本文首先介绍了核电站选择自励无刷励磁系统的主要原因，分析了无刷励磁系统的构成和功能，重点分析了其起励和强励的特点，并对转子一点接地保护及其它励磁回路的保护作了应用分析，以及对灭磁方式及特点进行了说明，自励无刷励磁系统适合于大容量的机组，在核电机组中将有着广泛的应用。

The main reason of choosing self-shunt brushless excitation System in nuclear power station is firstly introduced in this paper，and the structure & function of brushless excitation system are analyzed, the characteristic of flashing excitation and boosting excitation are emphasized, rotor one-point earthing protection and other protection for excitation circuit are analyzed, and the method of de-excitation characteristic is described, self-shunt Brushless Excitation System is suitable for high capacity unit，it will has broad application in nuclear power station.