Typical Cases Analysis of Transmission Cable Sheath Grounding System Defects
摘要
For theoretical analysis, this paper proposes the calculation method of induced current and capacitive current components of the sheath circulating current. It refines the precise positioning method of sheath grounding fault based on the measurement and analysis of cable current, the online diagnosis method of sheath grounding system faults based on the analysis of circulating current continuity, and the recognition method of defects such as open-circuit of sheath based on the calculation of capacitive current. For practice, three actual cases in engineering applications strongly prove the accuracy of the diagnosis methods proposed in this paper, which provides a new direction for the operation analysis of transmission cables and also guides the condition maintenance of the cable lines.