Abstract: Based on the demand for safety and rapidity of de-excitation, this paper puts forward the technical scheme and the control principle of de-excitation process of a new de-excitation system, and analyzes the de-excitation process under no-load false forced excitation fault and short circuit fault at the end of the generator. It shows that the new technical scheme of de-excitation can reduce the arc voltage of the de-excitation breaker on the premise of ensuring the safety and rapidity.

Key words: generator, field breaker, no-load false forced excitation, pulse locking

摘要： 针对发电机组灭磁安全和快速性的需求分析，提出一种新灭磁系统的技术方案及灭磁过程控制原理，并分析发电机空载误强励故障及机端短路故障下发电机的灭磁过程，表明在保证安全和快速灭磁的前提下，新型灭磁技术方案可以降低灭磁开关弧压的要求，对大型发电机组的快速灭磁装置设计及研究具有一定指导意义。

关键词: 发电机, 磁场断路器, 空载误强励, 脉冲闭锁