Power distribution line external fault point positioning method and device and computer equipment

Abstract

In the power distribution line external damage fault point positioning method and device and computer equipment provided in the application, when the power distribution line has an external damage fault, the first traveling wave arrival information feature and the first video monitoring device time of the power distribution line at a first end are recorded, the power distribution line being a power cable in a virtual video composite cable formed by the power transmission cable and the video monitoring device; the second traveling wave information arrival feature and the second video monitoring device time of the power distribution line at a second end are obtained; the first traveling wave information arrival feature and the second traveling wave information arrival feature are corrected according to the first video monitoring device time and the second video monitoring device time, to obtain an accurate time difference value of the fault traveling wave signal arriving at both ends; and the fault point is located according to the total length of the power distribution line and the accurate time difference value. In this way, the cost can be reduced and the distance measurement accuracy can be ensured without the need for additional high-precision GPS hardware devices and without being affected by the environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution lines, and particularly relates to a power distribution line external damage fault point positioning method and device and computer equipment. BACKGROUND

[0002] Cables are widely used in power distribution lines due to their advantages of not affecting the appearance of the ground, safety and reliability, and good concealment. However, urban distribution network 10kV cables are mostly in the form of a sleeve or direct burial, and the buried marks are not obvious. In addition, the city has frequent construction and brutal construction, which leads to the fact that cables are easily damaged by external forces, affecting the stability of power supply, and external damage accounts for more than half of power tripping. In recent years, video monitoring technology has become an important means of preventing external damage monitoring due to its large capacity transmission and anti-interference capability.

[0003] In recent years, the "virtual video composite cable" formed by combining power transmission cables and video monitoring equipment plays an increasingly important role in the prevention of external damage monitoring and recovery of urban power distribution lines. When the virtual video composite cable fails, that is, the power cable will generate a traveling wave propagating 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 end or both ends of the cable to calculate the distance from the fault point to one end or both ends of the virtual video composite cable, thereby positioning the fault point. The single-end distance measurement method is difficult to analyze and has poor reliability due to the waveform analysis, and the double-end distance measurement method is more accurate and has high reliability, but both ends need to have very high time synchronization accuracy, which generally uses GPS devices installed at both ends to achieve synchronization. Therefore, when the virtual video composite cable fails, the traditional double-end traveling wave distance measurement method is high in cost and is easily affected by the environment. SUMMARY

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

[0005] In a first aspect, the present application provides a power distribution line external damage fault point positioning method, which comprises:

[0006] When the power distribution line fails due to external damage, record the first traveling wave arrival information feature and the first video monitoring device time at the first end of the power distribution line, and the power distribution line is the power cable in the virtual video composite cable formed by the power transmission cable and the video monitoring device;

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

[0008] 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 an accurate time difference value of the fault traveling wave signal arriving at the first end and the second end;

[0009] According to the total length of the power distribution line and the accurate time difference value, the fault point of the power distribution line is located.

[0010] In one embodiment, 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 an accurate time difference value of the fault traveling wave signal arriving at the first end and the second end, and the step comprises:

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

[0012] According to the total length of the power distribution line, the optical refractive index, the optical total reflection critical angle, the video monitoring device time difference and the first video monitoring device time, the synchronization time of the second end is determined;

[0013] According to the second video monitoring device time and the synchronization time, the time correction error is determined;

[0014] According to the first traveling wave arrival information feature, the second traveling wave arrival information feature and the time correction error, the accurate time difference value is determined.

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

[0016]

[0017] wherein, is the synchronization time, is the first video monitoring device time, is the video monitoring device time difference, is the total length, is the optical refractive index, is the optical total reflection critical angle, is the speed of light.

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

[0019]

[0020]

[0021] wherein, is the accurate time difference value, is the second traveling wave arrival information feature, a time correction error, a first traveling wave arrival information feature, a second video monitoring device time, a synchronization time.

