Harmonics are periodic distortions of voltage, existing, or power sine waves. Harmonics in ability distribution units are frequently attributable to non-linear hundreds for instance switched manner dc ability materials and adjustable pace motor drives.(Nh?n ??nh, d? ?oán San Marino vs ?an M?ch) - ?an M?ch có c? h?i thu?n l?i ?? n?i dài m?ch th?n