Rational models must be passive in order to avoid unstable time domain simulations. This
paper introduces a fast approach for passivity enforcement of pole-residue models. This is …

For inductive components such as coils, inductors or transformers, litz wires with isolated
strands are used to decrease conduction losses in applications with higher operating …

Transformer design is a challenging engineering task, where the different physical fields
have to be harmonized together to fulfill the implied specifications. Due to the difficulty of this …

Power transformers can fail from dielectric stresses caused by electromagnetic transients. In
this paper, we focus on a special phenomenon where excessive overvoltages arise due to …

This paper investigates the performance of a recently proposed online transformer internal
fault detection technique and examines the impact of harmonics through detailed nonlinear …

The detection of failures within power transformers is considered an important issue since
these components are of critical importance for power system reliability; moreover, their …

Rational approximation of frequency-domain responses is commonly used in
electromagnetic transients programs for frequency-dependent modeling of transmission …

Transformers are the most important components of transmission and distribution systems.
For transformers the geometrical data is only available to the manufacturers and it is …

The paper discusses an improved modelling of transformer windings based on bacterial
swarming algorithm (BSA) and frequency response analysis (FRA). With the purpose to …

Sweep frequency-response analysis (SFRA) is a powerful technique to detect mechanical
damage in transformer windings, such as deformations and displacements, as well as other …