[0022] In one of the embodiments, the step of locating the fault point of the power distribution line according to the total length and the accurate time difference value comprises:

[0023] calculating 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 accurate time difference value, so as to determine the position of the fault point in the power distribution line according to the first fault distance and the second fault distance.

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

[0025]

[0026] wherein, the first fault distance, the total length, the accurate time difference value, the speed of light.

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

[0028]

[0029] wherein, the second fault distance, the total length, the accurate time difference value, the speed of light.

[0030] In a second aspect, the application provides a device for locating the fault point of a power distribution line, which comprises:

[0031] a first traveling wave information arrival feature acquisition module, configured to record a first traveling wave arrival information feature and a first video monitoring device time at a first end of a power distribution line when the power distribution line is faulty, the power 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 traveling wave information arrival feature acquisition module, configured to acquire a second traveling wave arrival information feature and a second video monitoring device time at a second end of the power distribution line;

[0033] The precise time difference determination module is configured 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 a precise time difference of the fault traveling wave signal arriving at the first end and the second end;

[0034] The fault point positioning module is configured to position the fault point of the power distribution line according to the total length of the power distribution line and the precise time difference.

[0035] In a third aspect, the present application provides a storage medium, the storage medium storing computer readable instructions, the computer readable instructions being executed by one or more processors to cause the one or more processors to perform the steps of the power distribution line external fault point positioning method according to any one of the above 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, the computer readable instructions being executed by the one or more processors to perform the steps of the power distribution line external fault point positioning method according to any one of the above embodiments.

[0038] From the above technical solutions, the embodiments of the present application have the following advantages:

[0039] In the power distribution line external fault point positioning method, device and computer device provided by the present application, by recording the traveling wave arrival information features at the first end and the second end of the power distribution line and the corresponding video monitoring times, the influence of environmental interference on fault positioning can be effectively reduced, thereby improving the positioning accuracy; the video monitoring device time is used to correct the traveling wave arrival information features, thereby reducing the dependence on high-precision time synchronization devices and reducing the cost; in addition, the time error caused by asynchronization is eliminated, the propagation time difference of the fault traveling wave signal in the power distribution line can be more accurately calculated, and the fault point position of the power distribution line can be more accurately determined, thereby improving the ranging accuracy; environmental changes or external factors may have an impact on GPS signals and other high-precision time synchronization methods, and the use of video monitoring device time for time correction can effectively avoid such interference and adapt to complex urban power distribution environments. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0041] Figure 1 A flowchart of a power distribution line external damage fault point positioning method provided by an embodiment of the present application is shown in the figure;

[0042] Figure 2 An example diagram of a power distribution line external damage fault point positioning method provided by an embodiment of the present application is shown in the figure;

[0043] Figure 3 A structural diagram of a power distribution line external damage fault point positioning device provided by an embodiment of the present application is shown in the figure;

[0044] Figure 4 An internal structure diagram of a computer device provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0046] The present application provides a power distribution line external damage fault point positioning method. The following embodiments take the application of the method to a computer device as an example for description. It can be understood that the computer device can be various devices with data processing functions, which can be but are not limited to a single server, a server cluster, a personal notebook computer, a desktop computer, etc. As shown in the figure, Figure 1 The method can include the following steps:

[0047] S101: When an external damage fault occurs in a power distribution line, record the first traveling wave arrival information feature of the power distribution line at a first end and the first video monitoring device time. The power distribution line is the power cable in a virtual video composite cable formed by the power transmission cable and the video monitoring device.

[0048] The virtual video composite cable is a technology combining the power transmission cable and the video monitoring device to realize the power transmission and real-time monitoring functions of the cable, and is used to improve the safety and fault detection capability of the power distribution line. The power distribution line is the power cable in the virtual video composite cable. The first end refers to one end point of the power distribution line, which is usually the starting point of monitoring or fault detection. The first traveling wave arrival information feature is an important parameter related to traveling wave propagation when an external damage fault occurs in the power distribution line, including the specific time when the traveling wave arrives at one end of the power distribution line. The first video monitoring device time refers to the time stamp recorded by the video monitoring device at the first end when an external damage fault occurs in the power distribution line, which is used to identify the moment when the traveling wave arrives at the first end of the power distribution line.

