What parameters are measured in power quality analysis?

Power quality measurement includes: RMS voltage and current (fundamental and total), Power (real, reactive, apparent), Power factor (displacement and true), Frequency (nominal and deviations), Harmonics (individual and THD), Voltage sags/swells (magnitude and duration), Transients (high-frequency spikes), Flicker (voltage fluctuations), Unbalance (three-phase asymmetry), and Interruptions. Power quality analyzers sample at high rates (kHz to MHz) to capture harmonics and transients. Standards like IEEE 1159 and IEC 61000-4-30 define measurement methods. Data logging enables long-term monitoring.