Power quality in hospitals depends on more than keeping the supply available. Harmonics, voltage dips, transients, phase imbalances and frequency variations can expose transformers, UPS systems, motors, control systems and sensitive equipment to stresses that do not always cause an immediate outage.
This article explains how to distinguish each disturbance, which symptoms justify a measurement survey and where analysers should be installed to obtain meaningful data. It also sets out a method for correlating electrical records with load changes, alarms and clinical incidents, avoiding diagnoses based on a single reading. The aim is to turn power quality into a verifiable process: define the problem, measure it in context, locate its source and validate any corrective action under comparable operating conditions.