The performances of excitation control system must fit all the different operation conditions of generator, such as no load operation, loading, load rejection and different kinds of faults.
本文论述了励磁控制系统应满足发电机各种运行方式的要求，如负载运行、空载运行、系统故障等不同情况。
Self-excitation and over-voltage caused by generator load rejection with long lines occurs because of the capacitive current has a function to help the magnetic excitation of the generator.
发电机带长线路甩负荷时，因容性电流对发电机产生助磁作用从而使发电机发生自励磁和过电压。
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