Cable accessory fault location method and system

By injecting a continuous linear frequency modulated signal into the cable accessory, the reflected signal is decomposed and corrected to identify bubble migration, thus solving the problem of gas interference at the insulation interface, achieving accurate location of cable accessory faults, and ensuring the stability of the power system.

CN120722114BActive Publication Date: 2026-03-31HUNAN GONGLIAN ELECTRIC CO LTD
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Patent Information

Application Number
CN202510939485.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-08
Publication Date
2026-03-31
Estimated Expiration
2045-07-08

AI Technical Summary

Technical Problem

In existing technologies, cable accessory fault location methods suffer from gas interference and reflected signals generated by the discharge when facing insulation interface breakdown faults, leading to deviations or errors in the location results and making it difficult to accurately identify the fault location.

Method used

A continuous linear frequency modulated signal is injected through a circulator, the reflected signal is collected and decomposed, the nonlinear component is extracted, the bubble migration is identified based on the electric field distortion coefficient, the signal is corrected through the air gap, and the process is repeated until the faulty accessory is located.

Benefits of technology

It effectively eliminates interference from discharge gas at the insulation interface, improves the accuracy and reliability of fault location in cable accessories, and ensures the safe and stable operation of the power system.

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Abstract

The application provides a cable accessory fault positioning method and system. The method comprises the following steps: collecting reflection signals of a linear frequency modulation signal reflected at multiple impedance discontinuous points in a cable accessory; arranging all the reflection signals into a reflection signal sequence; selecting a first reflection signal in the reflection signal sequence as a selected signal; identifying bubble migration caused by insulation interface discharge at a reflection position corresponding to the selected signal according to amplitude-frequency characteristics of a nonlinear component in the selected signal; correcting an air gap of a next reflection signal in the reflection signal sequence based on the bubble migration, taking the air gap corrected signal as a new selected signal, repeating the above steps until the last reflection signal in the reflection signal sequence is corrected; and tracing and positioning a fault accessory on the cable according to the linear frequency modulation signal and each air gap corrected reflection signal. The method can eliminate the interference of the gas generated by the discharge at the insulation interface on the reflection signal.
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