电力变压器连续式绕组导线换位优化设计

Optimized Design of Continuous Winding Conductor Transposition for Power Transformer

大容量变压器绕组的多根并绕导线采用传统不完全换位时,会生产较大的环流损耗和温升,通过绕组多根并绕导线的优化换位,可以减少绕组环流损耗,降低绕组的温升。通过将绕组的不完全换位改进为完全换位,保证绕组每根导线总长度接近或相同,每根导线在漏磁场分布中的平均位置一致或者相同,同时通过对并绕导线传统型换位、改进型a换位、改进型b换位在线圈端部的漏感电势Δθ进行计算,得出了绕组采用不同换位方式时线饼排列的最佳方式,最大限度地降低绕组的环流损耗,降低变压器的负载损耗和绕组温升。通过样机SSZ13-20000/110变压器例行试验结果表明采用改进型换位的绕组与采用传统型换位的绕组相比:环流损耗降低99.4%,温升降低3 K,同时通过负载损耗和绕组温升实测值与设计值比较,验证了绕组采用优化换位的方案是完全可行的,变压器节能降耗效果明显,绕组的寿命得到显著提高。

Large capacity of power transformer causing relatively high eddy current loss and temperature rise when winding composed of several paralleled conductors were transposed to traditional incomplete transposition,by optimizing winding conductor transposition,eddy current loss and temperature rise of winding could be reduced.Through the calculation of the leakage inductance potentialΔθat end winding of traditional transposition,improved a transposition and improved b transposition for paralleling winding,the best arrangement of winding had been obtained in different transposition,which minimized the circulating current loss of the winding,reduced the load loss of transformer and temperature rise of winding.Based on prototype SSZ13-20000/110 transformer routine testing results,comparing between optimized winding conductor transposition and traditional transposition:eddy current loss can be decreased 99.4%and temperature rise could be reduced 3 K.Concurrently,by comparing the testing results and design values,feasibility of the optimized transposition of winding has been verified,which increase the effects of energy conservation and winding life expectancy of power transformer significantly.