Exam Question
(a) (i) Describe with the aid of a sketch the operation of a synchroscope.
(ii) State the information obtained from it. (8)
(b) Suggest a substitute in the event of synchroscope and standby light failure. (8)
Class 4 (4th Engineer)
MET
📅 Aug 2023
Reference Answer
### (a) (i) Operation of a Synchroscope
A synchroscope is an instrument used to indicate the degree of synchronism between two AC systems, typically an incoming alternator and the main switchboard busbars, before they are paralleled. Its operation is based on the principle of a small, single-phase motor.
**1. Principle of Operation:**
The synchroscope compares the frequency and phase angle of the incoming alternator's voltage with the busbar voltage. It provides a visual indication of the frequency difference (as speed of rotation), the relative frequency (as direction of rotation), and the phase difference (as the angular position of the pointer).
A synchroscope is an instrument used to indicate the degree of synchronism between two AC systems, typically an incoming alternator and the main switchboard busbars, before they are paralleled. Its operation is based on the principle of a small, single-phase motor.
**1. Principle of Operation:**
The synchroscope compares the frequency and phase angle of the incoming alternator's voltage with the busbar voltage. It provides a visual indication of the frequency difference (as speed of rotation), the relative frequency (as direction of rotation), and the phase difference (as the angular position of the pointer).
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