Harmonics are periodic distortions of voltage, latest, or energy sine waves. Harmonics in electrical power distribution methods are sometimes due to non-linear masses including switched manner dc ability supplies and adjustable pace 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)This product includes a