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.