89 results about "Cable fault location" patented technology

The invention relates to the technical field of cable asset management and fault prediction, and discloses a cable fault positioning method based on deep learning clustering analysis test waveform characteristics, and the method comprises the steps: collecting waveform and environment data in a cable operation period, and constructing a historical feature library comprising waveform, environment and position features; a self-adaptive detection model is adopted, and parameters are dynamically adjusted to adapt to different working conditions; multi-dimensional feature fusion and matching analysis are combined; a fault point distance is calculated through a signal propagation model and a time difference positioning algorithm, precise positioning is realized by fusing environment compensation and multi-point cross validation, and a three-dimensional geographic coordinate is generated by combining a laying path; and after multiple verifications, a structured report containing a fault type, a risk level, a prediction position, confidence and operation and maintenance suggestions is generated. According to the system, intelligent monitoring, fault risk prediction, asset optimization management and operation and maintenance decision support of a cable operation state are realized, and scientificity and economy of cable management in a complex environment are improved.

The invention relates to the technical field of cable fault positioning, in particular to a cable fault accurate positioning method based on multi-channel synchronous acquisition, which comprises the following steps: S1, constructing a multi-channel adaptive acquisition system which comprises a main controller, a multi-channel acquisition module, a synchronous control module and a data transmission module; s2, multi-channel data synchronous acquisition is carried out through the synchronous control module, wherein the multi-channel data comprises impedance data, temperature data, partial discharge signals and insulation resistance data; during use, through a multi-channel adaptive acquisition design, monitoring channels can be flexibly selected according to cable materials, operation years and environmental conditions, different aging fault characteristics are comprehensively covered, the fault omission ratio and the false alarm rate are reduced, different types of low-voltage cables are adapted, a synchronous scheme of constant-temperature crystal oscillator and hardware triggering is adopted, and the reliability of the system is improved. The method does not need to depend on a GPS / PTP time service module, is favorable for saving cost input, and eliminates environmental interference and single parameter false triggering.

According to the cable fault positioning system based on multi-detection node data fusion, integration of early warning and accurate positioning of cable faults is achieved through multi-node cooperative monitoring and data fusion, a partial discharge feature recognition and pulse reflection joint detection mechanism is adopted, a signal propagation speed compensation model and a multi-source data optimization algorithm are combined, and the cable fault positioning accuracy is improved. The limitation of a single detection node is effectively overcome, the accuracy and reliability of fault positioning are remarkably improved, and the fault finding time and the power failure loss are reduced.

The invention discloses a graphical fault distance measurement method and system, relates to the field of traction substation tripping fault mark distance measurement in the railway industry, and can read a fault report of a fault distance measurement device and constant value parameter configuration of the fault distance measurement device off line, and calculate and analyze a fault type, whether line current is balanced or not and a fault distance according to the data and parameters. And a result is graphically displayed, so that the distance measurement error range can be narrowed by modifying and verifying the constant value parameters, and the corrected constant value parameters are exported and stored, thereby achieving the purposes of facilitating fault analysis, improving the working efficiency and shortening the maintenance time. Maintenance personnel are helped to quickly find out fault points, timely process faults and recover normal operation of lines, and the method is very important for safe, reliable and efficient transportation of a railway system.

The utility model discloses an urban planning underground comprehensive pipe gallery which comprises a pipe gallery body, and multiple layers of cable supporting assemblies are installed on installation base plates on the two sides in a combined mode. The beneficial effects of the utility model are that the supporting seat of the cable supporting assembly is in sliding fit with the U-shaped clamping seat, and the limiting rod is in longitudinal sliding fit with the limiting hole, so that the supporting seat can be detachably and transversely combined at the side position of the pipe gallery body; meanwhile, after the limiting rods are longitudinally separated from the limiting holes, the supporting seats can vertically slide downwards and be separated from the U-shaped clamping seats, so that the supporting seats can be detached from the side positions of the pipe gallery body, and the combination and detachment modes of the supporting seats on the side positions of the pipe gallery body are simple and easy to achieve; the supporting seat can be conveniently and rapidly combined on the side portion of the pipe gallery body to carry and support the cable, meanwhile, the fault position of the cable can be smoothly exposed after the supporting seat is conveniently and rapidly detached from the lower portion of the cable subsequently, and the cable can be conveniently overhauled and maintained.