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

[0050] It can be understood that timely recording the traveling wave arrival information feature and the video monitoring device time 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, and the range of fault location can be effectively reduced.

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

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

[0053] In this step, when the external damage fault occurs in the power distribution line, the traveling wave detection device and the video monitoring device connected to the second end are used to monitor the arrival of the traveling wave signal in real time. First, the traveling wave signal at the second end is received and analyzed, and the traveling wave arrival information features such as arrival time and amplitude are extracted. At the same time, the current timestamp is recorded by the second video monitoring device.

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

[0055] The accurate time difference is the time difference of the fault traveling wave signal from one end to the other end of the power distribution line obtained by correcting the traveling wave arrival information features at the first end and the second end. This time difference takes into account the timestamp of the video monitoring device, device processing delay and other environmental factors, and provides a more accurate time difference through comparison and correction with the video monitoring device time, which is used to calculate the specific location of the fault point in the power distribution line.

[0056] It can be understood that by correcting the traveling wave arrival information feature, the time error caused by clock desynchronization or other factors can be eliminated, so that more accurate traveling wave propagation time can be obtained, and the fault location can be accurately determined.

[0057] S104: According to the total length of the power distribution line and the accurate time difference, locate the fault point of the power distribution line.

[0058] In this step, first, the total length and the accurate time difference value are used to calculate the location of the fault point. For example, the fault point location = (accurate time difference value / wave propagation speed) x total length, where the 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 accurate time difference value and the total length to calculate, the location of the fault point can be accurately determined, effectively narrowing down the scope of troubleshooting. By automatically calculating the location of the fault point, a quick response can be made when a fault occurs, and real-time positioning information can be provided.

[0060] In the above embodiment, by recording the wave arrival information characteristics 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 positioning can be effectively reduced, thereby improving the accuracy of positioning; the wave arrival information characteristics are corrected by the video monitoring device time, thereby reducing the dependence on high-precision time synchronization devices and reducing costs; in addition, the time error caused by asynchronization is eliminated, the propagation time difference value of the fault wave signal in the distribution line can be more accurately calculated, and the location of the fault point of the distribution line can be more accurately determined, thereby improving the accuracy of distance measurement; environmental changes or external factors may affect high-precision time synchronization means such as GPS signals, and using video monitoring device time for time correction can effectively avoid such interference and adapt to complex urban power distribution environments.

[0061] In one embodiment, the step of correcting the first wave arrival information characteristics and the second wave arrival information characteristics according to the first video monitoring device time and the second video monitoring device time to obtain the accurate time difference value of the fault wave signal arriving at the first end and the second end, comprises:

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

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

[0064] Determining the time correction error according to the second video monitoring device time and the synchronization time;

[0065] Determining the accurate time difference value according to the first wave arrival information characteristics, the second wave arrival information characteristics, and the time correction error.

[0066] The optical refractive index is the degree of refraction of light when propagating at the interface of two different media, and 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 is the minimum incident angle at which total reflection can occur when light is emitted from a medium with a higher optical refractive index to a medium with a lower optical refractive index, and the total reflection phenomenon ensures effective transmission of optical signals in the optical fiber. The time difference of the video monitoring device is the difference between the timestamps recorded by the first and second video monitoring devices, reflecting the time difference between the two devices when the same event occurs. The synchronization time is determined by considering the total length, optical refractive index, critical angle of total reflection, and time difference of the video monitoring device, and is the time at which the second end video monitoring device should record, which is used to ensure that the monitoring data at the first and second ends can be effectively associated when a fault occurs, 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 second video monitoring device time with the synchronization time.

