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Induction generator is classified based on _______________
the rotor speed (N < Ns or N < Ns)
type of slip (s) in the machine (positive or negative)
the reactive power received in the machine (arrangement of reactive power)
the active power flow in machine (direction of current)
the reactive power received in the machine (arrangement of reactive power)
Quick Trick: Remember that an induction generator cannot generate its own reactive power and always demands lagging VARs from an external source or capacitor bank; hence, its operation/classification primarily depends on the reactive power arrange...
Remember that an induction generator cannot generate its own reactive power and always demands lagging VARs from an external source or capacitor bank; hence, its operation/classification primarily depends on the reactive power arrangement.
Analyze Operating Principle
An induction generator operates by converting mechanical energy to electrical active power when driven above synchronous speed (N > Ns). However, unlike synchronous generators, it lacks an independent excitation system.
Identify Key Requirement for Classification
Because it lacks direct current excitation, it MUST absorb reactive power from an external source (grid or capacitor banks) to establish its rotating magnetic field. Thus, the supply/arrangement of reactive power dictates how the generator is classified (e.g., Grid-connected vs. Self-excited standalone induction generator).
A: Rotor speed condition N < Ns defines motor action, not generator action (N > Ns). B: Negative slip defines generating mode, but does not serve as the fundamental classification basis of the generator systems. D: Active power flow describes generating function, but active power direction alone does not classify the type/system of induction generator.
C is correct because induction generators rely inherently on externally supplied reactive power to build their magnetic field, making the arrangement of reactive power the defining classification criteria.
Questions on induction generators frequently test reactive power requirements. Always remember: induction generators absorb reactive power (Q) while supplying active power (P).