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Failure Analysis of a High Voltage Feedthrough of Indus-2 Synchrotron Radiation Source

Schadensanalyse einer Hochspannungsdurchführung der Synchrotronstrahlenquelle Indus-2
R. K. Gupta

obtained his M.Sc degree in chemistry from Banaras Hindu University in 2007and joined BARC training school at Kalpakkam in 2008. He has primarily worked in localized corrosion studies on austenitic stainless steel and material degradation. His current interests include various surface treatment and laser surface modification for enhanced corrosion resistance of engineering materials.

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, M. O. Ittoop , S. K. Rai , R. Singh , M. K. Singh , P. Ganesh and R. Kaul
From the journal Practical Metallography

Abstract

In this paper, a failure analysis of a high voltage feedthrough of the Indus 2 synchrotron radiation source which brought about venting of the vacuum chamber is discussed. A detailed failure analysis demonstrated that the main cause responsible for the failure of the feedthrough was high humidity in the atmosphere surrounding the feedthrough assembly, which resulted in the corrosion of CuSil braze filler alloy at the ground terminal and also caused flashover between positive (+) and ground terminals. Thermal cycling of the insulator due to flashover resulted in spalling of glazed surface layer and assisted crack propagation from the flashover-generated surface defects. The remedial measures recommended to avoid similar failure include: thorough cleaning of feedthrough and its connectors before installation, use gasket-type sealing in the protective cover of the connector on the air side, use of metallic tubes in place of polyurethane cooling water tubes and design change of feedthrough to shift brazed joint to vacuum side.

Kurzfassung

Dieser Beitrag befasst sich mit der Schadensanalyse einer Hochspannungsdurchführung der Synchrotronstrahlenquelle Indus-2, dessen Versagen zu einer Belüftung der Vakuumkammer geführt hat. In einer eingehenden Schadensanalyse wurde hohe, in der Atmosphäre um die Durchführungsbaugruppe auftretende Luftfeuchtigkeit als für das Versagen der Durchführung verantwortliche Hauptursache ermittelt. Das führte zur Korrosion der CuSilHartlotlegierung an der Erdungsklemme und verursachte zudem einen Überschlag zwischen der positiven (+) und der Erdungsklemme. Aufgrund der Temperaturwechselbeanspruchung des Isolators durch Überschlag platzte die glasierte Oberflächenschicht ab. Von diesen vom Überschlag verursachten Oberflächendefekten ausgehend konnten sich wiederum Risse ausbilden. Nachstehend werden unter anderem folgende Abhilfemaßnahmen empfohlen, um das Auftreten ähnlicher Versagensfälle zu vermeiden: gründliche Reinigung der Durchführung und entsprechender Anschlüsse vor dem Einbau, Gebrauch einer Art Flachdichtung für die Schutzabdeckung des luftseitigen Anschlusses, Einsatz von Metallrohren anstelle der Kühlwasserschläuche aus Polyurethan und konstruktive Änderung an der Durchführung in Form einer vakuumseitigen Ausführung der Hartlötverbindung.

About the author

R. K. Gupta

obtained his M.Sc degree in chemistry from Banaras Hindu University in 2007and joined BARC training school at Kalpakkam in 2008. He has primarily worked in localized corrosion studies on austenitic stainless steel and material degradation. His current interests include various surface treatment and laser surface modification for enhanced corrosion resistance of engineering materials.

Acknowledgement

The authors are thankful to Shri D. P. Yadav, head, UHVS, Shri Sohan Lal and Shri Chander Kant of Synchrotron Utilization Section for many useful discussions during the course of the investigation. They are immensely thankful to Dr. D. V. Ghodke, head, Ion Source Development & Diagnostics Section for reviewing the draft report and providing many useful suggestions. The authors thankfully acknowledge the help of Shri Abhijit Choudhury for the XRF analysis and Shri Ram Nihal Ram for the metallographic specimen preparation.

Danksagung

Die Autoren bedanken sich bei Shri D. P. Yadav, Leiter UHVS, Shri Sohan Lal und Shri Chander Kant von der Synchrotron Utilization Section (etwa: Abteilung für die Nutzung von Synchrotronstrahlung) für zahlreiche hilfreiche Gespräche im Laufe der Untersuchung. Sie danken Dr. D. V. Ghodke, Leiter der Ion Source Development & Diagnostics Section (etwa: Abteilung Ionenquellenentwicklung und -diagnostik), sehr für die Durchsicht des Entwurfs und seine zahlreichen nützlichen Anregungen. Die Autoren bedanken sich für die Unterstützung durch Shri Abhijit Choudhury bei der XRF-Analyse und bei Shri Ram Nihal Ram für die metallographische Probenpräparation.

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Received: 2020-09-10
Accepted: 2021-01-30
Published Online: 2021-06-18
Published in Print: 2021-06-30

© 2021 Walter de Gruyter GmbH, Berlin/Boston, Germany

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