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Transformers Magazine Vol. 4 Issue 3
Dear Readers, In the previous issue of Transformers Magazine, my message highlighted how the information on the technology and market trends that the magazine brings can help companies to stay updated and increase their ability to respond promptly to ever-changing requirements and conditions in the industry. Following this, I had discussions with people at some industry events who showed more interest in this, and held… 
Tap-changer DGA: Uncovering an enigma Part 1: The field of DGA General Gases dissolved in insulating liquids are generated by thermal deterioration of the insulating liquid or they are introduced by contact with a gaseous environment (air, for example). Gases can also be formed by normal ageing processes of the liquid or catalytic interactions with metals or paints. The analysis of these dissolved gases… 
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… 
With twenty years of experience in power transformers maintenance, operations and condition monitoring, I have spent a long time in the specification area and in the oil condition monitoring sector. For the last four years I have been serving as the chairman of the Eskom's working group for operation and maintenance of transmission transformers. This group focuses on the issues around transformers, tap-changers, bushings, and… 
Transformer testing The core activities of our HV lab are research tests, and type and special testing of power transformers, mainly the transformers used in the distribution network. As an accredit lab, our service is very useful to transformer manufacturers who are present or wish to be present in the European market and need their products to be certified. Particularly interesting, we are also able… 
Power transformers – Market development to 2030 The global market for power transformers has continued to grow since the global crash in 2008, and furthermore shows good potential for the ten years at least. This sector of the market should be the most stable of the whole family of transformer markets, given that power stations are planned at least ten years ahead and major grid… 
Introduction Modern power transformers are equipped with numerous components, control, protection and monitoring sensors, systems and devices, etc. Signals for the control, protection and surveillance of transformer operation, as well as those used to assess transformer conditions are sent to different substation systems and specialized utility departments. Some of these devices are passive, not needing any power supply, but most of them do need power… 
About BEST BEST was established in 1966 and only a half a century later, the company has grown into one of the largest independent transformer manufacturers in Europe. The production of first transformers began in 1969, and ever since, we have steadily increased the production quality and capacity. Looking at our history, there were three phases in the development of the company. In the 1980s,… 
Company overwiev Oxyweld is a leading Italian manufacturer of oxyhydrogen gas generators for brazing. With its Oweld brand marking its 36th anniversary and thanks to its experience and global presence, the company today supports many transformer producers and repairers in more than 62 countries. Oxyweld’s brazing technologies turn distilled water into gas and replace the conventional oxy-fuel cylinders (i.e. the most common oxy-acetylene or oxy-propane).… 
Beyond the basics of condition monitoring Traditional approaches to asset management worked in traditional business environments, where time-based maintenance, fix on fail and redundant capacity were common, but times have changed. Power and utility teams now face a complex world with mounting pressure to keep assets in service and loaded to a high level, while simultaneously reducing the risk of failure. Changes in strategy and… 
The company LSIS (LS Industrial Systems) is a leading company in electric power systems/automations, smart grid solutions and photovoltaic systems since 1974. LSIS invests more than 5% of annual sales in R&D, which has led to achievements that earned the company the Green Technology Certificate in Korea. Furthermore, LSIS has been selected as one of the "World's top 100 global innovators" for the 6th consecutive… 
Avoiding grid disruption and transformer impact from geomagnetic disturbances When you think of disruptive weather, snow storms, thunder storms, lightning and high speed winds probably come to mind. Solar storms can also cause problems for the electric power grid and leave millions without power with limited advanced warning. These high impact, low frequency events do not happen often, but when they do, the consequences can… 
According to the Transformer Reliability Survey conducted by Cigre working group A2.37, 17 % of all transformer failures worldwide can be traced to defective bushings – and they are also one of the main causes of transformer fires and explosions. A particular problem associated with failures of high-voltage bushings is that, in a significant number of cases, such failures are catastrophic – a failed bushing explodes… 
Short-circuit withstand capability of power transformers – Part II Verification by full-power testing In short-circuit testing, the transformer is subjected to the actual short-circuit current. Tests are performed in every phase, each one to be subjected to the full asymmetrical current – one time at minimum tap position, one at nominal and one at maximum, during 0.25 s of current. In total, this is nine… 
Moisture – No. 1 enemy to a transformer As load demands on aging substation power transformers increase, damage control has become the key strategy for avoiding catastrophe. The loss of energy not only shuts down communities, but the costly replacement of equipment can become an economic burden. While engineers face multiple challenges, moisture is a persistent enemy to the life of a power transformer. Moisture… 
Power transformers switch AC voltage between different voltage levels, making them essential in power plants, industrial operations and electrical substations. To prevent damage due to overheating, fans are used in addition to oil cooling. Such fans need to be especially rugged since they are exposed to extreme weather conditions such as rain forest humidity, coastal salt spray, searing desert heat, or freezing arctic cold. ebm-papst… 
1. Introduction The key to a sustainable power grid rests on high voltage power transformers. Transformers used in the North American power networks are currently over 30 years of age on average, and many are approaching the end of designed service lives. In managing the power grids safe operation, partial discharge (PD) is considered a best indicator for the transformers’ residual lives. PD monitoring is… 
1. Introduction Severe damage may be caused to transformers when they are subjected to challenging transport conditions such as troubled sea during sea transportation, or a rough road during road transportation. Although it is known that transportation under these conditions will cause vibrations and small shocks in packages and equipment, it is also known that if packaging and fixing of the equipment are not suitably… 
1 Water in power transformers Water is the foundation for life on our planet. It is essential for every living plant or creature. But there is one place where water greatly reduces life: the oil-paper insulation of power transformers. This insulation consists of paper and pressboard elements which provide the mechanical stability of the insulation. The main component of paper and pressboard is cellulose. It… 
The structure and topography of the grid varies from country to country and so do transformer requirements. There are many factors impacting this including, but not limited to, the movements in load centres, changes in the number and type of generating facilities, the development of smart grid technology, changes in voltage levels and the need for increased efficiency and reduced transmission losses. The above said,… 
