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COPPER SULPHIDE IN TRANSFORMER INSULATION

Working Group A2.32

April 09

CIGRE WG A2.32

Copper sulphide in transformer insulation
MEMBERS: M. Dahlund, Sweden (convenor) I. Atanasova-Höhlein, Germany (leader TF 1) R. Maina, Italy (leader TF 2) N. Dominelli, Canada (leader TF 3) T. Ohnstad, Norway (leader TF 4) T. Amimoto, Japan C. Claiborne, USA M.-H. Ese, Norway J. Lukic, SerbiaV. Mezhvynskiy, Germany Ch. Perrier, France P. Smith, Germany J. Tanimura, Japan Y. Bertrand, France A. de Pablo, Spain P. Griffin, USA L. Lundgaard, Norway J. L. Nunes Jr., Brazil F. Scatiggio, Italy K. Sundkvist, Sweden J. Van Peteghem, Belgium

CORRESPONDING MEMBERS: X. Chendong, China Y. Vachiratarapadorn, Thailand

FORMER MEMBERS: V. Null, Germany V. Sokolov, Ukraine† Eric Sandré,France

Copyright©2009 “Ownership of a CIGRE publication, whether in paper form or on electronic support only infers right of use for personal purposes. Are prohibited, except if explicitly agreed by CIGRE, total or partial reproduction of the publication for use other than personal and transfer/selling to a third party. Hence circulation on any intranet or other company network isforbidden”. Disclaimer notice “CIGRE gives no warranty or assurance about the contents of this publication, nor does it accept any responsibility, as to the accuracy or exhaustiveness of the information. All implied warranties and conditions are excluded to the maximum extent permitted by law”.

ISBN: 978-2-85873-065-0

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TABLE OF CONTENTS 1 2 2.1 2.2 2.3 2.4 3 3.1 3.2 3.3 4 4.1 4.2 4.3 4.4 4.5 55.1 5.2 5.3 5.4 6 6.1 6.2 7 INTRODUCTION ..................................................................................................................................... 3 THE PHENOMENON............................................................................................................................... 5 Copper sulphide formation.................................................................................................................. 8 Dielectric failure mechanism ............................................................................................................. 12 Influence of application and design ................................................................................................... 13 Influence of service conditions andoil maintenance......................................................................... 14 DIAGNOSTICS ...................................................................................................................................... 15 Oil testing...........................................................................................................................................15 Tests other than oil tests to detect deposits ...................................................................................... 18 Inspection .......................................................................................................................................... 18 MITIGATION TECHNIQUES................................................................................................................. 19 Metal passivators............................................................................................................................... 19 Removal of corrosive sulphur from oil in service............................................................................... 25 Oilexchange...................................................................................................................................... 25 Modified operating conditions............................................................................................................ 26 Removal of deposits .......................................................................................................................... 27 RECOMMENDATIONS...
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