抽水蓄能电站发电机变压器组差动保护配置探讨

Layout and Analysis of Generator/motor-transformer Unit Differential Protection in Pumped Storage Power Station

抽水蓄能电站机组为一机双向运行,其运行工况复杂,相序切换、抽水方向启动、背靠背启动等特殊工况下,一次设备状态变化多样,机组及其出口变压器的继电保护配置随之变得非常复杂,既要考虑各种工况下机组与变压器要有完整的保护,又要考虑各种工况转换过程保护的正确投退,以满足保护配置的快速性、选择性与可靠性要求。本文通过几种典型的应用案例,简要地阐述了抽水蓄能电站发电机变压器组差动保护配置相关的几个重要环节,并给出了合理化的配置建议,供相关专业人员参考与研究。

The synchronous machine in pumped storage power station can work as a generator or a motor.It’s characterized by various operating conditions like as phase reversal,SFC starting up,backto-back starting up via the switching over of the disconnector and CBs.These have the great impact to the protection systems of the generator/motor-transformer unit.To actualize the fast,selective and reliable feature of protection functions,special attentions must be taken into account,e.g.,fully redundant configuration and correct activation/de-activation under any operating conditions.This paper is to briefly state the key measures and to propose the optimized layout via some practical layouts.Hopes these references will benefit for the further study for other engineers.