Harmonics are periodic distortions of voltage, present, or energy sine waves. Harmonics in power distribution methods will often be a result of non-linear hundreds including switched manner dc energy provides and adjustable velocity motor drives.K?t qu? x? s? mi?n B?c trên m?ng c?ng s? ???c c?p nh?t ngay vào lúc 18h15 h?ng ngày b?i t?i các tr?