Harmonics are periodic distortions of voltage, existing, or electricity sine waves. Harmonics in electricity distribution programs will often be because of non-linear masses for example switched mode dc power materials and adjustable speed 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)We even now beli