METHOD OF AND APPARATUS FOR LEARNING THE PHASE ERROR OR TIMING DELAYS WITHIN A CURRENT TRANSDUCER AND POWER MEASUREMENT APPARATUS INCLUDING CURRENT TRANSDUCER ERROR CORRECTION

摘要

Current transducers are widely used in current measuring systems. They provide good isolation between the supply voltage and the measurement equipment. However they can introduce small phase errors which can become significant sources of error if the current to a load is out of phase with the supply voltage for the load. This disclosure discusses a robust measurement apparatus and method that can be used in situ to monitor for and correct phase errors.