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Transformers Magazine Vol. 3 Issue 3
Dear Readers, In the Editorial message for the April issue, I wrote about a common interest in forecasting the market and industry trends, and pointed to grid investments of nearly USD750B in the first quarter of this year, which were all announced and covered in our breaking news, as one potential indicator of the future business. Since then we have published announcements on additional investments… 
Insulating liquids – Part II: Non-mineral insulating liquids 1. General In the previous edition of Transformers Magazine, the typical properties of mineral insulating oils were illustrated. In this issue, the column will discuss alternative insulating liquids and their potential for being used with tap-changers.Over the past 15 years, extensive research on various alternative liquids has been performed with the objective of qualifying selected tap-changer models… 
Introduction The Centre of Excellence (CoE) for Transformers in Zagreb was founded following the decision by the Management Board of KONČAR - Electrical Industry Inc. (pronounced Konchar) in 2005. Playing a vital role in this enterprise, KONČAR - Electrical Industry Inc. involved all transformer manufacturing companies from the KONČAR Group in the project, including KONČAR - Electrical Engineering Institute Inc., and KONČAR - Power Transformers… 
Abstract Electric utilities have a duty to supply electricity securely whilst being mindful of environmental needs and fire safety, especially in urban areas. Mineral oil in power transformers is the most critical conventional material used. Substituting mineral oil with bio-degradable and renewable liquid such as natural ester, provides a much higher level of safety and sustainability.This article presents monitoring results for the world’s largest natural… 
Introduction With the increasing globalisation of markets and manufacturers keen to explore the attractiveness of less familiar markets, there has never been a greater need for reliable and accurate data and market intelligence to assist in making important marketing decisions. The development of the internet has meant that there has never been more information readily and easily accessible, which has inevitably resulted in a variety… 
FEWA's profile Federal Electricity & Water Authority (FEWA) was established as an independent entity with an aim to run its own projects, be efficient and self-dependent, and improve people’s lives by dealing with the demands of the public. Established in 1999, FEWA's main objective is to cater to the needs of the population in the Northern areas. In pursuing this main goal, FEWA has had… 
As the modern world becomes increasingly “wired”, more critical systems and infrastructure are linked via the internet. While that has given rise to incredible new technology efficiency and capability, it has also meant that more countries are vulnerable to hacking and cyber attacks. In a recent briefing to the U.S. House Permanent Select Committee on Intelligence, NSA Director Navy Admiral Michael Rogers told the House… 
Abstract Vapor phase drying is the most effective method for drying transformer insulation in a manufacturing setting. The process does not lend itself well to transformer drying in the field for a variety of reasons, including the difficulty of removing residual kerosene which can cause a potential change in transformer oil flash point. Several techniques are available for transformer insulation drying in both the field… 
Introduction Transformer Life Management (TLM) Conference was first held ten years ago, following the idea to create a comprehensive platform where all industry stakeholders – transformer manufacturers, customers and service companies – could participate and have the opportunity to introduce their products and services. The idea was to have all people dealing with transformers and doing business in the transformers industry gathered together in one… 
In the transformers industry, Maschinenfabrik Reinhausen (MR) is a synonym for voltage regulation. Majority of transformers today operating around the globe are equipped with some kind of a tap-changer from MR. In the past, voltage regulation used to be required only at higher voltage levels in the transmission grid. However, nowadays, due to several reasons, voltage regulation is increasingly required in the distribution grid at… 
Abstract Grid expansion represents a technically obvious but also very expensive solution for the infeed of renewable energy sources. A more intelligent solution is the implementation of controllable distribution transformers whose ratio can be controlled under load, as well as voltage regulators used in the medium voltage grid. Keywords: voltage regulation, renewables, distribution grid, regulated distribution transformers Introduction Photovoltaics, biogas and wind turbines save resources… 
Abstract This article examines issues related to power quality and generation of higher harmonics in single-phase transformers of low power supply, supplying electricity to household, office and industrial equipment. A simulation of the generation of higher harmonics of these transformers was performed based on the results of the analysis of the magnetic field using the Finite Element Method (FEM). Harmonic composition of the current in… 
Abstract Superconducting transformers using high current density High Temperature Superconductor (HTS) wire cooled with liquid nitrogen can be lighter and more efficient than conventional power transformers. This paper describes the 1 MVA 11/0.415 kV HTS transformer developed by a New Zealand - Australian team, featuring HTS Roebel cable in the 1.4 kA-rated low voltage winding. Comparison of HTS and conventional transformer designs at 40 MVA… 
Abstract Infrared Thermography, Ultrasonic Noise Analysis, Partial Discharge Detection, Dissolved Gas Analysis, Vibration Analysis – all these techniques are great stand-alone diagnostic tools; however, when used properly, combining the data obtained through each technique, an incipient fault can be identified long before it degrades the insulation and creates a failure. This paper will provide guidance in setting up a complete Predictive Maintenance program to be… 
Abstract The dynamic resistance measurement was developed as a supplementary measurement in order to analyse the switching process of the on-load tap changer. The article considers the importance of on-load tap changers and their main testing methods with the focus on dynamic resistance measurement. Keywords: power transformer, on-load tap changer, OLTC, dynamic resistance measurement, DRM Introduction Power transformers represent the most expensive link between generation… 
