Harmonics are periodic distortions of voltage, current, or energy sine waves. Harmonics in electric power distribution programs are frequently due to non-linear hundreds such as switched mode dc power 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 không th? tham gia