Transformers Magazine Vol. 2 Issue 2

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Dear readers,

The new issue of Transformers Magazine is in front of you. Again a great deal of work has been done by our authors, technical and language editors, designers, people from marketing, and many others. I hope that the result of our work will be enough for you to find something interesting and that it will provide
a pleasurable reading experience.

Nevertheless, we know that we can do better. We want to do better and you are theones who know how we can achieve this.
Therefore, please continue to guide us withyour suggestions and constructive comments.

This time we bring you two interviews andseveral technical articles.

In the interview, Dr. Beatrix Natter, Headof Business Unit Transformers at Siemens, shares her views on the global transformr market and the position of Siemens technology and innovations for smart grid and eco efficiency applications.

In the second interview we bring you a summary of what Eng. Hassan Abdawani, Chief Executive Officer of Voltamp, said us about the strengths and value of his company and their position in the MENA market.

Both interviewees show how modern business leaders communicate with the market.

Simon Guicheteau provides fundamentals on different simulation possibilities using the Finite Element Method to design various aspects of a power transformer, from the electromagnetic to thermal and mechanical behaviour.

Pieter Jan Jordaens and his co-authors write about tests for transformers intended to operate under extreme environmental conditions, such as in remote wind turbine farms. The extreme cold environment puts stress on all wind turbine components, including transformers. Therefore, they put the transformer in a large climatic test chamber to validate its performance at extreme cold temperatures.

Dr Stan Zurek brings forward a description of rotational magnetisation as a phenomenon that occurs locally in the magnetic cores of three-limb transformers, focusing on introduction, definition and discussion of the phenomena of rotational magnetisation and losses in transformer cores.

Lance Lewand discusses the application of passivators and how they work in transformer systems. Presently, passivators are being used to control issues with corrosive sulfur, but they have also been used to control oxidation stability of the oil and static electrification. This paper focuses mainly on the use of passivators to control corrosive sulphur.

Dr. Bruce Pahlavanpour and Dr. Per Wiklund discuss results of their study of inhibited and uninhibited oils conducted on samples taken from transformers in service. They analysed samples for acidity, interfacial tension, dielectric loss factor and peroxide content. The inhibited samples were also analysed for inhibitor content.

Finally, Javier Jiménez Cervera and Begoña Remartínez Zato describe the development and validation of an analytical model based on ultraviolet-visible (UVVIS) absorption spectrophotometry for evaluating the content of 2-furfuraldehyde (2-FAL) dissolved in dielectric oil.

Have a pleasant reading.

Mladen Banovic, Editor-in-Chief

How to design power transformers efficiently?

Abstract Nowadays power transformers need to optimise their efficiency to ensure that a minimum amount of losses is generated by various physical phenomena. Finite element studies allow transformer designers...

Cold start of a 5.5 MVA offshore transformer

Abstract SLIM® transformers are compact liquid-immersed transformers according to IEC 60076-14 and customised for typical applications such as on- and off-shore wind turbines. State of the art SLIM® wind...

Communicate and grow!

Introduction The Transformers Magazine team often discusses with our customers and partners the changes that we are experiencing on the transformer market and those that we are yet to...

Rotational magnetisation

Abstract Rotational magnetisation is a phenomenon that occurs locally in the magnetic cores of three-limb transformers. The power loss dissipated under rotational magnetisation can be several times higher than...

Mineral insulating oils in service

Abstract There is precious little basic information openly available on how insulating materials in transformers behave over longer periods of time. However, such information is very important for ensuring...

Preparing vessels for dielectric fluid testing

Abstract Breakdown voltage testing is widely used to assess the condition of dielectric fluids used in transformers. The results obtained, however, are reliable only if strict procedures are followed...

New method for 2-furfuraldehyde analysis

Abstract Apart from abnormal faults detected by DGA, one of the most important factors in shortening the lifetime of a power transformer is ageing of paper insulation used in...