Fault location method for buried cable of wind farm based on traveling wave positioning

By using high-pass filtering differential processing and synchronous phase-locked timing technology, combined with standard reflected waveform templates and cable physical topology, the problems of noise interference and wave velocity variation in fault location of buried cables in wind farms were solved, achieving high-precision and rapid fault location.

CN122362010APending Publication Date: 2026-07-10HANGZHOU SHIHOU ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU SHIHOU ENERGY TECH CO LTD
Filing Date
2026-05-26
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Traditional traveling wave fault location technology cannot effectively filter out environmental noise and cable noise interference in buried cables in wind farms. The traveling wave signal recognition accuracy is low, the fixed wave velocity parameter leads to large positioning deviation, it cannot adapt to changes in cable operating conditions, and the lack of standardized templates for fault point identification results in inaccurate positioning results and long time consumption.

Method used

The waveform edge features are enhanced by high-pass filtering and differential processing. The arrival time of the traveling wave is latched by synchronous phase-locked loop timing. The reflected segment of the fault point is extracted by sliding matching using a standard reflected waveform template. A dual propagation path is constructed to correct the traveling wave velocity variable. The fault point is accurately located by combining the physical topology of the cable.

Benefits of technology

Stable coupling and complete data acquisition of fault traveling wave signals were achieved, the arrival time of the traveling wave was accurately latched, and the fault point was quickly and accurately located, improving the positioning accuracy and efficiency, and ensuring the stability and reliability of the results.

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Abstract

The application relates to the technical field of fault positioning, and discloses a wind farm buried cable fault positioning method based on a traveling wave positioning method, which comprises the following steps: coupling a fault traveling wave signal, collecting and generating a head-end fault waveform data set, performing high-pass filtering and differential processing on the output edge enhanced waveform, comparing the output edge enhanced waveform with a reference voltage to generate a rising edge signal, and then locking the wind farm traveling wave arrival time; sliding matching a standard reflected waveform template with the head-end fault waveform data, intercepting a fault point reflection segment, and taking the first geometric length from the cable head end to the nearest branch point as a reference to construct a first propagation path and a second propagation path of the traveling wave propagation; eliminating the traveling wave speed variable by using the time length relationship between the first propagation path and the second propagation path, matching the obtained continuous length value to the physical topological structure of the wind farm, and outputting a cable section where the fault point is located as a final positioning result; and the application can improve the efficiency of the wind farm buried cable fault positioning.
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