Hybrid line fault location method and device based on traveling wave location

Abstract

The invention relates to a hybrid line fault location method and device based on traveling wave location, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring the total length of a target power line in a power topological structure; calculating to obtain a theoretical wave velocity rated value of each cable section; according to a preset time interval, obtaining a temperature measurement result, calculating to obtain a theoretical wave velocity real-time value of each cable section, carrying out normalization processing on the theoretical wave velocity real-time value of each cable section, and converting the theoretical wave velocity real-time value into a wave velocity of an equivalent overhead line section; under the condition that a line fault occurs, the wave head signal time difference of a fault wave is obtained through the two traveling wave measurement terminals; and determining a theoretical fault position according to the wave velocity and the wave head signal time difference of the equivalent overhead line section. By adopting the method, the fault point measurement accuracy of the mixed line of the overhead line and the cable can be improved under the condition of controlling the cost.

Description

Technical Field

[0001] The present application relates to the technical field of traveling wave ranging, and in particular to a hybrid line fault ranging method, apparatus, computer equipment, computer-readable storage medium, and computer program product based on traveling wave ranging. Background Art

[0002] Traveling wave ranging uses the electromagnetic traveling wave signals generated when a fault occurs to determine the fault location. When a line fault occurs, reflected and attenuated waves are generated at the fault point. The ranging system measures the time it takes for the traveling wave to travel from the fault point to the measuring device (such as a protection relay) and, combined with the wave velocity, calculates the fault distance.

[0003] A major problem with the current application of dual-end traveling wave ranging technology for overhead and cable lines is the large error in traveling wave ranging due to the different wave velocities of the two media. Traditionally, traveling wave measurement terminals are installed at both ends of the overhead line and the cable, and the arriving traveling wave signals are measured simultaneously. The collected signal information is used to calculate the location of the fault point. However, in hybrid overhead and cable lines, as the complexity of the lines increases, more traveling wave measurement terminals need to be deployed, which results in high equipment costs.

[0004] Therefore, there is an urgent need for a hybrid line fault ranging method, device, computer equipment, computer-readable storage medium and computer program product based on traveling wave ranging, which can improve the fault point measurement accuracy of a hybrid line of overhead lines and cables while controlling costs. Summary of the Invention

[0005] Based on this, it is necessary to provide a hybrid line fault ranging method, device, computer equipment, computer-readable storage medium and computer program product based on traveling wave ranging, which can improve the fault point measurement accuracy of hybrid lines of overhead lines and cables while controlling costs in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a hybrid line fault location method based on traveling wave ranging, comprising:

[0007] Obtaining a total length of a target power line in a power topology structure, wherein the target power line includes at least one cable segment and an overhead line segment;

[0008] The theoretical wave velocity rating of each cable segment is calculated based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment;

[0009] Obtaining temperature measurement results at preset time intervals, and calculating a theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value, normalizing the theoretical wave velocity real-time value of each cable segment and converting it into a wave velocity of an equivalent overhead line segment;

[0010] In the event of a line fault, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave head signals of the fault wave respectively, and the time difference between the wave head signals of the two fault waves is calculated;

[0011] determining a theoretical fault location based on the wave velocity of the equivalent overhead line section and the wave front signal time difference;

[0012] An actual fault location is obtained, and the wave velocity of the equivalent overhead line section is corrected according to the actual fault location and the theoretical fault location.

[0013] In one embodiment, obtaining the temperature measurement results at preset time intervals and calculating the theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value includes:

[0014] determining a current temperature from the temperature measurement result, and calculating a temperature difference between the current temperature and a reference temperature;

[0015] Calculating a first product result of the temperature difference and a preset temperature coefficient;

[0016] The theoretical wave velocity real-time value of each cable segment is calculated based on the first product result and the theoretical wave velocity rated value.

[0017] In one embodiment, the calculation formula of the theoretical wave speed rating includes:

[0018]

[0019] Among them, V n0 is the theoretical wave velocity rating, α n is the conductor material parameter of the current cable segment, C is the speed of light, μ n is the relative dielectric constant of the current cable segment, ε n is the relative permeability of the current cable segment.

[0020] In one embodiment, determining the theoretical fault location based on the wave velocity of the equivalent overhead line section and the wave head signal time difference includes:

[0021] Obtaining a second product result between the wave velocity of the equivalent overhead line section and the wave front signal time difference;

[0022] A theoretical fault location is determined according to the second multiplication result and the total length of the target power line.

[0023] In one embodiment, the obtaining of the actual fault location and correcting the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location include:

[0024] Determine the reference wave velocity based on the actual fault location and the theoretical fault location;

[0025] Obtaining a wave velocity difference between the wave velocity of the equivalent overhead line section and the reference wave velocity, and using the difference as a wave velocity correction value;

[0026] According to a preset correction weight coefficient, based on the wave velocity of the equivalent overhead line section and the wave velocity correction value, a corrected wave velocity of the equivalent overhead line section is obtained.

[0027] In one embodiment, after obtaining the actual fault location and correcting the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location, the method further includes:

[0028] Obtain the relative relationship between the actual fault location and the theoretical fault location;

[0029] If the actual fault location is on the left side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the right of the cable segment where the theoretical fault location is located. If the actual fault location is on the right side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the left of the cable segment where the theoretical fault location is located.

[0030] In a second aspect, the present application further provides a hybrid line fault ranging device based on traveling wave ranging, comprising:

[0031] a line length determination module, which obtains a total length of a target power line in a power topology structure, wherein the target power line includes at least one cable segment and an overhead line segment;

[0032] A calculation module is used to calculate the theoretical wave velocity rating of each cable segment based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment;

[0033] The calculation module is further configured to obtain temperature measurement results at preset time intervals, and calculate a real-time theoretical wave velocity value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value;

[0034] Normalization processing module, used to normalize the real-time value of the theoretical wave velocity of each cable segment and convert it into the wave velocity of the equivalent overhead line segment;

[0035] The calculation module is further configured to obtain the wave head signals of the fault wave through two traveling wave measurement terminals located at both ends of the target power line in the event of a line fault, and calculate the wave head signal time difference between the wave head signals of the two fault waves;

[0036] a fault location determination module, configured to determine a theoretical fault location based on the wave velocity of the equivalent overhead line section and the wave front signal time difference;

[0037] The wave velocity correction module is used to obtain the actual fault location and correct the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location.

