These latest steps confirm Hydro's good reputation for excellence in quality and expertise, with a stable metal supply and a strong service thanks to excellent delivery reliability and technical expertise. Hydro has been active in the transformer business for 30 years, holds the top position in the market and is valued as the most experienced partner for all major transformer manufacturers in Europe. Hydro is steadily expanding deliveries to overseas manufacturers, particularly to the Middle East, South America and Australia.The top product is HYDEC, a variant of alloy 1070, which uses transformer applications due to its particularly high electrical conductivity - which makes the switch to aluminum as the best material for transformer coils even more obvious. In general, aluminum is lighter and cheaper than copper. In the annealed condition, transformer coils made of HYDEC tape from Hydro ensure a conductivity value of more than 62.7% IACS, their typical value is even 63%.
At the world trade fair CWIEME 2014 in Berlin, where the transformer industry meets from June 24th to 26th, Hydro explains to its customers how the one-week delivery time can be achieved and how the company can help make aluminum the most efficient Solutions to come.
More reliable products thanks to new burr measurement
Hydro has also improved the reliability of its transformer material when it is cut to width. For this purpose, the topography of the cut edges is measured with a new type of electronic device - compared to the previously only manual measurement using a micrometer. Transformer manufacturers insulate the soft, narrow tape in their coils with thin layers of paper, whereby high, sharp edge burrs can penetrate the insulation layer and cause short circuits in the finished transformer. Hydro's electronic burr measurement provides more accurate data, making it easier for customers to build more reliable transformers.
"We strive to make our beautiful, infinite metal the material of choice for transformers and other applications for electricity, energy and other engineering," said Wolfgang Rempe, head of the General Engineering Hydro business unit. "The fact that we are strengthening our service for the transformer industry is part of our strategy to further expand our position in particularly demanding products that are individually optimized for the needs of our customers."
Hydro manufactures aluminum strip for transformer coils in its Karmøy rolling mill in Norway, where it is cast directly from liquid material. In this process of continuous strip casting, Karmøy belongs to the world leaders in technology. Compared to hot-rolled strip, the cast strip impresses with improved properties in terms of its strength, temperature stability and electrical conductivity.
In addition, the metal can be recycled after each use, while maintaining its quality and thus proving to be an infinite metal for responsible, efficient use of resources.
The aluminum band of the Hydro has an even surface that is free of scratches or impurities. "We can supply transformer tapes in six different states and thus ensure the appropriate values for yield strengths and tensile strength, elasticity and hardness for the desired solution," says sales manager Kristian Midbøe from the Hydro plant in Karmøy. Thicknesses vary between 0.3 to 2.5 mm, widths from 25 to 1,500 mm. Intermediate layers and cores made of paper in different diameters are optional.
The Karmøy rolling mill is certified according to the ISO 9001 and ISO 14001 standards.