1. CIGRE Working Group A 2.26 Report: ‘Mechanical condition assessment of transformer winding using frequency response analysis (FRA)’, 2007
2. Standard-DL/T 911: ‘Frequency response analysis on winding deformation of power transformers’. The Electric Power Industry Standard of People's Republic of China, ICS27.100, F24, Document No. 15182, June 2005
3. Fault Diagnosis of a Power Transformer Using an Improved Frequency-Response Analysis