258 results about "Cable fault location" patented technology

The invention provides a distribution line fault location optimization method based on single-ended traveling wave location, and relates to the technical field of traveling wave detection. The method comprises the following steps: carrying out segmented modeling on a line, calculating the traveling wave propagation speed and wave impedance of each segment, and correcting the traveling wave propagation speed and wave impedance; collecting a voltage / current traveling wave signal of a detection point, and extracting a line mode component; performing wavelet transformation on the line mode component, detecting the wave head position of the initial traveling wave through a modulus maximum search algorithm, and recording the arrival time of the initial traveling wave, a corresponding first energy value and polarity; calculating a reflected wave time window based on segmented modeling parameters, screening reversed polarity waves with qualified energy attenuation, and calculating a fault distance; if no effective reflected wave is detected in the reflected wave time window, triggering a pseudo double-end mode; a result is verified through quadruple constraints; the problems of poor parameter adaptability, low signal processing precision, strong reflected wave dependence and incomplete verification in traveling wave distance measurement of a complex distribution line are solved, and the accuracy and reliability of fault distance measurement are improved.

The invention provides a power line fault distance measurement system and method, and belongs to the technical field of power line detection. The system comprises monitoring terminals deployed at two ends of a line and a background processing system, and each monitoring terminal comprises a sensor module used for detecting a traveling wave current signal related to a power line fault in the line; the data acquisition module is used for extracting the arrival time of a traveling wave head according to the detected traveling wave current signal; the GPS time synchronization module is used for adjusting the local clock of the data acquisition module, reducing the time synchronization error of the two monitoring terminals and correcting the arrival time of the traveling wave head; and the background processing system is used for calculating a traveling wave time difference and a junction wave velocity normalization processing result according to the corrected arrival time at the two ends of the line, and determining a fault position coordinate and a fault type. According to the invention, collaborative optimization of fault positioning precision and type identification in a hybrid power line environment is realized.

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 discloses a power distribution network three-core cable fault distance measurement analysis method and system, and relates to the technical field of fault distance measurement, and the key points of the technical scheme are that the method comprises the steps: carrying out the empirical mode decomposition of three-phase voltage and current signals; generating a dynamic correction wave velocity based on the cable type, the environment temperature and the soil humidity parameter; determining the first arrival time of the wave head of the initial traveling wave according to the instantaneous frequency abrupt change point of the alpha-mode component, screening the second arrival time of the first reflected wave by using the amplitude gradient of the zero-mode component, and calculating the arrival time difference; and calculating an initial fault distance, and calling the impedance matrix to iteratively correct the initial fault distance. According to the method, the dynamic wave velocity is coupled with multiple factors, the limitation of single parameter correction is broken through, and the problem of transient drift of the wave velocity is solved; and the STFT high-frequency resolution and the wavelet low-frequency stability are fused, and the ridge continuity is optimized in combination with dynamic programming, so that the traveling wave head detection precision can be improved.

An improved HHT algorithm-based cable fault location method and system for a distribution network. The method comprises: as both the voltage and the current of a traveling wave generated by a fault point and reaching a measurement end will sharply change and thus the wave front of the traveling wave will exhibit in a time-frequency graph a high-frequency leap, a leap point being the arrival time of the wave front, separately performing EEMD on line mode components of the double-end traveling wave to extract respective IMF components to be subjected to Hilbert transform, thereby obtaining the instantaneous frequency thereof, the first frequency leap point in the time-frequency graph thereof corresponding to the arrival time of the wave front of a respective fault traveling wave, and then performing fault location by means of a double-end fault location algorithm. The method and system overcome the shortcoming that single moduli of traditional transform matrices fail to reflect all fault types, and solve the problem that traditional EMD algorithms are prone to mode mixing and thus lead to bad accuracy of calibrating wave front signals of travelling waves and not high fault location precision.

