Transformers Magazine Vol. 2 Issue 3

Editorial Message

Dear readers,

I would like to thank all of you who have provided feedback on what we should improve about Transformers Magazine to be more informative and educative, and to make our services more  reader-friendly.

Thank you to all of you who commended us. I was quite surprised to hear that many of our readers find our services helpful in doing their daily business. This encourages us, but also obliges us to continue in this direction.

In this issue you will find several technical articles, three interviews, and a few advertorials.

We have modernized the interview format, making it more compact, and focusing on the matter relevant to a wider audience. This has made room to enrich the content by adding one more  interview.

Advertorials are technical articles which don’t undergo an editorial review. Therefore, they not only provide more freedom to communicate particular features of a product or service, but also enable better understanding of these features by a wider audience. We recommend them because they complement standard technical articles in educating the audience.

M. Ohlen, Director of Transformer Test Business at Megger, shares with us the actual Megger’s philosophy of transformer testing, and his view of the future of transformer testing.

B. Menzies, Commercial Director and Head of MIDEL Transformer Fluids at M&I Materials, gives an overview of how the company works with manufacturers and end users to deliver cost savings, asset performance improvements and risk mitigation.

K. Foell and H. Gieser, Managing Partners at Isotek – a German transformer insulation company – present their business model, which has enabled them to grow significantly, organically and by acquisitions, despite the challenging market conditions.

In his article, A.T. García provides a practical guide to transformer field tests from the perspective of predictive maintenance, describing the common off-line and on-line techniques, as well as other key points.

M. Krüger, U. Ranninger, and L.V. Badicu discuss the design and installation of a diagnostic and monitoring system on an old
transformer with high concentrations of hydrogen and methane.

D.M. Robalino presents a theoretical approach to measurements of Dielectric Frequency Response with examples of field measurements.

S. Coenen brings an overview of new trends in transformer monitoring systems, including HVDC and offshore applications, as well as the growing importance of continuous on-line monitoring of bushings, dissolved gases and new technology, such as partial discharge monitoring and the IEC 61850 standard in digital substations.

B. Klimpke and C. Su write about finite element modelling techniques, used to simulate three types of transformers. These simulations show a potential of finite element solutions as a useful and reliable tool to analyse transformers in detail.

In his article, J. Bernal brings forward a study of installing surge arresters close to a power transformer to provide protection against lightning overvoltage. He has analysed the voltage at base insulators of surge arresters and bushings for different cable lengths in a typical substation.

Have a pleasant reading.

Mladen Banovic, Editor-in-Chief

What’s behind transformer field testing?

Abstract To prevent unexpected outages it is necessary to implement a field test programme. It has to be decided what tests should be performed and what information is expected...

Individual temperature compensation

Abstract Dielectric testing techniques in the time and frequency domains are increasingly being used by transformer manufacturers, power utilities and researchers for transformer oil-paper insulation systems condition assessment. Since...

Naphthenic mineral electrical insulating oils

Abstract Much like the advice you receive about the correlation of the food you eat and your overall health, it’s all about what you put inside that optimizes the...

Trends in continuous on-line condition monitoring

Abstract The article describes new trends in the field of continuous on-line condition monitoring of transformers. These trends are related to the following topics: the monitoring system itself and...

KREMPEL´s POWERBOARD AK for power transformers

Vaihingen / Enz, Germany – With POWERBOARD AK the KREMPEL-GROUP provides a high-end electrical insulating material for use in oil-insulated power transformers. The product family has been approved by...