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.
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