拖曳电缆屏蔽层半绝缘导线打火故障诊断与机理研究  

Diagnosis and Mechanism Study on Ignition Fault of Semi Insulated Conductor of Trailing Cable Shield

作　　者：赵林建 郭磊磊 洪有财[1] Zhao Linjian;Guo Leilei;Hong Youcai(Hangzhou Institute of Applied Acoustics,Hangzhou 310023,China)

机构地区：[1]杭州应用声学研究所,杭州310023

出　　处：《机电工程技术》2022年第7期111-114,共4页Mechanical & Electrical Engineering Technology

基　　金：国防科技创新特区H863计划05-06重点项目。

摘　　要：承力拖曳电力电缆由外层钢丝和内部电缆构成,外部钢丝承担张力载荷,内部电缆导线供电并传输信号。在复杂海洋拖曳环境中,缆中部导线绝缘层被铜屏蔽层刺穿发生短路,继续使用后,在远处湿端水下拖头部位发生打火故障,最终该拖缆共形成两处不连续的故障。针对该远端屏蔽层不连续位置打火的特殊故障现象进行深度剖析,分析认为屏蔽铜带发生破损后屏蔽层带电时屏蔽层下方的半绝缘导线会发生过热,并设计了模拟试验,进行故障复现,结果表明半绝缘层上流过的电流是导致电缆表面温度升高的主要原因,拖缆拖头部位的故障与拖缆中部的故障有关。研究结果有助于理解类似型号高压承力拖缆故障的机理,为工业电缆关于屏蔽层断裂,半绝缘导线发热引发的二次故障提供了理论依据,并对重型设备拖曳时拖曳缆工作状态、可能出现的故障,以及针对性加强设计提供宝贵经验。The drag power cable is composed of outer steel wire and internal cable,the external steel wire bears the tension load,and the internal cable conductor supplies power and transmits signals.In the complex marine towing environment,the insulation layer of the wire in the middle of the cable was punctured by the copper shielding layer,resulting in a short circuit.After continued use,a spark fault occurred at the remote wet end underwater towing head,and finally the towing cable formed two discontinuous faults.An in-depth analysis of the special fault phenomenon of ignition at the discontinuous position of the far end shielding layer was proposed.The analysis showed that the semi insulated wire under the shielding layer would overheat when the shielding layer was charged after the shielding copper strip was damaged.A simulation test was designed to reproduce the fault.The results show that the current flowing on the semi insulated layer is the main reason for the rise of the cable surface temperature,the failure of the streamer head is related to the failure of the middle of the streamer.The research is helpful to understanding the fault mechanism of similar types of high-voltage load-bearing streamers,and provides a theoretical basis for the secondary fault caused by the rupture of the shielding layer and the heating of the semi insulated conductor of industrial cables.It also provides valuable experience for the working state of towing cable,possible faults and targeted strengthening design when heavy equipment is towed.

关 键 词：拖曳拖缆 屏蔽铜带 远端打火 故障机理 

分 类 号：TM24[一般工业技术—材料科学与工程]