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)

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)

Status : Current   Published : March 2018

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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.




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)
StatusCurrent
Publication Date08 March 2018
Normative References(Required to achieve compliance to this standard)IEC 62697-1
Informative References(Provided for Information)IEC 60422, ISO 5725-1, DIN 51353, IEC 60296, EN 13601, ASTM D130, CIGRE Technical report 378, IEC 60475, IEC 60050-212, IEC 60567, IEC 62535:2008, ASTM D1275 - 15
International RelationshipsIEC/TR 62697-2:2018
DescriptorsKinematic viscosity, Insulating oils, Maintenance, Dielectric properties, Moisture, Transformers, Liquid electrical insulating materials, Storage, Flash point, Silicon organic compounds, Electrical insulation, Breakdown voltage, Density, Electrical engineering, Electric insulators, Flammability, Electrical insulating materials, Colour, Electrical equipment, Fire point (temperature), Pour point, Refractive index, Silicones
ICS29.040.10
CommitteeGEL/10
ISBN978 0 580 97760 2
PublisherBSI
FormatA4
DeliveryYes
Pages24
File Size790 KB
Price£182.00


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