Harmonics are periodic distortions of voltage, recent, or energy sine waves. Harmonics in energy distribution systems will often be because of non-linear masses such as switched mode dc electrical power materials and adjustable velocity motor drives.Ti?n v? Nguy?n Tu?n Anh phát tín Hello?u tích c?c sau khi l? h?n ?T Vi?t Nam ? two tr?n g?p Indon