The volume of electricity generated by wind energy and photovoltaic systems is increasing in the German power grid. This electricity has to be transported over long distances to urban areas and industrial centres. Newly developed high-temperature conductors now offer a way of increasing the maximum power capacity that can be transmitted through existing power lines. The BINE Projektinfo brochure entitled "The hotline in the grid" (13/2016) presents the new transmission lines. With a comparable conductor cross-section, these can almost double the transport capability of existing transmission lines.
Greater utilisation of existing transmission lines
With an increasing current flow, overhead lines heat up as a result of the electrical resistance. Current transmission lines limit the long-range transport of short-term, regional electricity surpluses in the grid, as they are only designed for a maximum temperature of 80 °C.
The newly developed high-temperature conductor cables, on the other hand, can withstand temperatures of up to 210 °C. This makes it possible to transport greater amounts of electricity, thus preventing network congestion.
Inside the conductors, composite materials are used based on carbon fibres and aluminium ceramic as well as special aluminium and steel alloys. This has therefore solved the problem of greater sagging at higher temperatures, since the new transmission lines sag less than the previous ones.
The new high-temperature conductors can also increase the flexibility in the grid for short-term power peaks. By default, overhead lines are operated in Germany below the maximum possible capacity. The Institute for High Voltage Technology at RWTH Aachen University has conducted the research together with industrial partners.
You found all informations about the BINE Projektinfo brochure entitled "The hotline in the grid" here:
Uwe Milles/Birgit Schneider
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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http://www.bine.info/en - BINE Informationsdienst
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