One method of determining harmonic problems on single-phase systems is to make two separate current checks. When this is performed, a ratio of average to true-RMS equal to 0.5 indicates _____ harmonic distortion.

Question

One method of determining harmonic problems on single-phase systems is to make two separate current checks. When this is performed, a ratio of average to true-RMS equal to 0.5 indicates _____ harmonic distortion.

Quizplus · Accepted Answer

A ratio of average to true-RMS equal to 0.5 indicates extreme harmonic distortion. This is because in a purely sinusoidal waveform (no distortion), the ratio of average to true-RMS current should be higher. A lower ratio, such as 0.5, suggests significant distortion from non-sinusoidal (harmonic) currents.

One Method of Determining Harmonic Problems on Single-Phase Systems Is