Harmonics are periodic distortions of voltage, latest, or electrical power sine waves. Harmonics in electric power distribution devices in many cases are because of non-linear masses for example switched mode dc energy provides and adjustable speed motor drives.Ti?n ??o Ph?m Tu?n H?i c?n ít nh?t m?t tháng m?i h?i ph?c ch?n th??ng c? chân nên kh