Harmonics are periodic distortions of voltage, recent, or electric power sine waves. Harmonics in power distribution programs in many cases are due to non-linear masses for instance switched manner dc electricity supplies and adjustable velocity motor drives.Sau ?ó m?i l?a ch?n ra ??i bóng có ?u th? h?n ?? ??a ra d? ?oán c? th? chi ti?t v? k?t