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)Harmonics are periodic distortions of voltage, present-day, or ability sine waves. Harmonics in ability distribution systems are frequently attributable to non-linear hundreds such as switched method dc ability supplies and adjustable pace motor drives.123B/124B/125B