Class 2 (2nd Engineer) MET 📅 Mar 2019

Exam Question

With reference to A.C generators:

(a) Give a brief outline of the care and maintenance that should be given to the stator and rotor of an A.C. generator.

(b) Explain what is likely to occur if the driving power of one A.C. generator suddenly fails when two generators are running in parallel. What safety devices are usually provided for such events?

Reference Answer

(a) Care and maintenance of stator and rotor in an A.C. Generator:
Use a dry, lint-free cloth or compressed air to remove dust and debris from the stator and rotor windings. A vacuum cleaner may be necessary for stubborn deposits. Degreasing liquids can clean windings and terminals.
Carefully examine the windings and terminals for signs of damage (cracks, abrasion) or overheating.
Ensure that the air passages are clean and unobstructed to allow for proper cooling.

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