GENERATOR SELECTION CONTENTS - Diesel Generator
GENERATOR SELECTION CONTENTS - Diesel Generator
GENERATOR SELECTION CONTENTS - Diesel Generator
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SECTION 4131<br />
January, 1990<br />
Page 4<br />
This combines the brushless style of machine with the open loop transformer type of control system. (See machines<br />
described under figure 1 and figure 3). When rotating, the residual magnetism causes an output voltage, a fixed<br />
proportion of it being rectified and fed to the exciter field. Output voltage will be built up in the way described previously<br />
until the proportion of output voltage fed to the exciter field is just enough to sustain that voltage. The machine and<br />
control gear are designed so that this happens at the nominal output voltage of the machine. Compensation for load<br />
current is achieved by using a transformer to obtain a voltage proportional to load current. This voltage is rectified and<br />
used to increase the exciter field strength thereby sustaining the output voltage on load. The Newage Stamford a.c.<br />
generators with a Series 5 excitation system are of this type.
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