[0067] Specifically, the optical refractive index can be obtained by searching for the parameters of the power distribution line, and the critical angle of total reflection can be calculated by the formula: wherein, is the medium with a higher refractive index, is the medium with a lower refractive index. By monitoring and recording the video monitoring device time at both ends of the power distribution line, the video monitoring device time difference can be calculated using timestamp recording and simple subtraction operation. The total length, optical refractive index, critical angle of total reflection, video monitoring device time difference, and first video monitoring device time are used to calculate the synchronization time at the second end, for example, synchronization time = first video monitoring device time + {total length / (speed of light / optical refractive index)} + video monitoring device time difference. By calculating the second video monitoring device time and the synchronization time, the time correction error can be obtained, for example, time correction error = second video image arrival time - synchronization time. Combined with the first traveling wave information arrival feature, the second traveling wave information arrival feature, and the time correction error, the accurate time difference value can be obtained, for example, accurate time difference value = (second traveling wave information arrival feature + time correction error) - first traveling wave information arrival feature.

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

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

[0070]

[0071] wherein, is the synchronization time, is the first video monitoring device time, is the video monitoring device time difference, is the total length, is the optical refractive index, is the optical total reflection critical angle, is the speed of light.

[0072] Specifically, represents the sum of the first end video monitoring device time and the video monitoring device time difference, i.e., the basic time when the traveling wave signal is received at the second end. Considering the physical characteristics of light propagation in the cable, represents the time required for light to propagate in a vacuum for this total length, multiplied by reflects the reduced speed of light when propagating in the power distribution line, 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 at the second end, ensuring time consistency between multiple monitoring points. The parameters of the power distribution line in the formula, such as the optical refractive index and the total reflection critical angle, can be adjusted according to the specific power distribution line and environmental conditions, improving the adaptability and practicality of the formula.

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

[0075]

[0076]

[0077] wherein, is the precise time difference value, is the second traveling wave arrival information feature, is the time correction error, is the first traveling wave arrival information feature, is the second video monitoring device time, is the synchronization time.

[0078] Specifically, reflects the time difference caused by transmission delay or other factors, by calculating the actual time difference between and and subtracting the correction error An accurate time difference value can be obtained for subsequent fault location.

[0079] In the 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 the fault point can be accurately located. The formula can effectively consider the time difference of the video monitoring device, ensure that no influencing factors are missed when calculating the time difference, and thus improve the reliability.

[0080] In one embodiment, according to the total length of the power distribution line and the accurate time difference value, the step of locating the fault point of the power distribution line comprises:

[0081] According to the total length and the accurate time difference value, the first fault distance from the fault point to the first end and the second fault distance from the fault point to the second end are calculated, so as to determine the position of the fault point in the power 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 position is the specific position where the fault occurs in the power distribution line.

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

[0084] In the embodiment, by calculating the accurate time difference value and the total length, the specific distances of the fault point to the first end and the second end can be obtained, the accurate calculation improves the accuracy of fault location, and reduces the error. The automatic 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] wherein, the first fault distance is, the total length is, the accurate time difference value is, and the light speed is.

[0088] Specifically, the formula divides the total length into two parts, i.e. the first fault distance and the second fault distance. Since the speed of light wave propagation in the cable is The propagation time of a traveling wave signal is determined by the precise time difference. Therefore, the distance from the fault point to the first end can be calculated using the above formula. This represents the theoretical distance required for the assumed traveling wave signal to propagate at both ends, calculated by subtracting... That is, the distance required for the traveling wave to propagate to the second end, from which the true 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, The second fault distance, For the total length, For precise time difference, It is the speed of light.

[0092] Specifically, the formula will include the total length It is divided into two parts: 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. This represents the theoretical distance required for a traveling wave signal to propagate from both ends, while... This represents the additional distance required for the traveling wave to reach the second end. Thus, the second fault distance can be obtained by adding these two together.

[0093] To facilitate understanding of the scheme in this application, specific examples are provided below.

