Harmonics are periodic distortions of voltage, recent, or energy sine waves. Harmonics in electric power distribution methods are often attributable to non-linear hundreds which include switched mode dc energy supplies and adjustable speed 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 c