The invention discloses a cable fault ranging signal joint noise reduction method and system based on improved TVFEMD-CEMDF, and the method comprises the steps: injecting a low-voltage pulse at a detection point, and obtaining an original low-voltage pulse reflection wave signal x (t); secondly, performing time-varying filtering empirical mode decomposition (TVFEMD) on the original low-voltage pulse reflected wave signal x (t) to obtain N intrinsic mode components; the N IMFs are separated, and a noisy mode component p (t) and a non-noisy mode component q (t) are obtained; carrying out noise reduction processing on the noisy mode component p (t) by using combined form difference filtering CEMDF to obtain a de-noised mode component s (t); and finally, combining and reconstructing the de-noised modal component s (t) and the non-noised modal component q (t) to obtain a de-noised signal f (t). According to the technical scheme, a solution is provided for the problems of low signal-to-noise ratio and strong interference of detection signals in cable fault pre-positioning.

The invention provides a leaky coaxial cable fault positioning method and system based on differential received signal strength, and the method comprises the steps: analyzing common faults of a leaky coaxial cable and the influence of the common faults on the received signal strength in combination with the distribution of wireless base stations and the transmission characteristics of the leaky coaxial cable; the method comprises the following steps: detecting the received signal strength of a leaky coaxial cable in real time by using a mobile terminal, carrying out equidistant sampling according to train position information, or sampling at equal time intervals when no position information exists, and uploading the current received signal strength information to an operation and maintenance center; the operation and maintenance center carries out differential processing on the collected signal intensity data, and the signal level attenuation rate is kept constant under the fault-free condition; and when the fault occurs, the signal level attenuation rate is obviously changed at the fault point, so that accurate fault positioning is realized. According to the invention, the construction and maintenance cost of leaky coaxial cable fault detection equipment can be obviously reduced, and the precision and efficiency of leaky coaxial cable fault positioning are greatly improved.

The invention relates to the field of cable fault detection, in particular to a distribution cable fault positioning method based on electric signal analysis, which comprises the following steps of: determining a cable analysis state of each abnormal response point according to an interval monitoring execution index; determining whether to perform initial interference analysis or execute evaluation analysis according to the cable analysis state of the abnormal response point location; when initial interference analysis is carried out, whether interference compensation processing and range optimization processing are carried out on each abnormal response point location or not is determined according to the reference feature matching index; determining whether to perform channel filtering or not according to the interference effect evaluation index, and determining whether to perform compensation acquisition processing on each cable monitoring interval or not according to the interference compensation coefficient; and when the execution evaluation analysis is carried out, determining whether to carry out redundancy distribution prompt for each abnormal response point location according to the execution redundancy parameters. According to the method, the cable fault positioning efficiency is guaranteed, and meanwhile, the requirement for monitoring point arrangement is lowered.

The invention discloses a 10kV armored cable fault distance measurement method based on an additional parallel inductor, and relates to the technical field of power equipment monitoring, and the method comprises the specific steps: S100, additional inductor configuration planning: analyzing the resistance, capacitance and inductance distribution of a power distribution network line and the parameters of an expected fault current. The method effectively solves the problems that the electrical quantity is difficult to detect and the distance measurement precision is influenced by asynchronous data in the fault distance measurement of the power distribution network, and after the power distribution network line breaks down, the line runs for a period of time with the fault by controlling the combination of a protection action and an algorithm and inputting an additional inductor, so that the steady-state electrical quantity is obtained for distance measurement calculation. The method not only increases the measurement time and the amplitude of the negative sequence component, but also provides steady-state positive sequence and negative sequence electrical quantities for distance measurement, so that fault information can be extracted more accurately after a fault occurs.

The invention discloses a current collection line single-phase earth fault distance measurement method, device and product, and the method comprises the steps: firstly obtaining a traveling wave signal of a target power transmission line, and extracting a traveling wave head signal in the traveling wave signal; then, multi-scale wavelet transformation is carried out on the traveling wave head signal, so that wavelet decomposition coefficients under different scales are obtained; then, the ratio of modulus maxima of the wavelet decomposition coefficients under the two specific frequency scales is calculated; therefore, based on the ratio, the frequency component amplitude ratio of the traveling wave head signal under the two specific frequencies can be determined; and finally, calculating the distance between the single-phase earth fault point and the traveling wave signal acquisition point according to the electrical parameters of the line and the amplitude ratio of the frequency component. Based on the fault distance, the specific position of the single-phase earth fault point on the line can be determined; therefore, compared with the prior art, the detection effect and the detection efficiency are improved, and the detection cost is reduced.

