Harmonics are periodic distortions of voltage, latest, or electric power sine waves. Harmonics in energy distribution programs will often be because of non-linear loads like switched mode dc electric power supplies and adjustable pace motor drives.Ca s? Tu?n H?ng b?t tay HLV Troussier và các tuy?n th? Vi?t Nam khi ?ang bi?u di?n t?i s? ki?n công