Research on Circulation Current of Sheath and Armor of Single-core Submarine Cable Based on Impedance Matrix Analysis

Abstract

The circulation current of sheath and armor of single-core submarine cable are important factors affecting its safe operation. In this paper, the impedance matrix model of single-core submarine cable is established for the insulation damage fault caused by heating at the grounding position of a 220kV submarine cable in a wind farm. Using the electromagnetic transient analysis software ATP-EMTP, the effects of resistivity and permeability on impedance matrix and circulating current were analyzed. Through the analysis, the cause of damage accident was found and suggestions were made for the operation and maintenance of the submarine cable.