The invention discloses a fault location method based on primary and secondary fusion complete pole-mounted circuit breakers, and relates to the field of power distribution network fault judgment, and the method comprises the following steps: selecting one pole-mounted circuit breaker between pole-mounted circuit breakers of a power transmission line as a master device, and taking the other pole-mounted circuit breakers as slave devices; the main equipment is configured to be a pole-mounted circuit breaker with the best 4G / 5G signal or a pole-mounted circuit breaker closest to the main station; optical fibers are connected among the pole-mounted circuit breakers and ad hoc networks are formed; the pole-mounted circuit breakers are subjected to time synchronization through optical fibers. When the device is applied, devices on the whole line are cascaded through optical fiber communication, ultrahigh time precision is provided, the fault distance measurement accuracy is improved, the network safety problem is completely eradicated in an ad hoc network mode, the device is not affected by networks and regions, and active fault detection and fault distance measurement are achieved by actively sending pulse signals.

The invention provides an optical cable fault positioning method based on OTDR signal characteristic adaptive denoising and event identification, and the method comprises the steps: classifying modal components after OTDR signal adaptive noise decomposition based on a preset entropy threshold value, and obtaining a noise dominant component, a mixed component and a signal dominant component; singular value difference spectrum abrupt change point detection is carried out on the noise dominant component, and residual useful signals are extracted; verifying the entropy value of the mixed component, and reconstructing the component meeting the entropy threshold value, the signal dominant component and the residual useful signal into a de-noised signal; synchronously optimizing hyper-parameters and feature selection subsets of the support vector machine by adopting a swarm intelligence algorithm, wherein search parameters of the algorithm are dynamically updated according to an exponential decay mechanism; and outputting fault point space position information based on the optimized support vector machine model.

The invention discloses an intelligent fuse with a fault location function, and relates to the technical field of fuses. The device comprises an insulating assembly, an insulating column, two first rainproof covers which are located at the upper part of the insulating column and are arranged in a right-angle manner, two second rainproof covers which are located at the lower part of the insulating column and are arranged in a right-angle manner, and a linkage switching assembly, comprising a linkage cylinder parallel to the insulation column, an electromagnet fixed to the bottom in the linkage cylinder, a metal column located over the electromagnet, a fusing assembly comprising two fusing tubes symmetrically located on the left and right sides of the linkage cylinder, and a gas pushing assembly. Comprising a pushing cylinder located on one side of the linkage cylinder and a pushing rod located in the pushing cylinder. According to the invention, the movement of the metal rod is controlled through the electromagnet, so that the switching work of the other fuse tube can be ensured when the fuse tube is naturally damaged, the normal work of the fuse is ensured, and meanwhile, the reason of the open circuit of the fuse can be quickly judged through the use of the push rod.

The invention discloses a cable operation state fault rapid detection method based on an improved grey wolf algorithm model. The method comprises the following steps: collecting fault data through a detection unit; cleaning, denoising, normalization processing and feature extraction are carried out on the collected fault data; constructing an improved grey wolf algorithm model, wherein the improved grey wolf algorithm model comprises a coding module, an adaptive weight adjustment module, a multi-objective optimization module, a population diversity control module and an optimal path search module; fault detection is carried out on the cable operation state data through a global search module and a local search module; real-time monitoring and early warning are carried out, wherein the real-time monitoring and early warning comprise early warning threshold setting, early warning signal triggering, early warning notification and feedback optimization; according to the invention, the operation state fault of the cable is detected through the improved grey wolf algorithm model, and the detection efficiency and the accuracy of cable fault positioning are greatly 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.