[0094] like Figure 2 As shown in the figure, the solid lines represent underground power cable lines, and video surveillance equipment with GPS positioning and time synchronization is installed at both ends M and N. The dashed lines represent the GPS time synchronization connection between the video surveillance equipment at both ends.

[0095] When the power cable in a virtual video composite cable experiences an external damage fault, the traveling wave detection devices installed at both ends of the virtual video composite cable will detect a traveling wave signal. The video surveillance equipment at both ends of the virtual video composite cable is generally not damaged, meaning the GPS time synchronization between the two video surveillance devices is normal. Therefore, when the traveling wave detection device at the information input end of the virtual video composite cable detects a traveling wave signal, it marks the corresponding time t for information initiation. M (Also the arrival time t of the traveling wave signal) WM Simultaneously, the video image information feature recognition module is activated, identifying the information features at the input end of the video surveillance equipment; the remote video surveillance equipment captures the corresponding video image information features and records the information up to time t. N And mark the arrival time t of the travel wave signal.WN .

[0096] According to the order of information arriving at both ends of the virtual video composite cable, the time delay t of video image information transmission of the video monitoring equipment at both ends d , the time difference △ti of video image information arriving at both ends of the virtual video composite cable is determined respectively. The time difference △ti of 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 the video monitoring equipment is laid at both ends of the power cable line, the video image information transmission time delay t of the video monitoring equipment at both ends d can be checked or measured.

[0099] The total length l of the power cable line MN can be checked or measured in general, and the transmission speed of video image information at both ends of the video monitoring equipment and other parameters can be checked or measured together. Assuming that the optical fiber (or near-field wireless communication) is used to transmit video image information between the video monitoring equipment at both ends, the theoretical time difference value of video image information transmission at both ends of the video monitoring equipment has the following relationship:

[0100] (2)

[0101] That is:

[0102] (3)

[0103] In the formula, c is the propagation speed of light, which is 3×10 8 m / s, n1 is the refractive index of the glass core light of the optical fiber, and φ is the critical angle of total reflection of light from the core to the jacket. All of them can be obtained from the parameters of the virtual video composite cable.

[0104] From the principle of double-end traveling wave detection, as long as the accurate difference value of the arrival time of traveling waves at both ends is known, the fault point position can be accurately calculated. Based on this, we take the time of the information input end traveling wave detection device system of the virtual video composite cable as the reference time to accurately calculate the time difference of traveling wave arriving at both ends of the virtual video composite cable. The traveling wave signal arrival time t WM marked by the information input end traveling wave detection device system of the virtual video composite cable and the information representation time t M (they are essentially the same) are directly available, so according to formula (1) and formula (3), the end, that is, the information output end of the virtual video composite cable, can be synchronized. The reference time represented time t M, according to formula (1) and formula (3), the virtual video composite cable information output terminal synchronization time can be obtained :

[0105] (4)

[0106] Next, the output information arrival time t N And Correction, that is, the virtual video composite cable information output terminal and the output terminal traveling wave detection device system time synchronization, the time correction error For:

[0107] (5)

[0108] The virtual video composite cable is based on the double-end traveling wave detection principle, so the time difference of the fault traveling wave signal arriving at both ends of the virtual video composite cable is Δtw:

[0109] (6)

[0110] However, in the above formula, the time t WM And t WN Marked by the traveling wave detection device (system) at both ends of the virtual video composite cable is not synchronized or time-synchronized, and is not reliable, and needs to use the optical information time correction error in formula (5) to time-synchronize. The accurate time difference of the fault traveling wave signal arriving at both ends of the virtual video composite cable after correction is For:

[0111] (7)

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

[0113] (8)

[0114] (9)

[0115] In the formula, c is the propagation speed of light, which is 3×10 8 Meters per second.