[0038] In a third aspect, the present application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0039] Obtaining a total length of a target power line in a power topology structure, wherein the target power line includes at least one cable segment and an overhead line segment;

[0040] The theoretical wave velocity rating of each cable segment is calculated based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment;

[0041] Obtaining temperature measurement results at preset time intervals, and calculating a theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value, normalizing the theoretical wave velocity real-time value of each cable segment and converting it into a wave velocity of an equivalent overhead line segment;

[0042] In the event of a line fault, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave head signals of the fault wave respectively, and the time difference between the wave head signals of the two fault waves is calculated;

[0043] determining a theoretical fault location based on the wave velocity of the equivalent overhead line section and the wave front signal time difference;

[0044] An actual fault location is obtained, and the wave velocity of the equivalent overhead line section is corrected according to the actual fault location and the theoretical fault location.

[0045] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0046] Obtaining a total length of a target power line in a power topology structure, wherein the target power line includes at least one cable segment and an overhead line segment;

[0047] The theoretical wave velocity rating of each cable segment is calculated based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment;

[0048] Obtaining temperature measurement results at preset time intervals, and calculating a theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value, normalizing the theoretical wave velocity real-time value of each cable segment and converting it into a wave velocity of an equivalent overhead line segment;

[0049] In the event of a line fault, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave head signals of the fault wave respectively, and the time difference between the wave head signals of the two fault waves is calculated;

[0050] determining a theoretical fault location based on the wave velocity of the equivalent overhead line section and the wave front signal time difference;

[0051] An actual fault location is obtained, and the wave velocity of the equivalent overhead line section is corrected according to the actual fault location and the theoretical fault location.

[0052] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the following steps:

[0053] Obtaining a total length of a target power line in a power topology structure, wherein the target power line includes at least one cable segment and an overhead line segment;

[0054] The theoretical wave velocity rating of each cable segment is calculated based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment;

[0055] Obtaining temperature measurement results at preset time intervals, and calculating a theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value, normalizing the theoretical wave velocity real-time value of each cable segment and converting it into a wave velocity of an equivalent overhead line segment;

[0056] In the event of a line fault, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave head signals of the fault wave respectively, and the time difference between the wave head signals of the two fault waves is calculated;

[0057] determining a theoretical fault location based on the wave velocity of the equivalent overhead line section and the wave front signal time difference;

[0058] An actual fault location is obtained, and the wave velocity of the equivalent overhead line section is corrected according to the actual fault location and the theoretical fault location.

[0059] The above-mentioned hybrid line fault ranging method, device, computer equipment, computer-readable storage medium and computer program product based on traveling wave ranging calculate the theoretical wave velocity rating of the cable segment according to the conductor material parameters, relative dielectric constant, relative magnetic permeability and other parameters of the cable segment, convert the real-time value of the theoretical wave velocity of the cable segment into the wave velocity of the equivalent overhead line segment in proportion, and form a unified reference wave velocity value. The length of the equivalent overhead line is obtained according to the wave velocity of the equivalent overhead line segment and the time difference of the wave head signal, and the actual fault location is restored through a mapping table. Then, according to the deviation between the actual historical fault location and the estimated location, the normalized wave velocity of the equivalent overhead line segment is continuously corrected, making the ranging system more accurate. Compared with traditional technologies, there is no need to set up multiple traveling wave measurement terminals, which saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0061] Figure 1 FIG. 1 is an application environment diagram of a hybrid line fault location method based on traveling wave ranging in one embodiment;

[0062] Figure 2 1 is a flow chart of a hybrid line fault location method based on traveling wave ranging in one embodiment;

[0063] Figure 3 1 is a flow chart of a hybrid line fault location method based on traveling wave ranging in another embodiment;

[0064] Figure 4 is a schematic diagram of a target power line and a fault point in another embodiment;

[0065] Figure 5 It is a structural block diagram of a hybrid line fault distance measuring device based on traveling wave distance measuring in the most detailed embodiment;

[0066] Figure 6 1 is a structural block diagram of a hybrid line fault distance measurement device based on traveling wave distance measurement in one embodiment;

[0067] Figure 7 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0069] The hybrid line fault location method based on traveling wave ranging provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, the terminal 102 communicates with the server 104 via a network. The data storage system can store data that the server 104 needs to process. The data storage system can be integrated on the server 104 or placed on the cloud or other network servers.

[0070] The server 104 controls the terminal 102 to obtain the total length of the target power line in the power topology structure, where the target power line includes at least one cable segment and an overhead line segment; the server 104 calculates the theoretical wave velocity rating of each cable segment based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment; the server 104 controls the terminal 102 to obtain the temperature measurement results at preset time intervals, and the server 104 calculates the theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rating, and normalizes the theoretical wave velocity real-time value of each cable segment. The server 104 controls the terminal 102 to obtain the wave head signals of the fault wave respectively through two traveling wave measurement terminals located at both ends of the target power line in the event of a line fault, and calculates the wave head signal time difference between the wave head signals of the two fault waves; the server 104 determines the theoretical fault location based on the wave speed and the wave head signal time difference of the equivalent overhead line segment; the server 104 controls the terminal 102 to obtain the actual fault location, and the server 104 corrects the wave speed of the equivalent overhead line segment based on the actual fault location and the theoretical fault location.

[0071] The terminal 102 may be, but is not limited to, various personal computers, laptops, smartphones, tablets, IoT devices, and portable wearable devices. IoT devices may include smart speakers, smart TVs, smart air conditioners, smart car devices, projectors, and the like. Portable wearable devices may include smart watches, smart bracelets, head-mounted devices, and the like. Head-mounted devices may include virtual reality (VR) devices, augmented reality (AR) devices, smart glasses, and the like. The server 104 may be an independent physical server, a server cluster or distributed system consisting of multiple physical servers, or a cloud server providing cloud computing services.

