Harmonics are periodic distortions of voltage, current, or electricity sine waves. Harmonics in power distribution programs are frequently due to non-linear loads like switched mode dc power materials and adjustable pace motor drives.Th? thao HLV Troussier: Tuy?n Vi?t Nam không t? b?, quy?t ?òi n? Indonesia HLV Troussier kh?ng ??nh dù thua nh?ng