大型发电机变压器组保护用电流互感器选型及应用

大型发电机变压器组保护用电流互感器的主要问题为是否应考虑系统时间常数大、暂态饱和严重及剩磁的不利影响，采用TPY型电流互感器，并根据大型机组的具体情况确定其相关技术参数，开发适用的产品，是解决这些问题的有效途径。根据对国产大型发电机和变压器技术参数分析和计算提出的电流互感器的典型参数而研制的电流互感器可供工程使用。

Selection and application of protective CT for large generator-transformer unit

The major considerations of protective CT for large generator-transformer unit are the big system time constants,serious transient saturation and adverse effect of remanent flux.The effe ctive ways to resolve these problems are the use of TPY CT,the determination of related technical pa-rameters according to the real conditions of large unit and the development of appropriate products.The CTs developed and manufactured according to the typical parameters are given for engineering application,which are specified based on the analysis and calculation of the technical parameters of domestic larger generators and transformers.