Harmonics are periodic distortions of voltage, existing, or electrical power sine waves. Harmonics in ability distribution systems will often be a result of non-linear masses for example switched method dc power supplies and adjustable speed motor drives.C?p nh?t l?ch thi ??u bóng ?á hôm nay 27/7 v?i tâm ?i?m là nh?ng tr?n giao h?u qu?c t? có