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Characterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply line

Cable-in-conduit conductors of the ITER magnet system are directly cooled by supercritical helium. Insulation breaks are required in the liquid helium feed pipes to isolate the high voltage system of the magnet windings from the electrically grounded helium coolant supply line. They are submitted to...

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Autores principales: Fernandez Pison, P, Sgobba, S, Santillana, I Aviles, Langeslag, S A E, Su, M, Piccin, R, Journeaux, J Y, Laurenti, A, Pan, W
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1757-899X/279/1/012007
http://cds.cern.ch/record/2622108
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author Fernandez Pison, P
Sgobba, S
Santillana, I Aviles
Langeslag, S A E
Su, M
Piccin, R
Journeaux, J Y
Laurenti, A
Pan, W
author_facet Fernandez Pison, P
Sgobba, S
Santillana, I Aviles
Langeslag, S A E
Su, M
Piccin, R
Journeaux, J Y
Laurenti, A
Pan, W
author_sort Fernandez Pison, P
collection CERN
description Cable-in-conduit conductors of the ITER magnet system are directly cooled by supercritical helium. Insulation breaks are required in the liquid helium feed pipes to isolate the high voltage system of the magnet windings from the electrically grounded helium coolant supply line. They are submitted to high voltages and significant internal helium pressure and will experience mechanical forces resulting from differential thermal contraction and electro-mechanical loads. Insulation breaks consist essentially of stainless steel tubes overwrapped by an outer glass – fiber reinforced composite and bonded to an inner composite tube at each end of the stainless steel fittings. For some types of insulator breaks Glass – Kapton – Glass insulation layers are interleaved in the outer composite. Following an extensive mechanical testing campaign at cryogenic temperature combined with leak tightness tests, the present paper investigates through non-destructive and destructive techniques the physical and microstructural characteristics of the low temperature high voltage insulation breaks and of their individual components, thus allowing to correlate the structure and properties of the constituents to their overall performance. For all the tests performed, consistent and reproducible results were obtained within the range of the strict acceptance criteria defined for safe operation of the insulation breaks.
id oai-inspirehep.net-1674999
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling oai-inspirehep.net-16749992019-10-15T15:17:32Zdoi:10.1088/1757-899X/279/1/012007http://cds.cern.ch/record/2622108engFernandez Pison, PSgobba, SSantillana, I AvilesLangeslag, S A ESu, MPiccin, RJourneaux, J YLaurenti, APan, WCharacterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply lineDetectors and Experimental TechniquesCable-in-conduit conductors of the ITER magnet system are directly cooled by supercritical helium. Insulation breaks are required in the liquid helium feed pipes to isolate the high voltage system of the magnet windings from the electrically grounded helium coolant supply line. They are submitted to high voltages and significant internal helium pressure and will experience mechanical forces resulting from differential thermal contraction and electro-mechanical loads. Insulation breaks consist essentially of stainless steel tubes overwrapped by an outer glass – fiber reinforced composite and bonded to an inner composite tube at each end of the stainless steel fittings. For some types of insulator breaks Glass – Kapton – Glass insulation layers are interleaved in the outer composite. Following an extensive mechanical testing campaign at cryogenic temperature combined with leak tightness tests, the present paper investigates through non-destructive and destructive techniques the physical and microstructural characteristics of the low temperature high voltage insulation breaks and of their individual components, thus allowing to correlate the structure and properties of the constituents to their overall performance. For all the tests performed, consistent and reproducible results were obtained within the range of the strict acceptance criteria defined for safe operation of the insulation breaks.oai:inspirehep.net:16749992017
spellingShingle Detectors and Experimental Techniques
Fernandez Pison, P
Sgobba, S
Santillana, I Aviles
Langeslag, S A E
Su, M
Piccin, R
Journeaux, J Y
Laurenti, A
Pan, W
Characterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply line
title Characterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply line
title_full Characterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply line
title_fullStr Characterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply line
title_full_unstemmed Characterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply line
title_short Characterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply line
title_sort characterization of low temperature high voltage axial insulator breaks for the iter cryogenic supply line
topic Detectors and Experimental Techniques
url https://dx.doi.org/10.1088/1757-899X/279/1/012007
http://cds.cern.ch/record/2622108
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