Phasor Measurement Unit

Phasor is an electrical complex value containing of magnitude root mean square value and phase angle in polar form represents instantaneous electrical sinusoidal waveform. Phasor Measurement Unit (PMU) is a device that is used to collect and provide instantaneous phasors from desire places of applications, attached with an instantaneous time and date of measuring called time-stamped data. Estimated phasors sometimes are called synchrophasor, defined as a phasor that is estimated from samples using a standard time as the reference for a measurement, and has common phase relationship as remote sites, is a synchrophasor. Phasors are consumed by many applications to enhance power system stability and control, such as sequence impedance calculations for transmission lines and fault location for mixed lines. Moreover, using PMU readings from remote sites of a wide-area system, dynamic behavior of the system can be monitored. With this knowledge, when the system stability margin decreases, the monitoring software can detect such bad sign. Hence this operation is named Wide-Area Monitoring.