Class 2 (2nd Engineer) MEP 📅 Jun 2018

Exam Question

(a) Describe the preventive maintenance carried out on the circuit breaker for an A.C. generator.

(b) Explain the sequence of events that might occur if the breaker opens on a short circuit and state the check you would require following such event.

Reference Answer

(a) Preventive Maintenance on Circuit Breaker for an A.C. Generator:
Use a vacuum cleaner and a low-lint, clean cloth to remove dust and debris from insulating materials. Apply manufacturer-recommended cleaning solvents if necessary.
Look for signs of arcing, thermal damage, rust, corrosion, deformation, or physical damage on components. Examine the contacts for discolouration, wear, and pitting.
Clean the contacts and ensure proper contact alignment. Check for adequate contact pressure and verify that all contacts close simultaneously when manually operated. Replace contacts or springs as a set to maintain uniform performance.

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