Power plant generators – what is excitation? Types Of Excitation Systems

The electric generators work on the basis of the electromagnetic induction Faraday. The magnetic field is a significant part of the Faraday’s electromagnetic induction. The magnetic field is obtained through DC power source from an Exciter. This exciter is a form of the generator system. It is further discussed below in detail.

The generator produces the electric field at a constant voltage. By controlling the magnetic field, the voltage output of the generator can be controlled.

Excitation system is circled in the below representation of power station-


How is the magnetic field produced and controlled by a large generator?

Also Read: What Is Nuclear Reactor, Its Types, Parts And Working

The magnetic flux is necessary in power generators for the production of the electric power. This magnetic flux is produced by coiling the rotor or the field in a generator. To excite the magnetic field, a rotor is required. The rotor is a rotating electromagnet which requires a DC electric power source for exciting the magnetic field and this power is provided to the rotors by the Exciter.

After understanding the main function of the exciter, now let us have a look at the types of the exciter. There are three types of Exciter systems – 

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