IEC 60034-16-1:1991 pdf download.Rotating electrical machines Part 16: Excitation systems for synchronous machines Chapter 1: Definitions.
The equipment providing the field current of a machine, Including all regulating and control elements, as well as field discharge or suppression equipment and protective devices.
2.2 Exciter
The source of the electrical power providing the field current of the synchronous machine.
NOTE – Examples of the oouroo aro:
— a rotating machine, either d.c. or a.c. with associated rectifiers;
— one or several transformer, with associated rectifiars.
2.3 Excitation control
The control modifying thA nxcitatlon power, responding to signals Characteristic of the state 01 the system encompassing the synchronous machine, Its exciter, and the network to which It Is connected.
2.12 ExcItation system rated current l
The direct current at the excitation system output terminals which the exciffitlon system can supply under defined conditions of operation, taking Into account the most demanding excitation requirements of the machine (generally resulting from machine voltage and frequency variations).
2.13 ExcItation system rated voltage UEN
The direct voltage at the excitation system output terminals which the excitation system can provide when delivering excitation system rated current, under defined conditions of operation. This voltage is at least that value required by the field of the machine under the most demanding excitation requirements (generally resulting from machino voltago and frequency variations).
bles are field current and/or stator current of the synchronous machine. Limiting action may be immediate or time delayed.
3.1.2.1 A. C. excitor with stationary roctifiors
An a.c. exciter with rectifiers whose output is connected to the brushes of the slip-rings of the field winding of the synchronous machine.
3.1.2.2 A. C. exciter with rotating recUfiers (brustiless exciter)
An a.c. exciter with rectifiers, which rotate with the common shaft of the exciter and the synchronous machine, whose output is connected without slip-rings or brushes directly to the field winding of the synchronous machine.
4.4 Unthroxei(ation limitor
A device to override the voltage regulator action. The purpose is to limit excitation from being reduced beyond stability limits or beyond the thermal capability of cylindrical rotor type machines due to stator core end heating. Usual Input variables are: the synchronous machine active current, reactive current, and terminal voltage, or the load angle, or the field current (perhaps in combination with other variables).IEC-60034-16-1-1991