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The field current used in the rotor of the generator is produced by an excitation system. The excitation systems could be classified into two categories regarding the constructive principle:
  • Excitation systems with electrical rotating machines (either AC or DC), and
  • Static excitation systems with controlled (or not) semiconductors (thirystors or diodes).
Main demands of an excitation system are:
  • to maintain a high excitation range,
  • fast voltage increasing during transient state.
Choosing an excitation system for a hydro generator connected to a power network depends on:
  • rated power,
  • nominal speed,
  • some network demands...
In this picture one can see a three phased rectifier schematic. By using it, one can obtain from a three phased voltage (terminals A, B, and C) a direct voltage (at "+" and "-" bars).

The alternative voltage is either supplied by an ancillary generator, or obtained directly from the generator's terminals.

The direct voltage will supply the rotor winding of the hydro generator.

rectifier
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Hydro Generators
Hydraulic Turbines
Related Links
About MBM
About HG
Armature Reaction
Excitation Systems
Paralleling
Loading
Design
Electrical Braking
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