The application discloses a fault distance measurement method and system based on synchronous sampling of power distribution terminals, relates to the related technical field of fault distance measurement, and comprises the following steps: acquiring transient electrical quantity data synchronously sampled by multiple power distribution terminals after a fault of a power system; constructing a dynamic graph structure with the power distribution terminals as nodes and electrical connection relationships as edges according to real-time network topology information, inputting the transient electrical quantity data into a phase sequence disorder correction model to correct phase sequence disorder and extract spatial fault features; fusing zero-mode components of the transient electrical quantity data and node enhanced features; globally aggregating the fusion features of the nodes to obtain graph-level fusion features, extracting timing features, and regressing to obtain a fault distance. The application solves the technical problem that, in the prior art, it is difficult to fully utilize multi-source transient information to perform high-precision fault distance measurement in a complex power distribution network environment with dynamic topology and phase sequence disorder, and achieves the technical effects of improving fault distance measurement precision and adaptability to complex power distribution network environments.

The invention discloses a fault distance measurement method and system based on power distribution terminal synchronous sampling, and relates to the technical field of fault distance measurement, and the method comprises the steps: obtaining the transient electrical quantity data of a plurality of power distribution terminals synchronously sampled after a power system has a fault; according to the real-time network topology information, a dynamic graph structure with the power distribution terminal as a node and the electrical connection relation as an edge is constructed, transient electrical quantity data is input into a phase sequence disorder correction model to correct phase sequence disorder, and space fault features are extracted; extracting a zero-mode component of the transient electrical quantity data and performing node enhancement feature fusion; globally aggregating the fusion features of the nodes to obtain graph-level fusion features, and extracting time sequence features and performing regression to obtain a fault distance. The technical problem that in the prior art, it is difficult to fully utilize multi-source transient information to conduct high-precision fault distance measurement in the complex power distribution network environment with topology dynamic change and phase sequence disorder is solved, and the technical effect of improving the fault distance measurement precision and the adaptability to the complex power distribution network environment is achieved.

The application discloses a fault ranging method in a 1-2 mode of a traction power supply system feeder breaker, relates to the technical field of electrified railway traction power supply, and converts the uplink and downlink feeder currents of a traction substation by means of the cross-link current of an AT substation and a partition substation, so that the first fault interval from the traction substation to the AT substation can also be subjected to fault ranging by the fault ranging principle of the cross-link current ratio method. The method simultaneously considers the difference between type I and type II substation, and the fault ranging precision of the first fault interval can be improved by using the method, the ranging error is controlled within a range of 250 meters, the fault point can be quickly positioned by operation and maintenance personnel when a fault occurs, the fault is timely disposed and the line is recovered to normal operation, and the method has important significance for guaranteeing the safe, stable and efficient operation of a railway transportation system.

The invention discloses a fault location method and system based on adaptive scale wavelets, and the method comprises the steps: carrying out the discretization of a preset wavelet basis, and generating an adaptive scale wavelet library; based on the wavelet of each scale in the wavelet library, single-layer discrete wavelet decomposition is carried out on the independent fault signal, and a high-frequency coefficient corresponding to each scale is extracted; calculating a corresponding energy-entropy comprehensive evaluation index based on the high-frequency coefficient corresponding to each scale; and determining an optimal scale based on the energy-entropy comprehensive evaluation index, and carrying out fault distance measurement and calculation through the optimal scale. According to the fault distance measurement method and system based on the adaptive scale wavelet provided by the technical scheme of the invention, rapid and accurate fault location distance measurement is realized.

The invention relates to the technical field of cable fault positioning, in particular to a cable fault accurate positioning method and system for cable health monitoring, and the method comprises the steps: obtaining a collection reflection section and an experiment reflection section; obtaining the matching degree of the experimental reflection section; other parameters except the noise intensity in the experiment parameter group are constant, and the noise intensity is quantitatively analyzed to obtain the comprehensive matching degree of the collection reflection section and the experiment reflection section; screening the parameter groups to obtain a plurality of matching parameter groups and a reflection initial search range; comprehensively analyzing the probability that the correlation degree of the reflected pulse signal and the matching parameter group reflects each moment as the starting moment, and selecting the starting moment of the reflected pulse signal; and obtaining the distance of the fault point by using the starting time of the reflected pulse signal. The invention aims to solve the interference of noise on the starting moment of the reflected pulse signal and improve the accuracy of the time domain reflection method.