[0116] The power distribution line external fault point device provided by the embodiment of the application is described below. The power distribution line external fault point device described below can be correspondingly referred to the power distribution line external fault point method described above. As shown in Figure 3 The application provides a power distribution line external fault point positioning device, which comprises:

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

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

[0119] The accurate time difference value determination module 203 is configured to correct the first row wave arrival information feature and the second row 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 value of the fault row wave signal arriving at the first end and the second end;

[0120] The fault point positioning module 204 is configured to position the fault point of the power distribution line according to the total length of the power distribution line and the accurate time difference value.

[0121] In an embodiment, the accurate time difference value determination module 203 comprises:

[0122] The cable parameter acquisition unit is configured to acquire the optical refractive index and the optical total reflection critical angle of the power distribution line, and determine the video monitoring device time difference between the first end and the second end;

[0123] The synchronous time determination unit is configured to determine the synchronous time of the second end according to the total length of the power distribution line, the optical refractive index, the optical total reflection critical angle, the video monitoring device time difference, and the first video monitoring device time;

[0124] The time correction error determination unit is configured to determine the time correction error according to the second video monitoring device time and the synchronous time;

[0125] The accurate time difference value determination unit is configured to determine the accurate time difference value according to the first row wave arrival information feature, the second row wave arrival information feature, and the time correction error.

[0126] In an embodiment, the formula corresponding to the synchronous time is:

[0127]

[0128] wherein, is the synchronous time, is the first video monitoring device time, is the video monitoring device time difference, is the total length, is the optical refractive index, is the optical total reflection critical angle, is the speed of light.

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

[0130]

[0131]

[0132] wherein, is the accurate time difference value, is the second wave arrival information feature, is the time correction error, is the first wave arrival information feature, is the second video monitoring device time, is the synchronization time.

[0133] In one embodiment, the fault point positioning module 204 comprises:

[0134] a fault point positioning unit, configured 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 accurate time difference value, so as to determine the position of the fault point in the power 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] wherein, is the first fault distance, is the total length, is the accurate time difference value, is the speed of light.

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

[0139]

[0140] wherein, is the second fault distance, is the total length, is the accurate time difference value, is the speed of light.

[0141] In one embodiment, the present application further provides a storage medium, wherein the storage medium stores computer readable instructions, and the computer readable instructions are executed by one or more processors to make the one or more processors execute the steps of the power distribution line external damage fault point positioning method according to any one of the above embodiments.

[0142] In one embodiment, the present application also provides a computer device having computer readable instructions stored therein, which, when executed by one or more processors, cause the one or more processors to perform the steps of the method for locating the external damage fault point of power distribution line according to any one of the above embodiments.

[0143] As shown schematically in Figure 4 , Figure 4 Fig. 6 is a schematic diagram of an internal structure of a computer device according to an embodiment of the present application. The computer device 300 can be provided as a server. As shown in Figure 4 , the computer device 300 includes a processing assembly 302, which further includes one or more processors, and a memory resource represented by a memory 301 for storing instructions, such as application programs, executable by the processing assembly 302. The application programs stored in the memory 301 can include one or more than one module each corresponding to a set of instructions. In addition, the processing assembly 302 is configured to execute the instructions to perform the method for locating the external damage fault point of power distribution line according to any one of the above embodiments.

[0144] The computer device 300 can further include a power supply assembly 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 can 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 can understand that Figure 4 the structure shown in the above embodiment is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. Specifically, the computer device can include more or less 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 the terms "first" and "second", and the like, herein do not denote any order, quantity, combination or importance, but are used to identify one element from another, and do not imply that the specific identities thereof are essential or that the identities are chronological or related in their occurrence. Also, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element. Also, "a", "an", "the", and "said" are used to refer to one or more than one (i.e., to "at least one") of the referenced elements, unless otherwise specified. A plurality also means two or more, such as 2, 3, 5, or 8, etc. "And / or" includes any and all combinations of one or more of the associated listed items.

[0147] The various embodiments described in this specification are presented by way of example, and are not intended to limit the scope of the application. Each embodiment is presented in a way that emphasizes the differences between the embodiments and the other embodiments, but the embodiments can be combined according to the needs of the user.

