Category Archives: Energy Monitoring

A current transformer, or CT, is the component that lets you measure a large alternating current safely, by scaling it down to a small, standardised value an instrument can read. CTs sit behind almost every power quality analyser, energy meter and protection relay. This guide explains what they do, how they work, the main types, and the one safety rule you must never break. What a current transformer does Measuring hundreds or thousands of amps directly is neither safe nor practical. A current transformer solves this by producing a secondary current that is an accurate, scaled-down copy of the current … Continue reading →