6.4.2. Direct current shunt generator
The direct current shunt generator is a direct current generator in which the exciter winding is switched parallel to the rotor winding.
(1) Clockwise, (2) Anti-clockwise
The dependence of terminal voltage U on load current I can be deduced from the curve in Figure 103. Terminal voltage declines as load current increases. If the generator is, in addition, loaded over and beyond the rated current, the terminal voltage declines sharply. Only minimal voltage is induced where the rated current increases threefold. Consequently, the required current power need no longer be provided. Terminal voltage is zero during short-circuiting.
1 U0 in no-load operation
The shunt generator is short-circuit-proof.
An alteration of the strain field actuator of the exciter current and, thus, also of the exciter flow serves to ensure constant voltage given greater load current.
The direct current shunt generator is used as exciter generator in three-phase generators for ensuring power supplied on ships and planes.
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