华东电网500kV主变备用适用性的初步研究

Applicability of standby transformer for 500 kV main transformers of East China Power Grid

以浙江电网1 000 MVA容量的500 kV主变乔司2号变为例,介绍以现有的250 MVA容量500 kV单相变压器备品更换存在缺陷的333 MVA容量500 kV单相变压器的可行性和适用性。选取华东全网作为研究和计算对象,采用德国西门子公司电力系统仿真软件包NETOMAC,在NETOMAC平台上,开发出通用的三相三绕组变压器模型及算法用于三相不平衡潮流计算。

Taking the 1000 MVA/500 kV Qiaosi No. 2 main transformer of Zhejiang Power Grid as an example, the feasibility and applicability of using the 250 MVA/500 kV single-phase standby transformer to replace the defective 333 MVA/500 kV single-phase transformer are studied. Making the East Chins Power Grid as the object for study and calculation, the NETOMAC of Siemens was used to develop a universal model and algorithm for three-phase three-winding transformers to calculate the three-phase unbalanced load flow. Study shows that the above scheme is applicable.