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Class 4 (4th Engineer) MET 📅 Jul 2025

Exam Question

(a) State the conditions, which must be satisfied before an a.c. generator can be paralleled with live bus-bars. (4) 

(b) Sketch a lamp-bright configuration for synchronizing lamps. (8) 

(c) Discuss the advantages & disadvantages of the lamps-bright system over the lamps-dark system. (4) 

Reference Answer

### (a) Conditions for Paralleling an AC Generator (Synchronizing)
Before an incoming alternator can be safely connected in parallel with live bus-bars, four critical conditions must be satisfied. Failure to meet these conditions will result in severe electrical and mechanical stresses, potentially causing damage to the generator, prime mover, and switchgear. These conditions are:
1. **Correct Phase Sequence:**
* **Condition:** The phase sequence of the incoming alternator (e.g., R-Y-B) must be identical to the phase sequence of the bus-bars.

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