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To date, copper and aluminium cables carry the current into the city centres. Large substations lower the voltage to 10,000 volts and feed electricity into the distribution network. With compact high-temperature superconducting cables, this structure can be simplified. The BINE Projektinfo brochure "Superconductors for the medium-voltage network" (1/2017) describes a successful field test in Essen.
The world's longest superconducting cable renders substation obsolete
The new cable, one kilometre long, connects two substations across the city centre. It replaces a conventional 110 kV line and renders one substation in the inner city obsolete. In a test phase of the "AmpaCity" project, taking over two and a half years, it was shown that the technology is on the threshold of market maturity. The superconducting cable and the superconducting fault current limiter installed as a short-circuit protection measure work reliably. The test route has already transmitted more than 200 million kilowatt-hours.
Since superconductivity only works at very low temperatures, the cables in the Essen facility are being constantly cooled with liquid nitrogen. At the cable inlet, it has a temperature of minus 206 °C, at the cable outlet of minus 201 °C. A subcooler cools it back to the required inlet temperature via a heat exchanger. Despite the high effort involved in cooling, preliminary investigations have shown that superconducting cables are the only sensible way of avoiding high-voltage cables as well as resource and space-consuming substations in inner city areas.
The AmpaCity project is conducted under the direction of the energy suppliers innogy SE and carried out jointly with their project partners.
You found all informations about the BINE Projektinfo brochure entitled "Superconductors for the medium-voltage network" here:
http://www.bine.info/en/press/press-releases/press/pressemitteilung/supraleiter-...
Uwe Milles/Birgit Schneider
presse(at)bine.info
About BINE Information Service
Energy research for practical applications
The BINE Information Service reports on energy research topics, such as new materials, systems and components, as well as innovative concepts and methods. The knowledge gained is incorporated into the implementation of new technologies in practice, because first-rate information provides a basis for pioneering decisions, whether in the planning of energy-optimised buildings, increasing the efficiency of industrial processes, or integrating renewable energy sources into existing systems.
About FIZ Karlsruhe
FIZ Karlsruhe – Leibniz Institute for Information Infrastructure is a not-for-profit organization with the public mission to make sci-tech information from all over the world publicly available and to provide related services in order to support the national and international transfer of knowledge and the promotion of innovation.
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FIZ Karlsruhe is a member of the Leibniz Association (WGL) which consists of 87 German research and infrastructure institutions.
http://www.bine.info/en - BINE Informationsdienst
BINE Projektinfo brochure "Superconductors for the medium-voltage network"
Source: © BINE Informationsdienst
A superconducting cable requires much less space compared to traditional cables of equal transmissio ...
Source: © innogy SE
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