• IEC TR 62697-2:2018

    Current The latest, up-to-date edition.

    Test methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids - Part 2: Test method for quantitative determination of total corrosive sulfur (TCS)

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English

    Published date:  14-02-2018

    Publisher:  International Electrotechnical Committee

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    Table of Contents - (Show below) - (Hide below)

    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Sampling
    5 Procedure
    6 Instrument set-up
    7 Precision data
    8 Report
    Annex A (informative) - Figures with typical chromatograms
            and results
    Annex B (informative) - RRT results for quantitative
            determination of corrosive sulfur

    Abstract - (Show below) - (Hide below)

    IEC TR 62697-2:2018(E) specifies a test method for the quantitative determination of total corrosive sulfur (TCS) in unused and used insulating liquids and solid matrices through the conversion of corrosive sulfur species to metal (copper, silver etc.) sulfides. The sulfides formed are quantitatively converted to sulfates; sulfates are determined through turbidity measurement or with ion chromatography.
    The method is applicable with the following matrices:
    a) Unused and used insulating liquids, for example mineral insulating oils and natural esters, which allow the determination of corrosive sulfur compounds over concentrations ranging between 2,5 mg kg-1 to 80 mg kg-1 TCS.
    b) Solid matrices that come in contact with the insulating liquid, for example insulating papers in electrical equipment. The quantification limits for these matrices depend on the amount of matrix used during the determination. The method can be used for the quantitative or semi-quantitative determination of copper sulfide on paper after the test according to IEC 62535. The method can provide unambiguous quantitative assessment of copper sulfide present on paper rather than qualitative results obtained with the SEM-EDX examination stipulated in case of doubts in the interpretation of results obtained from the inspection of paper according to IEC 62535:2008, 6.3.
    c) Paper and other solid insulating material/s obtained from failed transformers, reactors and other electrical equipment to assist in failure diagnostics.
    d) Metal deactivator or passivators additives present in insulating liquids (qualitative assessment).
    However, the method is not applicable for assessing corrosion phenomena for example the dissolution of copper in insulating liquids and deposition on solid matrices, which do not lead to sulfide formation.

    General Product Information - (Show below) - (Hide below)

    Committee TC 10
    Development Note Stability Date: 2024. (02/2018)
    Document Type Technical Report
    Publisher International Electrotechnical Committee
    Status Current

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions
    IEC 60422:2013 Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
    IEC 60050-212:2010 International Electrotechnical Vocabulary (IEV) - Part 212: Electrical insulating solids, liquids and gases
    EN 13601:2013 Copper and copper alloys - Copper rod, bar and wire for general electrical purposes
    IEC 62535:2008 Insulating liquids - Test method for detection of potentially corrosive sulphur in used and unused insulating oil
    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 60296:2012 RLV Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear
    IEC 62697-1:2012 Test methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids - Part 1: Test method for quantitative determination of dibenzyldisulfide (DBDS)
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