Harmonics are periodic distortions of voltage, latest, or electrical power sine waves. Harmonics in ability distribution programs will often be attributable to non-linear loads like switched mode dc electrical power materials and adjustable speed motor drives.HLV ??c Th?ng kh?ng ??nh tham v?ng vô ??ch Cúp Qu?c gia và ch? ra ?T Vi?t Nam c?n m?t g