- Xem b?ch th? mi?n nam two s? cu?i c?a các gi?i ??c bi?t và gi?i 8 c?a các t?nh s?p m? th??ng.Harmonics are periodic distortions of voltage, present, or electrical power sine waves. Harmonics in ability distribution methods are often attributable to non-linear loads for example switched manner dc ability materials and adjustable speed motor dri