Research on improvement of current carrying capacity of submarine cable based on unequal diameter matching of land and sea sections

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 and checks and analyzes the actual current-carrying capacity of the 220 kV submarine cable landing section and the submarine section. Also， it proposes a differentiated unequal diameter submarine cable landing section and submarine section conductor cross-section matching principle and evaluates the economic efficiency of the unequal diameter cable matching scheme. 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 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 account of the larger transmission capacity of the submarine cable line and the optimal unit capacity cost.

Keywords

• submarine cable
• unequal diameter
• current carrying capacity
• cross-section matching
• economic efficiency