TPY级电流互感器在班多水电站中的应用

Application of TPY Current Transformer in Banduo Hydropower Project

具有暂态误差性能的TPY电流互感器广泛应用于高电压等级电力系统及大容量发电机变压器组的差动保护中。文章简要介绍了班多水电站变压器差动保护选择TPY电流互感器的原因,并介绍了TPY电流互感器参数选择及校验的计算方法。指出了针对中小型机组接入大系统,选择TPY型电流互感器参数的重点,并列举说明了校验TPY电流互感器等效二次极限电动势及暂态误差不满足规范要求情况下的解决办法。

TPY CT with property of transient error is widely applied in differential protection of HV power system and generator-transformer set with large capacity.In this paper,causes for selection of TPY CT applied by the differential protection of transformer,Banduo Hydropower Project are introduced as well as calculation methods for parameter selection and calibration of TPY CT are described.Key points for selection of parameters for TPY CT are pointed out aiming at medium and small units to be introduced to large system.Meanwhile,resolution for calibration of equivalent secondary limit generated voltage and transient error of TPY CT,which are not satisfied with code requirements,are listed and stated.