无刷旋转励磁发电机组励磁绕组接地保护系统研制和工程应用

Research and Project Application of Field Winding Ground Fault Protection System on Brushless Rotating Excitation Generator

针对已有无刷旋转励磁发电机组励磁绕组接地保护(MRET)存在的诸多问题,提出了新的励磁绕组接地保护系统技术方案,详细阐述了系统结构和基本工作原理,并就注入方波电压式励磁绕组接地保护原理、无线通信方式、自适应方波频率调整技术、数字化保护技术等关键技术进行了分析,该系统在若干台无刷旋转励磁发电机组的应用表明,该系统完全能够满足无刷旋转励磁发电机组的应用需求。

Regarding present application problems of field winding ground fault protection system （MRET） on brushless rotating excitation generator,a new rotating field winding ground fault protection system scheme is proposed.The system structure and basic principles are discussed in detail.Several key techniques,including injection rotor ground protection,wireless communication technology,auto-adjustability of power frequency and digital protection,are analyzed.The field operation on several generators greater than 300 MW proves validity and reliability of proposed protection system.