What is the main purpose of a synchroscope in a power system?

A synchroscope is an essential instrument used in power systems primarily to synchronize generators before connecting them to the grid or to each other. Its main function is to indicate the relationship between the frequency and phase of the voltage waveforms generated by two separate sources. When two generators are operating at the same voltage, frequency, and phase angle, they can be connected safely without causing disturbances in the system.

The synchroscope displays this information visually, commonly with a rotating needle or digital reading. If the generators are synchronized correctly, they can be safely paralleled, allowing for smooth operation and balancing of the power supply. The ability to synchronize generators is crucial to maintaining stability and reliability within the power grid and ensuring efficient generation and distribution of electricity.

Other options, such as measuring voltage levels, monitoring load current, or tracking fuel levels, do not capture the essence of what a synchroscope is designed to accomplish, which is directly related to the synchronization of electrical power sources.