T-connection power transmission line fault point positioning method and system based on traveling wave distance measurement

Abstract

The invention discloses a T-connection power transmission line fault point positioning method and system based on traveling wave distance measurement, and relates to the technical field of power transmission line fault positioning, and the method comprises the steps: obtaining the data of a fault point traveling wave reaching a multi-terminal device, and calculating the fault distance of each terminal device; a single-end and double-end distance measurement method is integrated, the combination relation between the fault distance and the T-connection power transmission line topology length is calculated, and an accurate fault branch is determined; and integrating various distance measurement results through an average algorithm, and calculating the comprehensive distance of the fault point. According to the method, the fault point is comprehensively judged by combining single-end and double-end traveling wave distance measurement methods, so that the positioning precision is improved, and errors are reduced; the problem of false fault points in a single-end distance measurement method is solved by comprehensively utilizing multi-end equipment information and through weight distribution and multi-source data fusion; the time mark information of the initial traveling wave and the reflected traveling wave is utilized, the advantages of single-end distance measurement and double-end distance measurement are combined, complementation of multiple methods is achieved, and the reliability and efficiency of fault positioning are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission line fault location, and in particular to a method and system for locating a fault point of a T-connected transmission line based on traveling wave ranging. Background Art

[0002] In modern power transmission systems, traveling wave ranging technology has gradually become an important means of transmission line maintenance due to its high efficiency and accurate fault location capabilities. Especially in T-connected transmission lines, due to their complex topological structure, the propagation paths of traveling waves become more diverse, making it more difficult to locate fault points. The traditional single-end traveling wave ranging method and double-end traveling wave ranging method measure the distance by measuring the time difference between the initial traveling wave and the reflected traveling wave and the time difference between the arriving traveling waves at both ends. However, when facing T-connected lines, these methods have certain limitations because they cannot accurately distinguish the traveling waves of multiple paths. Therefore, the comprehensive traveling wave ranging method combined with multi-point data has gradually become a research hotspot, striving to improve positioning accuracy and reliability.

[0003] The existing traveling wave ranging technology faces many challenges when dealing with faults on T-connected transmission lines. First, the single-end ranging method cannot effectively distinguish multiple possible traveling wave paths, resulting in the emergence of multiple pseudo-fault points, affecting the accuracy of fault location. Secondly, the dual-end ranging method relies on the synchronization of the two ends and has high requirements on the perfection of the dual-end data. Although its multi-end combination strategy attempts to improve the positioning accuracy, in actual applications, it often still has large errors due to factors such as electromagnetic interference and error accumulation, making it difficult to meet the needs of accurate positioning. In addition, the existing technology lacks special positioning correction means for the complex topological structure of the T-connected line, which may result in a significant deviation between the final ranging result and the actual fault point. Finally, the existing method has not yet formed a systematic fusion strategy for integrating information from different paths and different data sources, making it difficult to simultaneously use the advantages of single-end and dual-end ranging to effectively supplement and achieve more accurate and efficient fault location. Therefore, it is urgent to propose a new fault location method that can eliminate the above shortcomings. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problems solved by the present invention are: the existing traveling wave ranging method has the problem of multiple pseudo fault points, large error accumulation problem, and how to effectively combine single-end and double-end ranging technologies to achieve efficient and accurate fault location.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a method for locating a fault point of a T-connected transmission line based on traveling wave ranging, comprising obtaining data on the arrival of traveling waves at multiple terminals at the fault point and calculating the fault distance of each terminal device; combining single-end and double-end ranging methods to calculate the combined relationship between the fault distance and the topological length of the T-connected transmission line and determine the accurate fault branch; integrating multiple ranging results through an averaging algorithm to calculate the comprehensive distance of the fault point.

[0007] As a preferred solution of the T-connected transmission line fault point locating method based on traveling wave ranging described in the present invention, wherein: the multi-end device includes a left-end device, a right-end device and a branch-end device.