[0072] In an exemplary embodiment, Figure 2As shown in the figure, a hybrid line fault location method based on traveling wave ranging is provided, and the method is applied to Figure 1 The server in the example is used to illustrate the method, which includes the following steps S202 to S212.

[0073] Step S202: Acquire the total length of a target power line in the power topology structure, where the target power line includes at least one cable segment and an overhead line segment.

[0074] Specifically, the power topology refers to the connection relationship and layout between the various components of the power system (such as power stations, substations, transmission lines, etc.). Within this structure, different power lines can be identified, including cable segments and overhead line segments. The target power line refers to the specific line in the power topology that needs to be fault located. This line may be composed of different media, such as cables and overhead lines, which have different physical properties and wave speeds. In order to perform traveling wave ranging, the total length of the target power line needs to be known, which involves measuring and accumulating the lengths of all cable segments and overhead line segments in the line.

[0075] Among them, the cable segment refers to the part of the line composed of cables, and the overhead line segment refers to the part composed of overhead lines; due to the different wave speeds of cables and overhead lines, this will affect the accuracy of traveling wave ranging.

[0076] Step S204 : Calculate the theoretical wave velocity rating of each cable segment based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment.

[0077] Conductor material parameters refer to the electrical properties of the cable conductor, such as resistivity and conductivity. These parameters influence the propagation of electromagnetic waves in the cable because they determine how and how efficiently current flows in the conductor. The relative permittivity, also known as the dielectric constant, is a dimensionless parameter that describes the ability of an insulating material to store electrical energy in an electric field. Relative permittivity is a property of the insulating material itself, and compared to the dielectric constant in a vacuum, it affects the formation and distribution of the electric field within the cable. Relative permeability is a characteristic of the material itself, describing its ability to store magnetic energy in a magnetic field. Compared to the magnetic permeability in a vacuum, relative permeability affects the formation and distribution of the magnetic field within the cable.

[0078] Using these parameters, the theoretical propagation speed of electromagnetic waves in the cable is calculated through the calculation formula of the theoretical wave speed rating. This speed is the theoretical wave speed rating of the cable segment, which is a key parameter used in subsequent traveling wave ranging calculations.

[0079] Step S206: Obtain temperature measurement results at preset time intervals, and calculate the theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value. Normalize the theoretical wave velocity real-time value of each cable segment and convert it into the wave velocity of the equivalent overhead line segment.

[0080] Specifically, the system automatically measures the temperature at a pre-set time interval (e.g., every hour or every half hour). This interval can be adjusted according to actual needs to ensure the accuracy and real-time nature of the measurement results.

[0081] Temperature is a significant factor affecting the dielectric and magnetic properties of cable materials, which in turn influences the propagation speed of electromagnetic waves within the cable. Therefore, the system needs to regularly measure the ambient or internal temperature of the cable line and obtain temperature measurement results.

[0082] Since temperature changes will affect the dielectric constant and magnetic permeability of the cable, it is necessary to calculate the real-time value of the theoretical wave velocity under current conditions based on the latest temperature measurement results and the theoretical wave velocity rating of the cable. This involves adjusting the original theoretical wave velocity rating to reflect the impact of temperature changes on the wave velocity.

[0083] Since different cable segments may have different wave velocities, directly using these different wave velocity values may lead to ranging errors. Therefore, these wave velocity values need to be normalized, that is, converted into a unified reference wave velocity value according to a certain ratio.

[0084] The adjusted theoretical real-time velocity is converted proportionally to the velocity of an equivalent overhead line segment. The goal of normalization is to unify the velocity of different cable segments to a common reference value, typically the equivalent overhead line velocity. Because the velocity of overhead lines is typically closer to the speed of light and less affected by environmental factors, they serve as a stable reference standard.

[0085] Through normalization, the wave velocities of all cable segments are converted to the wave velocities of equivalent overhead line segments, forming a unified reference wave velocity value. This unified wave velocity value is used in subsequent fault location calculations to improve accuracy and consistency.

[0086] The equivalent overhead line length is calculated using a unified reference wave velocity and the time difference of the wave front signals detected by the traveling wave measurement terminal. This length reflects the electromagnetic wave propagation distance from the fault point to the measurement terminal. A mapping table is used to convert the equivalent overhead line length to the actual fault location. The mapping table provides a correspondence between the equivalent length and the actual length, enabling accurate fault location.

[0087] Step S208 : When a line fault occurs, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave crest signals of the fault wave respectively, and calculate the wave crest signal time difference between the wave crest signals of the two fault waves.

[0088] Specifically, the traveling wave measurement terminal is a device installed at both ends of the target power line to detect and record the traveling wave signal; it can be a relay, sensor or other type of measuring device that can accurately capture the wave head (i.e. the leading part of the traveling wave).

[0089] When a fault occurs, the fault point generates traveling waves in both directions along the line. The head signals of these traveling waves contain information about the time of fault occurrence. The head signal is the first part of the traveling wave to reach the measurement terminal and contains key information about the fault location. The two traveling wave measurement terminals each record the arrival time of the traveling wave head from the fault point to their respective locations. These time records serve as the basis for subsequent fault location calculation.

[0090] By comparing the arrival times of the wave fronts recorded by the two traveling wave measurement terminals, we can obtain the time difference of the wave front signals. This time difference reflects the difference in distance from the fault point to the two traveling wave measurement terminals. Using the time difference of the wave front signals and the known wave velocity (which can be obtained from the normalization process described above for the equivalent overhead line section), we can calculate the distance from the fault point to the two traveling wave measurement terminals.

[0091] Step S210: determining a theoretical fault location based on the wave velocity and wave front signal time difference of the equivalent overhead line section.

[0092] Specifically, the wave velocity and wave head signal time difference of the equivalent overhead line section can be used to calculate the distance from the fault point to the two traveling wave measurement terminals. Since traveling waves propagate bidirectionally, the time difference can be used to calculate the one-way propagation time, and thus the distance. The theoretical fault location of the fault point on the power line can be determined by combining the position of the traveling wave measurement terminal and the calculated distance.

