H?i ??ng XSKT khu v?c mi?n Nam yêu c?u ??i lý ph?i cho ng??i bán l? tr? l?i vé s? ?Harmonics are periodic distortions of voltage, latest, or power sine waves. Harmonics in energy distribution techniques in many cases are because of non-linear masses for example switched method dc electricity supplies and adjustable speed motor drives.H?i ??ng