Harmonics are periodic distortions of voltage, recent, or ability sine waves. Harmonics in power distribution systems tend to be caused by non-linear loads including switched mode dc electric power provides and adjustable pace motor drives. + B?n c?p nh?t th? công k?t qu? v? h? th?ng c?a mình: (nh?p n?i dung tr? tin nh?n sms, nh?p vào d? li?u ?