海南联网海底电缆护套绝缘监测方法研究

Research on Submarine Cable Shield Insulation in Hainan Interconnection Project

为监测海南联网工程中海底高压电缆的绝缘状况,根据海底电缆结构参数和运行条件特点,对海底电缆护套中的电流进行了研究。基于Matlab仿真计算软件,对护套中的感应电流和电容电流分别建立模型,讨论了电缆护套绝缘在各种故障下护套电流的响应特性。研究发现,护套绝缘对护套中的感应电流无明显影响,而电容电流不仅与护套绝缘水平有关还可反映外绝缘故障点的位置。

In order to inspect the submarine cable shield insulation,this paper studies the shield insulation according to the shield current and based on the cable＇s configuration, parameter and operation condition. With the model of inductive current and capacitance current based on Matlab,the paper discusses the characteristic of the inductive current and the capacitance current under the fault circumstance of the cable shield insulation in detail. The research discovers that when the submarine cable shield insulation has grounding problem,the inductive current in the shield is not influenced very much, while the capacitance current not only reflect the shield insulation＇s problem,but also can localize the position of the failure cable.