DocumentCode :
2759267
Title :
Investigations on the dielectric strength of syntactic foam at cryogenic temperature and the impact of the filler material on the volume shrinkage
Author :
Winkel, D. ; Schnettler, A.
Author_Institution :
Inst. for High Voltage Technol., RWTH Aachen Univ., Aachen, Germany
fYear :
2012
fDate :
10-13 June 2012
Firstpage :
582
Lastpage :
586
Abstract :
This paper deals with syntactic foam as a solid substitution of liquid nitrogen (LN2) based insulation systems for superconducting power cables. Syntactic foam consists of a polymeric matrix and gas-filled microspheres with a mean diameter of several 10 μm serving as filler material. As microspheres feature lower density and price compared to the matrix materials, such hybrid insulation systems become lighter and cheaper than pure materials. The microspheres are also able to reduce shrinking during cooling down to cryogenic temperature significantly. Epoxy resin and unsaturated polyester resin are investigated regarding their ability to serve as a suitable matrix as well as untreated glass, silanated glass and ceramic microspheres to serve as filler. Firstly, the impact of the hollow microsphere material on the volume shrinkage of syntactic foam is observed. Additionally, the dielectric strength under AC stress of several formations of syntactic foam at liquid nitrogen temperature (LNT) and at ambient temperature is determined. Finally, the results are compared to identify both the influence of the hollow microspheres´ material and the impact of temperature on the breakdown field strength of syntactic foam.
Keywords :
electric strength; polymer foams; power cable insulation; resins; superconducting cables; AC stress; breakdown field strength; ceramic microspheres; cryogenic temperature; dielectric strength; epoxy resin; filler material; gas-filled microspheres; hollow microsphere material; hybrid insulation systems; liquid nitrogen; matrix materials; polymeric matrix; pure materials; silanated glass; solid substitution; superconducting power cables; syntactic foam; unsaturated polyester resin; untreated glass; volume shrinkage; Ceramics; Cryogenics; Electric breakdown; Erbium; Glass; Syntactics; breakdown field strength; cryogenic temperature; electrical insulation; superconducting power cable; syntactic foam;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation (ISEI), Conference Record of the 2012 IEEE International Symposium on
Conference_Location :
San Juan, PR
ISSN :
1089-084X
Print_ISBN :
978-1-4673-0488-7
Electronic_ISBN :
1089-084X
Type :
conf
DOI :
10.1109/ELINSL.2012.6251537
Filename :
6251537
Link To Document :
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