What instrument is used to parallel two machines in generator systems?

The synchroscope is the instrument utilized to parallel two machines in generator systems due to its ability to measure the exact phase difference between two alternating current (AC) sources. When connecting generators in parallel, it is crucial for both machines to be synchronized in terms of frequency and phase position. The synchroscope provides a visual indication of how closely the two sources are aligned, ensuring that they can safely be connected without causing disturbances in the electrical system.

When the pointer of the synchroscope is stationary and pointing to the 12 o’clock position, it indicates that both sources are in phase and at the same frequency, making it the appropriate time to close the circuit and connect the machines. If the pointer is moving, it shows that the phases are not synchronized, which would be risky for the system.

In contrast, a multimeter is used for measuring voltage, current, and resistance but does not provide information about phase alignment or frequency. An oscilloscope can visualize waveforms, useful for more detailed analysis of electrical signals, but it does not directly indicate the synchronism necessary for paralleled operation. An analyzer might assess certain electrical parameters but typically lacks the specific functionality to synchronize generators effectively like a synchroscope does.