海工电力系统电缆截面选择方法

Selection method of cables cross-section for offshore power unit

针对海工电力电缆截面选择缺乏完整选择要素的问题,提出了初步选择电缆后逐步验证的方法。该方法先通过敷设系数、环境温度、额定电流和开关允通等因素初步选择电缆截面,然后验证在此截面下的电缆是否满足末端短路和动静态压降的要求,如不满足,逐步加大电缆截面直到满足要求。本文通过案例表明缺乏完整的电缆截面选择要素会导致电缆截面选择不足。

For solving the problem that the cross-section selection of power cable for offshore unit is short of complete selection elements,a method of gradual verification after basic selection is put forward.In this method,the cable cross-section is preliminarily selected,based on laying coefficient,ambient temperature,rated current and let through.And then the cable is verified to meet the requirements of end of line fault and dynamic and static voltage drop.If not,the cable cross-section will be gradually increased until the requirements are met.This paper shows that the lack of complete cable cross-section selection elements will lead to insufficient selection of cable cross-section.