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Effect of Electric Field Uniformity on Breakdown Mechanisms of Dielectric Liquids under Lightning Impulse

July 25, 2022 - by University of Exeter - Leave a Comment

The electric field uniformity imposes a significant effect on the breakdown mechanisms of dielectric liquids. In general, breakdown is dominated by streamer initiation under uniform field, while it is dominated …

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A Reduced Radiator Model for Simplification of ONAN Transformer CFD Simulation

July 25, 2022 - by University of Exeter - Leave a Comment

In this paper, a reduced computational fluid dynamics (CFD) model is proposed for determining the total heat dissipation and the oil temperature distribution of transformer radiators in oil natural air …

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Using Lumped Element Equivalent Network Model to Derive Analytical Equations for Interpretation of Transformer Frequency Responses

June 25, 2022July 25, 2022 - by University of Exeter - Leave a Comment

Frequency Response Analysis (FRA) is regarded as the most effective technique for detecting mechanical faults in transformer windings. However, the main challenge in applying the FRA technique lies in the …

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Influence of Paper Ageing on Transformer Failure

February 9, 2020February 9, 2020 - by University of Exeter - Leave a Comment

Ageing of paper insulation is a key parameter which determines the end of life for transformers. Much research has been conducted in trying to establish where the end of life …

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Analysing the Power Transformer Temperature Limitation for Avoidance of Bubble Formation

February 9, 2020February 10, 2020 - by University of Exeter - Leave a Comment

Introduction Power transformer insulation serves a vital purpose of providing dielectric protection to the transformer. Solid insulation is wrapped around the winding conductors, usually in thin layers. During service, winding …

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Effect of Oil Regeneration on Improving Paper Conditions in a Distribution Transformer

September 19, 2019September 20, 2019 - by University of Exeter - Leave a Comment

  Managing a large fleet of ageing assets has become a technical challenge faced by many electricity utilities in developed countries. Asset managers are increasingly interested in techniques that can …

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Classification of Transformer Windings Types Using Frequency Response Analysis by Machine Learning Method

June 22, 2019June 22, 2019 - by University of Exeter - Leave a Comment

A considerable amount of power transformers in operation do not own Original Equipment Manufacturer (OEM) technical support. It is desirable and feasible to obtain the related design information by interpreting …

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Transformer Related Post Graduate Research Training at the University of Queensland (UQ)

June 22, 2019June 22, 2019 - by The University of Queensland - Leave a Comment

At the University of Queensland we have always focused on higher degree research training. In the recent past, a number of our students have graduated with their PhDs and MPhils …

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Interpreting First Anti-Resonance of FRA Responses through Low Frequency Transformer Modelling

June 22, 2019June 22, 2019 - by University of Exeter - Leave a Comment

Introduction The failure of transformers can result in safety issues and economic losses. Although FRA is widely used to detect mechanical winding deformation, the success of this technique lies in …

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Magic to visualise the invisible: a comparison on the optical methods to visualise streamers in insulating liquids

June 19, 2019June 22, 2019 - by University of Exeter - Leave a Comment

The prebreakdown and breakdown phenomenon in liquids is termed as ‘Streamer’. To better understand the mechanism of liquid breakdown, we need to have deep insights into the streamer process, which …

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News

  • Questionnaire from CIGRE Working Group A2.62 (Analysis of AC Transformer Reliability)
    September 2, 2020
  • UTRA Webinar on Transformer Life Extension through Oil Regeneration Conducted by The University of Manchester
    May 5, 2020
  • “Energies” special issue “Condition Monitoring and Reliability Assessment of Power Transformers” with Professor Stefan Tenbohlen as the guest editor
    March 31, 2020

Recent Technical Posts

  • Effect of Electric Field Uniformity on Breakdown Mechanisms of Dielectric Liquids under Lightning Impulse
  • A Reduced Radiator Model for Simplification of ONAN Transformer CFD Simulation
  • Using Lumped Element Equivalent Network Model to Derive Analytical Equations for Interpretation of Transformer Frequency Responses

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