[0148] The above description of disclosed embodiments provides enabling disclosure sufficient for one of ordinary skill in the art to practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for locating an external fault point of a power distribution line, characterized by, The method comprises: When an external damage fault occurs in the power distribution line, record the first traveling wave arrival information feature and the first video monitoring device time of the power distribution line at a first end, the power distribution line being a power cable in a virtual video composite cable formed by a power transmission cable and a video monitoring device; Obtain the second traveling wave arrival information feature and the second video monitoring device time of the power distribution line at a second end; Obtain the optical refractive index and the optical total reflection critical angle of the power distribution line, and determine the video monitoring device time difference between the first end and the second end; determine the synchronization time of the second end according to the total length of the power distribution line, the optical refractive index, the optical total reflection critical angle, the video monitoring device time difference and the first video monitoring device time; determine the time correction error according to the second video monitoring device time and the synchronization time; determine the accurate time difference value of the fault traveling wave signal arriving at the first end and the second end according to the first traveling wave arrival information feature, the second traveling wave arrival information feature and the time correction error; According to the total length of the power distribution line and the accurate time difference value, locate the fault point of the power distribution line.

2. The method of claim 1, wherein, The formula corresponding to the synchronization time is: ； wherein, is the synchronization time, is the first video surveillance device time, is the video surveillance device time difference, is the total length, is the optical refractive index, is the optical total reflection critical angle, is the speed of light.

3. The method of claim 1, wherein, The formula corresponding to the accurate time difference value is: ； ； wherein, is the precise time difference value, is the second wave arrival information feature, is the time correction error, is the first wave arrival information feature, is the second video surveillance device time, is the synchronization time.

4. The method of claim 1, wherein, The step of locating the fault point of the power distribution line according to the total length of the power distribution line and the accurate time difference value comprises: According to the total length and the accurate time difference value, calculate the first fault distance from the fault point to the first end and the second fault distance from the fault point to the second end, so as to determine the position of the fault point in the power distribution line according to the first fault distance and the second fault distance.

5. The method of claim 4, wherein, The formula corresponding to the first fault distance is: ； wherein, is the first fault distance, is the total length, is the precise time difference value, is the speed of light.

6. The method of claim 4, wherein, The formula corresponding to the second fault distance is: ； wherein, is the second fault distance, is the total length, is the precise time difference value, is the speed of light.

7. A power distribution line external fault point locator device, comprising: The device comprises: A first traveling wave arrival information feature acquisition module is configured to record the first traveling wave arrival information feature and the first video monitoring device time of the power distribution line at a first end when an external damage fault occurs in the power distribution line, the power distribution line being 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 is configured to obtain the second traveling wave arrival information feature and the second video monitoring device time of the power distribution line at a second end; An accurate time difference value determination module is configured to obtain the optical refractive index and the optical total reflection critical angle of the power distribution line, and determine the video monitoring device time difference between the first end and the second end; determine the synchronization time of the second end according to the total length of the power distribution line, the optical refractive index, the optical total reflection critical angle, the video monitoring device time difference and the first video monitoring device time; determine the time correction error according to the second video monitoring device time and the synchronization time; determine the accurate time difference value of the fault traveling wave signal arriving at the first end and the second end according to the first traveling wave arrival information feature, the second traveling wave arrival information feature and the time correction error; A fault point positioning module is configured to position a fault point of the power distribution line according to the total length of the power distribution line and the accurate time difference value.

8. A storage medium characterized by: The storage medium has computer readable instructions stored therein, and the computer readable instructions, when executed by one or more processors, cause the one or more processors to perform the steps of the method for locating an external damage fault point of a power distribution line according to any one of claims 1 to 6.

9. A computer device, comprising: Comprise: One or more processors, and a memory; The memory has computer readable instructions stored therein, and the computer readable instructions, when executed by the one or more processors, perform the steps of the method for locating an external damage fault point of a power distribution line according to any one of claims 1 to 6.

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