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Transformers Magazine Vol. 6 Issue 1
Dear Readers, One of the important practices of influential companies is that they always observe and consider technological and market trends, following current developments, forecasting future needs and requirements, and planning and preparing for the pending changes. The same is true for the companies in our industry. However, over the past few years we've been witnessing a trend where even middle-sized and some relatively small… 
Croatian TSO Croatian Transmission System Operator Ltd. (HOPS) is a company which is 100% owned by the Croatian Utility Company (HEP). With our owner being a vertically integrated company, HOPS is certified under the ITO model and manages independently its own business policies. The owners' rights are defined and transparent, with clear-cut business practices with HEP Group companies that are supervised by the Croatian Energy… 
An Interview with Megger’s Dr. Peter Werelius On September 27, 2018, IEEE-SA Standards Board approved IEEE C57.161-2018 – Guide for Dielectric Frequency Response test. This work follows that of other standards organizations, such as CIGRE’s TB 254, TB 414 and TB 445 – all technical brochures that address aspects of dielectric frequency response (DFR) testing. A Dielectric Frequency Response (DFR) test is an insulation health… 
Transformer components and sub-assembly markets The production of any power or distribution transformers requires the purchase and assembly of many components and materials, some of which are commodity items that are used in a variety of products, and some are tailor-made specifically for the transformer industry. Examples of the former include sheet steel, paint, aluminium and copper section, fixings, etc. and examples of the latter… 
Huaming in Turkey Huaming Turkey is a joint venture of Shanghai Huaming, a majority shareholder with 51% stake in the investment, and two Turkish investors holding the remainder 49% of the ownership. Both Turkish investors are very much involved in transformers business – one is a producer of insulation materials for transformers, and the other is engaged in the trade and supply of transformer components.… 
Used transformer oil (UTO) is a valuable resource because it can be processed to “as new” quality for re-use as insulating fluid. Customers in the electricity transmission and distribution markets as well as high-energy demanding industries can now take advantage of EOS transformer service offerings ranging from UTO collection to mobile and/or stationary transformer oil regeneration and maintenance. These services are available all over Europe… 
Tap-changer diagnostics: Present state and new developments Abstract The primary function of power transformers is to transform voltage levels for transmission and distribution. Often, transformers are equipped with a device to adjust the voltage ratio by changing the turns ratio: the tap-changer. About 30% of all European substation transformer failures are attributed to tap-changer failure, as well as about 22% of the failures in which… 
About Terna Terna is one of the main electricity transmission grid operators in Europe, which manages the Italian high-voltage transmission grid – one of the most modern and technologically advanced grids in Europe. Terna’s assets can be illustrated by the following figures: approximately 800 power transformers, 72,900 kilometres of high-voltage lines, 25 cross-border interconnection links with other countries, more than 30% of Italian electricity consumption… 
All you wanted to know about it, but were afraid to ask 1. Q&A about water in transformers The idea to write a Q&A column about water in transformers for this magazine came from various speaking and consulting engagements. Very often during seminars, workshops or technical presentations I have been asked to explain and elaborate on ‘seems to be trivial’, but ‘appeared to be’ complex… 
Abstract Many papers and reports show that the operating conditions of transformers in the grid are becoming more and more severe while the impacts and costs of loss of power supply are high and growing, forcing utilities to improve the requirements for transformers. This opens the space for innovations in transformers technology. The promise of main trends in transformers technology seems to be huge, and… 
Abstract This paper reviews currently available hardware and software for remote assistance during transformer maintenance and provides a newly created business model. Recently, a large number of wearables has entered the market, which could help support technicians in their maintenance work. This paper will focus on three of these wearables. Additionally, some software packages that are available offer a possibility to see what the technicians… 
Abstract The phase-shifting transformer is used to control the flow of active power in a complex transmission network, including the improvement of transmission capacity, reliability and operational safety of this network. It is an efficient and economical tool that helps increase the reliability and efficiency of power flow control in an overloaded transmission line in which it is installed. Therefore, information about its technical condition… 
Abstract This paper briefly discusses the functions of a power transformer’s insulating liquid in achieving effective cooling and reliable performance under high voltage stress, and in having sufficient oxidation stability to maintain performance, as well as low maintenance. Low viscosity over operating temperature range, high oxidation stability and favourable streamer propagation behaviour characterized by high acceleration voltage are key aspects of a good insulating liquid.… 
