ARWtr2022 Publication

ARWtr2022 is technically co-sponsored by IEEE.

All accepted and presented papers in Poster Sessions will be collected and submitted to IEEE Xplore Digital Library, Scopus and Web of Science databases.

The accepted Final Full Papers

Poster Session 1


The current study presents cooling curve analysis (CCA) as a source of winding and oil thermal parameters resulting from HRT and the correlation between electrical and thermal designs. Moreover, a novel algorithm based on CCA is introduced to describe temperature distribution along the winding and oil, including the top oil per winding and the winding hot spots, which is compared with study cases equipped with fibre optic sensors (FOS). The algorithm offers by this an additional indicator of the hotspot temperature, where it could be a challenge to use fibre optic sensors.


The current study presents a newly developed model for calculating the mode shapes and corresponding eigenfrequencies of the power transformer’s tank. The model accounts for the tank geometry and the effect of the radiator and shields connected to the tank. For the latter, FEM simulations were conducted to investigate the effect of shields and the radiator in shifting the eigenfrequencies of the bare tank to drive correction factors for the model. sensors.


The paper presents the comparison of 2D and 3D finite elements models of 500 MVA Phase Shifting Transformer showing when they are almost equivalent to each other and also when the simplifications introduced by the 2D approach are too big.


This paper aims to use the black-box approach to model the winding internally. For this use a special transformer winding model with 47 internal terminals and two external terminals (winding ends) is constructed. Mathematical model that can accurately model overvoltages on internal winding segments is created using a novel method.


This paper discusses the impact of the use of dry lubricating compound during the manufacturing of a power transformer on the dielectric properties of the solid and liquid insulation. Change in dielectric properties noticed in specific cases are discussed.


Calculation of turn-to-turn capacitance in power transformer winding is considered in the paper. Simple analytical expressions for the capacitance of plate and cylindrical capacitors are used. These analytical expressions are improved by adding numerically obtained correction factors. These factors are obtained by analyzing the results of electrostatic 2D FEM calculations of partial winding geometry.


The current study presents a core resonance model constructed with low computing time and an acceptable accuracy. The model was set up to calculate the eigenmodes and -frequencies of the core. The accuracy of the developed model was validated against the FEM, using ANSYS on a reference core model.

PAPER 1.8.

In this paper we investigate the ability of the method based on the evaluation of the current and power unbalances to detect a remote open phase fault in the transmission line that feeds the start-up transformers (SUTs) of an nuclear power generating stations (NPGSs).


In this work, a test platform from a 100MVA transformer is proposed to study the thermo-hydraulic behavior of the real electrical machine. This study has evaluated different models to analyze accurately the thermal-hydraulic behavior of the power transformer. Analyses have been carried out with different fluids observing if synthetic ester is a preferable alternative to mineral oil using the traditional liquid to validate the model.

PAPER 1.10

This paper presents the investigation results of a study on how dielectric barriers between low and high voltage windings influence the winding temperature rises of dry type transformers. Dedicated heat run tests have been performed for two transformer designs that have been assembled with 0, 1, 2 and 3 cylindrical barriers in the space between LV and HV windings.

PAPER 1.11

This paper presents the results of a computer simulation analysis combining the application of energy spectral density techniques and evaluation of the rate of rise for checking the voltage withstand of the dielectric system of a current transformer under the incidence of a set of fast transient voltage surges caused by switching operations of an adjacent disconnector..

Poster Session 2


This paper presents a summary of research undertaken on solids insulation with ester liquids and the potential benefits to transformer design and operation.


The scope of this work includes a feasible technical solution to correlate and validate LF DF values with narrowband and wide spectrum dielectric frequency response. This approach avoids the decision dilemma that many asset managers, transformer testing specialists, and the industry, in general, have been facing.


In this paper the bio-based hydrocarbon in question will be described and compared to other common insulating liquid. Aspects of biodegradability and carbon footprint will be briefly touched. Existing case study transformers are briefly presented and some DGA data given for one of the in-service units. A thermal simulation scenario based on actual heat run data on a synthetic ester and bio-based hydrocarbon filled unit will be presented.


This paper presents a novel systematic parameter-selection process to improve transformer top-oil temperature estimation, reducing the prediction error by half, as confirmed with the results. The proposed approach has the potential to deliver better health management of transformers through an intelligent feature selection process.


In this paper, the influence of flexibility of the spacers on the critical stress of the winding has been investigated. The investigation has been done, through case studies, to analyze the influence of the flexibility of the spacers on the critical stress of the inner winding.


This article presents the methods and results of an experimental study performed to investigate the partial discharge behavior of synthetic ester and gas-to-liquid insulation liquids using a transformer design-based creepage discharge test setup similar to a two-layer winding with barrier insulation.


This paper goes on to describe gas generation in windfarm transformers. This is virtually independent of the type of transformer And the type of fluid contained in the transformer. The causes of this anomalous gas formation are not fully understood yet, although some possibilities have been proposed.These causes are discussed in the paper.


This paper describes a new, voltage and impedance flexible design of transformer, which can better match characteristics of existing, to be replaced transformers, and which can actually be applied as a permanent replacement.


This paper aims at showing how the concept of hybrid twin [4], applied to the maintenance management of the (Réseau de Transport d’Électricité) RTE’s fleet of power transformers, can offer the best way to response the aforementioned challenges.

PAPER 2.10

This work presents, to the authors’ knowledge for the first time, direct measurements of the clamping pressure, with novel fibre-optic pressure sensors placed directly on top of the windings on an in-service transformer. Real-time measurements are useful when combined with a physical understanding of the system and good models.

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