[0093] Step S212: obtaining the actual fault location, and correcting the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location.

[0094] Specifically, the actual location of the fault on the target power line is directly determined through manual inspections, drone inspections, or other detection methods. This location is obtained through actual measurements and can be considered accurate. The theoretical fault location is calculated using traveling wave ranging technology based on the wave velocity and wave head signal time difference of the equivalent overhead line section.

[0095] Compare the actual fault location with the theoretical fault location and analyze the deviation between the two. This deviation may be caused by inaccurate model assumptions, changes in environmental factors, measurement errors, etc.

[0096] Based on the deviation between the actual fault location and the theoretical fault location, the wave velocity of the equivalent overhead line section is corrected. This correction process can use methods such as statistical analysis and machine learning to obtain a more accurate wave velocity model through historical data learning. The corrected wave velocity is closer to the actual situation and can reduce the error in subsequent fault location. The corrected wave velocity is applied to the new fault location calculation to obtain a new theoretical fault location. It is then compared with the actual fault location again and the correction process is repeated. Through multiple iterations, the wave velocity model is continuously optimized to improve the accuracy of fault location. By continuously correcting the wave velocity, the reliability and accuracy of the traveling wave ranging system can be improved. This helps to locate faults quickly and accurately, reduce power outages, and improve the stability and reliability of the power system. Compared with traditional multi-terminal measurement methods, this method can save costs because it reduces the number of measuring terminals required, while improving positioning accuracy by continuously correcting the wave velocity.

[0097] In the above-mentioned hybrid line fault ranging method based on traveling wave ranging, the theoretical wave velocity rating of the cable segment is calculated according to the conductor material parameters, relative dielectric constant, relative magnetic permeability and other parameters of the cable segment. The real-time value of the theoretical wave velocity of the cable segment is converted proportionally into the wave velocity of the equivalent overhead line segment to form a unified reference wave velocity value. The length of the equivalent overhead line is obtained according to the wave velocity of the equivalent overhead line segment and the time difference of the wave head signal. The actual fault location is then restored through a mapping table. Based on the deviation between the actual historical fault location and the estimated location, the normalized wave velocity of the equivalent overhead line segment is continuously corrected, making the ranging system more accurate. Compared with traditional technologies, there is no need to set up multiple traveling wave measurement terminals, which saves costs.

[0098] In an exemplary embodiment, temperature measurement results are obtained at preset time intervals, and a real-time theoretical wave velocity value of each cable segment is calculated based on the temperature measurement results and the theoretical wave velocity rated value, including:

[0099] determining the current temperature from the temperature measurement result, and calculating the temperature difference between the current temperature and the reference temperature;

[0100] Calculating a first product result of the temperature difference and a preset temperature coefficient;

[0101] The theoretical wave velocity real-time value of each cable segment is calculated based on the first product result and the theoretical wave velocity rated value.

[0102] Specifically, a temperature sensor is set in the internal CPU chip of the traveling wave ranging terminal, and the traveling wave ranging master station system is used to obtain the line environment temperature data in real time. The temperature of the current line section is Qn, and K(Qn-Q0) is the first product result, where K is the temperature coefficient, Qn is the current temperature, and Q0 is the reference temperature. Therefore, the theoretical wave speed real-time value Vn=Vn0[1-K(Qn-Q0)], and the theoretical wave speed rated value Vn0 is measured under the reference temperature Q0 environment.

[0103] In this embodiment, an integrated temperature sensor acquires real-time ambient temperature data from power lines and dynamically adjusts the theoretical wave velocity of the cable segment. This approach improves the accuracy of wave velocity calculation and enhances the reliability of fault location, enabling rapid and accurate identification and repair of faults in the power system. This dynamic adjustment mechanism reduces manual intervention, lowers maintenance costs, and enhances the system's intelligence and adaptability. By optimizing wave velocity calculation, power outages are reduced, power transmission efficiency is improved, and the operational efficiency of the power system is enhanced.

[0104] In an exemplary embodiment, the calculation formula of the theoretical wave speed rating includes:

[0105]

[0106] Among them, V n0 is the theoretical wave velocity rating, α n is the conductor material parameter of the current cable segment, C is the speed of light, μ n is the relative dielectric constant of the current cable segment, ε n is the relative permeability of the current cable segment.

[0107] Specifically, a formula for calculating the theoretical wave velocity rating of a cable segment allows for precise adaptation to varying cable characteristics, significantly improving the fault location accuracy of traveling wave ranging technology. This method comprehensively considers the cable's conductor material parameters, relative permittivity and relative permeability, as well as the speed of light, to ensure that the calculated results truly reflect the propagation speed of electromagnetic waves in the cable. Accurate wave velocity calculations also reduce the need for additional inspections and maintenance due to misjudgments, thereby reducing operating costs and improving the economic benefits of the entire power system.

[0108] In an exemplary embodiment, Figure 3 As shown, the theoretical fault location is determined based on the wave velocity and wave head signal time difference of the equivalent overhead line section, including:

[0109] Step S302, obtaining a second product result between the wave velocity and the wave front signal time difference of the equivalent overhead line section;

[0110] Step S304: determining a theoretical fault location according to the second multiplication result and the total length of the target power line.

[0111] Specifically, if Figure 4 Figure 1 shows a schematic diagram of the target power line and fault point. The entire line consists of three power line segments: F1 (overhead line), F2 (cable), and F3 (overhead line). The fault occurs at any location between the three cable segments. Let S be the total length of line AB at both ends, S' be the equivalent total length, and the lengths of the cable segments F1, F2, and F3 be L1, L2, and L3, respectively. S1' is the equivalent distance from the fault point to line end A, S2' is the equivalent distance from the fault point to line end B, T1 is the time it takes for the fault wave to reach end A, and T2 is the time it takes for the fault wave to reach end B. Two traveling wave measurement terminals are located at positions A and B, respectively.

[0112] First, since the sum of the distances from the fault point to both ends of line AB is equal to the total line length S1'+S2'=S', according to the time difference T2-T1 of the traveling wave head measured by the two traveling wave detection terminals, it can be obtained that S2'-S1'=(T2-T1)V max , from which we can conclude that S1'=((T1-T2)V max ) / 2+(S') / 2, S2'=((T2-T1)V max ) / 2+(S') / 2, and then the theoretical fault location is obtained based on the relationship between the equivalent length and actual length of each cable segment.

