Frequency Response Analysis Techniques and Their Applications in Electrical Power System: A Review

Frequency Response Analysis (FRA); Transformers; Rotating Machines; impulse Frequency Response Analysis (IFRA); Sweep Frequency Response Analysis (SFRA)

Authors

  • Ghode Ruturaj Ravindra ME Student, Electrical Engg. Department, FoTE, The Maharaja Sayajirao University, Vadodara, India
  • Umesh N. Soni Head of Section Diagnostic, Electrical Research and Development Association (ERDA), Vadodara, India
  • Dr. Anil S. Khopkar Asst. Director & Head of Division R&D, Electrical Research and Development Association (ERDA), Vadodara, India
  • Hiren M. Patel Assistant Professor, Electrical Engg. Department, FoTE, The Maharaja Sayajirao University, Vadodara, India
February 24, 2026
February 25, 2026

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Over the years, a number of methods have been developed to diagnose and monitor electrical and mechanical integrity of the power system equipment. Frequency response analysis (FRA) is one of the popular methods used for evaluating electrical as well as mechanical condition of power system components, especially for Power Transformers. This review presents a comprehensive and chronological overview of FRA applications in power systems. The evolution of methodologies from early offline methods to advance online approaches discussed in this article. This review aims to clarify current state of the FRA applications in power system.