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Class 4 (4th Engineer) MET 📅 Sep 2025

Exam Question

(a) State the necessary conditions required prior to the synchronizing of electrical alternators. (6)

(b) Describe the type of cumulative damage that may be caused when alternators are incorrectly Synchronized. (6)

(c) Explain how the damage referred to in (b) can be avoided/reduced. (4)

Reference Answer

### (a) Necessary Conditions Required Prior to Synchronizing of Electrical Alternators
To ensure safe and stable parallel operation of alternators, several critical conditions must be meticulously met before connecting an incoming alternator to an energized busbar. Failure to adhere to these conditions can lead to severe damage and system instability.
* **1. Terminal Voltage Matching:**
* The terminal voltage of the incoming alternator must be precisely matched, or be very close (typically within ±5%), to the busbar voltage.

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