The application discloses a kind of track train cable fault location's travelling wave signal denoising method and system, it is related to track train cable fault detection technical field.Wherein, the method includes: the original travelling wave signal generated by track train cable fault is collected;Wherein, original travelling wave signal includes the incident wave and reflected wave generated by fault point;Original travelling wave signal is preprocessed, removes direct current component, low-frequency noise and irrelevant interference component in signal, obtains the travelling wave signal after preprocessing;The travelling wave signal after preprocessing is input into VMD algorithm of variation modal decomposition, and the intrinsic mode decomposition is carried out to travelling wave signal, obtains multiple intrinsic mode components;Improved particle swarm optimization algorithm IPSO is introduced, and the optimal signal decomposition effect is used as objective function, and the key parameters of VMD algorithm are iteratively optimized, and the optimal parameter combination is obtained.The application solves the problems of insufficient denoising effect, signal waveform distortion and limited noise resistance in the prior art.

The invention belongs to the technical field of aviation cable fault positioning, and particularly relates to a cable fault positioning method based on time-frequency domain analysis, which comprises the following steps: firstly, collecting a cable fault signal, adopting a GWO-VMD algorithm, taking a minimum sample entropy as a fitness function, and optimizing to find an optimal penalty factor and decomposition layer number, so as to obtain a fault positioning result; removing a high noise component obtained by VMD decomposition according to the current sample entropy, and obtaining a reflected signal after noise reduction; performing cross term suppression on the reflected signal after noise reduction by using smooth pseudo Wigner distribution to obtain discrete SPWVD; and performing blind area elimination on the discrete SPWVD based on a blind area elimination algorithm of hypothesis verification to obtain a fault distance. A grey wolf optimization algorithm is applied to a variational mode decomposition algorithm, and parameters of decomposition layers and penalty factors of the VMD are optimized, so that the problem of interference of noise on reflection signal extraction is solved; secondly, the smooth pseudo Wigner distribution is adopted to solve the problem of cross term interference among a plurality of linear components in the traditional WVD distribution, and the positioning precision is improved.

The invention relates to the technical field of intelligent operation and maintenance of power equipment, and discloses a distributed photovoltaic cable fault positioning device which comprises a fault positioning instrument body, a shielding shed, a lifting mechanism and a linkage lock. The fault positioning instrument body is composed of two hinged semi-cylindrical shells, and a monitoring circuit is integrated in the fault positioning instrument body. The shielding shed is fixed on the aerial cable through a hoop to serve as a resident base station. The lifting mechanism is arranged in the shielding shed, and a reel and a traction rope are driven by a motor, so that the ground vertical lifting of the fault locator main body is realized. The core innovation lies in mechanical logic control of the lock, wherein a one-way rigid shifting plate mechanism automatically triggers a lock cylinder to retract and unlock when a reel rotates reversely, and automatic locking is achieved through mechanical extrusion and spring reset when a shell ascends in place. The mode that traditional equipment needs to climb a tower for maintenance is thoroughly changed, operation and maintenance personnel can complete equipment overhaul on the ground, and the method has the remarkable advantages that power failure is not needed, intrinsic safety is achieved, and the maintenance cost is extremely low.

The invention discloses a single fault point distance measurement method based on a reflection coefficient spectrum period, and relates to the technical field of fault detection, and the method comprises the specific steps: 1, constructing a model, and building an incidence relation; 2, determining the frequency range and bandwidth of frequency sweeping; 3, collecting data and constructing a smooth interpolation curve; 4, detecting feature points to obtain a phase coefficient value; 5, calculating a period and solving a fault distance; according to the method, the improved reflection coefficient spectrum model integrated with the cable basic parameters is constructed, the correlation between the period and the fault distance is established, interference of a traditional method is avoided, the near-area fault distance measurement problem is solved, and accuracy and adaptability are improved; and meanwhile, data is processed by adopting segmented cubic spline interpolation, fuzzy feature points are eliminated, redundancy check of three cycle calculation modes is designed, the anti-interference capability is enhanced, the fault distance is stably output in signal attenuation and noise interference scenes, and the reliability and consistency of a distance measurement result are guaranteed.

This invention discloses a fault location method for a traction power supply system feeder circuit breaker in a 1-to-2 mode, relating to the field of electrified railway traction power supply technology. By converting the cross-connecting current between the AT substation and the section substation into the up and down feeder currents of the traction substation, the first fault interval from the traction substation to the AT substation can also be located using the cross-connecting current ratio method. This method also considers the differences between Type I and Type II substations. Using this method can improve the fault location accuracy of the first fault interval, controlling the location error within 250 meters. This ensures that maintenance personnel can quickly locate the fault point, promptly handle the fault, and restore normal line operation when a fault occurs, which is of great significance for ensuring the safe, stable, and efficient operation of the railway transportation system.

