Research on the Matching of Unequal Diameter Cables to Improve the Carrying Capacity of High-voltage Submarine Cable Landing Section

Abstract

The conventional method of increasing the current carrying capacity of the submarine cable landing section increases the manufacturing cost of the submarine cable and the long-term operational reliability. This paper introduces the unequal diameter cable joint technology, the actual current-carrying capacity of the 220kV submarine cable landing section and the submarine section was checked. A differentiated unequal diameter submarine cable landing section and submarine section conductor cross-section matching principle was put forward. The economic efficiency of the unequal diameter cable matching scheme was evaluated. The research results show that, the larger the conductor cross-section of the submarine cable, the greater the drop in current-carrying capacity during the landing section. In the unequal diameter matching method, the single-core or copper wire armored submarine section cable requires a smaller conductor cross-section. The maximum transmission capacity can be obtained when the submarine cable line is all single-core copper wire armored. When it is all single-core steel wire armor, it can take into account the larger transmission capacity of the submarine cable line and the optimal unit capacity cost. This article provides a reference for the design and selection of submarine cable lines.