Harmonics are periodic distortions of voltage, recent, or electricity sine waves. Harmonics in energy distribution devices in many cases are caused by non-linear loads which include switched manner dc electricity supplies and adjustable velocity motor drives.Gi?i m?i (bao g?m t?t c? gi?i nào có s? thay ??i, c?p nh?t m?i ho?c ?i?u ch?nh)Just estab