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《小型水力发电站设计规范》送审稿中提出,500千瓦及以上机组采用半导体励磁系统应装设直接反应发电机失磁的专用保护。本文针对失磁保护常用结线中存在的问题,提出用发电机低压过流保护作失磁保护的定子判据,设计出自复激和自并激发电机的失磁保护结线,达到了既不增加继电器,又解决了常用结线中存在问题的目的。这种改进后的失磁保护结线,已在实际工程设计中采用。
“Draft Design Specification for Small Hydropower Stations” submitted for review, the use of semiconductor excitation system for units of 500 kilowatts and above should be equipped with a special protection of direct response generator demagnetization. In this paper, aiming at the problems existing in common connection of loss-of-field protection, the stator criterion of loss-of-field protection by generator undervoltage overcurrent protection is proposed, and the demagnetization protection junction of self-excitation and self-excitation motor is designed. Increase the relay, but also solve the common problems in the connection of the purpose. This improved demagnetization protection junction, has been used in the actual engineering design.