EXPERIMENT: SELF-EXCITED D.C. SHUNT GENERATOR Make CONCLUSION and RECOMMENDATION

Question

EXPERIMENT:
SELF-EXCITED D.C. SHUNT GENERATOR

Make CONCLUSION and RECOMMENDATION in this experiment. At least ONE PARAGRAPH. No need to draw illustrations.

PROCEDURES 1. Before performing thie experiment, ensure firet that the bruahee of the DC Motor/Generator are adjueted to the neutral point 2. Couple the Synchronoue motor ueing a timing belt. Then connect the eet-up hown n Fig. 4.1 Synchronous Generator DC MOTOR GENERATOR 120/208 Vac Fig. 4.1 3. Connect the terminal 4, 5, and 6 of the eynchronoue motor windnge to wye connection and the other ende (termindle 1, 2 and 3) to a fixed three phase AC source, termindle 1, 2, 3 4. Connect the shunt terminale of the DC generator in seriee with the field rhecetat. Then connect the eeriee combination (ehunt field and field rheoetat) acroee the terminde of the armature,

Explanation / Answer

A self excited DC machine experiment as mentioned in above problem, as the brushes of the machine are adjusted to neutral point, armature reaction drop will be negligible.

Let us discuss the characteristics obtained from the experiment; No load voltage(when RL= infinity, Terminal voltage is 7.92 V and voltage regulation is zero and so is the load current.

As the load RL decreases , load current delivered by generator increases which further decreases the voltage thereby increasing the voltage regulation.

As the load current crosses 20A, terminal voltage falls steeply , so it is not advisable to operate DC generator beyond this point since, the ohmic drop and armature reaction drop worsens the voltage regulation.

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