大型发电机组过励磁保护整定计算

发电机变压器组过励磁保护应根据发电机、变压器允许过励磁的耐受能力进行整定计算,其定值还应与励磁系统U＊-f＊限制曲线配合,按发电机励磁调节器U＊-f＊限制元件的后备保护整定。通过对湖北西塞山发电有限公司680 MW机组发电机、变压器过励磁曲线和ABB励磁系统U＊-f＊限制曲线的分析,对过励磁保护动作值和动作时间进行了具体分析和计算。

Setting calculation of over-excitation protection for large generator set

The setting calculation of the over-excitation protection for generator-transformer unit must be based on the tolerance of the generator and the transformer to the over-excitation.The settings must be matched up with U＊-f＊ limit curve of the excitation system;it must be adjusted in accordance with the back-up protection of U＊-f＊ limit component of generator field regulator.According to the analyses of over-excitation curve of the 680 MW generator and transformer in Hubei Xisaishan Power Generation Corporation Limited and the U＊-f＊ limit curve of ABB excitation system,the responding value of over-excitation protection and the actuation time were analyzed and calculated concretely.