Different numerical indices have been proposed in different works to analyze the Frequency Response Analysis measurements, such as Standard Deviation, Spectrum Deviation, Absolute Sum of Logarithmic Error, and Correlation Coefficient. A comparative evaluation of absolute average difference (DABS) index on the same footing appears to have not yet been reported. In this paper, DABS is amongst the five numerical indices used in interpreting FRA that have been evaluated for their respective suitability, reliability and sensitivity based on the same test cases involving winding deformation of real life power transformers. It was found that DABS and ASLE are the most reliable and sensitive index for various transformer faulty conditions. On the other hand, CC is the least reliable index as it could not indicate faulty winding on most presented cases.
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