Harmonics are periodic distortions of voltage, present, or electrical power sine waves. Harmonics in ability distribution systems are frequently due to non-linear loads including switched manner dc electricity provides and adjustable pace motor drives.Bundesliga là n?i quy t? nh?ng ??i bóng hàng ??u c?a n??c ??c. V?i s? c?nh tranh cao ?? gi?a c