高压电缆外护层破损演进与护层环流相关性研究

A Study on the Correlation between Damage Evolution of Outer Protective Layer and Sheath Circulation of High Voltage Cables

中文关键词:高压电缆  护层环流  外护层破损  故障演进  电缆工况

keywords:high-voltage cable  sheath circulation  outer protective layer damage  damage evolution  cable working conditions

中文摘要:高压电缆外护层是电缆接地系统的重要组成部分，外护层破损渐进演变严重后会导致线路故障。为实现对电缆外护层破损演进的精确监测，基于护层环流理论，构建了交叉互联电缆外护层破损仿真模型，研究了不同工况下外护层破损演进与护层环流的相关性。仿真结果表明，监测电缆各护层回路对应的首末端护层环流幅值比可有效反映外护层破损程度与破损位置，从而实现对外护层破损故障更加及时的发现和预防。

Abstract:The outer protective layer of high voltage cables is a crucial component of the cable grounding system. Damage to this layer can result in line faults. To accurately monitor the degradation of cable outer protective layers， a simulation model for cross-connected cable sheath damages has been constructed based on the theory of sheath circulation. The correlation between the evolution of outer protective layer damage and sheath circulation under various working conditions has been studied. It has been found that the amplitude ratio of sheath circulation at the head and end of each sheath loop of the cable can effectively reflect the extent and location of the outer protective layer damage. This enables the timely detection and prevention of outer protective layer damage.