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Harmonics are periodic distortions of voltage, present-day, or power sine waves. Harmonics in ability distribution devices will often be because of non-linear loads such as switched mode dc electricity supplies and adjustable pace motor drives.Trường ĐH Thủy lợi lọt vào bảng tử thần, Trường ĐH Tôn Đức Thắng gặp khó Bó