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Transformers Magazine Vol. 5 Issue 1
Dear Readers, 2017 was a very dynamic year, both in terms of technology and business. If we talk about technological advancements, a development that stands out is definitely the news about successful testing of the 1,100 kV DC converter transformers at Siemens and ABB. Both transformers were developed and manufactured for the sending and receiving stations of the Changji-Guquan UHVDC link in China, which will… 
About RTE RTE (Réseau de Transport d'Electricité) is a French system operator with about 8,500 employees and a revenue of around 4 billion euro. Since we are still investing a lot in our grid, our annual investments come at 1.5 billion euro. One of the factors driving these large investments is the development of renewables, which is on a sharp rise in France, so we… 
Tap-Changer DGA – Uncovering an Enigma Part 3: Interpretation Abstract Gas generation in OLTCs is influenced by operational and design parameters. There are multiple gas generating components present depending on the specific OLTC model or class resulting in a superimposed gas pattern thus making its interpretation for the purpose of fault detection more difficult. In many cases, suspicious behaviour can be revealed, and in… 
Abstract Outage planning is a critical consideration companies cannot spare to neglect. Identifying which assets need attention and by taking preventative measures to monitor the condition of your key assets, teams can proactively plan for maintenance work and have insights into critical problem areas before they cause system failure. This article will review partial discharge/electromagnetic interference in-service surveys, how to identify risks to your assets… 
Abstract The properties of MIDEL natural and synthetic ester transformer fluids are fire safety, environmental protection and transformer performance improvement. The market’s response to the MIDEL brand proposition has been overwhelmingly positive. Using MIDEL can help achieve major installation and ownership cost savings by enabling a smaller substation footprint, reducing or eliminating the need for additional fire suppression systems, and reducing the need for containment… 
KSH Group KSH International is a manufacturing company with 38 years of experience, belonging to the KSH Group. The company is the largest shaped magnet wire and continuously transposed conductor (CTC) manufacturer in India. By shaped, I mean that we do not do any round magnet wire, but are specialized in shaped magnet wire, which is mainly used for transformers, motors and some special applications… 
Soft market issues Abstract The growths and declines of transformer market through the decades have been driven by grid expansions, global economic crises and in recent years by emerging distributed generation, energy efficiency initiatives, and sophisticated control through smart grid and FACT systems. Every aspect of transformer design and use has evolved and will continue to evolve over the coming decades. Due to price… 
The business environment around us is changing very fast, at a pace which until a few years ago was impossible to imagine. The digital ‘tsunami’, if I may use this word, has a potential to dismantle years of established business models, which, to some extent, is already happening. I love to ask my senior executive peers from the power industry (ones with the domain expertise)… 
Abstract Global market for power transformers above 100 kV reached $18 billion in 2016. APAC region has the largest demand for power transformers, with China, India and Indonesia leading the market. Following APAC is the Americas market, with USA leading in terms of the market size owing to grid replacements and renewable integration. In EMEA, strong growth is driven by GCC countries and Sub-Saharan Africa… 
Precautionary measures for Industry 4.0 Abstract Manufacturing today is no longer simply about making physical products, but about finding new ways to create and capture value for the end user. Changes occurring on multiple fronts – customer demands, the economics of production and the economics of the value chain – have led to major shifts in the way products are designed, produced and sold.… 
Operation of transformers: Impact of harmonic loading on transformer losses Abstract Due to the increasing number of electronic devices with non-sinusoidal power supplies applied in today’s grids, transformers are being subjected to enhanced internal heating. Also, additional heating of transformer coils is caused by current waveform distortions due to non-linear loads, which in turn induce additional harmonic components to the fundamental (power frequency) current. The… 
Abstract The transformer life and performance strongly depend on winding hot-spot temperature (HST). Various alternative techniques for HST prediction are gaining popularity over the conventional direct-measurement methods. In this context, the application of Computational Fluid Dynamics (CFD) based thermal models is particularly interesting because of their accurate assessment, higher precision and low cost. Besides, it can remarkably evaluate and improve the design efficiency of transformer… 
Abstract A team of OMICRON test engineers was assigned to perform a comprehensive condition assessment of a 300 MVA power transformer. The power transformer was intended for sale and, therefore, the operator and the potential customer wanted to receive a clear insight into the current condition of the different transformer components. The expectations were clear: All required tests had to be performed within one day… 
AbstractTransmission networks of different high voltage levels are usually connected by autotransformers. These autotransformers are generally continuous flux types regulated from the HV or LV side. Some cases also require controlling the power flow between these networks. One such case is in Ghana, where the existing 161 kV transmission network is expanded by new 330 kV lines. A cost effective and dependable solution selected by… 
Tamini power transformer success story AbstractPower flow within networks is becoming increasingly complex with high probability of unforeseen peak demands throughout the day. The use of thermally upgraded kraft (TUK) paper and FR3™ natural ester allowed TAMINI to successfully design, manufacture and test an autotransformer with increased load capacity (375 MVA vs 250 MVA nominal rating) for Italian system operator TERNA. With this solution the… 
Abstract This article discusses a special test on transformer bushings which has been introduced in the technical specifications of the Italian Transmission Operator. This test is used to increase the safety in case of an internal electric arc fault in a bushing, which might explode posing threat to human life and the surrounding equipment. Keywords: internal arc, withstand, short circuit, turret, bushing 1. Introduction Safety… 
