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  • IEC 62535:2008

    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, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English - French, Spanish, Castilian

    Published date:  08-10-2008

    Publisher:  International Electrotechnical Committee

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    Abstract - (Show below) - (Hide below)

    IEC 62535:2008 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.

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

    Committee TC 10
    Development Note Stability Date: 2022. (12/2017)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    09/30213528 DC : 0 BS EN 60296 - FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED MINERAL INSULATING OIL FOR TRANSFORMERS AND SWITCHGEAR
    BS EN 60422:2013 Mineral insulating oils in electrical equipment. Supervision and maintenance guidance
    12/30257150 DC : 0 BS EN 62770 - FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED NATURAL ESTERS LIQUIDS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT
    S.R. CLC/TR 50503:2010 GUIDELINES FOR THE INVENTORY CONTROL, MANAGEMENT, DECONTAMINATION AND/OR DISPOSAL OF ELECTRICAL EQUIPMENT AND INSULATING LIQUIDS CONTAINING PCBS
    PD IEC/TR 62697-3:2018 Test methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids Test method for quantitative determination of elemental sulfur
    CEI EN 62040-4 : 2014 UNINTERRUPTIBLE POWER SYSTEMS (UPS) - PART 4: ENVIRONMENTAL ASPECTS - REQUIREMENTS AND REPORTING
    I.S. EN 62701:2014 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - RECYCLED MINERAL INSULATING OILS FOR TRANSFORMERS AND SWITCHGEARS
    I.S. EN 60296:2012 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED MINERAL INSULATING OILS FOR TRANSFORMERS AND SWITCHGEAR (IEC 60296:2012 (EQV))
    IEC TR 62697-2:2018 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)
    I.S. EN 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) (IEC 62697-1:2012 (EQV))
    IEC 60296 REDLINE : 4.0 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED MINERAL INSULATING OILS FOR TRANSFORMERS AND SWITCHGEAR
    EN 62040-4:2013 Uninterruptible power systems (UPS) - Part 4: Environmental aspects - Requirements and reporting
    EN 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)
    EN 62701:2014 Fluids for electrotechnical applications - Recycled mineral insulating oils for transformers and switchgears
    OVE EN IEC 60296:2023 01 01 Fluids for electrotechnical applications - Mineral insulating oils for electrical equipment
    I.S. EN 60422:2013 MINERAL INSULATING OILS IN ELECTRICAL EQUIPMENT - SUPERVISION AND MAINTENANCE GUIDANCE (IEC 60422:2013 (EQV))
    10/30233636 DC : 0 IEC 62697-1 ED.1 - INSULATING LIQUIDS - QUANTITATIVE DETERMINATION OF CORROSIVE SULFUR COMPOUNDS IN USED AND UNUSED INSULATING LIQUIDS - PART 1: TEST METHOD FOR QUANTITATIVE DETERMINATION OF DIBENZYL DISULFIDE (DBDS)
    BS EN 62697-1:2012 Test methods for quantitative determination of corrosive sulphur compounds in unused and used insulating liquids Test method for quantitative determination of dibenzyldisulfide (DBDS)
    17/30331680 DC : 0 BS ISO 18095 - CONDITION MONITORING AND DIAGNOSTICS OF POWER TRANSFORMERS
    BS EN 60296:2012 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED MINERAL INSULATING OILS FOR TRANSFORMERS AND SWITCHGEAR
    10/30215366 DC : 0 BS EN 60422 - MINERAL INSULATING OILS IN ELECTRICAL EQUIPMENT - SUPERVISION AND MAINTENANCE GUIDANCE
    NF EN 62770 : 2014 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED NATURAL ESTERS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT
    I.S. EN 62040-4:2013 UNINTERRUPTIBLE POWER SYSTEMS (UPS) - PART 4: ENVIRONMENTAL ASPECTS - REQUIREMENTS AND REPORTING (IEC 62040-4:2013 (EQV))
    CEI EN 60296 : 2013 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED MINERAL INSULATING OILS FOR TRANSFORMERS AND SWITCHGEAR
    IEC 62770:2013 Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
    UNE-EN 62697-1:2013 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)
    EN 60296:2012 Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear
    CEI EN 62770 : 2014 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED NATURAL ESTERS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT
    11/30235371 DC : 0 BS EN 62701 - FLUIDS FOR ELECTRO TECHNICAL APPLICATIONS - RECYCLED MINERAL INSULATING OILS FOR TRANSFORMERS AND SWITCHGEARS
    NF EN 62697-1 : 2013 LIQUIDES ISOLANTS - METHODES D'ESSAI POUR LA DETERMINATION QUANTITATIVE DES COMPOSES DE SOUFRE CORROSIF DANS LES LIQUIDES ISOLANTS USAGES ET NEUFS - PARTIE 1: METHODE D'ESSAI POUR LA DETERMINATION QUANTITATIVE DU DISULFURE DE DIBENZYLE (DBDS)
    BS EN 62770:2014 Fluids for electrotechnical applications. Unused natural esters for transformers and similar electrical equipment
    BS EN 62040-4:2013 (published 2013-10) Uninterruptible power systems (UPS) Environmental aspects. Requirements and reporting
    IEEE C57.140 : 2006 EVALUATION AND RECONDITIONING OF LIQUID IMMERSED POWER TRANSFORMERS
    I.S. EN 62770:2014 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - UNUSED NATURAL ESTERS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT
    ISO 18095:2018 Condition monitoring and diagnostics of power transformers
    I.S. EN 60079-6:2015 EXPLOSIVE ATMOSPHERES - PART 6: EQUIPMENT PROTECTION BY LIQUID IMMERSION 'O'
    IEC 60079-6:2015 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
    UNE-EN 60079-6:2016 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
    IEC 62040-4:2013 Uninterruptible power systems (UPS) - Part 4: Environmental aspects - Requirements and reporting
    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)
    UNE-EN 60296:2012 Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear
    UNE-EN 60422:2013 Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
    IEC 60422:2013 Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
    CAN/CSA-C50-14 (R2018) Mineral insulating oil, electrical, for transformers and switches
    UNE-EN 62770:2014 Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
    13/30267448 DC : 0 BS EN 60079-6 ED 4.0 - EXPLOSIVE ATMOSPHERES - PART 6: EQUIPMENT PROTECTION BY LIQUID IMMERSION 'O'
    CEI EN 60079-6 : 2016 EXPLOSIVE ATMOSPHERES - PART 6: EQUIPMENT PROTECTION BY LIQUID IMMERSION 'O'
    BS EN 60079-6:2007 EXPLOSIVE ATMOSPHERES - PART 6: EQUIPMENT PROTECTION BY BY LIQUID IMMERSION 'O'
    CLC/TR 50503 : 2010 Guidelines for the inventory control, management, decontamination and/or disposal of electrical equipment and insulating liquids containing PCBs
    IEC TR 62697-3:2018 Test methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids - Part 3: Test method for quantitative determination of elemental sulfur
    IEC 60296:2012 RLV Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear
    EN 62770:2014 Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
    EN 60079-6:2015 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
    EN 60422:2013 Mineral insulating oils in electrical equipment - Supervision and maintenance guidance

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

    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
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