[0113] When forming the wave velocity of the equivalent overhead line, the wave velocity Vn of the equivalent overhead line of all cable segments is set to be the wave velocity V of the cable segment with the largest real-time theoretical wave velocity value. max , change the length of other cable segments as equivalent length, let the equivalent length of other cable segments be Ln', then Ln' / Ln=V max / Vn=k, where Ln is the actual length of the cable segment numbered n.

[0114] In this embodiment, by accurately calculating the wave velocity of the equivalent overhead line section and utilizing the time difference of the wave head signal, the power line fault position is quickly and accurately located. Specifically, the method first obtains the second product result between the wave velocity of the equivalent overhead line section and the wave head signal time difference, and then calculates the distance from the fault point to both ends of the line based on this product result and the total length of the target power line, thereby determining the theoretical fault position. By considering the different power line sections (such as overhead lines and cables) contained in the entire line, and utilizing the time difference of the traveling wave head measured by the traveling wave measurement terminal, this technology can calculate the distance difference from the fault point to both ends of the line, and determine the specific location of the fault point accordingly. In addition, by unifying the equivalent overhead line wave velocity of all cable segments to the wave velocity of the cable segment with the largest theoretical wave velocity real-time value, and adjusting the equivalent length of other cable segments, the method further improves the accuracy of fault location.

[0115] In an exemplary embodiment, obtaining an actual fault location and correcting the wave velocity of an equivalent overhead line section according to the actual fault location and a theoretical fault location include:

[0116] Determine the reference wave velocity based on the actual fault location and the theoretical fault location;

[0117] Obtaining the wave velocity difference between the wave velocity of the equivalent overhead line section and the reference wave velocity, and using it as a wave velocity correction value;

[0118] According to the preset correction weight coefficient, based on the wave velocity of the equivalent overhead line section and the wave velocity correction value, the corrected wave velocity of the equivalent overhead line section is obtained.

[0119] Specifically, after substituting the actual fault location confirmed by manual and UAV line inspection, the reference wave velocity obtained by reverse calculation is V', where V' = [2S1' × k + 2L1 × (1-k) - S'] / (T1-T2), and the corrected wave velocity Vt = V' - V max , so that V max Add the corrected wave velocity Vt to correct the wave velocity of the equivalent overhead line section, and the corrected wave velocity Vt of the equivalent overhead line section is maxt =δV max +(1-δ)Vt, where δ is the correction weight coefficient, which indicates the degree of confidence in the original wave velocity.

[0120] Specifically, by obtaining the actual fault location and comparing it with the theoretical fault location, a precise correction of the wave velocity of the equivalent overhead line section is achieved. First, a reference wave velocity is determined. The difference between the wave velocity of the equivalent overhead line section and the reference wave velocity is then calculated as the wave velocity correction value. Next, a preset correction weight coefficient is used to combine the original wave velocity and the wave velocity correction value to calculate the corrected wave velocity of the equivalent overhead line section. This process not only improves the accuracy of fault location, but also, by introducing the correction weight coefficient, makes the corrected wave velocity more consistent with the actual situation, thereby optimizing the performance of the traveling wave ranging system and enhancing the system's adaptability and reliability.

[0121] In an exemplary embodiment, after obtaining the actual fault location and correcting the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location, the method further includes:

[0122] Obtain the relative relationship between the actual fault location and the theoretical fault location;

[0123] If the actual fault location is on the left side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the right of the cable segment where the theoretical fault location is located. If the actual fault location is on the right side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the left of the cable segment where the theoretical fault location is located.

[0124] Specifically, the system first needs to determine the relative relationship between the actual fault location and the previously calculated theoretical fault location. This means clarifying whether the actual fault occurs to the left or right of the theoretical fault location.

[0125] Based on the actual fault location relative to the theoretical fault location, the system adjusts the theoretical wave velocity rating accordingly. If there is a deviation between the actual fault location and the theoretical fault location, this deviation may be due to inaccurate wave velocity estimation for certain cable sections.

[0126] If the actual fault location is to the left of the theoretical fault location, this means the traveling wave took less time to reach the measurement terminal than expected. Therefore, the system increases the theoretical wave velocity ratings for the cable segments to the right of the theoretical fault location. This is done to reduce the estimated traveling wave propagation time for these segments in future calculations, thereby bringing the theoretical fault location closer to the actual fault location.

[0127] Conversely, if the actual fault location is to the right of the theoretical fault location, the system increases the theoretical wave velocity ratings of the cable segments to the left of the segment where the theoretical fault location is located. This is to increase the expected traveling wave propagation time for these cable segments in future calculations, again to bring the theoretical fault location closer to the actual fault location.

[0128] This process can be viewed as an iterative optimization, where the accuracy of fault location can be gradually improved by continuously comparing the actual fault location with the theoretical fault location and adjusting the theoretical wave velocity rating accordingly.

[0129] In this embodiment, this method enables the system to learn and adapt to actual line conditions, thereby improving the accuracy of traveling wave ranging. This is crucial for quickly and accurately locating faults in power systems, helping to reduce power outages and improve power supply reliability. In summary, this process compensates for deviations between the actual and theoretical fault locations by adjusting the theoretical wave velocity rating, thereby improving fault location accuracy and making the traveling wave ranging system more precise and reliable.

[0130] The most detailed embodiment of this application is:

[0131] A hybrid line fault location device based on traveling wave ranging, such as Figure 5 As shown, it includes a theoretical position estimation module, an actual position optimization module, and an error analysis module. The theoretical position estimation module is used to estimate the fault position between two traveling wave measurement terminals based on the topological structure of the entire line, the physical properties of the line itself, and the time difference of the traveling wave head detected by the traveling wave measurement terminal. The actual position optimization module is used to determine the actual fault position and optimize the theoretically calculated wave velocity according to the deviation between the estimated fault position and the actual fault position. The error analysis module is used to correct the theoretical wave velocity of each cable segment of the line according to the difference in detection results between multiple different actual fault positions.

