Brushless Exciter System Concepts

The video tutorial explains how the output voltage of a generator is controlled by adjusting the excitation current. It covers the static excitation system, which uses a rectifier and voltage regulator to manage the excitation, and the brushless exciter system, which eliminates the need for collector rings by using a rotating rectifier. Both systems are designed to maintain the generator's output voltage at a set point, with options for manual and automatic control.

What happens to the generator output voltage when the excitation current is increased?

• It remains the same.

• It fluctuates randomly.

• It decreases.

• It increases.

In a static excitation system, how is DC current supplied to the rotor winding?

• Via a battery pack.

• Directly from the generator bus.

• Through collector rings on the shaft.

• Through brushes and slip rings.

What is the primary function of the field voltage regulator in the excitation system?

• To maintain the set point voltage.

• To control the firing of the rectifier.

• To disconnect the generator from the grid.

• To increase the generator speed.

What is the role of the AC voltage controller in the excitation system?

• To increase the generator's mechanical power.

• To monitor and adjust the generator's output voltage.

• To disconnect the generator from the grid.

• To provide backup power during outages.

What is the purpose of the manual control mode in the field voltage regulator?

• To allow automatic adjustments.

• To enable direct operator control of excitation.

• To increase the generator's speed.

• To disconnect the generator from the grid.

How does the brushless exciter system differ from the static system?

• It uses collector rings instead of brushes.

• It has a stationary magnetic field on the rotor.

• It uses a small AC generator and diode rectifiers.

• It requires manual control only.

What eliminates the need for collector rings in a brushless exciter system?

• The use of a battery pack.

• The presence of a rotating rectifier.

• The use of a larger transformer.

• The manual control mode.

How is the strength of the exciter magnetic field adjusted in a brushless exciter system?

• By changing the generator speed.

• By controlling the DC current flow through the field winding.

• By adjusting the AC input voltage.

• By using a larger transformer.

What supplies the DC field current in a brushless exciter system?

• A large static rectifier.

• A nearby cabinet rectifier.

• A battery pack.

• The main generator bus.

What is the effect of adjusting the firing of the THS in the excitation system?

• It changes the generator's mechanical power.

• It adjusts the DC voltage level.

• It disconnects the generator from the grid.

• It increases the generator's speed.