Harmonics are periodic distortions of voltage, existing, or electric power sine waves. Harmonics in electric power distribution programs tend to be a result of non-linear loads for example switched method dc power supplies and adjustable velocity motor drives.Ngoài ra, ng??i ch?i s? ???c h??ng ?ãi ng? t??ng t? nh? khách hàng VIP ? nh?ng n?i kh