Fault classification and positioning method for cable type power distribution network

Through multi-frequency harmonic injection, signal decoupling and harmonic impedance methods, combined with fast Fourier transform, high-precision and fast distribution network fault location are achieved, solving the problem of low efficiency of relying on manual inspection in the existing technology, and is suitable for reliable operation of intelligent distribution networks.

CN120507609AActive Publication Date: 2025-08-19SHANDONG UNIV OF SCI & TECH
6 Cites 1 Cited by

Patent Information

Application Number
CN202511005447.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-22
Publication Date
2025-08-19
Estimated Expiration
2045-07-22

AI Technical Summary

Technical Problem

The existing distribution network fault positioning technology relies on manual inspection, which has low efficiency and poor accuracy, and cannot achieve accurate distance measurement of underground cables and cannot meet the development needs of smart distribution networks.

Method used

The combination technology of multi-frequency harmonic injection and power electronic switch is adopted, combined with the phase mode transformation and harmonic impedance method of the extended Karenbauer matrix, fault type identification and positioning is achieved through fast Fourier transformation, eliminating electromagnetic coupling interference between the guide core and the shielding layer, reducing distance measurement errors, and supporting localized fault positioning.

Benefits of technology

It realizes high-precision and fast fault positioning of distribution networks, reduces dependence on remote monitoring systems, improves the reliability and efficiency of fault positioning, is suitable for complex noise environments, and reduces communication pressure.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

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.
Need to check novelty before this filing date? Find Prior Art