of the virtual video composite cable arrives is WM and t WN It has not been synchronized or timed, so it is unreliable. It is necessary to use the optical information time correction error in formula (5) to perform time correction. The corrected fault traveling wave signal reaches the exact time difference of the two ends of the virtual video composite cable. for:

[0111] (7)

[0112] Finally, based on the principle of double-ended traveling wave ranging and formula (7), the distance from the fault point to both ends of the virtual video composite cable is calculated:

[0113] (8)

[0114] (9)

[0115] Where c is the propagation speed of light, which is 3×10 8 Meters / second.

[0116] The following describes the distribution line external fault point device provided in the embodiment of the present application. The distribution line external fault point device described below and the distribution line external fault point method described above can be referred to each other. Figure 3 As shown, the present application provides a device for locating a fault point of a distribution line, the device comprising:

[0117] The first wave arrival information feature acquisition module 201 is used to record the first wave arrival information feature of the distribution line at the first end and the first video monitoring device time when an external failure occurs in the distribution line, and the distribution line is a power cable in a virtual video composite cable formed by a power transmission cable and a video monitoring device;

[0118] The second wave arrival information feature acquisition module 202 is used to acquire the second wave arrival information feature and the second video monitoring device time of the distribution line at the second end;

[0119] The precise time difference determination module 203 is used to correct the first traveling wave arrival information feature and the second traveling wave arrival information feature according to the first video monitoring device time and the second video monitoring device time to obtain the precise time difference of the fault traveling wave signal arriving at the first end and the second end;

[0120] The fault point locating module 204 is used to locate the fault point of the distribution line according to the total length of the distribution line and the precise time difference.

[0121] In one embodiment, the precise time difference determination module 203 includes:

[0122] A cable parameter acquisition unit, used to acquire the light refractive index and the critical angle of total light reflection of the power distribution line, and to determine the time difference of the video monitoring equipment between the first end and the second end;

[0123] A synchronization time determination unit, configured to determine the synchronization time of the second end according to the total length of the power distribution line, the light refractive index, the critical angle of total light reflection, the time difference of the video monitoring equipment and the time of the first video monitoring equipment;

[0124] A time correction error determination unit, used to determine the time correction error according to the second video monitoring device time and the synchronization time;

[0125] The precise time difference determination unit determines the precise time difference according to the arrival information characteristics of the first wave, the arrival information characteristics of the second wave and the time correction error.

[0126] In one embodiment, the formula corresponding to the synchronization time is:

[0127]

[0128] in, To synchronize time, The time of the first video surveillance device, is the time difference of the video surveillance equipment, is the total length, is the refractive index of light, is the critical angle of total reflection of light, The speed of light.

[0129] In one embodiment, the formula corresponding to the precise time difference is:

[0130]

[0131]

[0132] in, is the precise time difference, is the information characteristic of the second wave arrival, To correct the error for time, is the arrival information characteristic of the first wave, For the second video surveillance device time, To synchronize time.

[0133] In one embodiment, the fault location module 204 includes:

[0134] The fault point locating unit is used to calculate a first fault distance from the fault point to the first end and a second fault distance from the fault point to the second end according to the total length and the precise time difference, so as to determine the position of the fault point in the distribution line according to the first fault distance and the second fault distance.

[0135] In one embodiment, the formula corresponding to the first fault distance is:

[0136]

[0137] in, is the first fault distance, is the total length, is the precise time difference, The speed of light.

[0138] In one embodiment, the formula corresponding to the second fault distance is:

[0139]

[0140] in, is the second fault distance, is the total length, is the precise time difference, The speed of light.

[0141] In one embodiment, the present application also provides a storage medium, which stores computer-readable instructions. When the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the method for locating the external fault point of the distribution line as described in any of the above embodiments.

[0142] In one embodiment, the present application also provides a computer device, in which computer-readable instructions are stored. When the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the method for locating the external fault point of a distribution line as described in any of the above embodiments.

[0143] Indicatively, Figure 4 As shown, Figure 4 This is a schematic diagram of the internal structure of a computer device provided in an embodiment of the present application. The computer device 300 may be provided as a server. Figure 4 The computer device 300 includes a processing component 302, which further includes one or more processors, and a memory resource represented by a memory 301, for storing instructions executable by the processing component 302, such as an application. The application stored in the memory 301 may include one or more modules, each corresponding to a set of instructions. In addition, the processing component 302 is configured to execute instructions to perform the method for locating the external fault point of the distribution line of any of the above embodiments.

