海底电缆用阻水型线导体设计方法及试验研究

Design Method and Experimental Study of Water-Blocking Special-Shaped Wire Conductor for Submarine Cable

阻水导体的设计制造是海底电缆领域内的关键课题之一。提出一种等截面梯形型线阻水导体结构的理论设计方法,通用性强,可编程性高,适用于50~3500 mm2阻水导体的设计和生产制造,可解决阻水型线导体设计和制造困难、尺寸不合理等问题,导体填充系数可达到0.96以上;然后,通过阻水、机械、电气性能试验,验证所述理论设计方法和工艺制造的合理性,导体结构对海缆的整体性能无不良影响,且阻水胶型线导体结构优于阻水带结构;最后,根据理论计算,所述方法设计的中压海缆型线导体外径比紧压圆形导体小3.9%~7.0%,最大可降低1.1%的制造成本。导体截面越大,型线导体结构优化越显著,验证了型线结构海缆的经济性。

The design and manufacture of water-blocking conductor is one of the key research topics in field of submarine cable.A new theoretical design method is proposed for trapezoidal wire water-blocking conductor with structures of constant cross section,which has strong versatility and high programmability,suitable for design and manufacturing of water-blocking conductor with a cross-section ranging from 50 mm2 to 3500 m2.The problems such as difficult design&manufacturing and unreasonable conductor size could be solved,with a filling coefficient of conductor reaching more than 0.96.Then,the rationality of the theoretical design method and manufacturing process is verified through water-blocking,mechanical and electrical performance tests.The trapezoidal wire conductor structure has no adverse effect on the cable’s overall performance,and the water-blocking glue conductor is better than that of the water-blocking tape structure.Finally,according to theoretical calculation,the outer diameter of the trapezoidal wire conductor for medium voltage submarine cables designed with the proposed method are 3.9%~7.0%smaller than that of compact circular conductor,which can reduce the manufacturing cost by 1.1%.With the larger conductor cross-section,the structure optimization is more significant,which verifies the economy of submarine cables with trapezoidal wire conductor structure.