BS EN 62535:2009
Current
The latest, up-to-date edition.
Insulating liquids. Test method for detection of potentially corrosive sulphur in used and unused insulating oil
Hardcopy , PDF
English
28-01-2011
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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.
| Committee |
GEL/10
|
| DevelopmentNote |
Supersedes 07/30168341 DC. (04/2009)
|
| DocumentType |
Standard
|
| Pages |
22
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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.
| 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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