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针对大长度单芯海底电缆的铅包及铠装损耗引起的载流量下降甚至海缆故障的问题,提出了2种解决方法:将钢丝铠装换成铝合金丝铠装(相对磁导率较小)以及在铅包铠装回路串联电阻。在一定理论分析的基础上设计了岸滩环境下海底电缆热循环试验系统,针对110 k V单芯海底电缆展开一系列对比试验,包括互感测试、损耗测试、温升测试等。探索并验证了采用该2种方法降低海缆损耗、保护海缆及提高载流量的工作原理及改善效果。结果表明,铅包环流对铠装层具有屏蔽作用,因此改变铠装材质和串接电阻可使得被试海缆载流量分别提高了24.2%和9.68%。
Aiming at the problem of drop of the current carrying capacity caused by lead package and armor loss of large-length single-core submarine cable and even the failure of submarine cable, two solutions are proposed: replacing the steel wire armor with aluminum alloy wire armor (relative permeability Small) and in the lead package armored circuit series resistance. On the basis of theoretical analysis, a submarine cable thermal cycle test system was designed and developed for a 110 kV single core submarine cable, including a mutual inductance test, a loss test and a temperature rise test. Explore and verify the use of the two methods to reduce the loss of the submarine cable to protect the submarine cable and improve the working principle and improve the carrying capacity. The results show that the lead encircling current has a shielding effect on the armor layer. Therefore, changing the armor material and the series resistance can increase the current carrying capacity of the test submarine cable by 24.2% and 9.68% respectively.