Transformers Magazine Vol. 1 Issue 2
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Editorial Message
Dear Readers,
In this issue, the Transformers Magazine brings you a wide range of technical articles – from general overviews to advanced specialised articles, and two columns.
Jean Sanchez presents an overview of six most commonly used power transformer winding types: continuous disc windings, interleaved windings, intershielded windings, layer windings, helical windings, and pancake windings.
Dielectric and thermal design considerations for the use of esters as insulating and cooling fluid are presented in the article by Mark Lashbrook. Three case studies are described, including the details which caused decisions to be made about the usage of alternative fluids, for example, greater demand for fire safety, the increased need for protection of the environment from pollution and avoiding fire extinguishing system.
In his column Trends in Power Transformer Failure Analysis, Wallace Binder writes about different failure modes in transformers and methods for detection of these failures.
Ester Fluids for Power Transformers at >100kV
Introduction The behaviour of mineral oil is well understood and designers have established rules for the construction of transformers through research, as well as trial and error, over many...
Trends in Power Transformer Failure Analysis
The transformer failure can be initiated by many factors, but the results of a failure can be the same. Diagnostic tests provide indication of incipient failure. One must have...
Transformers in HVDC Transmission
Why do we need power transmission by direct current? The transmission of bulk electricity in the last 120 years has revolutionised the way we live and work by bringing...
Power transformer Life Part 2: Ageing Mechanisms
What is insulation made of? By now you have probably noticed that I have referred to the insulation material as “cellulosic”. At this point I must make a clear...
Thermal Designing and Building Transformers for Use with Viscous Fluids
Introduction and history Before the 1970s, transformers that needed to be fire resistant used dielectric fluids that contained chlorinated chemicals. These fluids were generally called PCB (Poly Chlorinated Biphenyl)...
What Influence Does Residual Magnetism Have on the Transformer Core?
Introduction Power transformers are key elements in the electrical grid. If a power transformer fails, the financial impact of the outage time is in most cases considerably larger than...
Interview with Mr David Zabetakis, President of Doble Engineering
Transformers Magazine speaks to Mr David Zabetakis, President of Doble Engineering Company with over 25 years of executive leadership experience in the utility industry, including Aclara Software, CURRENT group...