[0008] As a preferred solution of the T-connected transmission line fault point locating method based on traveling wave ranging described in the present invention, wherein: the acquisition of the data of the traveling wave reaching the multi-terminal devices at the fault point includes, according to the T-connected transmission line topology architecture, each device detects the traveling wave head time mark in real time, and triggers the device to obtain the traveling wave data of the initial traveling wave head time, the reflected traveling wave head time and the wave speed.

[0009] As a preferred solution of the T-connected transmission line fault point location method based on traveling wave ranging described in the present invention, wherein: the calculation of the fault distance of each end device includes calculating the single-end fault distance of each end device from the fault point based on the obtained traveling wave data of the traveling wave from the fault point reaching each end device in combination with the wave speed; based on the obtained traveling wave data generated by the fault point reaching the left end device, calculating the fault distance L1 of the left end device from the fault point, expressed as:

[0010]

[0011] Where v is the velocity of the reflected wave head, T A , T B They represent the time for the traveling wave to travel to and from the left-end device and the fault point, respectively, and L represents the total length of the line. Based on the data obtained when the traveling wave generated by the fault point reaches the right-end device, the fault distance L2 from the right-end device to the fault point is calculated, which is expressed as:

[0012]

[0013] Among them, T C , T D They represent the time for the traveling wave to travel to and from the right-end device and the fault point respectively; based on the data of the traveling wave generated by the fault point reaching the branch-end device, the fault distance L3 from the branch-end device to the fault point is calculated, which is expressed as:

[0014]

[0015] Among them, T E , T FThey respectively represent the time it takes for the traveling wave to travel to and from the branch end device and the fault point.

[0016] As a preferred solution of the T-connected transmission line fault point locating method based on traveling wave ranging described in the present invention, wherein: the calculation of the fault distance of each end device also includes calculating the fault distance L4 of the left end device from the fault point by using the two-end ranging method based on the acquired data of the traveling wave generated by the fault point reaching the left and right end devices, which is expressed as:

[0017]

[0018] Among them, T G , T H Respectively represent the time when the traveling wave reaches the left and right end devices; based on the data of the traveling wave generated by the fault point reaching the left and branch end devices, the fault distance L5 from the left end device to the fault point is calculated using the double-end distance measurement method, which is expressed as:

[0019]

[0020] Among them, T I , T J Respectively represent the time when the traveling wave reaches the left end and branch end equipment; based on the data of the traveling wave generated by the fault point reaching the right end and branch end equipment, the fault distance L6 from the right end equipment to the fault point is calculated using the double-end distance measurement method, which is expressed as:

[0021]

[0022] Among them, T K , T L They respectively represent the time it takes for the traveling wave to reach the devices at the right end and the branch end.

[0023] As a preferred solution of the T-connected transmission line fault point locating method based on traveling wave ranging described in the present invention, the determining of the accurate fault branch includes comparing the fault distances L1, L2, L3 of the equipment from the fault point with the lengths A1, B2, C2 of each equipment from the T node. If the length does not exceed the node length, the fault point occurs in the branch where the equipment that does not exceed the node length is located. If the length exceeds the node length, the fault point occurs in other branches. By comparing other branches, the accurate fault branch is comprehensively determined.

[0024] As a preferred solution of the T-connected transmission line fault point locating method based on traveling wave ranging described in the present invention, wherein: the calculation of the comprehensive distance of the fault point includes determining the first fault distance Z1 and the second fault distance Z2 from the left end device by the double-end ranging method based on the determined fault branch, using the fault distances L4, L5, L6 and the lengths A1, B2, C2 of each device from the T node; determining the third fault distance Z3, the fourth fault distance Z4 and the fifth fault distance Z5 from the left end device by the double-end ranging method using the fault distances L1, L2, L3 and the lengths A1, B2, C2 of each device from the T node; calculating the comprehensive fault distance of the real fault point from the left end device by the average algorithm, and calculating the comprehensive fault distance, which is expressed as:

[0025]

[0026] Among them, T g Indicates the comprehensive fault distance from the fault point to the left end device.