The invention discloses a fault distance measurement method and system for a direct-current transmission line, and the method comprises the steps: obtaining the initial fault traveling wave arrival time and the fault point reflection wave arrival time of measurement points at two ends of the direct-current transmission line when the direct-current transmission line triggers fault distance measurement; according to the initial fault traveling wave arrival time and the fault point reflected wave arrival time, calculating the arrival time difference between the initial fault traveling wave and the fault point reflected wave of the measurement points at the two ends, and calculating the distance between the measurement points at the two ends and the fault point based on the time difference between the measurement points at the two ends; the time difference of the measuring points is calculated according to the distance between the measuring points at the two ends and the fault point, strict clock synchronization of the measuring points at the two ends is not needed, calculation does not need to depend on the wave speed, and therefore the fault distance measurement accuracy of the direct-current power transmission line is effectively improved.

This invention specifically relates to a fault location method for distribution lines based on a primary and secondary integrated pole-mounted circuit breaker, falling within the field of distribution line fault detection and location technology. The method includes: after the primary and secondary integrated circuit breaker detects a line fault and trips, it classifies the fault type using edge computing, blocks conventional reclosing, and completes hardware reset and line parameter preloading before distance measurement. In this invention, the phase-selective closing function of the primary and secondary integrated circuit breaker actively injects a standardized high-frequency transient excitation signal, avoiding the randomness problem of the traditional traveling wave method relying on natural fault traveling waves, thus improving the signal-to-noise ratio and feature saliency of the transient signal. Simultaneously, the core of the distance measurement relies on the transient oscillation frequency, which is dominated by the line inductance and capacitance and minimally affected by high-resistance grounding resistance, naturally adapting to high-resistance fault scenarios. Furthermore, the Prony algorithm's accurate extraction of transient parameters and iterative correction strategy for transition resistance solve the problem of large errors in high-resistance scenarios using traditional impedance methods.

This invention provides a method and system for high-voltage cable fault location monitoring based on environmental factor coupling, belonging to the field of cable monitoring technology. The method specifically involves: establishing a coupling relationship between environmental factors based on historical cable operation data and corresponding historical environmental parameters, mapping multidimensional environmental data along the cable line to corresponding equivalent environmental parameters; identifying abnormal cable operation events based on the equivalent environmental parameters and cable status information, and obtaining the corresponding initial fault location; determining the environmental coupling weights of each distributed measuring point using fuzzy inference and inverse distance weighting, thereby correcting the initial fault location; and outputting cable status early warning information based on the event identification results. This invention establishes a coupling relationship to map multidimensional environmental parameters to equivalent environmental parameters, and combines dynamic weights generated by fuzzy inference and inverse distance weighting to achieve adaptive correction of the location results to environmental changes and signal quality differences, thereby improving its accuracy.

The invention discloses a cable distribution parameter model construction and wave process analysis method, and relates to the technical field of the power industry, and the method comprises the steps: analyzing a cable structure to determine the hierarchy of the cable structure; constructing a distributed parameter model composed of unit length resistance, inductance, conductance and capacitance according to the ratio of the wavelength of the traveling wave to the length of the cable; an equation set is listed based on the Kirchhoff's law, and a transmission line partial differential equation describing the electromagnetic transmission characteristics of the cable is deduced; a refraction and reflection rule of traveling waves in a cable is analyzed, voltage and current refraction and reflection coefficients are deduced to determine traveling wave propagation behaviors, and in addition, time domain traveling wave fault distance measurement, fault distance measurement based on an improved head end reflection coefficient spectrum and insulation defect online monitoring based on active signal injection can be achieved in an extending mode. The method can eliminate the periodic distortion of the traditional frequency domain reflection spectrum, improves the fault distance measurement precision, achieves the real-time monitoring of the insulation state, and guarantees the safe and stable operation of the cable.

The application discloses a fault positioning method for an AT single-wire power supply system, which collects analog quantity information of key nodes through an existing fault distance measurement system in each building, first judges the fault type through the T-line current and the F-line current in each building, then checks and normalizes the key analog quantity data, and finally calculates the fault distance according to the core algorithm of the fault positioning method of the AT single-wire power supply system, and supports the correction of the fault distance by adjusting the line impedance parameters after the distance measurement result is obtained. The method can accurately realize the fault positioning of the AT single-wire power supply system, greatly improves the accuracy compared with the conventional on-load current ratio method, and has certain engineering applicability, thereby providing a thought for the future fault of the AT single-wire power supply system.

