Field failure protection in an alternator is provided to detect:
Loss of excitation current in the synchronous generator field winding
Field failure protection in an alternator (synchronous generator):
- Detects loss of excitation current in the DC field winding.
- When field is lost, the machine loses synchronism and starts operating as an induction generator — drawing reactive power from the grid and causing instability.
- The protection system detects the loss of field and trips the generator before damage occurs.
It does NOT monitor illumination intensity, paint thickness, or oil color — those are unrelated to electrical protection.
Similar Questions
Why does a squirrel cage induction motor not develop maximum starting torque?
Which set of statements correctly describes the steady state speed-torque characteristics of a three-phase synchronous motor? i) Runs at constant synchronous speed ii) Starting torque is zero iii) Torque increases significantly with slip iv) Not suitable for variable speed drives v) Maintains speed under varying loads
Which point or region represents the Pull-out Torque in the shown torque-speed characteristic of a 3-phase induction motor?
The speed of a synchronous motor depends on:
When an alternator operates at unity power factor, the armature current:
Important Questions from Alternator and Synchronous Motors
The armature current of a synchronous motor has large value for-
An alternator has 20 poles and running at 300 RPM will generate alternating voltage and current whose frequency is-
Synchronous motor when used for power factor improvement should be-
In an alternator, the _______ current is generated in the stationary stator.
The speed with which the turbo alternators operate are-
