500kV海底电缆铠装损坏水下原位修复研究

Research on Underwater Repair of 500 kV Submarine Cables Armor Damage

本工作基于500 kV海底电缆铠装及周围护层存在损坏的情况,设计了水下原位修复方案代替传统打捞修复方案,保护未受损绝缘;设计了从半导电护套到铠装层的各护层修复方法,并使用钛合金夹具及弯曲限制器对修复部位进行保护;随后通过力学计算及试验,校核了机械连接和弯曲限制器的可靠性,结果符合要求;最后校核弯曲限制器部位的载流量,弯曲限制器部位海底电缆埋深应小于1500 mm。

Based on the fact that 500 kV submarine cables armor and surrounding protective layer were damaged,the underwater in-situ repair scheme was designed according to the actual situation to replace the traditional salvage repair scheme,which could protect the undamaged insulation.The repairing methods from semi-conductive sheath to armored layer were designed,and titanium alloy clamp and bending limiter were used to protect the repairing parts.Then through mechanical calculation and test,the reliability of mechanical connection and bending limiter was checked,and the results met the requirements;Finally,the ampacity of the bending limiter was checked,and the buried depth of the submarine cables at the bending limiter should be less than 1500 mm.