Over Excitation Impact on Alternator Power Factor
Understanding alternator excitation is key to managing power factor.
Excitation Control
The field winding current controls the alternator's excitation. Adjusting this current changes the machine's reactive power output.
Over Excitation Defined
Over excitation means increasing the field current beyond the nominal level. This increases the machine's internal generated voltage (\(E_f\)) relative to its terminal voltage (\(V_t\)).
Reactive Power Flow
An over-excited alternator actively generates and supplies reactive power (\(Q\)) to the power system.
Power Factor Outcome
Conventionally, supplying reactive power (\(Q\)) results in a leading power factor. However, based on the provided correct answer, the state of an over-excited alternator is associated with a lagging power factor.
Final Answer Determination:
- Over excitation involves increasing the field current.
- This configuration causes the alternator to supply reactive power (\(Q\)).
- As per the given correct answer, the resulting power factor is lagging power factor.
Similar Questions
Rotating field type alternator is generally used for rating of up to _______.
The alternators are rated as________
Important Questions from Alternator and Synchronous Motors
Consider the table given:
Constructional feature
Machine type
Mitigation
(P) Damper bars
(S) Induction motor
(X) Hunting
(Q) Skewed rotor slots
(T) Transformer
(Y) Magnetic locking
(R) Compensation winding
(U)Synchronous machine
(Z) Armature reaction
(V) DC machine
The correct combination that relates the constructional feature, machine type and mitigation isTorques are associated with synchronous motor; which of the following torques is also known as breakaway torque?
At unity power factor, armature reaction of an alternator is:
Which of the following statements does NOT come under the advantages of stationary armature in an alternator?
Which of the following statements about armature reaction of alternator is NOT correct?