[0027] Another object of the present invention is to provide a T-connected transmission line fault point location system based on traveling wave ranging, which can solve the problem of large errors and false fault points in the current transmission line fault location technology by integrating multi-terminal ranging results through a comprehensive traveling wave ranging method.

[0028] As a preferred solution of the T-connected transmission line fault point positioning system based on traveling wave ranging described in the present invention, it includes: a data acquisition module, a branch judgment module, and a fault point positioning module; the data acquisition module is used to obtain the data of the traveling wave reaching the multi-terminal equipment at the fault point, and calculate the fault distance of each end device; the branch judgment module is used to integrate the single-end and double-end ranging methods, calculate the combined relationship between the fault distance and the topological length of the T-connected transmission line, and determine the accurate fault branch; the fault point positioning module is used to integrate multiple ranging results through an averaging algorithm to calculate the comprehensive distance of the fault point.

[0029] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of a method for locating a fault point of a T-connected power transmission line based on traveling wave ranging.

[0030] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for locating a fault point of a T-connected power transmission line based on traveling wave ranging.

[0031] Beneficial effects of the present invention: The T-connected transmission line fault point locating method based on traveling wave ranging provided by the present invention realizes comprehensive judgment of the fault point by combining single-end and double-end traveling wave ranging methods, which not only improves the positioning accuracy but also reduces the error; by comprehensively utilizing multi-end equipment information, through weight allocation and multi-source data fusion, the problem of pseudo fault points in the single-end ranging method is solved; by combining section relationships to trace the fault source, not only the accuracy of fault point positioning is ensured, but also maintenance personnel can be helped to troubleshoot the fault faster and more accurately; by utilizing the time scale information of the initial traveling wave and the reflected traveling wave, combining the advantages of the single-end ranging and the double-end ranging, the complementarity of multiple methods is realized, and the reliability and efficiency of fault location are improved; the method of the present invention is simple and suitable for engineering practice, and can be directly applied to fault detection of transmission lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0033] Figure 1 An overall flow chart of a method for locating a fault point of a T-connected transmission line based on traveling wave ranging provided in the first embodiment of the present invention.

[0034] Figure 2 A schematic diagram of T-connected line equipment layout of a T-connected transmission line fault point locating method based on traveling wave ranging provided in a second embodiment of the present invention.

[0035] Figure 3 An overall flow chart of a T-connected transmission line fault point locating system based on traveling wave ranging provided for the third embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0037] Example 1, reference Figure 1-Figure 2 , which is an embodiment of the present invention, provides a method for locating a fault point of a T-connected transmission line based on traveling wave ranging, comprising:

[0038] S1: Obtain the data of the traveling wave reaching multiple devices at the fault point and calculate the fault distance of each device.

[0039] Furthermore, the multi-end device includes a left-end device, a right-end device, and a branch-end device.

[0040] It should be noted that obtaining the data of the traveling wave reaching multiple devices at the fault point includes, according to the T-connected transmission line topology architecture, real-time detection of the traveling wave head time mark by each device, and triggering the device to obtain the traveling wave data of the initial traveling wave head time, the reflected traveling wave head time and the wave speed.

[0041] It should also be noted that the calculation of the fault distance of each end device includes calculating the single-end fault distance of each end device from the fault point based on the obtained traveling wave data of the traveling wave from the fault point reaching each end device in combination with the wave speed; and calculating the fault distance L1 of the left end device from the fault point based on the obtained traveling wave data of the traveling wave generated by the fault point reaching the left end device, which is expressed as:

[0042]

[0043] Where v is the velocity of the reflected wave head, T A , T B They represent the time for the traveling wave to travel to and from the left-end device and the fault point, respectively, and L represents the total length of the line. Based on the data obtained when the traveling wave generated by the fault point reaches the right-end device, the fault distance L2 from the right-end device to the fault point is calculated, which is expressed as:

[0044]

[0045] Among them, T C , T D They represent the time for the traveling wave to travel to and from the right-end device and the fault point respectively; based on the data of the traveling wave generated by the fault point reaching the branch-end device, the fault distance L3 from the branch-end device to the fault point is calculated, which is expressed as:

[0046]

[0047] Among them, T E , T F They respectively represent the time it takes for the traveling wave to travel to and from the branch end device and the fault point.

