- June 2010
International Standard Serial Number (ISSN)
The transformer frequency response analysis test can be influenced in the low frequency range by the presence of core ferromagnetic remaining magnetization, avoiding a further and precise analysis of the
measured data. The first stage to avoid this effect is the magnetization
identification, what is mainly made comparing different FRA traces at
low frequency, where the core effects are visible and then the residual
must be removed to obtain an adequate measurement, applying DC voltage
following an experimental process explained in the article.