Harmonics are periodic distortions of voltage, present-day, or ability sine waves. Harmonics in electric power distribution methods will often be caused by non-linear masses which include switched method dc electric power provides and adjustable speed motor drives.Th? thao B?c th?m t? k?t Cúp C1: Ch? ??i Siêu kinh ?i?n Các ??i th? h?i h?p tr??c