有限元法计算交联电缆涡流损耗

电力电缆的导体交流损耗和金属屏蔽层涡流损耗是影响电缆群温度场分布和电缆载流量确定的重要因素。为确定电缆运行中的损耗,在考虑趋肤效应和邻近效应的基础上,利用有限元法对电缆群不同排列方式和接地方式下的导体交流损耗和金属屏蔽层涡流损耗进行了计算。计算结果表明,导体交流损耗随回路数增多、电缆间距减小而增大,金属屏蔽层损耗随回路数增多而增大,与电缆间距的关系与接地方式有关,单端接地时,金属屏蔽层损耗随间距增大而减小,双端接地时,金属屏蔽层损耗随间距增大而增大。

Calculation of Eddy Current Losses in XLPE Cables by FEM

Because of the skin effect and proximity effect,the ac losses in conductor are greater than dc losses in conductor.The ac losses in conductor and eddy current losses in sheath,for different laying modes and different grounding modes of cables are calculated by the Finite Element Method(FEM).By analyzing the calculation results,the relation among ac losses in conductor and loops as well as distance of cables are obtained.When the loops of cable bundles increase,the ac losses in conductor will increase too.When the distance of cables decreases,the ac losses in conductor will increase.The relation among eddy current losses in sheath and loops,distance of cables are obtained.When the loops of cables increase,the eddy current losses in sheath will increase.The eddy current losses in sheath are relevant to the distance of cables and the bonding mode.When the sheaths are bonded at only one end,the eddy current losses in sheath will decrease with the increase of the distance of cables.When the sheaths are bonded at both ends,the eddy current losses in sheath will increase with the increase of the distance of cables.