The invention provides a fault signal detection system and an analysis positioning method, and relates to the technical field of signal detection. An injection module is used for periodically applying narrowband acoustic disturbance capable of adaptively selecting frequency and power to an optical cable sheath; the passive wireless label nodes arranged along the line collect multi-dimensional data such as arrival timestamps, amplitudes, frequencies, phases, local temperatures and the like in real time, and upload the data through near-field coupling. And the convergence module completes node identification association and batch aggregation, the analysis and construction module constructs an acoustic propagation path map, and after temperature difference segmentation compensation, an actual laying path is dynamically recovered by adopting a map search algorithm. And the projection and identification module maps the map to a geographic information system coordinate system and outputs a fault space position, thereby realizing real-time and accurate optical cable fault positioning under a topology-free prior condition, remarkably reducing manual inspection and misjudgment rates, and being suitable for a multi-branch and multi-repair long-distance communication or power optical cable scene.

The invention discloses an ICEEMDAN and improved YOLOv8-based power transmission line fault location method, which comprises the following steps of: respectively constructing a fault identification model and a fault location model by using an improved YOLOv8 network, carrying out phase-mode transformation on a three-phase voltage transient signal of a fault line by using a Karen transform method, selecting a line-mode component as a fault traveling wave research object, decomposing the line-mode component by using an ICEEMDAN algorithm, and carrying out fault location on the three-phase voltage transient signal of the fault line. Using an NTEO algorithm to strengthen a modal component of the line mode component, highlighting fault signal features, and obtaining a fault traveling wave energy spectrogram and an amplified traveling wave energy spectrogram; an initial fault time range is determined by using a fault identification model, and then a fault time point, namely the accurate arrival time of fault traveling wave heads at two ends of the line, is obtained by using a fault positioning model according to the amplified traveling wave energy spectrogram. The method improves the precision of line fault distance measurement, is not affected by transition resistance, fault distance and transmission lines, and is high in reliability and good in practicability.

The invention is suitable for the technical field of fault distance measurement, and provides a power distribution network fault distance measurement method and system based on fault point voltage transient waveform comparison, and the method comprises the steps: collecting three-phase voltage and current signals at two ends of a line when a power distribution network fault occurs, and extracting a transient component signal in a preset frequency range; performing phase-mode transformation decoupling processing on the transient component signal; constructing a transient voltage differential equation from the two ends of the line to a hypothetical fault point, dynamically adjusting the fault position hypothetical point in a preset distance measurement interval by adopting a dichotomy, and calculating a transient voltage calculation waveform from the two ends of the line to the fault position hypothetical point; performing time domain similarity analysis on the transient voltage calculation waveform, and calculating a waveform consistency index; judging whether a preset convergence condition is met or not; if yes, determining that the current fault position hypothesis point is a target fault point; otherwise, adjusting the dichotomy interval according to the waveform comparison difference direction, and carrying out the next round of iterative calculation until the convergence condition is met, thereby effectively improving the fault distance measurement accuracy.

The invention, which belongs to the technical field of fault detection, discloses a fault distance measurement and fault positioning system for a distributed power line, comprising a line signal state analysis module, a line signal adjustment module, a line communication interference determination module and a line fault distance measurement and positioning result output module. According to the method, the accuracy of the input signal is judged by analyzing the characteristics of the abnormal signal, so that the signal is adjusted, the accuracy of the input signal of the ranging and positioning system is improved, the problem that the accuracy of the input signal is neglected in the prior art is effectively solved, the system can accurately and quickly carry out ranging and positioning on a fault, and the working efficiency is improved. Losses caused by wrong positioning faults are reduced, and power supply reliability and stability are improved.

The invention discloses a distribution network single-phase earth fault distance measurement method and system based on zero and negative sequence components, and belongs to the technical field of power systems, the distribution network single-phase earth fault distance measurement method based on zero and negative sequence components comprises the following steps: carrying out line section division on a distribution network line, and obtaining line parameter information; when the system operates normally, the detection device monitors three-phase voltage and current and carries out data processing; judging whether a single-phase earth fault occurs or not according to the data change; based on a fault judgment result, a fault section is obtained from the distribution automation system, and equivalent zero-sequence and negative-sequence networks of the system are established; measuring three-phase voltage and current time domain signals after the fault by using a detection device at the bus, and carrying out data processing again; and establishing a distance measurement function of the fault section, solving the function, and calculating the distance from the fault point to the head end of the fault section. According to the method, high precision is kept under various distribution network structures such as a mixed line and a multi-branch line, and the distance measurement precision is not affected by grounding resistance.

