Non-contact detection method and system for aging state of lightning arrester

By constructing a spatial magnetic field gradient tensor matrix and performing thermo-electrodynamic phase space trajectory analysis, the problems of weak current extraction and false alarms in non-contact detection of surge arresters were solved, enabling accurate aging status assessment and lifespan prediction of surge arresters, and improving the anti-interference capability and diagnostic confidence of the detection.

CN122171915APending Publication Date: 2026-06-09JIANGXI YIYUAN INSULATOR CO LTD
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Patent Information

Application Number
CN202610492033.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-15
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing non-contact detection technologies for surge arresters are difficult to effectively extract weak leakage currents in complex electromagnetic environments, are easily affected by external environmental factors and generate false alarms, and lack quantitative assessment of the internal nonlinear degradation state of the equipment and prediction of its remaining life.

Method used

By acquiring the multi-node spatial magnetic induction intensity vector and two-dimensional temperature distribution matrix of multiple spatial nodes around the surge arrester, and combining temperature drift compensation and node differential calculation, a spatial magnetic field gradient tensor matrix is ​​constructed to remove far-field interference, reconstruct the near-field resistive current signal, and extract topological geometric distortion parameters through spatial cross-phase-locked verification and thermo-electrodynamic phase spatial trajectory analysis, thereby realizing the prediction of the remaining effective life of the equipment.

Benefits of technology

Accurate extraction of weak leakage current inside surge arresters in complex electromagnetic environments reduces false alarm rates, enables keen detection of nonlinear degradation characteristics of equipment and quantitative prediction of remaining life, and promotes predictive health management of surge arresters.

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Abstract

The invention relates to the field of fault prediction and health management, and discloses a non-contact detection method and system for the aging state of a lightning arrester, and the method comprises the following steps: obtaining a multi-node magnetic field and a thermal radiation baseline of the lightning arrester, and completing the temperature drift compensation; a space magnetic field gradient tensor matrix is constructed in combination with node weights, and far-field uniform interference decoupling near-field resistive current is stripped through phase-sensitive detection; magnetic field and surface thermal gradient distortion pointing vectors are extracted, and cosine similarity is calculated to execute space cross phase locking verification so as to eliminate false anomalies; constructing a thermal-electric dynamic phase space by using the resistive current and the temperature change rate, and extracting topological geometric distortion parameters of a limit hysteresis loop; and the parameters are used for feeding back and adjusting the difference calculation weight and are mapped to a Weibull degradation equation to reversely solve the remaining effective life. According to the invention, high-purity signal reconstruction and homology false alarm prevention are realized in a complex environment, and a closed-loop system with adaptive detection and accurate life prediction is constructed.
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