Harmonics are periodic distortions of voltage, latest, or power sine waves. Harmonics in electricity distribution systems tend to be due to non-linear hundreds for example switched mode dc ability provides and adjustable velocity motor drives. + Các Web page, ?ng d?ng l?y d? li?u x? s? tr?c ti?p t? Minh Ng?c: K?t qu? c?p nh?t trên h? th?ng tr??c