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Transformers Magazine Vol. 6 Issue 4
Dear Readers, I believe you will all agree that the digitalization is a trend that has been dominant in our industry for the last two years. During that time, the so-called digital transformers which are designed for connectivity, digitalization and exchange of data and transformer parameters appeared on the market. Interestingly, Siemens called their digital transformer Sensformer, demonstrating the great trust in the concept. They… 
‘Coming back to Switzerland’ Haefely is a very well-known Swiss company for producing high voltage test equipment for manufacturers of transformers, instrument transformers, cables and switchgear. The company was founded by pioneer Emil Haefely in 1904. Haefely has been based in Basel in the intervening decades, where they employ more than a hundred people. Haefely also has employees in India and China to support their… 
Resilient solutions for electrical power supply Motivation Cities offer higher living standards than rural areas, which motivates people in areas of lower standards to move to urban areas, causing the rise of population there. This is urbanization process, and it is one of the most pronounced modern trends. In some areas the effect is so strong that it turns cities into megacities. Megacity is… 
PTTX supplies global market PTTX is a manufacturer of transformer cores with more than 200 employees that uses automated intelligence in its manufacturing process. From our smart factory we provide fully assembled cores, cut lamination (10 kV to 1100 kV) and related accessory products, as well as 30-1250 mm slit coils, on both domestic and international market. PTTX’s Headquarter is located in Wuxi City, Jiangsu… 
Transformer measurement policies for optimum asset management value Introduction Power transformers are crucial components in our systems for transmission and distribution of electrical power. They allow electrical power to be transported at any voltage level, thereby keeping losses limited and networks more stable. For the network manager, the health of the transformer fleet is, first of all, needed to ensure a reliable grid. Secondly,… 
Environment comes first with ABB’s oil-free transformers Oil-filled transformers are the predominate transformer technology in use today. Nonetheless, hazardous risks to humans and the environment still exist such as fire and spills. ABB continues to develop oil-free transformers to eliminate these potentially catastrophic events. Increasing environmental awareness and demand for electric energy coupled with modern urbanization trends have led ABB to develop innovative products for… 
Eco-friendly ester liquid transformer designs Ester liquids have been used in transformers for insulation and cooling purposes for over 20 years. These liquids greatly reduce environmental impact and significantly mitigate spillage and fire risks. Recent experience underlines the benefits of using ester liquids instead of traditional mineral oils. Since the 1990s, ester liquids have been gaining acceptance for transformer insulation and cooling with application… 
Driving down energy losses in transformers With some 5 percent of global electrical energy being consumed by transformer losses, energy efficiency has become one of the main drivers of transformer technology evolution and regulation. Energy demand and availability are intertwined with a nation’s economic growth and welfare. This symbiosis is reflected in many countries by the relentless escalation in energy requirements driven by thriving… 
ABB transformers for renewable applications Wind and solar are the fastest growing sources of electric power today for a few simple reasons: They are renewable energy sources that do not produce greenhouse gases or other emissions; the “fuel” is free and essentially infinite in supply; and as technology matures, equipment costs continue to drop. As one of the largest independent suppliers of electrical components,… 
How water affects transformer oil quality and helps monitor its aging As it is well known, transformer insulation consists of two major components – oil (liquid insulation) and cellulose based solid insulation (also colloquially known as “paper”). While insulating liquid could be of different types – such as mineral oil, natural and synthetic esters, the impact of moisture is universal. For that reason, we… 
Easy on-line partial discharge measurement and monitoring Effective in-service condition assessments Periodic on-line PD measurement and monitoring are considered the most reliable methods of evaluating the insulation condition of power transformers when in service. They are performed to investigate potential faults when, for example, the results from a Dissolved Gas Analysis (DGA) provide evidence of PD activity. They also verify insulation condition after necessary… 
A century of dissolved gas analysis - part II Introduction With time, the size of the transformer increased exponentially both in power and voltage. Although huge improvements have been made regarding the magnetic core and the decrease of core losses, a transformer is now producing much more heat due to the design optimisation and size reduction. Heat reduces the insulating properties of the insulating matrix,… 
Connection technology that pays for itself Pluggable connection technology versus fixed bushing Flexibility is the byword of our time, yet it poses big challenges for energy network operators. Power transformers are designed to operate for 40 years – a very long period, during which their environment or even their place of installation can change. But with pluggable connection technology, grid operators keep all future… 
Evidence-based asset management Those charged with managing assets in any electric, gas, or water utility face similar challenges when trying to meet their respective companies’ obligations to the owners, operators, regulators, and the public affected by these assets. In this column, the focus will be on both liquid-immersed distribution and power transformers - key components in any network. With the onset of DER (Distributed… 
Not all mineral oils are equal Abstract The life of a transformer is linked to the fundamental role of insulating liquids to dissipate heat and protect the transformer’s solid insulation. Historical developments affecting crude oil source and advances in refining technology mean that not all mineral insulating oils are made equal. Isoparaffinic oils in particular can offer enhanced oxidative stability, lower viscosity in colder temperatures,… 
Retrofitting of 245 kV OIP bushing with longer oil-end Abstract This article focuses on an original case history of replacement of a leaky 245 kV OIP bushing of a 220/132/33 kV, 160 MVA, transformer on site at the 220 kV Jabalpur substation, in Madhya Pradesh state in India with an available 245 kV OIP bushing having longer L-2. To retrofit the same turret adopter, an… 
Optimization of transformers efficiency Abstract Following the first article published in July concerning the optimisation of total cost using the PEI for large power transformers, this article is related to optimization of the total cost of medium power transformers use after they have had their losses fixed by the regulation. Keywords: eco-design, efficiency, losses, CO₂ emission, total owner cost, PEI Introduction The targets… 
