Electrical Engineering ⇒ Topic : Compound Wound Generators Characteristics
Compound Wound Generators
Over compound generator. An over compound generator is one whose terminal voltage rises with the application of load so that its full-load voltage exceeds its no-load voltage (negative regulation).
Flat compound generator. A flat compound generator has a load-voltage characteristic in which the on-load and full-load voltages are equal (zero per cent regulation).
Undercompound generator. An undercompound generator has a load characteristic in which the full load voltage is somewhat less than no-load voltage, but whose aiding series-field ampere-turns cause its characteristic to have better regulation than an equivalent shunt generator
Fig. (a) Connection diagrams for a compound generator.
Fig. (b) Current directions in series and shunt-field coils of cumulative and differential compound generators
Fig. (c) External load voltage characteristics of cumulative and differential compound generators
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