The invention discloses a fault traveling wave fault location method, device and system suitable for a power distribution network. According to the method, relative time deviation between monitoring terminals is obtained through a system calibration stage, virtual synchronization is achieved through deviation compensation in a fault distance measurement stage, then accurate distance measurement is conducted through a double-end traveling wave method, and fault branches are verified and recognized through cooperation of multiple slave stations. The system comprises a master station monitoring terminal, a slave station monitoring terminal and a data processing center, and terminal equipment does not need a high-precision synchronous clock, so that the system cost is greatly reduced. The method effectively solves the technical problems of multiple branches, weak signals, difficult synchronization and the like in traveling wave distance measurement of the power distribution network, has the advantages of low cost, high precision and strong adaptability, and is suitable for accurate fault positioning of the power distribution network of various topological structures.

The invention relates to the technical field of cable detection, in particular to a high-voltage cable fault positioning device which comprises an installation unit provided with a first channel penetrating along the central axis of the installation unit so that the installation unit can be connected to the outer side of a cable in a sleeving mode, and a fixing unit installed at the end of the installation unit and provided with a second channel penetrating along the central axis of the installation unit so that the cable can be sleeved with the second channel. The first channel and the second channel are communicated and form a main channel, the rotating unit is installed at the end of the installation unit, the installation unit can be driven by the rotating unit to rotate around the central axis of the installation unit so that the first channel can rotate, the rotating speed of the installation unit can be adjusted, and the speed control unit comprises a walking unit. The walking unit can drive the main channel to axially move along the outer side of the cable, the rotating unit drives the troubleshooting unit to rotate along the outer side of the cable to perform fault detection, the troubleshooting unit is provided with a sensor, complete-cycle coverage acquisition is completed along with rotating action, and complete-cycle detection of the cable is achieved.

The invention relates to a cable fault distance measurement method and device based on bandwidth quantization and generalized orthogonal integration, and the method comprises the steps: obtaining a cable head end reflection coefficient spectrum based on a phase shift parameter; according to the phase shift parameter-based cable head end reflection coefficient spectrum and an orthogonal integral principle, constructing a fault distance measurement function, and based on a preset constraint condition, constraining curve characteristics of the fault distance measurement function to obtain a sweep frequency bandwidth quantization relation; and obtaining a cable fault distance result based on the sweep frequency bandwidth quantization relation and the fault distance measurement function, thereby solving the problem of low fault distance measurement efficiency caused by the characteristics of overlarge sweep frequency bandwidth and overhigh test frequency in related technologies, and improving the efficiency of cable fault distance measurement on the premise of ensuring the distance measurement precision.

The invention provides a converter-based charge cable fault positioning method, which is characterized in that in-situ fault identification is realized based on an original measurement link of a piezoelectric sensor, a small high-frequency charge cable and a charge converter, and a plurality of fault modes of the charge cable are obtained through characteristic analysis of an output waveform of the charge converter. And a fault point can be positioned through a method of measuring the capacitance of the cable in an open circuit mode, so that the problem of cable fault positioning for long-distance transmission of charge signals in a narrow space is solved.

The invention provides a multi-channel multi-timestamp module for cable fault positioning and a timestamp generation method, relates to the technical field of cable fault monitoring, and aims to solve the problems that in existing cable fault positioning, the timestamp precision is limited by the ADC sampling rate, multi-channel high-precision synchronization is difficult to realize, the cost is high, and the reliability is high. And time feature extraction under a low signal-to-noise ratio signal is easy to interfere. The system comprises a field programmable gate array, wherein a clock synchronization module, a timestamp generation module, a timestamp register module, a UART communication module and a control management module are integrated in the field programmable gate array; the timestamp generation module comprises a plurality of independent event trigger input channels, the timestamp register module is in line connection with the timestamp generation module, the UART communication module is in communication connection with the timestamp register module and external equipment, and the control management module is in line connection with other modules. According to the method, the problems in the prior art are solved, and the timestamp precision and the cable fault positioning precision are improved.