[0132] Among them, the theoretical position estimation module includes a fixed parameter entry module, a real-time parameter measurement module, a theoretical wave speed calculation module, a wave speed normalization module, a traveling wave measurement terminal, a time statistics module, a fault location calculation module, and a topology structure generation module. The fixed parameter entry module and the real-time parameter measurement module are electrically connected to the theoretical wave speed calculation module, the theoretical wave speed calculation module is electrically connected to the wave speed normalization module, the traveling wave measurement terminal is electrically connected to the time statistics module, the equivalent wave speed calculation module is electrically connected to the time statistics module and the theoretical wave speed calculation module, the fault location calculation module is electrically connected to the wave speed normalization module, and the topology structure generation module is electrically connected to the fault location calculation module;

[0133] Among them, the fixed parameter input module is used to input the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment; the real-time parameter measurement module is used to obtain temperature measurement results to calculate the internal temperature of the line; the theoretical wave velocity calculation module is used to calculate the theoretical wave velocity of the line based on the comprehensive calculation results of the fixed parameters and the implementation parameters; the wave velocity normalization module is used to convert the theoretical wave velocity of the cable segment into the wave velocity of the equivalent overhead line in proportion to form a unified reference wave velocity value; the traveling wave measurement terminal is used to measure the wave head signal of the fault traveling wave; the time statistics module is used to count the time when the traveling wave measurement terminal measures the wave head signal of the fault traveling wave; the fault location calculation module is used to calculate the theoretical fault location based on the time when the fault traveling wave head signal is measured and the wave velocity of the equivalent overhead line; the topology structure generation module is used to obtain the topology of the entire line from the local power supply bureau to obtain the installation position of the traveling wave measurement terminal and the total length of the line.

[0134] Among them, the actual position optimization module includes a manual position determination module, a drone inspection confirmation module, and an equivalent wave speed correction module. The manual position determination module and the drone inspection confirmation module are both electrically connected to the equivalent wave speed correction module. The manual position determination module is used to manually enter the actual fault position detected. The drone inspection confirmation module is used to enter the actual fault position after the drone detects it. The equivalent wave speed correction module is used to correct the equivalent overhead line wave speed according to the deviation between the actual fault position and the theoretical fault position.

[0135] Among them, the error analysis module includes a measurement result statistics module, an error weight calculation module, and a theoretical wave speed correction module. The measurement result statistics module is electrically connected to the manual position determination module and the drone inspection confirmation module, and the error weight calculation module is electrically connected to the theoretical wave speed correction module. The measurement result statistics module is used to count the actual fault locations in history, the error weight calculation module is used to compare the theoretical values of each actual fault location with the actual wave speed deviation results, and arrange the error weights of each cable segment, and the theoretical wave speed correction module is used to correct the theoretical wave speed of each cable segment.

[0136] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0137] Based on the same inventive concept, embodiments of the present application further provide a hybrid line fault ranging device based on traveling wave ranging for implementing the aforementioned hybrid line fault ranging method based on traveling wave ranging. The implementation solution provided by this device is similar to the implementation solution described in the aforementioned method. Therefore, the specific limitations of one or more embodiments of the hybrid line fault ranging device based on traveling wave ranging provided below can be found in the above-mentioned limitations of the hybrid line fault ranging method based on traveling wave ranging, and will not be repeated here.

[0138] In an exemplary embodiment, Figure 6 As shown, a hybrid line fault location device based on traveling wave ranging is provided, comprising:

[0139] A line length determination module 602 is configured to obtain a total length of a target power line in a power topology structure, where the target power line includes at least one cable segment and an overhead line segment.

[0140] A calculation module 604 is configured to calculate a theoretical wave velocity rating of each cable segment based on the conductor material parameters, relative dielectric constant, and relative permeability of the cable segment;

[0141] The calculation module 604 is further configured to obtain temperature measurement results at preset time intervals, and calculate the theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value;

[0142] Normalization processing module 606, used to normalize the real-time value of the theoretical wave velocity of each cable segment and convert it into the wave velocity of the equivalent overhead line segment;

[0143] The calculation module 604 is further configured to obtain the wave crest signals of the fault wave through two traveling wave measurement terminals located at both ends of the target power line, and calculate the wave crest signal time difference between the wave crest signals of the two fault waves when a line fault occurs;

[0144] The fault location determination module 608 is used to determine the theoretical fault location based on the wave velocity and wave front signal time difference of the equivalent overhead line section;

[0145] The wave velocity correction module 610 is used to obtain the actual fault location and correct the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location.

[0146] In an exemplary embodiment, the calculation module 604 is also used to determine the current temperature from the temperature measurement results, calculate the temperature difference between the current temperature and the reference temperature; calculate the first product result of the temperature difference and the preset temperature coefficient; and calculate the real-time value of the theoretical wave velocity of each cable segment based on the first product result and the theoretical wave velocity rated value.

[0147] In one embodiment, the calculation formula of the theoretical wave speed rating includes:

[0148]

[0149] Among them, V n0 is the theoretical wave velocity rating, α n is the conductor material parameter of the current cable segment, C is the speed of light, μ n is the relative dielectric constant of the current cable segment, ε n is the relative permeability of the current cable segment.

[0150] In an exemplary embodiment, the fault location determination module 608 is specifically configured to obtain a second product result between the wave velocity and the wave head signal time difference of the equivalent overhead line segment; and determine a theoretical fault location based on the second product result and the total length of the target power line.

[0151] In an exemplary embodiment, the wave velocity correction module 610 is specifically used to determine a reference wave velocity based on the actual fault location and the theoretical fault location; obtain the wave velocity difference between the wave velocity of the equivalent overhead line section and the reference wave velocity, and use it as a wave velocity correction value; and obtain the corrected wave velocity of the equivalent overhead line section based on the wave velocity of the equivalent overhead line section and the wave velocity correction value according to a preset correction weight coefficient.

