介绍了牵引发电机和同步励磁机励磁系统的组成和用途以及调节组件及其与机车电气线路的连接。对电流电压传感器、励磁机输出整流器、发电机故障的励磁组件等电路的工作原理及组成也作了逐一介绍。 The composition and use of excitation systems for traction generators and synchronous exciters as well as the adjustment of components and their connection to locomotive electrical circuits are presented. On the current and voltage sensors, exciter output rectifier, generator fault excitation components and other circuits working principle and composition also made one by one introduced.