大容量三相发电机变压器低压引线方案选择

Selection of Low Voltage Lead for Large Capacity Three-phase Generator Transformer

为了减小大容量三相发电机变压器漏磁场在低压引线里引起的涡流损耗,提出了多根并联铜排连接、多根并联CTC导线连接2种不同的低压引线设计方案。使用工程制图软件对实际产品的2种方案分别三维建模,通过MagNet电磁仿真软件进行磁场的有限元分析,模拟算出2种方案低压引线各区域的漏磁,并根据漏磁最终计算出引线各处的涡流损耗。模拟和计算结果表明,2种引线设计方案均是可行的,只是多根并联CTC导线连接产生的涡流损耗远小于多根并联铜排连接产生的涡流损耗,实际应用中需根据低压引线损耗的裕度选择合适的方案。

In order to reduce eddy current loss in low voltage lead caused by leakage magnetic field of large capacity three-phase generator transformer,two different designs of low voltage lead connected by multiple parallel copper bars and multiple parallel CTC wires were proposed. The engineering drawing software was used to make three-dimensional modeling for the two schemes of the actual product,and the magnetic field finite element analysis was carried out by MagNet electromagnetic simulation software to simulate and calculate the magnetic flux leakage in each area of the low voltage lead of the two schemes,and finally the eddy current loss in each area of the lead was calculated according to the magnetic flux leakage. The simulation and calculation results show that both of the two design schemes are feasible,but the eddy current loss caused by the connection of multiple parallel CTC wires is much less than that caused by the connection of multiple parallel copper bars. The suitable scheme should be selected according to the margin of low voltage lead loss in practical application.