Superconductivity: Costs to halve 2017

23.03.2012

Superconductivity: Costs to halve 2017

Current Technology: High-temperature superconductivity is a technology in the current economy just before the commercial launch. On the ZIEHL III conference in Bonn was also significantly, that the industry still has to deal with problems.

Für Mathias Noe, Director of the Institute of Technical Physics at the Karlsruhe Institute of Technology, There are four major areas of application of the so-called high-temperature superconductivity (HTSL): Cables and wires, rotating machines, Current limiters and transformers.

The increased use of renewable energies and the associated fluctuations in supplies to make an intelligent network expansion required. Again, the HTSC appliances increasingly into focus, I know Noah. A popular application for the issue of cable is the pilot line in Essen, where two substations around with a 1 km long 10 kV HTS cable are connected (see VDI news, 27. 1. 12, S. 12).

The new connection would be expected to: According to Frank Merschel, Coordinator at RWE of Germany for New Technologies, , a voltage, namely the 100-kV level, accounts, the urban footprint is smaller than the conventional supply and it takes less substations.

Many experts of the Bonn conference on "Innovation and the future of energy technology with high-temperature superconductors" (Ziehl III), the beginning of March was held, also forecast to decline in the cost of the so-called HTS 2. Generation.

Noe even predicts a halving of the cost per kA / m, measured at today's prices to 2017. The price in dollars will be in excess of 1000 $ pro kA / m anno 2006 to just over 50 $ per kA / m in 2017 be dropped.

"The price-to-current-carrying capacity of the ratio of copper to the HTSC 2. Generation will be in a few years below ", Noe said. If this is to take on expensive silver nickel, Chrome, Iron or yttrium-barium-copper oxide (YBCO) resorted.

But if a technology such as the HTSC is on the threshold for commercial use, it is still far away paced about. Not change even occasional use such as a superconducting current limiter in the actual operation of lignite power plant in Lausitz nothing Boxberg (see VDI news, 4. 6. 10, S. 11).

But there are always more ideas, Studies and demonstrators. So hat Vision Electric, a specialist in high-current rail systems from the Palatinate Schwanenmühle in Kaiserslautern, a conceptual study on the use of superconducting high-current rail systems presented. "One of the great advantages is the small amount of space in the often close factories", says Managing Director Wolfgang Reiser.

These rail systems are large transporter currents at rather low voltage, as in chlorine plants, for zinc electrolysis, or in aluminum smelters. Through testing has found Vision Electric, that up with HTS to 600 could be transported kA.

In aluminum smelters are currently up to 350 kA up to distances of 500 m transported. With HTS, the space it would be to 5 % reduce. Expensive protective equipment for employees could be omitted. "Actually, we have long been able to use HTS", Reiser says. A comparison of current losses, according to him shows clearly, that above 10 kA and at distances greater than 20 m is the HTS technology advantageous than conventional copper- or aluminum technology would.

Michael Baker, Founder of the German nanolayer of the Rhine river, pointed out in Bonn, that it was necessary to include the ecological balance in the HTSC Views. Although HTS only requires dramatically less material, It has a 100-times the power density.

If you were to build such generators for an 8-MW wind turbine market practice with copper technology, Sun would need 80 tonnes of copper - in HTSC, it would only 8 t. And again, the reference to the place: Measures of the rotor with copper 11 m, it is only in the HTSC 3,8 m. Disadvantage, however,: About 20 kg Rare earth würden gebraucht.

Probably the most promising applications of HTS current limiters to be: Here, she plays off her inherent advantages (s. Box). Since 2010 is the new Strombegrenzertyp in lignite power plant of Vattenfall in Saxony Boxberg in use. Meanwhile, he is loud Achim Hobl, Site Manager of Nexans technology supplier in Hurth, been further developed. "He is identical from the outside, but inwardly with respect to the material properties have been optimized. "

The application areas are increasing. Siemens has made the first tests with current limiters in power systems. Under the project financing of the U.S. Department of Energy, Siemens built Erlangen - under project manager, AMSC cable manufacturer - a demonstrator.

Task was the development of the Erlanger, the construction and testing of the switching modules. The current limiter encounter the stately proportions: about 5 m lang, completely filled with liquid and a switching module of three 21 bifilaren Spulen.

He was installed and tested at Southern California Edison substation in a. The high-voltage testing for insulation test he has passed all, so the lightning impulse, Switching impulse- and short time-frequency voltage test and partial discharge testing.

"This resistive current limiter is suitable for high voltage systems", says Wolfgang Schmidt, Magnetbauexperte von Siemens Corporate Technology. There's just one catch: This year was supposed to start the regular test operation. "But there is currently no money for this phase since, actually use the device ", says Schmidt. SCHMITZ ULRICH

Superconducting current limiter application

-When exceeding a critical current strength - such as when a short circuit or lightning - leaving the conductive material within milliseconds of the superconducting state and acts as a high electrical resistance. There is a defined leakage current flows, which can be adjusted accurately.

-Superconducting current limiters need after an incident does not control or spare parts, they are completely intrinsically safe. Be switched to the short circuit, the limiter only briefly de-energized, by the cooling so that he returns to operational readiness.
Those: VDI news, Bonn, 23. 3. 12, swe us

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