The invention discloses a simulation-based power transmission line fault distance measurement method and system, and the method comprises the steps: building a power transmission line simulation model according to the parameters of a power transmission line, setting 1-N fault positions in the power transmission line simulation model, collecting the time difference of the initial fault traveling wave of each fault position reaching the measurement points at the two ends of the power transmission line simulation model, and calculating the fault distance of the power transmission line. Data fitting is carried out according to each fault position and the time difference, and the fault position of the fault power transmission line is obtained based on the time difference of the fault power transmission line according to the function relation, so that dependence on the traveling wave velocity is not needed, fault distance measurement errors caused by the fixed wave velocity adopted by a double-end traveling wave distance measurement method are reduced, and the fault distance measurement accuracy is improved. According to the method, accurate positioning of the fault position of the faulty power transmission line can be realized only by inputting the moment difference of the initial fault traveling wave reaching the measurement points at the two ends of the faulty power transmission line during fault distance measurement based on the function relationship of the fault position and the moment difference obtained by multiple simulation fitting, so that the accuracy of fault distance measurement of the power transmission line is effectively improved.

The present application relates to a double-ended DC power transmission fault location method, system, storage medium and computer, the method first uses the energy structure characteristics of current signal to construct high sensitivity starting criterion, accurately records the fault time. Secondly, based on the voltage and current data before and after the fault time, the first modal counter-traveling voltage wave is extracted, and the method of Laguerre orthogonal matrix fitting combined with Hilbert transform is used for accurate denoising, and the noise interference is effectively filtered out. Then, the Bergeron time domain equivalent model of the double-ended DC power transmission system containing frequency variable loss is constructed, the denoised counter-traveling voltage wave is taken as the excitation, and the time domain fault voltage signal is solved. Finally, based on the fault voltage signal, the weighted energy density spatial distribution function is constructed, and the two-stage iterative search strategy is adopted to accurately locate the fault point. The present application has strong anti-interference ability, high location accuracy, and is not affected by the transition resistance.

The application provides a cable fault positioning device and method based on analog latch and vector fingerprint, and relates to the technical field of cable fault monitoring, which comprises an electromagnetic sensing module, a detection of electromagnetic traveling wave and a generation of a first trigger signal when the change rate is over the threshold value; an analog time latch module, a response to the first trigger signal timing and information recording; a vector fingerprint checking module, a collection of vibration signals and a generation of a second trigger signal according to the checking criteria; a master control and communication module, a response to the second trigger signal to wake up, a reading of the timing information to determine the time backtracking amount, a combination of the sound wave arrival time to calculate the real time difference, and a calculation of the fault distance according to the corrected sound velocity and a sending of the result. The beneficial effect eliminates the influence of the MCU wake-up delay on the time reference through the analog time latch, provides a reliable basis for high-precision ranging, and greatly reduces the false positive rate by using the vector fingerprint checking criteria to distinguish the radial shock wave from the external interference, thereby saving the energy consumption and communication resources.

The present disclosure relates to the technical field of electrified railway traction power supply, and provides a fault location method and system using reclosing current of an AT traction network. The method comprises: when a reclosing operation is detected, obtaining circuit parameters of a target rail, a target contact line and a target negative feeder after reclosing, and determining whether a permanent short-circuit fault occurs in the target AT traction network; in the case where it is determined that a permanent short-circuit fault occurs, determining a fault type of the permanent short-circuit fault according to the circuit parameters; and calculating a short-circuit fault distance corresponding to the fault type according to a preset calculation strategy, the fault type and the target parameters. The present disclosure can greatly improve the accuracy and practicability of short-circuit fault location.

This invention discloses an artificial intelligence-based intelligent management system and method for remote monitoring of power grids, relating to the field of transmission line fault location technology. The method includes: acquiring fault traveling wave waveform data; extracting the first rise time, second rise time, and time difference between the traveling wave and the measurement points at both ends of the line; establishing a first relationship based on the principle of double-ended traveling wave ranging, describing the relationship between the time difference and the fault distance and the equivalent propagation velocity; establishing a second and third relationship based on the line's frequency variation characteristics, describing the relationship between the first rise time, second rise time, and the fault distance, the equivalent propagation velocity, and the line characteristic constant; and solving the three relationships simultaneously to obtain the equivalent propagation velocity, the fault distance, and the line characteristic constant corresponding to the current fault. This invention, by simultaneously solving the double-ended time difference and the rise time at both ends, achieves the synchronous completion of fault ranging and online calibration of the line's frequency variation characteristics, improving ranging accuracy.