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Transformers Magazine Vol. 5 Issue 4
Dear Readers, Talking to my colleagues, I am quite frequently asked a question about the current situation in our industry, referring both to the market and technology. Transformers Magazine publishes the news that brings information about these topics, but people are also looking for potential conclusions that are based on all the available information. It is often possible to make inferences from the current information,… 
Innovations for distribution transformers MR is a company very well known on the market as the manufacturer of on-load tap-changers (OLTCs), mostly for power transformers. However, in the past the company had limited activities on the distribution transformer market. The fundamentals of the global business for distribution transformers within Reinhausen Group were laid down through the acquisitions of C.a.p.t. S.r.l. and CEDASPE Power S.r.l. in… 
Company overview Oxyweld is a leading Italian manufacturer of oxyhydrogen gas generators for brazing. With its Oweld brand marking its 37th anniversary and thanks to its experience and global presence, the company today supports many transformer producers and repairers in more than 70 countries. Oxyweld’s brazing technologies turn distilled water into gas and replace the conventional oxy-fuel cylinders (i.e. the most common oxy-acetylene, oxy-propane or… 
Who controls development Abstract Every country accepts a central control system for the national grid, but opinions have been divided as to who controls development of the grid. A benefit of a grid as a monopoly structure is that one organisation and government funding enables grid development for the national good – even if there is no immediate return on the investment. Keywords: national grid… 
Transformer fleets are getting older, energy networks are becoming more and more complex, and important know-how is being lost through demographic change. What can we do about it? The solution is to use intelligent equipment. Through ETOS® – the Embedded Transformer Operating System – Reinhausen is providing an open, modular system solution for monitoring, controlling, regulating, and digitalizing power transformers. It is the world‘s first… 
Hydrogen – the most measured and monitored transformer parameter Abstract Hydrogen gas has been the most measured transformer parameter in the last 30 years. At least 95 % of all online monitors used for continuous monitoring of transformers measure hydrogen. The majority of online monitoring performed on transformers measure only hydrogen, or the composition of gases as one figure relative to hydrogen. Subsequently, the data… 
Abstract Different test devices and methods are used in the market to verify the performance of current transformers during development, production, installation and maintenance. This article describes an innovative solution to test current transformers at all lifecycle stages by using a sophisticated testing method known as "model-based testing". Keywords: current transformer, testing, cost-efficient, CT lifecycle, model-based testing The typical lifetime of current transformers (CTs)… 
Big data Where is it and is it useful? Abstract A great deal has been made of big data and its potential usefulness in many applications in the electric power industry. It certainly is useful in many domains, such as banking and logistics, giving insights to previously ‘hidden’ data aspects that can and do escape the human eye. Data for assets in substations is… 
What is 360° customer-supplier approach L.A.E.'s 360° customer-supplier relationship is a long-term approach which focuses not only on making the sale today, but also on developing a relationship that will enable us to have a happy customer tomorrow. While simply selling some equipment, regardless of whether it meets the customer requirements, might create some turnover today, this is not the best investment in the future.… 
The diagnostic power of oil analysis for power transformers: New developments Abstract As blood tests provide information about a person’s state of health, oil analyses provide information about the condition of a transformer. Transformer oil testing has proven to be an excellent tool for early defect identification in preventive maintenance of oil-filled transformers. It has permitted extended service life by giving a measure of… 
Sea Marconi is an energy and environment-focused company, providing lifecycle management solutions for holders of electrical equipment filled with insulating fluids. On December 19, 2018, the company will celebrate its 50th anniversary, an extraordinary milestone achieved in keeping with the same inspiring principles laid down in 1968: to offer innovative and sustainable solutions. Headquartered in Turin, Italy, with five bases across Europe and South America,… 
Abstract This paper briefly introduces the world's first ±1,100 kV HVDC transmission project, focusing on the winding design of a converter transformer that was constructed for the project, based on the hot spot temperature rise. The winding temperature rise was first measured during the initial design of the transformer. Then the design of the oil channel was improved and the conductors arrangement was optimized. By… 
Abstract The transformer manufacturing process is complemented with a delicate task. Once the active part of the transformer has been assembled, the core and winding assembly is ready for dry-out. The efficiency and the effectiveness of the dry-out process are of utmost importance for the manufacturer and the end user. Throughout the life of the transformer, moisture in the solid insulation will accumulate as part… 
Abstract Increased renewable power generation, HVDC interconnections and geomagnetic effects all bias the AC grid with small direct currents which leads to two negative effects on transformers (theory of half-cycle saturation) increased noise and increased no-load losses. A unique solution is the DC compensation system, which is an add-on to a transformer which eliminates the DC effects. Furthermore, there are dedicated steps available, from pure… 
Abstract This article aims to draw attention of utility companies and their technical staff to the advantages of installing gas-insulated transformers in substations, and the main environmental benefits. The article also presents the most important characteristics and components of these transformers, as well as the maintenance cost savings that can be achieved by using gas-insulated transformers. Keywords: gas-insulated substation, sulphur hexafluoride, gas coolers, space saving… 
Abstract Instrument transformers for medium- and high-voltage applications play a key role in energy supply. Acting as the link between the primary network and the metering or protection equipment connected to the secondary side, a safe and reliable operation without failures is essential. In relation to this background, this paper discusses testing and diagnostic methods for instrument transformers. Different application examples are presented that help… 