[0152] In an exemplary embodiment, the wave velocity correction module 610 is also used to obtain the relative relationship between the actual fault location and the theoretical fault location; if the actual fault location is on the left side of the theoretical fault location, the theoretical wave velocity rating of each cable segment to the right of the cable segment where the theoretical fault location is located is increased; if the actual fault location is on the right side of the theoretical fault location, the theoretical wave velocity rating of each cable segment to the left of the cable segment where the theoretical fault location is located is increased.

[0153] Each module in the hybrid line fault location device based on traveling wave ranging can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a memory in the computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0154] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 7 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store conductor material parameters, relative dielectric constant, and relative magnetic permeability data of the cable segment. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a hybrid line fault ranging method based on traveling wave ranging is implemented.

[0155] Those skilled in the art will understand that Figure 7 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 shown in the figure, or combine certain components, or have a different component arrangement.

[0156] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0157] Obtaining a total length of a target power line in a power topology structure, where the target power line includes at least one cable segment and an overhead line segment;

[0158] The theoretical wave velocity rating of each cable segment is calculated based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment;

[0159] Obtain temperature measurement results at preset time intervals, and calculate the theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rating. Normalize the theoretical wave velocity real-time value of each cable segment and convert it into the wave velocity of an equivalent overhead line segment.

[0160] In the event of a line fault, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave head signals of the fault wave respectively, and the time difference between the wave head signals of the two fault waves is calculated;

[0161] Determine the theoretical fault location based on the wave velocity and wave head signal time difference of the equivalent overhead line section;

[0162] The actual fault location is obtained, and the wave velocity of the equivalent overhead line section is corrected according to the actual fault location and the theoretical fault location.

[0163] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0164] determining the current temperature from the temperature measurement result, and calculating the temperature difference between the current temperature and the reference temperature;

[0165] Calculating a first product result of the temperature difference and a preset temperature coefficient;

[0166] The theoretical wave velocity real-time value of each cable segment is calculated based on the first product result and the theoretical wave velocity rated value.

[0167] In one embodiment, the calculation formula of the theoretical wave speed rating includes:

[0168]

[0169] Among them, V n0 is the theoretical wave velocity rating, α n is the conductor material parameter of the current cable segment, C is the speed of light, μ n is the relative dielectric constant of the current cable segment, ε n is the relative permeability of the current cable segment.

[0170] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0171] Obtaining a second product result between the wave velocity and the wave head signal time difference of the equivalent overhead line section;

[0172] A theoretical fault location is determined based on the second product result and the total length of the target power line.

[0173] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0174] Determine the reference wave velocity based on the actual fault location and the theoretical fault location;

[0175] Obtaining the wave velocity difference between the wave velocity of the equivalent overhead line section and the reference wave velocity, and using it as a wave velocity correction value;

[0176] According to the preset correction weight coefficient, based on the wave velocity of the equivalent overhead line section and the wave velocity correction value, the corrected wave velocity of the equivalent overhead line section is obtained.

[0177] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0178] Obtain the relative relationship between the actual fault location and the theoretical fault location;

[0179] If the actual fault location is on the left side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the right of the cable segment where the theoretical fault location is located. If the actual fault location is on the right side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the left of the cable segment where the theoretical fault location is located.

[0180] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0181] Obtaining a total length of a target power line in a power topology structure, where the target power line includes at least one cable segment and an overhead line segment;

[0182] The theoretical wave velocity rating of each cable segment is calculated based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment;

[0183] Obtain temperature measurement results at preset time intervals, and calculate the theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rating. Normalize the theoretical wave velocity real-time value of each cable segment and convert it into the wave velocity of an equivalent overhead line segment.

[0184] In the event of a line fault, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave head signals of the fault wave respectively, and the time difference between the wave head signals of the two fault waves is calculated;

[0185] Determine the theoretical fault location based on the wave velocity and wave head signal time difference of the equivalent overhead line section;

[0186] The actual fault location is obtained, and the wave velocity of the equivalent overhead line section is corrected according to the actual fault location and the theoretical fault location.

[0187] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0188] determining the current temperature from the temperature measurement result, and calculating the temperature difference between the current temperature and the reference temperature;

[0189] Calculating a first product result of the temperature difference and a preset temperature coefficient;

[0190] The theoretical wave velocity real-time value of each cable segment is calculated based on the first product result and the theoretical wave velocity rated value.

[0191] In one embodiment, the calculation formula of the theoretical wave speed rating includes:

[0192]

[0193] Among them, V n0 is the theoretical wave velocity rating, α n is the conductor material parameter of the current cable segment, C is the speed of light, μ n is the relative dielectric constant of the current cable segment, ε n is the relative permeability of the current cable segment.

[0194] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0195] Obtaining a second product result between the wave velocity and the wave head signal time difference of the equivalent overhead line section;

[0196] A theoretical fault location is determined based on the second product result and the total length of the target power line.

[0197] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0198] Determine the reference wave velocity based on the actual fault location and the theoretical fault location;

[0199] Obtaining the wave velocity difference between the wave velocity of the equivalent overhead line section and the reference wave velocity, and using it as a wave velocity correction value;

[0200] According to the preset correction weight coefficient, based on the wave velocity of the equivalent overhead line section and the wave velocity correction value, the corrected wave velocity of the equivalent overhead line section is obtained.

[0201] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0202] Obtain the relative relationship between the actual fault location and the theoretical fault location;

[0203] If the actual fault location is on the left side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the right of the cable segment where the theoretical fault location is located. If the actual fault location is on the right side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the left of the cable segment where the theoretical fault location is located.

[0204] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0205] Obtaining a total length of a target power line in a power topology structure, where the target power line includes at least one cable segment and an overhead line segment;

[0206] The theoretical wave velocity rating of each cable segment is calculated based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment;

[0207] Obtain temperature measurement results at preset time intervals, and calculate the theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rating. Normalize the theoretical wave velocity real-time value of each cable segment and convert it into the wave velocity of an equivalent overhead line segment.

[0208] In the event of a line fault, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave head signals of the fault wave respectively, and the time difference between the wave head signals of the two fault waves is calculated;

[0209] Determine the theoretical fault location based on the wave velocity and wave head signal time difference of the equivalent overhead line section;

[0210] The actual fault location is obtained, and the wave velocity of the equivalent overhead line section is corrected according to the actual fault location and the theoretical fault location.

