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Bjoerstad R.,CERN | Scheuerlein C.,CERN | Rikel M.O.,Nexans SuperConductors GmbH | Ballarino A.,CERN | And 6 more authors.
Superconductor Science and Technology | Year: 2015

The strain induced critical current degradation of overpressure processed straight Bi-2212/Ag wires has been studied at 77 K in self-field. For the first time superconducting properties, lattice distortions, composite wire stress and strain have been measured simultaneously in a high energy synchrotron beamline. A permanent Ic degradation of 5% occurs when the wire strain exceeds 0.60%. At a wire strain of about 0.65% a drastic n-value and Ic reduction occur, and the composite stress and the Bi-2212 lattice parameter reach a plateau, indicating Bi-2212 filament fracturing. The x-ray diffraction measurements show that Bi-2212 exhibits linear elastic behaviour up to the irreversible strain limit. © 2015 IOP Publishing Ltd.


Stemmle M.,Nexans Deutschland GmbH | Merschel F.,RWE AG | Noe M.,Karlsruhe Institute of Technology | Hobl A.,Nexans SuperConductors GmbH
IET Conference Publications | Year: 2013

In recent years significant progress has been made in the development of high temperature superconducting (HTS) power devices, in particular cables and fault current limiters. Several field tests of large scale prototypes for both applications have been successfully accomplished and the technologies are getting closer to commercialization. In this paper the German AmpaCity project will be introduced and its objectives will be described. Furthermore, the conceptual design of the HTS cable system and the major developments which have been achieved so far, as well as the current status of the project will be reported.


Stemmle M.,Nexans Deutschland GmbH | Merschel F.,RWE AG | Noe M.,Karlsruhe Institute of Technology | Hobl A.,Nexans SuperConductors GmbH
Proceedings of the IEEE Power Engineering Society Transmission and Distribution Conference | Year: 2014

In this paper the German AmpaCity project, which started in September 2011, will be introduced and the conceptual design of the main components will be described. The objective of the project is developing, manufacturing and installing a 10 kV, 40 MVA high temperature superconducting (HTS) system consisting of a fault current limiter and of a 1 km cable in the city of Essen. AmpaCity serves as a lighthouse project, since it is the first time that a one kilometer HTS cable system will be installed together with an HTS fault current limiter in a real grid application within a city center area. In addition it will be the longest installed HTS cable system worldwide. Within the project the development phase was finished in March 2013 with successfully completing the type test of the cable system. Subsequently, manufacturing of the different components for the installation has started and the system is expected to be commissioned by the end of 2013. © 2014 IEEE.


Stemmle M.,Nexans Deutschland GmbH | Merschel F.,RWE AG | Noe M.,Karlsruhe Institute of Technology | Hobl A.,Nexans SuperConductors GmbH
2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2013 | Year: 2013

In this paper the German AmpaCity project, which started in September 2011, will be introduced and the conceptual design of the main components will be described. The objective of the project is developing, manufacturing and installing a 10 kV, 40 MVA high temperature superconducting (HTS) system consisting of a fault current limiter and of a 1 km cable in the city of Essen. AmpaCity serves as a lighthouse project, since it is the first time that a one kilometer HTS cable system will be installed together with an HTS fault current limiter in a real grid application within a city center area. In addition it will be the longest installed HTS cable system worldwide. Within the project the development phase was finished in March 2013 with successfully completing the type test of the cable system. Subsequently, manufacturing of the different components for the installation has started and the system is expected to be commissioned by the end of 2013. © 2013 IEEE.


Stemmle M.,Nexans Deutschland GmbH | Merschel F.,RWE AG | Noe M.,Karlsruhe Institute of Technology | Hobl A.,Nexans SuperConductors GmbH
2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2013 | Year: 2013

High temperature superconducting (HTS) power cables can provide electric utilities with a new way to solve power distribution issues in densely populated urban areas. Compared to conventional cable technologies, based on copper or aluminum, HTS cables can either carry several times more power at the same voltage due to the huge current transport capacity of HTS materials which is more than 150 times that of copper, or carry the same amount of power at a lower voltage level. As long as the current carried by the cable is below the so-called critical current of the cable, HTS cables exhibit no ohmic power loss for direct currents and just very small losses for alternating currents (AC). High temperature superconductor materials typically used in cables are tapes with critical current densities of > 100 A/mm2 when cooled in liquid nitrogen. Consequently, cables made of these conductors can carry large currents within very small dimensions. In addition, HTS cables are especially suited for densely-populated areas as they do not exhibit any electromagnetic or thermal impact on the environment, and only require a very narrow right-of-way, basically limited to the cable itself. © 2013 IEEE.

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