基于湿式设计的低压海底电缆研制

Development of Low-Voltage Submarine Cable Based on Wet Design

湿式设计采用聚合物护层结构径向阻水层代替传统干式设计的金属套类护层结构径向阻水层,使海底电缆产品结构更简单、制造和敷设成本更低、性价比更高。首次尝试湿式设计了900 m短长度、3×35 mm^(2)小规格、0.9 mm薄绝缘220 V低压海底电缆。该基于湿式设计的低压海底电缆通过设置高密度聚乙烯(HDPE)绝缘挡水层和HDPE缆芯挡水层(内衬层)结构实现了径向阻水,电缆满足相关设计要求。该低压海底电缆的设计、制造、敷设和成功运行表明湿式设计可以运用于工作电压等级较低的海底电缆研制。

The wet design adopts a polymer sheath structure with radial water barrier to replace a metal sheath structure with radial water barrier in the traditional dry design,making the product structure of a submarine cable simpler,lower manufacturing and laying costs,and higher cost-effectiveness.For the first time,wet design has been carried out for 220 V low-voltage submarine cable with 900 m short length,3×35 mm^(2) small specification and 0.9 mm thin insulation.The low-voltage submarine cable based on wet design achieves radial water resistance by setting HDPE insulation water barrier and HDPE cable core water barrier(inner lining layer) structure,and the cable meets relevant design requirements.The design,manufacturing,laying,and successful operation of this low-voltage submarine cable indicate that wet design can be applied to the development of submarine cables with lower working voltage level.