Phasor measurement unit

Phasor measurement units are used to measure voltages and currents on the power grid. PMUs are synchronized with GPS or IEEE 1588 Precision Time Protocol. PMU measurement function is what these devices do.PMUs can report measurements with high temporal resolution, up to 120 measurements per second. The ability to record this data helps engineers in analyzing dynamic events in the grid. Permanently monitoring and control systems will be needed in future. A PMU can be a dedicated device or the PMU function can be incorporated into a protective relay. PM U is the only tool that can detect, quantify and control fluctuations in voltage or current. A Permanately Measureable Unit is also a method to measure voltage and current. It was created by Charles Proteus Steinmetz in 1893.