Test of a DC-HTS Busbar Demonstrator for Power Distribution in Hybrid-Electric Propulsion Systems for Aircraft

In the framework of the German project TELOS (Thermo-Electrically Optimised Aircraft Propulsion Systems) a high-temperature superconducting 40 MVA DC demonstrator busbar for hybrid-electric propulsion systems for aircraft has been developed. The design current for a temperature below 25 K is 13.3 kA...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2022-05, Vol.1241 (1), p.12037
Main Authors: Schlachter, S I, Brand, J, Elschner, S, Fink, S, Holzapfel, B, Kudymow, A, Willms, J
Format: Article
Language:English
Subjects:
Aircraft
Aircraft propulsion
Alternating current
Busbars
Conductors
Current pulses
Current voltage characteristics
Diameters
Electric contacts
Electric power distribution
High temperature
Hybrid propulsion systems
Liquid nitrogen
Lorentz force
Thermal simulation
Three dimensional printing
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Summary:In the framework of the German project TELOS (Thermo-Electrically Optimised Aircraft Propulsion Systems) a high-temperature superconducting 40 MVA DC demonstrator busbar for hybrid-electric propulsion systems for aircraft has been developed. The design current for a temperature below 25 K is 13.3 kA and the rated voltage is 3 kV. The 2-pole busbar contains 2 stacks of REBCO coated conductors which are supported by a 3D-printed structure allowing compensation of thermal length changes of the superconductor. It fits in a cryostat tube with an inner diameter of 25 mm. A special focus has been put on low-resistive joints that are necessary to connect single elements of the busbar system. The special layout of the joints allows an effective current redistribution between the different tapes in a stack. We present results for the test of the DC busbar demonstrator in liquid nitrogen at 77 K. The design current for this temperature is 3.3 kA which corresponds to a rated power of 10 MW. We applied currents up to 3.5 kA and measured the I-V characteristics and contact resistances of 90° and 180° joints in a virgin and in a strained state thus simulating thermal length changes. We also present results of Lorentz-Force tests with short AC current pulses up to 20 kA to demonstrate the viability of the design for application with currents up to 13.3 kA.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1241/1/012037