[0048] It should also be noted that the calculation of the fault distance of each end device also includes calculating the fault distance L4 of the left end device from the fault point using the two-end distance measurement method based on the data of the traveling wave generated by the fault point reaching the left and right end devices, which is expressed as:

[0049]

[0050] Among them, T G , T HRespectively represent the time when the traveling wave reaches the left and right end devices; based on the data of the traveling wave generated by the fault point reaching the left and branch end devices, the fault distance L5 from the left end device to the fault point is calculated using the double-end distance measurement method, which is expressed as:

[0051]

[0052] Among them, T I , T J Respectively represent the time when the traveling wave reaches the left end and branch end equipment; based on the data of the traveling wave generated by the fault point reaching the right end and branch end equipment, the fault distance L6 from the right end equipment to the fault point is calculated using the double-end distance measurement method, which is expressed as:

[0053]

[0054] Among them, T K , T L They respectively represent the time it takes for the traveling wave to reach the devices at the right end and the branch end.

[0055] It should also be noted that calculating the distance between each device and the fault point can preliminarily locate the fault location and lay a data foundation for accurately locating the fault point. This step of calculation provides sufficient accurate data and improves the accuracy and efficiency of the overall system.

[0056] S2: Combine the single-end and double-end distance measurement methods to calculate the combined relationship between the fault distance and the topological length of the T-connected transmission line and determine the exact fault branch.

[0057] Furthermore, determining the exact fault branch includes comparing the fault distances L1, L2, L3 of the device from the fault point with the lengths A1, B2, C2 of each device from the T node. If the length does not exceed the node length, the fault point occurs in the branch where the device that does not exceed the node length is located. If the length exceeds the node length, the fault point occurs in other branches. By comparing other branches, the exact fault branch is comprehensively determined.

[0058] It should be noted that by combining the single-end and double-end ranging methods, the position of the fault branch can be determined more comprehensively and accurately, and the accuracy of fault point positioning is improved by utilizing a combination of multiple ranging methods; the specific branch to which the fault point belongs is determined based on the measured distance information and the relative position of the equipment, and by comparing the distance information on different branches, impossible fault paths are eliminated and the real fault branch is locked. While making up for the defects of a single method, multi-source information is used to improve the accuracy and reliability of fault diagnosis.

[0059] S3: Integrate multiple distance measurement results through an averaging algorithm to calculate the comprehensive distance to the fault point.

[0060] Furthermore, calculating the comprehensive distance of the fault point includes determining the first fault distance Z1 and the second fault distance Z2 from the left end device by a double-terminal distance measurement method based on the determined fault branch, using the fault distances L4, L5, L6 and the lengths A1, B2, C2 of each device from the T node; determining the third fault distance Z3, the fourth fault distance Z4 and the fifth fault distance Z5 from the left end device by a double-terminal distance measurement method by using the fault distances L1, L2, L3 and the lengths A1, B2, C2 of each device from the T node; calculating the comprehensive fault distance of the real fault point from the left end device by an average algorithm, and calculating the comprehensive fault distance, which is expressed as:

[0061]

[0062] Among them, T g Indicates the comprehensive fault distance from the fault point to the left end device.

[0063] It should be noted that by applying the averaging algorithm and integrating the results of multiple distance measurement methods, it is helpful to reduce the error caused by a single measurement. By combining the distance measurement information of multiple devices, the comprehensive fault distance of the fault point relative to a reference device is calculated, taking into account the weights and accuracy of different distance measurement methods, ensuring the rationality of the final fault distance.

