A challenging problem in the protection of power transformers is the fault detection and
diagnosis (FDD). FDD has an essential role in the reliability and safety of modern power …

Abstract Frequency Response Analysis (FRA) is an effective diagnostic technique for
detection of mechanical deformations inside a power transformer. The results of previous …

The sweep frequency response analysis (SFRA) is an analysis technique for detecting
winding displacement and deformation (among other mechanical and electrical failures) on …

This paper investigates the use of general bases with fixed poles for the purposes of robust
estimation. These bases, which generalise the common FIR, Laguerre and two-parameter …

Frequency response analysis (FRA) is a widely-used method to detect axial displacement
(AD) and radial deformation (RD) in windings of power transformers, because of its high …

This letter presents a novel and sensitive frequency response analysis (FRA) technique for
off/on-line condition monitoring of expensive power apparatus. The main objective is to …

This paper addresses the problem of estimating linear time invariant models from observed
frequency domain data. Here an emphasis is placed on deriving numerically robust and …

In this paper, model sets for linear-time-invariant continuous-time systems that are spanned
by fixed pole orthonormal bases are investigated. These bases generalize the well-known …

A recent frequency-domain, subspace-based algorithm is used in the identification of two
power transformers. The results indicate that the subspace-based identification algorithms …

This thesis addresses the problem of identifying the modal properties of a system based only
on measurements of the system responses. This situation is frequently encountered in …