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Special Issue "Condition Monitoring and Reliability Assessment of Power Transformers"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A1: Electrical Power System".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 948

Special Issue Editors

Prof. Dr. Stefan Tenbohlen
E-Mail Website
Guest Editor
Institute of Energy Transmission and High Voltage Technology, University of Stuttgart, Stuttgart, Germany
Interests: high voltage technology; power transmission; electromagnetic compatibility; condition assessment; partial discharge measurement
Special Issues, Collections and Topics in MDPI journals
Dr. Arpan Kumar Pradhan
E-Mail Website
Guest Editor
Department of Electrical Engineering, Jadavpur University, Jadavpur 700032, India
Interests: high voltage transformer insulation; liquid dielectrics; cable insulation; overhead transmission line insulators; condition monitoring and diagnosis

Special Issue Information

Dear Colleagues,

Power transformers are one of the most important and critical components in power system networks. During its long service life, the transformer undergoes various stresses (electrical, mechanical, thermal, chemical etc.) which eventually degrade its dielectric as well as mechanical characteristics. The deterioration of transformer insulation characteristics reduces its dielectric strength, whereas winding deformation can result in internal faults. Gradual degradation of insulation characteristics and winding faults within the transformer during its service life can result in catastrophic failure and subsequently power interruption at the consumer’s end. The undesired interruption of power supply affects the production rate in heavy industries, which may result in huge monetary loss. In order to ensure a reliable power supply, the condition of transformers should be assessed regularly through employing advanced monitoring techniques. This Special Issue will cover the investigation of dielectric and mechanical characteristics of power transformers which are in service for a long period and are on the verge of ending their operating life. This Special Issue also invites contributions focused on the development of advanced techniques for monitoring the electrical characteristics and winding deformation of transformers for their reliability assessment to investigate further use in power system networks. Topics of interest for publication include but are not limited to:

  • Investigation on moisture profile and aging characteristics of power transformer insulation;
  • Diagnosis by chemical parameters;
  • Dielectric spectroscopy in the time and frequency domain;
  • Partial discharge diagnosis;
  • Investigation on winding faults within transformers;
  • Frequency response analysis of transformer windings;
  • Reliability assessment.

Prof. Dr. Stefan Tenbohlen
Dr. Arpan Kumar Pradhan
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • power transformer
  • transformer insulation
  • moisture
  • aging
  • partial discharge measurement
  • transformer winding deformation
  • condition monitoring techniques
  • reliability assessment

Published Papers (1 paper)

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Influence of Ester Liquids on Dielectric Strength of Cellulose Kraft Paper
Energies 2022, 15(3), 762; https://doi.org/10.3390/en15030762 - 20 Jan 2022
Viewed by 436
Generally, impregnation of solid insulation is performed to increase the dielectric strength and reduce the dielectric losses of solid insulants. This increase in dielectric strength depends on the oil’s diffusion and dielectric properties. This paper investigates the diffusion behavior of mineral oil and [...] Read more.
Generally, impregnation of solid insulation is performed to increase the dielectric strength and reduce the dielectric losses of solid insulants. This increase in dielectric strength depends on the oil’s diffusion and dielectric properties. This paper investigates the diffusion behavior of mineral oil and ester fluids (synthetic, natural, and mixed) to understand the influence of oil diffusion on paper breakdown voltage. To better understand this phenomenal influence, cellulose insulation paper of different thicknesses has been considered. Wetting characteristics of various oil-paper insulation systems were investigated with and without thermal stressing. Thermal aging was carried out as per modified ASTM D1934 at 110 °C, 140 °C, 160 °C, and 185 °C respectively for 2 weeks. The wetting characteristics and influence of different oils on paper breakdown voltage were explicitly reported. It is inferred that paper wetting characteristics are attributable to the type of oil, the thickness of paper, and the aging factor of oil-paper insulation. Importantly, the increase in paper dielectric strength and diffusion behavior for ester fluids is found to be superior to that of the mineral insulating oils. Full article
(This article belongs to the Special Issue Condition Monitoring and Reliability Assessment of Power Transformers)
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