Why generator need excitation


References

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.

Answering Seven Common Questions on Generator and Motor Operation

Rotating equipment is so common, yet so misunderstood, that even highly experienced electricians and engineers are often plagued with questions about their operation. This article will answer seven of the most commonly asked questions. The explanations are brief and practical due to space limitations; however, they will enable you to have a better understanding of this equipment.

Why generator need excitation

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I wasn’t very accurate in my OP. What I meant was permanent magnet generators (PMG) to power the AVR which in turn powers the exciter field for the exciter armature and rotating rectifier assy powering the actual field(maybe done with brushes on older gens?). All the generators I’ve personally been around have been Kato between 2000-2500 with PMGs mounted on the end of the rotor.

Why generator need 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.

Exciter discharge protection

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Why generator need excitation

Priority Applications (1)

GE’s Ex2100e Excitation Control system is a software enabled generator control system applicable for steam, gas and hydro generators. The EX2100e has configurations for both new installations and retrofit of existing systems. Ex2100e control hardware and software is an integral part of the Mark VIe control product line.

Modelling and Simulation of Static Excitation System in Synchronous Machine Operation and Investigation of Shaft Voltage

Among the various types of bearing currents discharge mode current or EDM is the most harmful causing erosion on the shaft and bearings. Life of machine is reduced by this effect. Large machine requires huge investments on shaft repair and bearing replacement. To arrest the premature bearing failure further study in this field is needed to eliminate the shaft voltage.

Why generator need excitation

The firmware solution includes:

The brushless excitation system works in the absence of commutator, slip rings and brushes. Instead of these components we are using Permanent Magnet Exciter and three phase main Exciter with silicon diode rectifier the system has generated. With this system we can avoid dust particles which cause a great maintenance cost. The complete structure of this excitation system is explained clearly in this review. Drawback of this system is presence of considerable exciter time constant which affects the rate of change of voltage.