In order to calculate the short-circuit impedance of the transformer with split types of windings exactly,the multi-winding inductance matrix(IM) for the multi-branch of the high-voltage winding and one of the low-voltage split winding was first established by three-dimensional finite element method(FEM) with ANSYS software.
为准确计算出分裂变压器高、低压绕组间的短路阻抗,首先采用ANSYS的三维静态磁标势法数值计算得出高压多并联支路与单个低压绕组间的多绕组电感矩阵,并依据电路理论将其简化为等效双绕组电感矩阵,进而得到短路阻抗百分比,并推导了高压各并联支路电流分配,最后给出一个概念设计的分裂式高温超导变压器算例。
The new low molecular weight fracturing fluid,without breaking agent,is developed which is provided with lower residue and harm,and then recycled specially against low rate of permeation oilfield.
针对低渗、特低渗油田,开发出一种不需破胶剂、低残渣、低伤害、可循环再利用的新型低分子压裂液。