The invention relates to the technical field of power distribution network fault distance measurement, in particular to an active power distribution network fault distance measurement method and system based on double-end voltage waveform comparison. The method comprises the following steps: acquiring voltage and current data of a first target point and a second target point of a distribution line; setting an initial fault point on the distribution line by using a dichotomy method, and calculating a first voltage waveform and a second voltage waveform at the initial fault point based on the voltage and current data of the first target point and the second target point; comparing the first voltage waveform with the second voltage waveform by adopting a directed distance algorithm to obtain a waveform difference degree; determining whether the initial fault point is a target fault point position or not according to whether the waveform difference degree meets a preset threshold condition or not; and when the waveform difference degree does not meet a preset threshold condition, based on a comparison result of the first voltage waveform and the second voltage waveform, resetting the position of the fault point by using a bisection method. According to the method, the fault location problem of the power distribution network containing the distributed power supply is solved by combining double-end voltage waveform comparison with dichotomy approximation.

The invention discloses a traveling wave triggering constant value adjusting method and device, a storage medium and computer equipment, relates to the technical field of traveling wave fault distance measurement, and mainly aims to solve the problem that key fault feature information of a power transmission line is lost due to a fixed triggering constant value of a non-contact traveling wave positioning device on a distributed monitoring node in the prior art. Comprising the steps of obtaining a power transmission line topological graph and a constant value list, and determining a double-end substation constant value line table corresponding to a to-be-adjusted power transmission line based on the constant value list and installation point position information in the power transmission line topological graph; when an initial instantaneous fault occurs, acquiring a traveling wave amplitude reported by each non-contact traveling wave positioning device on the to-be-adjusted power transmission line; determining a fault point interval position on the to-be-adjusted power transmission line based on the traveling wave amplitude and a double-end transformer substation constant value line table; and determining a triggering constant value of the to-be-adjusted non-contact traveling wave positioning device on the to-be-adjusted power transmission line according to the fault point interval position and the double-end transformer substation constant value line table.

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.

The invention relates to the field of electrical system fault detection, and provides a cable fault positioning method and system based on neural network learning. The method comprises the following steps: acquiring a cable traveling wave signal and preprocessing the cable traveling wave signal to obtain a preprocessed traveling wave signal; performing high-speed parallel acquisition on the preprocessed traveling wave signal to obtain multi-channel digital traveling wave data; performing multi-resolution decomposition on the multi-channel digital traveling wave data through a fast wavelet transform algorithm, and performing feature extraction on a wavelet coefficient obtained through decomposition to obtain a fault feature vector; and carrying out classification identification on the fault feature vector through a multilayer perceptron neural network, and carrying out fault position calculation on a classification result to obtain a fault positioning result. According to the invention, the cable fault positioning precision and reliability are improved.

The application discloses a submarine cable path detection device and method and a cable fault positioning method, and the detection device comprises a detection ship, a general control module, a rudder control module, a positioning and information transmission system, a cable path detection assembly, a fault detection assembly and a land centralized control center. The application applies low-frequency voltage to the fault of the submarine cable, so that an alternating magnetic field is generated in the sea area around the cable, and the trend of the submarine cable is detected and judged, the technical defects that the submarine cable is inconvenient to maintain when the actual line deviates from the original laid line are overcome, time is saved, and efficiency is improved. The cable fault positioning method of the application quickly positions the fault point, overcomes the problems that the previous determination of the submarine cable fault point is time-consuming and labor-consuming, and the positioning accuracy of the fault point is not high, and improves the positioning accuracy and efficiency of the fault point.

