Correct option is D
· A synchroscope is an instrument primarily used to measure the phase angle difference between two AC power sources.
· It indicates whether the generators are in phase, which is crucial for synchronizing them to a common busbar. Additionally, by observing the movement of the synchroscope's pointer, operators can infer the frequency difference.
· If the pointer moves quickly, there is a significant frequency difference; if it moves slowly, the frequencies are nearly the same.
Frequency difference: While not its primary function, a synchroscope does give an indication of frequency difference based on the rate at which the pointer moves.
Phase angle difference: This is the primary function of the synchroscope, to measure and indicate the phase angle difference.
