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  • BSI
    PD IEC/TR 62697-2:2018 Test methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids - Test method for quantitative determination of total corrosive sulfur (TCS)
    Edition: 2018
    $435.35
    / user per year

Description of PD IEC/TR 62697-2:2018 2018

This part of IEC 62697 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:

  1. 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.

  2. 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.

  3. Paper and other solid insulating material/s obtained from failed transformers, reactors and other electrical equipment to assist in failure diagnostics.

  4. 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.



Standard NumberPD IEC/TR 62697-2:2018
TitleTest methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids - Test method for quantitative determination of total corrosive sulfur (TCS)
StatusDefinitive
Publication Date2018-03-08
Identical National Standard OfIEC/TR 62697-2:2018
DescriptorsSilicones, Refractive index, Pour point, Fire point (temperature), Electrical equipment, Colour, Electrical insulating materials, Flammability, Electric insulators, Electrical engineering, Density, Breakdown voltage, Electrical insulation, Silicon organic compounds, Flash point, Storage, Liquid electrical insulating materials, Transformers, Moisture, Dielectric properties, Maintenance, Kinematic viscosity, Insulating oils
ICS29.040.10 Insulating oils
CommitteeGEL/10
ISBN978 0 580 97760 2
PublisherBSI
Pages24

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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