[0211] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0212] determining the current temperature from the temperature measurement result, and calculating the temperature difference between the current temperature and the reference temperature;

[0213] Calculating a first product result of the temperature difference and a preset temperature coefficient;

[0214] The theoretical wave velocity real-time value of each cable segment is calculated based on the first product result and the theoretical wave velocity rated value.

[0215] In one embodiment, the calculation formula of the theoretical wave speed rating includes:

[0216]

[0217] Among them, V n0 is the theoretical wave velocity rating, α n is the conductor material parameter of the current cable segment, C is the speed of light, μ n is the relative dielectric constant of the current cable segment, ε n is the relative permeability of the current cable segment.

[0218] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0219] Obtaining a second product result between the wave velocity and the wave head signal time difference of the equivalent overhead line section;

[0220] A theoretical fault location is determined based on the second product result and the total length of the target power line.

[0221] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0222] Determine the reference wave velocity based on the actual fault location and the theoretical fault location;

[0223] Obtaining the wave velocity difference between the wave velocity of the equivalent overhead line section and the reference wave velocity, and using it as a wave velocity correction value;

[0224] According to the preset correction weight coefficient, based on the wave velocity of the equivalent overhead line section and the wave velocity correction value, the corrected wave velocity of the equivalent overhead line section is obtained.

[0225] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0226] Obtain the relative relationship between the actual fault location and the theoretical fault location;

[0227] If the actual fault location is on the left side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the right of the cable segment where the theoretical fault location is located. If the actual fault location is on the right side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the left of the cable segment where the theoretical fault location is located.

[0228] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0229] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile memory and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processor (DSP), a programmable logic unit (PLC), a data processing logic unit based on quantum computing, an artificial intelligence (AI) processor, and the like.

[0230] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0231] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A hybrid line fault location method based on traveling wave ranging, characterized in that: The method comprises: Obtaining a total length of a target power line in a power topology structure, wherein the target power line includes at least one cable segment and an overhead line segment; The theoretical wave velocity rating of each cable segment is calculated based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment; Obtaining temperature measurement results at preset time intervals, and calculating a theoretical wave velocity real-time value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value, normalizing the theoretical wave velocity real-time value of each cable segment and converting it into a wave velocity of an equivalent overhead line segment; In the event of a line fault, two traveling wave measurement terminals located at both ends of the target power line are used to obtain the wave head signals of the fault wave respectively, and the time difference between the wave head signals of the two fault waves is calculated; determining a theoretical fault location based on the wave velocity of the equivalent overhead line section and the wave front signal time difference; An actual fault location is obtained, and the wave velocity of the equivalent overhead line section is corrected according to the actual fault location and the theoretical fault location.

2. The method according to claim 1, characterized in that The step of obtaining the temperature measurement result at a preset time interval and calculating the theoretical wave velocity real-time value of each cable segment based on the temperature measurement result and the theoretical wave velocity rated value includes: determining a current temperature from the temperature measurement result, and calculating a temperature difference between the current temperature and a reference temperature; Calculating a first product result of the temperature difference and a preset temperature coefficient; The theoretical wave velocity real-time value of each cable segment is calculated based on the first product result and the theoretical wave velocity rated value.

3. The method according to claim 1, characterized in that The calculation formula of the theoretical wave speed rating includes: Among them, V n0 is the theoretical wave velocity rating, α n is the conductor material parameter of the current cable segment, C is the speed of light, μ n is the relative dielectric constant of the current cable segment, ε n is the relative permeability of the current cable segment.

4. The method according to claim 1, wherein Determining the theoretical fault location according to the wave velocity of the equivalent overhead line section and the wave front signal time difference includes: Obtaining a second product result between the wave velocity of the equivalent overhead line section and the wave front signal time difference; A theoretical fault location is determined according to the second multiplication result and the total length of the target power line.

5. The method according to claim 1, wherein The obtaining of the actual fault location and correcting the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location include: Determine the reference wave velocity based on the actual fault location and the theoretical fault location; Obtaining a wave velocity difference between the wave velocity of the equivalent overhead line section and the reference wave velocity, and using the difference as a wave velocity correction value; According to a preset correction weight coefficient, based on the wave velocity of the equivalent overhead line section and the wave velocity correction value, a corrected wave velocity of the equivalent overhead line section is obtained.

6. The method according to claim 1, characterized in that After obtaining the actual fault location and correcting the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location, the method further includes: Obtain the relative relationship between the actual fault location and the theoretical fault location; If the actual fault location is on the left side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the right of the cable segment where the theoretical fault location is located. If the actual fault location is on the right side of the theoretical fault location, then increase the theoretical wave velocity rating of each cable segment to the left of the cable segment where the theoretical fault location is located.

7. A hybrid line fault distance measurement device based on traveling wave distance measurement, characterized in that: The device comprises: a line length determination module, which obtains a total length of a target power line in a power topology structure, wherein the target power line includes at least one cable segment and an overhead line segment; A calculation module is used to calculate the theoretical wave velocity rating of each cable segment based on the conductor material parameters, relative dielectric constant, and relative magnetic permeability of the cable segment; The calculation module is further configured to obtain temperature measurement results at preset time intervals, and calculate a real-time theoretical wave velocity value of each cable segment based on the temperature measurement results and the theoretical wave velocity rated value; Normalization processing module, used to normalize the real-time value of the theoretical wave velocity of each cable segment and convert it into the wave velocity of the equivalent overhead line segment; The calculation module is further configured to obtain the wave head signals of the fault wave through two traveling wave measurement terminals located at both ends of the target power line in the event of a line fault, and calculate the wave head signal time difference between the wave head signals of the two fault waves; a fault location determination module, configured to determine a theoretical fault location based on the wave velocity of the equivalent overhead line section and the wave front signal time difference; The wave velocity correction module is used to obtain the actual fault location and correct the wave velocity of the equivalent overhead line section according to the actual fault location and the theoretical fault location.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

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

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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