摘要
Abstract
The circulating current of the metallic sheath of high-voltage cables serves as a core indicator for evaluating the operational health of cable grounding systems.However,it is subject to coupled interferences from multiple factors including cable layout,grounding type,multi-circuit electromagnetic coupling and on-site environmental noise.Conventional monitoring methods relying on a single fixed threshold face prominent engineering drawbacks,such as high fault misjudgment rate,poor capacity to identify weak signals of early insulation deterioration,and limited diagnostic dimensions.To address these problems,this paper proposes an intelligent monitoring method for sheath circulating current that integrates multi-source operation data and adopts rough set theory to reduce redundant parameters;establishes a refined equivalent circuit model for cross-bonding transposition sections covering five categories and ten influencing factors;construct a multi-dimensional anti-interference state characterization system,and designs a dual-architecture intelligent monitoring system integrating edge terminals and cloud analysis.Meanwhile,the effectiveness of the proposed method is verified through field circulating current tests on 12 in-service cable lines and electrothermal combined detection of 220 kV cable terminals.Field measurement results demonstrate that the proposed method can effectively eliminate non-fault interferences including load fluctuation,asymmetric laying and external electromagnetic disturbance,accurately capture weak characteristic signals of early sheath insulation deterioration,and significantly improve fault diagnosis accuracy and system anti-interference capability.It facilitates the transformation of cable circulating current monitoring from simple data collection to intelligent analysis,and shifts the maintenance mode from post-fault emergency repair to pre-fault risk early warning.This research provides a complete theoretical basis and engineering practice scheme for condition-based maintenance and full-cycle intelligent operation&maintenance of high-voltage cable grounding systems.关键词
高压电缆/金属护套环流/多源数据融合/粗糙集/特征挖掘/电热联合检测Key words
high-voltage cable/metallic sheath circulating current/multi-source data fusion/rough set/feature mining/electrothermal combined detection分类
信息技术与安全科学