The invention discloses a power cable outer sheath fault positioning method, and belongs to the technical field of cable fault positioning. Aiming at the problems of poor adaptability, weak anti-interference capability and low positioning precision of the existing cable outer sheath fault positioning technology, the method comprises the following steps of: acquiring horizontal and vertical components of an electromagnetic signal by deploying an array sensor, and obtaining pure vector distribution through Fourier transform and wavelet denoising processing; judging coordinates of an abnormal point according to an amplitude threshold value and a phase ratio, and determining a fault cluster center by adopting K-means clustering; and fusing the environmental data, refining the position through iterative filtering, comparing and confirming a final fault point in combination with triangulation and historical data, and generating a vector distribution map and a diagnosis report. According to the invention, high-precision and anti-interference positioning and visual diagnosis of cable faults in a complex environment are realized.

The invention belongs to the technical field of power distribution network fault positioning, and provides a cable type power distribution network fault classification and positioning method, which comprises the steps of identifying a three-core cable structure and electrical parameters, constructing a normal and fault state model, generating a fault identification signal by using a power electronic switch combination of an additional power supply, and detecting a fault type. And obtaining short-circuit current data through phase-mode conversion, and calculating a fault distance by adopting a harmonic impedance method. According to the invention, the multi-frequency harmonic injection and power electronic switch combination technology is utilized to enhance the weak fault current detection capability; a phase-mode transformation method for expanding a Karenbauer matrix is adopted, and electromagnetic coupling interference between the guide core and the shielding layer is eliminated; a harmonic impedance fault distance measurement method reduces the distance measurement error; localized fault positioning is achieved through fast Fourier transform, and dependence on a remote monitoring system is reduced. According to the invention, high-precision, strong-disturbance-rejection and fast-response power distribution network fault positioning is realized, and an efficient technical scheme is provided for reliable operation of the intelligent power distribution network.

The invention relates to a power distribution network cable fault positioning method based on limited DTU measuring point measurement data, and the method comprises the steps: 1, enabling the positive-sequence injection current of a fault point to be equivalent to the virtual injection current of nodes at two ends of a fault region, and constructing a fault region judgment model; and 2, solving an underdetermined node voltage equation by using a compressed sensing theory to obtain virtual injection current and realize positioning of a fault area. According to the method, the fault area can be effectively positioned only through a small number of measuring points, the influence of fault types, transition resistance and load change factors is small, and the method has certain anti-noise capacity.

The invention discloses a new energy transmission line inter-phase fault distance measurement method and system, and the method comprises the steps: starting an element to act after a fault occurs, and inputting low-voltage ride-through control and complex-frequency signal injection control; fault phase selection is realized according to a voltage phase selection element, and fault phase voltages and currents under two characteristic frequencies are extracted through filtering; if the fault is a two-phase short-circuit fault, extracting and replacing the fault phase-to-phase voltage, and replacing the transition resistor with Rf / 2; if the fault is a three-phase short-circuit fault, the phasors of the phase voltage and current difference of any two phases are brought in; according to the equivalent circuit under the characteristic frequency, a frequency domain parameter equation about the fault distance is obtained; respectively splitting a real part and an imaginary part of the frequency domain parameter equation of the fault distance to obtain a real coefficient equation set about the fault distance; when the non-power-frequency electrical quantity is extracted, the real coefficient equation set is expanded into an overdetermined equation with the equation number of 4N, and the solution of the overdetermined equation in the least square meaning is solved; and obtaining a distance measurement result of the new energy transmission line.

The invention discloses a cable fault positioning method, device and equipment and a storage medium, and relates to the technical field of fault positioning. The method comprises the following steps: acquiring impedance data of a to-be-detected cable; chirp-Z transformation is carried out on the impedance data to obtain positioning spectrum data, the positioning spectrum data comprises a corresponding relation between a normalized amplitude and a target distance, and the target distance is the distance from an acquisition point of the impedance data; and determining the fault position of the to-be-detected cable according to the positioning spectrum data. According to the technical scheme provided by the embodiment of the invention, the impedance data is processed by utilizing Chirp-Z transformation, the accurate positioning spectrum data with higher resolution, fewer interference peaks and low data redundancy are obtained, and the positioning of various cable faults can be realized according to the corresponding relationship in the positioning spectrum data.