[0144] The computer device 300 may further include a power supply component 303 configured to perform power management of the computer device 300, a wired or wireless network interface 304 configured to connect the computer device 300 to a network, and an input / output (I / O) interface 305. The computer device 300 may operate based on an operating system stored in the memory 301, such as Windows Server TM, Mac OS X TM, Unix TM, Linux TM, Free BSD TM, or the like.

[0145] Those skilled in the art will understand that Figure 4 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.

[0146] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. Herein, "one", "one", "said", "the" and "it" may also include plural forms, unless the context clearly indicates another way. A plurality refers to at least two cases, such as 2, 3, 5 or 8, etc. "And / or" includes any and all combinations of the relevant listed items.

[0147] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

[0148] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for locating a fault point of a power distribution line, characterized in that: The method comprises: When an external failure occurs in a distribution line, the first traveling wave arrival information feature and the first video monitoring device time of the distribution line at the first end are recorded, wherein the distribution line is a power cable in a virtual video composite cable formed by a power transmission cable and a video monitoring device; Acquire the second traveling wave arrival information feature and the second video monitoring device time of the distribution line at the second end; According to the time of the first video monitoring device and the time of the second monitoring device, the first traveling wave arrival information feature and the second traveling wave arrival information feature are corrected to obtain the precise time difference between the arrival of the fault traveling wave signal at the first end and the second end; The fault point of the distribution line is located according to the total length of the distribution line and the precise time difference.

2. The method for locating the external fault point of a distribution line according to claim 1, characterized in that: The step of correcting the first traveling wave arrival information feature and the second traveling wave arrival information feature according to the first video monitoring device time and the second video monitoring device time to obtain the accurate time difference between the fault traveling wave signal arriving at the first end and the second end includes: Obtaining a light refractive index and a critical angle of total light reflection of the power distribution line, and determining a time difference of a video surveillance device between the first end and the second end; Determining the synchronization time of the second end according to the total length of the power distribution line, the light refractive index, the critical angle of total light reflection, the time difference of the video surveillance equipment and the time of the first video surveillance equipment; Determine a time correction error according to the second video surveillance device time and the synchronization time; The precise time difference is determined according to the first traveling wave arrival information feature, the second traveling wave arrival information feature and the time correction error.

3. The method for locating the external fault point of a distribution line according to claim 2, characterized in that: The formula corresponding to the synchronization time is: in, is the synchronization time, is the time of the first video surveillance device, is the time difference of the video surveillance device, is the total length, is the refractive index of light, is the critical angle of total reflection of light, The speed of light.

4. The method for locating the external fault point of a distribution line according to claim 2, characterized in that: The formula corresponding to the precise time difference is: in, is the precise time difference, is the arrival information feature of the second traveling wave, Correct the error for said time, is the arrival information feature of the first traveling wave, The time for the second video surveillance device, is the synchronization time.

5. The method for locating the external fault point of a distribution line according to claim 1, characterized in that: The step of locating the fault point of the distribution line according to the total length of the distribution line and the precise time difference comprises: According to the total length and the precise time difference, a first fault distance from the fault point to the first end and a second fault distance from the fault point to the second end are calculated to determine the position of the fault point in the distribution line according to the first fault distance and the second fault distance.

6. The method for locating the external fault point of a distribution line according to claim 5, characterized in that: The formula corresponding to the first fault distance is: in, is the first fault distance, is the total length, is the precise time difference, The speed of light.

7. The method for locating the external fault point of a distribution line according to claim 5, characterized in that: The formula corresponding to the second fault distance is: in, is the second fault distance, is the total length, is the precise time difference, The speed of light.

8. A device for locating the external fault point of a distribution line, characterized in that: The device comprises: A first wave arrival information feature acquisition module is used to record the first wave arrival information feature and the first video monitoring device time of the distribution line at the first end when an external failure occurs in the distribution line, wherein the distribution line is a power cable in a virtual video composite cable formed by a power transmission cable and a video monitoring device; A second traveling wave information arrival feature acquisition module, used to acquire the second traveling wave arrival information feature and the second video monitoring device time of the distribution line at the second end; An accurate time difference determination module, used to correct the first traveling wave arrival information feature and the second traveling wave arrival information feature according to the first video monitoring device time and the second video monitoring device time, so as to obtain an accurate time difference between the arrival of the fault traveling wave signal at the first end and the second end; A fault point locating module is used to locate the fault point of the distribution line according to the total length of the distribution line and the precise time difference.

9. A storage medium, characterized in that: The storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the method for locating the external failure point of a distribution line as described in any one of claims 1 to 7.

10. A computer device, characterized in that: include: one or more processors, and memory; The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the method for locating a distribution line external failure point as claimed in any one of claims 1 to 7 are performed.

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