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BS EN 62535:2009

Current
Current

The latest, up-to-date edition.

Insulating liquids. Test method for detection of potentially corrosive sulphur in used and unused insulating oil
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-28-2011

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling
5 Procedure
6 Inspection and interpretation
7 Repeatability and reproducibility
8 Report
Annex A (informative) - Copper strip method to detect corrosive
        and potentially corrosive sulphur in oil
Annex B (informative) - Analysis for copper sulphide on insulating
        paper by scanning electron microscope-energy dispersive
        X-ray spectrometry (SEM/EDX)
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

Describes a test method for detection of potentially corrosive sulphur in used and unused mineral insulating oil.

This International Standard specifies a test method for detection of potentially corrosive sulphur in used and unused mineral insulating oil.

Most recent failures due to corrosive sulphur are related to the formation of copper sulphide deposits in and on the surface of winding cellulosic paper.

The test method uses a copper conductor, wrapped with one layer of paper, immersed in the oil and heated to evaluate the capability of the oil to yield copper sulphide and transfer it to paper layers.

The growth of copper sulphide on bare copper may cause the presence of conductive particulates in the oil, which can act as nuclei for electrical discharge and may lead to a fault. Other test methods exist using a bare copper strip immersed in oil and heated to detect the corrosive behaviour of oil against copper. ASTM D1275 Method B is also used for this test and a modified procedure using low oil volumes is included in Annex A.

Tests with and without paper are considered as complementary and may lead to different results.

Committee
GEL/10
DevelopmentNote
Supersedes 07/30168341 DC. (04/2009)
DocumentType
Standard
Pages
22
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
IEC 62535:2008 Identical
EN 62535:2009 Identical

08/30167496 DC : DRAFT FEB 2008 BS 148 - RECLAIMED MINERAL INSULATING OIL FOR TRANSFORMERS AND SWITCHGEAR - SPECIFICATION
BS 148:2009 Reclaimed mineral insulating oil for transformers and switchgear. Specification

EN 13601:2013 Copper and copper alloys - Copper rod, bar and wire for general electrical purposes
IEC 60475:2011 Method of sampling insulating liquids
IEC 60567:2011 Oil-filled electrical equipment - Sampling of gases and analysis of free and dissolved gases - Guidance
ASTM D 1275 : 2015 Standard Test Method for Corrosive Sulfur in Electrical Insulating Liquids
IEC 60554-3-1:1979 Specification for cellulosic papers for electrical purposes. Part 3-1: Specifications for individual materials. General purpose electrical paper
EN 60567:2011 OIL-FILLED ELECTRICAL EQUIPMENT - SAMPLING OF GASES AND ANALYSIS OF FREE AND DISSOLVED GASES - GUIDANCE (IEC 60567:2011)

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