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Transformers Magazine Vol. 3 Issue 2
Dear Readers, In discussions that I have with people from all over the world on a daily basis, I’m frequently asked: How do you see the future transformer business? Is the market going to grow, or not? These questions are not only related to transformers, but also to materials, components, service, etc. People ask this knowing that I work with various teams and that I… 
Insulating liquids – Part I: Mineral oils 1. General Regulated power transformers are equipped with on-load tap-changers (OLTCs) or de-energized tap-changers (DETCs) to change their ratio and, subsequently, adapt the transformer output voltage to the respective conditions. This enables the power supply network to be kept stable under changing load conditions. In order to avoid overloading and optimally utilise all network components, regulated power transformers… 
The company overview Qualitrol was founded in East Rochester, New York, USA in 1945, starting as a supplier of instrumentation for transformers, predominantly mechanical pressure relief devices, thermometers, liquid level gauges, flow indicators, etc. In 1986, the company was acquired by Danaher and since then we have been operating independently, serving the power generation, transmission, distribution and industrial customers. Danaher is a group of diversified… 
Siemens Transformers: A global launch of the resilience concept Blackouts are the nightmare of today’s energy industry, no matter in which part of the world utilities operate: in a lot of regions and countries there is a history of famous blackouts – in both Asia and Europe, just as in North and South America. The reasons for such blackouts are manifold: old or faulty equipment,… 
Abstract With new threats endangering the safety of substations, critical infrastructure protection in substations has come to include sniper fire, ballistics and blast protection. Safe by Design approach allows that all types of design safety and performance criteria – fire, blast, impact, wind – cross over from safety to security. In this article Critical Infrastructure Protection innovations and strategy options are discussed, with a focus… 
Partner for quality assurance HIGHVOLT is known as a leading manufacturer of high-voltage test equipment. High-voltage test systems from Dresden have been used worldwide for routine, type, sample and other factory tests, ensuring the high quality and compliance demanded of produced transformers. Our representatives, and our sales and service teams work closely with the customers and are well familiar with their needs. The company has… 
Acquiring diagnostic insight into the condition of an asset through testing has several dimensions. Foremost, testing must be safe. Having diagnostic information should deliver positive net value when weighed against the cost of its acquisition. A test instrument must effectively overcome measuring complexities that are inherent byproducts of a live power system test environment and must consistently deliver representative results. Central to strengthening a test(s)’s… 
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… 
Company overview The company Dr. Dietrich Mueller was established in 1967 as a manufacturer of motor insulation. The company is located in Alhorn, near Bremen in the north of Germany. In nearly 50 years, the company has changed a lot, progressing from a small local company to a well-known player in the European and the World markets. We serve more than 15 industries today Having… 
Introduction Manufacturing transformer cores includes two critical steps - cutting the steel sheets to the correct shape and stacking them to form the core according to the design. Core cutting is a technologically sensitive process but since it is suitable for automation, it was already earlier automated. Core stacking, however, is a much more delicate process, particularly for larger transformers. It involves a lot of… 
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… 
CONNEX turns power transformers into compact all-rounders Network structures are changing dynamically while substations are becoming increasingly space-saving. These trends see power transformers and gas-insulated switchgear (GIS) face new challenges. They need to be quickly installable and replaceable, and support outdoor, indoor, offshore and variable use well into the future. Transformers can meet these exacting requirements with the universal, dry and pluggable CONNEX connection system… 
Detailed analysis of the test system features Abstract Distribution transformers are used worldwide and in very large quantities as a link between regional medium-voltage networks and local low-voltage distribution systems. To ensure quality, the required electrical characteristics must be demonstrated through extensive testing procedures on each distribution transformer in the production. This paper gives an overview of the equipment for automated testing of distribution transformers.… 
Advanced, most cost-effective 100 percent cellulose insulating paper qualified for up to 140°C Thermal Class in liquid-immersed transformers Abstract Insulation materials (paper, Transformerboard™) and components of modern power and distribution transformers are made of 100% cellulosic fibers. The cellulose materials are significantly more cost-effective compared to non-cellulose materials. WEIDMANN introduces its new advanced 100% cellulose insulating paper INSULutions® DPE that is developed for the layer… 
Abstract Skin depth and proximity effects in transformer windings are important phenomena influencing the design even at power frequencies (50-60 Hz). However, they become critically important at elevated frequencies, especially for high-frequency transformers, operating in switched-mode power supplies for example, at any power level. This article presents a numerical study of optimum winding configurations which can drastically reduce the proximity effects. It is possible to… 
REVOLUTIONISING TRANSFORMER RELIABILITY At a time when power generation has never been more critical to daily life, the challenges facing the world’s electricity network are mounting. For power generation, transmission and distribution companies, reliability has become the primary concern. Shell Lubricants believes the answer lies in gas-to-liquid (GTL) technology. The latest Shell Diala S4 transformer oils based on Shell GTL Technology are designed to help… 
Abstract Advanced air coolers are able to cool transformer oil more efficiently than older systems. Replacement or expansion of cooling plants by a new solution can lead to reduction of oil temperatures by several degrees and have a positive influence on the service lifetimes of oil and therefore transformers. Or, conversely, better coolers can – at the same oil temperatures – enhance the maximum performance… 
