automatic translation ("food" = "Essen" - name of a german town)
"Stromnetze ohne elektrischen Widerstand"
Stream nets without electric opposition
The construction of an internal-urban pilot's distance for supraconductor cable begins. The supraconductor barely has electric opposition. So, he can transport as a 10,000-volt cable just as much stream, how a 110,000-volt-high-tension cable. This saves place and simplifies the Verteilnetze. A success of the pilot project can change the stream nets in areas of concentration.
Nearly no losses by the transference of stream promise supraconductor cable. This is possible because the cables barely have electric opposition at low temperatures from approximately below 200 °C. They can transport a lot of stream in compact construction method. An advantage for city centers in conurbations: Up to now here 110,000-volts Hochspannungsleitungen in connection with transformer stations provide for the fact that enough stream is ready in the Verteilnetze with 10,000 volts of tension to the care of the consumers. This costs place in expensive city center position.
Thus food a 6,500 km long Stromverteilnetz and 36 transformer arrangements provides in the Ruhr area town for the care of 570,000 inhabitants and companies. If the project "AmpaCity" is successful, transformer stations zurückgebaut could become. Surfaces would become free – not only in food. „ It goes of testing above all about how we can substitute terrifically for a lot of place and for volume demanding 110-kV arrangements in city centers with substantially more slender middle tension nets. On grounds of the high transferable achievement with low cable dimensions superconductive systems are predestined for this. In our project "AmpaCity" we want to prove that this also functions in the hard practise company to straighten our future net planning then if necessary accordingly “, Andreas Breuer, area leader says new technologies with RWE.
The longest supraconductor cable is built in the Ruhr area
In March, 2013 the construction of the pilot's distance begins. On a kilometer the supraconductor between the transformer stations Dellbrügge and Herkulesstrasse substitutes for a 110,000-volt-high-tension cable. The supraconductor cable can transport bigger stream amounts with smaller tension. Thus 110.000/10.000 volt transformers should become superfluous in future. In a study the Karlsruhe institute of technology determined in collaboration with cable manufacturer Nexans and the energy provider RWE that four of ten transformers could be cancelled in food.
The technology is based on a physical material quality: From a temperature from less than below 180 °C the supraconductor transports 100 times more stream than one copper cable. In spite of the necessary chill coat he can lead the 5-field Stream amount of a same-thick copper cable. By the lower place need become free in the thick supply network in conurbations of Capacities.
Part of the pilot project is also the investigation of security elements. „ The superconductive stream limiter prevents by a net disturbance, for example, to a short circuit or flash impact, boundless rising of the stream and thereby avoids cable defects. Compared with conventional protections he recovers again and goes again to function “, explains Wilfried Goldacker Bereichsleiter Supraleitende Materialien in the institute of technical physics (ITEP) of the Karlsruhe institute of technology (KIT).
Up to now the technology has not been tested yet in the big style. A test track more than 600 meters is nowadays in New York in company. The test track in food should deliver to 2016 knowledge to the practise suitability. „ The cable length is already very able of statement for production, installation and company and can be seen as a component for a whole city center ring, that is a city center ring is nearly one multiplier of this plan “, estimates golden field the informative capability of the results.
The study of the project partners examined before the construction specifies the technical and economic advantages of the superconduction in internal-urban nets. „ The results of the study show that as an economic alternative to the topical 110-kV-net structure the 10-kV net same to achievement with supraconductors can be shown. Besides, counts specifically to the city center area of food that on grounds of spatial restrictions an universal, on more conventionally 10-kV technology being based cable structure is not possible. This might count to other cities equally “, explains Breuer. For the use of supraconductors the study forecasts economic advantages under inclusion of the investment costs and operating expenses.
Breuer hopes for a signal effect by the project, because, indeed, " at the moment supraconductors are still no economic alternative to conventional cables. But in the long term looks and as a standard product they become – by assessment of the overall system as it also shows our study – is more economic than the today's technology. “ In addition the price-performance ratio of the leading materials must be improved. Also in the cable production and chill technology there is still optimization need.
Other links to the project "AmpaCity"
The project at cost 13.5 million euros "AmpaCity" is promoted by the Federal Ministry of economy and technology with 6.3 million euros. The other costs carry the project partners. Are involved energy provider RWE, which cable manufacturer Nexans, the Karlsruhe institute of technology and project bearer Jülich.
"Energy turn" of the Federal Ministry of economy and technology offers other details to "AmpaCity" and energy-political information to the news character.
The project info BINE (12/2011) „ Superconductive stream limiters in the power station “ delivers backgrounds to the technology. In the interview report professor Dr. Mathias Noe, leader of the institute of technical physics in the Karlsruhe institute of technology and Dr. Joachim Bock, manager about NSC, about the development of superconductive stream limiters.