Method for establishing a sub-periodic disturbance analysis model for early-stage faults in medium-voltage power cables

By conducting pressure tests and signal analysis on early-stage faults of medium-voltage cables, a disturbance analysis model for early-stage cable faults was established, which solved the problem of inaccurate parameter setting in the existing technology and achieved accurate detection and identification of early-stage faults of medium-voltage cables.

CN116298668BActive Publication Date: 2025-10-03CHONGQING UNIV
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Patent Information

Application Number
CN202211720920.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-30
Publication Date
2025-10-03
Estimated Expiration
2042-12-30

AI Technical Summary

Technical Problem

The existing technology lacks research on the sub-cycle arc characteristics of early-stage faults in medium-voltage cables, resulting in inaccurate parameter settings and difficulty in accurately detecting and identifying early-stage faults in cables.

Method used

By conducting a pressure test on the medium-voltage cable, the sub-periodic voltage disturbance signal of the cable early fault is collected and divided into three stages. A voltage sub-periodic disturbance analysis model is established, including determining the disturbance frequency, extracting a single disturbance signal, performing fitting parameter processing, and finally constructing an attenuated vibration model.

Benefits of technology

It achieves accurate analysis of early faults in medium-voltage cables and provides precise data support for subsequent fault maintenance.

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Abstract

The present invention provides a method for establishing a sub-periodic disturbance analysis model for early-stage faults of a medium-voltage power cable, comprising the following steps: S1. performing a pressurization test on a medium-voltage cable with local defects, and collecting a sub-periodic disturbance signal of a voltage of an early-stage fault of the cable during the pressurization process; S2. dividing the sub-periodic disturbance signal of the voltage into three stages, including stage 1, stage 2, and stage 3, wherein stage 1 is a normal stage, stage 2 is a disturbance stage, and stage 3 is a disturbance transient recovery stage; S3. processing the sub-periodic disturbance signal of the voltage in stage 2 to obtain a sub-periodic disturbance analysis model; S4. establishing a sub-periodic disturbance attenuation vibration model of the voltage based on the three-stage disturbance transient recovery signal; the method can accurately analyze the sub-periodic disturbance of the medium-voltage cable and provide accurate data support for subsequent fault maintenance.
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