采用充水电缆沟敷设方案的海缆登陆段载流量计算

Calculation on Carrying Capacity of Landing Section of Submarine Cable Laying in Full-water Cable Trench Way

为了检验近海风电场海缆登陆段由土壤直埋改为充水电缆沟敷设的载流量提升效果,建立了充水电缆沟内二维流–热耦合求解的数学模型,利用COMSOL Multiphysics软件对某条置于充水电缆沟的海缆载流量进行计算,得到沟内流场和温度场分布,验证了模型的正确性。由于水的自然对流可有效地改善电缆的散热条件,与直埋时相比,采用充水电缆沟敷设方案的海缆载流量提升了43.8%。基于该模型仿真分析了不同因素对充水电缆沟内海缆载流量的影响规律:电缆沟高度或宽度增大时,载流量均会增大,但增大宽度比增大高度能带来更明显的载流量提升效果;海缆在沟内的放置高度变化对载流量基本无影响。

In order to check effect in improving carrying capacity of the landing section of submarine cable near to the off-shore wind power farm by changing its laying way from soil bury to full-water cable trench, this paper model of 2D flow-heat coupled solution for the full-water cable trench. By using COMSOL Multiphysics to calculate carrying capacity of the submarine cable in one full-water cable trench , it obtains flow filed and temperature verifies accuracy of themodeL Because natural convection of water can effectively improve radiating conditions of the ca-ble , carrying capacity of the submarine cable laying in fuU-water cable trench way has improved by 43. 8%〇 compared with that of the submarine cable laying bury way. On the basis of this model , this paper also analyzes influence rules of different factors on carrying capacity of the submarine cable in full-water cable trench. It discovers carrying capacity of the submarine cable will increase with increase of height or width of the cable trench , but increase of provement of carrying capacity while changes of placing height of the cable has no influence on carrying capacity.