光通信研究, 2017 (2): 40, 网络出版: 2017-05-03  

三芯光纤复合海缆接地故障有限元建模与仿真

Finite Element Modeling and Simulation of the Ground Fault of Three-Core Fiber Composite Submarine Cable
作者单位
华北电力大学 电子与通信工程系, 河北 保定 071003
摘要
为了获取三芯光纤复合海底电缆发生接地故障时的电热特性, 利用电热耦合有限元法建立了单相接地故障的有限元模型。在海缆绝缘层建立一个贯穿铜导体与铅合金护套的击穿电阻模拟接地故障, 选用SOLID69、SOLID90单元仿真海缆导体层及非导体层, 采用智能划分和扫掠划分相结合的方式对建立的海缆模型进行网格划分, 通过仿真分析获得故障电流分布和缆体温度分布。结果表明, 海缆在发生接地故障时主要表现为铜导体温度上升, 故障发生后, 填充层内的光单元温度也随之上升, 并可根据光单元温度的最高点对故障进行定位, 为利用分布式光纤传感技术监测海缆的电气故障提供了理论依据。
Abstract
In order to obtain the electric heating characteristics of three-core fiber composite ground faults, the finite element model of single phase ground fault is established by the electro-thermal coupling finite element method. We first establish a through copper conductors and lead alloy sheathed cable breakdown resistance in the insulating layer to simulate the occur of grounding fault. Then we use the finite element software SOLID69, SOLID90 to simulate the submarine cable conductor layer unit and nonconductor layer. We also combine the intelligence division and sweep division methods to mesh cable model. The temperature distribution of fault current distribution and cable body are obtained through simulation. Results show that the cable in the ground fault occurs with increasing temperature of copper conductor. Due to the ground fault, the fiber unit's temperature within the layer also increases. We can find the fault location according to the highest point of light unit temperature. Our proposed method provides a theoretical basis for the electrical fault monitoring when using the distributed optical fiber sensing technology.

刘娟, 杨志, 吕安强. 三芯光纤复合海缆接地故障有限元建模与仿真[J]. 光通信研究, 2017, 43(2): 40. LIU Juan, YANG Zhi, Lü An-qiang. Finite Element Modeling and Simulation of the Ground Fault of Three-Core Fiber Composite Submarine Cable[J]. Study On Optical Communications, 2017, 43(2): 40.

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