[0064] Embodiment 2 is an embodiment of the present invention, which provides a method for locating a fault point of a T-connected transmission line based on traveling wave ranging. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0065] First, this embodiment aims to verify the effectiveness of the fault point locating method of a T-connected transmission line based on traveling wave ranging. The experiment is carried out in a simulated environment of a T-connected transmission line with a line length of 5,000 meters, including left-end equipment, right-end equipment and branch-end equipment. During the experimental preparation stage, all equipment is installed and calibrated. The equipment has the function of automatically detecting the traveling wave head, and has the ability to record the traveling wave time, reflected traveling wave time and wave velocity.

[0066] The first step of the experiment is to introduce the fault point. The fault point is set at a position 3500 meters away from the left end device, and the traveling wave is stimulated by inducing a fault signal. The device receives the traveling wave information and records it. Next, based on the collected data, the preliminary distance between each device and the fault point is calculated. In order to achieve higher ranging accuracy, the two-end ranging method is used to verify the data. After obtaining the arrival time of the traveling wave at the branch end, the two-end ranging method is combined with the preliminary ranging result to recalculate the final distance. After comprehensive calculation and adjustment, the comprehensive distance of the fault point is obtained by the average algorithm. The experimental data is shown in Table 1 below.

[0067] Table 1 Experimental data of each terminal equipment

[0068]

[0069] From the analysis of experimental data, it can be seen that the method based on traveling wave ranging of the present invention has obvious advantages. First, when the left-end device does not use the comprehensive algorithm, the distance of 3000m obtained is somewhat different from the actual fault distance of 3500m. After combining the traveling wave propagation speed and reflection time and correcting it by the two-end ranging method, the final ranging result is 3580m, which is close to the actual fault point location.

[0070] In summary, it can be seen that the present invention not only improves the accuracy of ranging by using single-end and double-end ranging methods, but also realizes the effective integration of data of devices at different locations, indicating that compared with the traditional single ranging method that is prone to large errors in complex line conditions, the method of the present invention achieves the effect of reducing errors through multi-faceted data collection and analysis.

[0071] Example 3, reference Figure 3 , which is an embodiment of the present invention, provides a T-connected transmission line fault point location system based on traveling wave ranging, including a data acquisition module, a branch judgment module, and a fault point location module.

[0072] The data acquisition module is used to obtain the data of the traveling wave reaching the multi-terminal devices at the fault point and calculate the fault distance of each terminal device; the branch judgment module is used to integrate the single-end and double-end distance measurement methods, calculate the combined relationship between the fault distance and the topological length of the T-connected transmission line, and determine the accurate fault branch; the fault point positioning module is used to integrate multiple distance measurement results through an averaging algorithm to calculate the comprehensive distance of the fault point.

[0073] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0074] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0075] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0076] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for locating fault points of T-connected transmission lines based on traveling wave ranging, characterized in that: include: Obtain the data of the traveling wave reaching multiple devices at the fault point and calculate the fault distance of each device; Combining single-end and double-end distance measurement methods, the combined relationship between fault distance and T-connected transmission line topology length is calculated to determine the exact fault branch; The comprehensive distance to the fault point is calculated by integrating multiple distance measurement results through an averaging algorithm.

2. The method for locating a fault point of a T-connected power transmission line based on traveling wave ranging according to claim 1, characterized in that: The multi-end device includes a left-end device, a right-end device and a branch-end device.

3. The method for locating a fault point of a T-connected transmission line based on traveling wave ranging according to claim 2, characterized in that: The method of obtaining the data of the traveling wave reaching the multi-terminal devices at the fault point includes, according to the T-connected transmission line topology architecture, each device detects the traveling wave head time mark in real time, and triggers the device to obtain the traveling wave data of the initial traveling wave head time, the reflected traveling wave head time and the wave speed.

