Generator excitation


Power Plant Generators: What is Excitation?

Electric generators work on the principle of Faraday’s electromagnetic induction. The essential part of this principle is the magnetic field. The magnetic filed is produced from a DC power source from an Exciter that is part of the generator system. Read on for more.

Excitation in generators

Electric generators work on the principle of Faraday’s electromagnetic induction. The essential part of this principle is the magnetic field. The magnetic filed is produced from a DC power source from an Exciter that is part of the generator system. Read on for more.

What is the purpose of exciter in generator?

1st and the 3rd have a dedicated main exciter machine.The 2nd one has a power electronic based system to power the rotor. In order for the excitation system to work, both the pilot exciter and the main exciter have to work. There is no choice.

Generator excitation

Types of Excitation System

Definition: The system which is used for providing the necessary field current to the rotor winding of the synchronous machine, such type of system is called an excitation system. In other words, excitation system is defined as the system which is used for the production of the flux by passing current in the field winding. The main requirement of an excitation system is reliability under all conditions of service, a simplicity of control, ease of maintenance, stability and fast transient response.

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Generator excitation

Generator & Exciter

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Generator excitation

Documentation

In large alternators, the excitation system is provided by a small synchronous machine connected on the same shaft as the main synchronous generator. Current rectification is performed by a rotating diode bridge mounted on the synchronous machine shaft, thus avoiding slip rings for providing DC power to the synchronous generator field. Mechanical coupling of the Synchronous generator and the Exciter is done by using speed as mechanical input for the Exciter machine.

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.