A. Excite the poles of generator.B. Excite the poles of main exciter.C. Provide starting torque to main exciter.D. Provide starting torque to generator.Answer: B. Excite the poles of main exciter.
Explanation: Pilot exciter:- To excite the field winding of the rotor of the synchronous machine, direct current is required.
- Direct current is supplied to the rotor field of the small machine by a DC generator called exciter.
- A small DC generator called pilot generator, supplies the current to the exciter.
- A pilot exciter is a small AC generator with a permanent magnet mounted on the rotor shaft and the three phase winding on the stator.
- It provides the field current of the exciter. The exciter supplies the field current of the main machine.
- The DC output of the main exciter is given to the field winding of the synchronous machine through brushes and slip rings. The pilot exciter is excluded in smaller machines.
- In industrial applications basically, 3 types of exciters are used for an alternator.
- Static exciter
- Permanent magnet/Brushless Exciter
- DC/Pilot exciter
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To maintain the stability of the overall system the synchronous generator should respond quickly for sudden changes in the load and in order to attend these two dc generators are used, one as the main exciter and the other as a pilot exciter.
- A pilot exciter is used to make the excitation of the generator independent of an external power source.
- A pilot exciter is mounted on the rotor shaft and it excites the field coil of a separately excited dc generator called “ the main exciter.
A. Excite the poles of generator.
B. Excite the poles of main exciter.
C. Provide starting torque to main exciter.
D. Provide starting torque to generator.
Answer: B. Excite the poles of main exciter.
Explanation:
Pilot exciter:
- To excite the field winding of the rotor of the synchronous machine, direct current is required.
- Direct current is supplied to the rotor field of the small machine by a DC generator called exciter.
- A small DC generator called pilot generator, supplies the current to the exciter.
- A pilot exciter is a small AC generator with a permanent magnet mounted on the rotor shaft and the three phase winding on the stator.
- It provides the field current of the exciter. The exciter supplies the field current of the main machine.
- The DC output of the main exciter is given to the field winding of the synchronous machine through brushes and slip rings. The pilot exciter is excluded in smaller machines.
- In industrial applications basically, 3 types of exciters are used for an alternator.
- Static exciter
- Permanent magnet/Brushless Exciter
- DC/Pilot exciter
- To maintain the stability of the overall system the synchronous generator should respond quickly for sudden changes in the load and in order to attend these two dc generators are used, one as the main exciter and the other as a pilot exciter.
- A pilot exciter is used to make the excitation of the generator independent of an external power source.
- A pilot exciter is mounted on the rotor shaft and it excites the field coil of a separately excited dc generator called “ the main exciter.
