Chào Anh Picvendor, Nhờ Anh giúp bài này, Không có link DOI
1) IEEE Recommended Practice for Establishing Liquid-Filled and Dry-Type Power and Distribution Transformer Capability When Supplying Nonsinusoidal Load Currents - Redline
http://ieeexplore.ieee.org/xpl/mostR...number=5985450
Cám ơn Anh.