Harmonics are periodic distortions of voltage, recent, or electrical power sine waves. Harmonics in electric power distribution units tend to be caused by non-linear masses such as switched method dc electrical power provides and adjustable speed motor drives.Ti?n v? Nguy?n Tu?n Anh phát tín hi?u tích c?c sau khi l? h?n ?T Vi?t Nam ? 2 tr?n g?p