Harmonics are periodic distortions of voltage, present, or electricity sine waves. Harmonics in ability distribution programs are often due to non-linear hundreds like switched method dc electric power materials and adjustable velocity motor drives..) b?n l?u ý l?i nh?p li?u. Trong ?i?u ki?n có th? MinhNgoc luôn Hello?n ho?c trong m?t kho?n th?i