Harmonics are periodic distortions of voltage, present-day, or electric power sine waves. Harmonics in electric power distribution techniques are frequently a result of non-linear masses like switched method dc electricity provides and adjustable speed motor drives.Cu?i cùng tr??ng h?p vé c?a b?n cho bi?t khi dò k?t qu? x? s? trùng v?i nhi?u gi