4. The method for locating a fault point of a T-connected power transmission line based on traveling wave ranging as claimed in claim 3, characterized in that: The calculation of the fault distance of each end device includes calculating the single-end fault distance of each end device from the fault point in combination with the wave speed according to the travel wave data of the fault point travel wave reaching each end device; Based on the data of the traveling wave generated by the fault point reaching the left-end device, the fault distance L1 from the left-end device to the fault point is calculated, which is expressed as: Where v is the velocity of the reflected wave head, T A , T B They represent the time it takes for the traveling wave to travel to and from the left-end device and the fault point, respectively, and L represents the total length of the line; Based on the data of the traveling wave generated by the fault point reaching the right-end device, the fault distance L2 from the right-end device to the fault point is calculated, which is expressed as: Among them, T C , T D Respectively represent the time it takes for the traveling wave to travel to and from the right-end device and the fault point; Based on the acquired data of the traveling wave generated by the fault point reaching the branch-end device, the fault distance L3 from the branch-end device to the fault point is calculated, which is expressed as: Among them, T E , T F They respectively represent the time it takes for the traveling wave to travel to and from the branch end device and the fault point.

5. The method for locating a fault point of a T-connected power transmission line based on traveling wave ranging according to claim 4, characterized in that: The calculation of the fault distance of each end device also includes calculating the fault distance L4 of the left end device from the fault point using a two-end distance measurement method based on the acquired data of the traveling wave generated by the fault point reaching the left end and the right end device, which is expressed as: Among them, T G , T H Respectively represent the time it takes for the traveling wave to reach the left and right devices; Based on the data of the traveling wave generated by the fault point reaching the left-end and branch-end equipment, the fault distance L5 from the left-end equipment to the fault point is calculated using the double-end distance measurement method, which is expressed as: Among them, T I , T J They represent the time when the traveling wave reaches the left-end and branch-end devices respectively; Based on the data of the traveling wave generated by the fault point reaching the right-end and branch-end equipment, the fault distance L6 from the right-end equipment to the fault point is calculated using the double-end distance measurement method, which is expressed as: Among them, T K , T L They respectively represent the time it takes for the traveling wave to reach the devices at the right end and the branch end.

6. The method for locating a fault point of a T-connected power transmission line based on traveling wave ranging according to claim 5, characterized in that: The method of determining the accurate fault branch includes comparing the fault distances L1, L2, and L3 of the device from the fault point with the lengths A1, B2, and C2 of each device from the T node. If the length does not exceed the node length, the fault point occurs in the branch where the device that does not exceed the node length is located. If the length exceeds the node length, the fault point occurs in other branches. By comparing other branches, the accurate fault branch is comprehensively determined.

7. The method for locating a fault point of a T-connected power transmission line based on traveling wave ranging according to claim 6, characterized in that: The calculation of the comprehensive distance of the fault point includes determining the first fault distance Z1 and the second fault distance Z2 from the left end device by a double-end distance measurement method based on the determined fault branch and using the fault distances L4, L5, L6 and the lengths A1, B2, C2 of each device from the T node; Using the fault distances L1, L2, L3 and the lengths A1, B2, C2 of each device from the T node, the third fault distance Z3, the fourth fault distance Z4, and the fifth fault distance Z5 from the left end device are determined by the double-end ranging method; The average algorithm is used to calculate the comprehensive fault distance between the real fault point and the left-end device, and the comprehensive fault distance is calculated, which is expressed as: Among them, T g Indicates the comprehensive fault distance from the fault point to the left end device.

8. A system using the method for locating a fault point of a T-connected power transmission line based on traveling wave ranging as claimed in any one of claims 1 to 7, characterized in that: Including data acquisition module, branch judgment module, fault point location module; The data acquisition module is used to obtain the data of the traveling wave of the fault point reaching multiple end devices and calculate the fault distance of each end device; The branch judgment module is used to combine the single-end and double-end distance measurement methods, calculate the combined relationship between the fault distance and the topological length of the T-connected transmission line, and determine the accurate fault branch; The fault point location module is used to integrate multiple distance measurement results through an average algorithm to calculate the comprehensive distance of the fault point.

9. 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 for locating a fault point of a T-connected transmission line based on traveling wave ranging as described in any one of claims 1 to 7 are implemented.

10. 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 for locating a fault point of a T-connected transmission line based on traveling wave ranging as described in any one of claims 1 to 7 are implemented.

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