枕头坝一级水电站发电机变压器组差动保护TPY 级电流互感器的选型及应用

摘要

常规5P（10P）级电流互感器存在暂态饱和及剩磁问题，很容易造成发电机及变压器差动保护的误动。文章从电流互感器的使用现状出发，阐述了500 kV变压器及机组差动保护采用TPY级电流互感器的必要性，并结合实际工程案列对TPY级电流互感器的暂态参数进行了计算，为下一步工程设计和设备采购提供了依据。%The conventional Class 5P(10P) CT is with transient saturation and residual magnetism, which easily result in malfunction of the differential protection of generator andtransformer .In view of the CT application status, necessities ofapplication of Class TPY CT for the differential protection of 500 kVtransformer and unit are described in this paper.Based on the engineering practice, furthermore, the transient parameters of the Class TPY CT are calculated.These provide design and equipment procurement with basis.