Current status and future trends in frequency-response analysis with a transformer in service Articles uri icon

publication date

  • April 2013

start page

  • 1024

end page

  • 1031


  • 2


  • 28

International Standard Serial Number (ISSN)

  • 0885-8977

Electronic International Standard Serial Number (EISSN)

  • 1937-4208


  • This paper presents the current status and future trends in the application of the frequency-response analysis (FRA) technique with the transformer in service (online) through bibliographic review and analysis. As a result, three basic stages of the online FRA test have been identified and defined: 1) injection and excitation signal measurement; 2) recording, filtering and processing of measured signals; and 3) curve analysis and interpretation. This work presents an overview of the online FRA technique, useful for subsequent research in this area.


  • frequency response; power transformer; remote monitoring; power transformers; transients