微机发电机失磁保护新方案的研究

在发电机的各种保护中，发电机失磁保护是一个急待研究和完善的课题。中提出了4种典型的失磁保护方案，能够满足用户的各种需要，并方便用户的使用．．该方案对于由励磁绕组内部开路时引起的转子判据拒动问题，增加了逆无功闭锁的阻抗判据，避免了失磁保护的拒动，同时由于增加了逆无功元件，加长了延时，提高了可靠性。

Study on New Scheme of Microcomputer- Based Field Loss Protection for Generator

The generator field loss protection is a topic that should be studied urgently in various generator protections. Four kinds of typical scheme of field loss protection were put forward, which can satisfy the various needs of users and be facilitated for use of user. For the problem of miss operation of the rotor criterion occurred by open circuit of excitation winding inside, the impedance criterion of reverse reactive power block was added in this scheme, which avoided miss operation of field toss protection. At the same time, the time delay was increased and the reliability of protection was improved.