SNAT634PAC 61049452D 用于控制交流发电机

SNAT634PAC 主励磁机和先导励磁机可以由主轴驱动，也可以由电机单独驱动。直接驱动的励磁机通常是首选的，因为它们保持了运行的单位系统，并且励磁不受外部干扰的影响。

主励磁机的额定电压约为400 V，其容量约为交流发电机容量的0.5%。涡轮交流发电机的励磁机故障非常频繁，因为它们的速度很高，因此提供单独的电机驱动的励磁机作为备用励磁机。

2.交流励磁系统

SNAT634PAC 交流励磁系统由交流发电机和直接连接到主交流发电机轴的晶闸管整流桥组成。主励磁机可以是自励的，也可以是他励的。交流励磁系统可以大致分为两类，下面将详细说明。

SNAT634PAC 61049452D 用于控制交流发电机

SNAT634PAC main exciter and pilot exciter can be driven by spindle or by motor alone. Direct-drive exciters are usually preferred because they maintain the operating unit system and the excitation is not affected by external interference.

The rated voltage of the main exciter is about 400 V and its capacity is about 0.5% of the capacity of the alternator. Turbo alternator exciters fail very frequently because of their high speed, so a separate motor-driven exciter is provided as a backup exciter.

2. Ac excitation system

SNAT634PAC AC excitation system consists of an alternator and a thyristor rectifier bridge directly connected to the main alternator shaft. The main exciter can be self-excited or separately excited. Ac excitation systems can be broadly divided into two categories, which are described in detail below.