IEC TC 10

IEC TC 10 – Fluids for Electrotechnical Applications

IEC Technical Committee 10 (IEC TC 10) develops International Standards for fluids used in electrotechnical applications, particularly in electrical power equipment and insulation systems.
These standards specify the requirements, testing methods, classification, handling, and maintenance of insulating liquids used in transformers, switchgear, capacitors, and other high-voltage equipment.

IEC TC 10 publications cover mineral insulating oils, synthetic insulating fluids, natural and synthetic esters, and related dielectric liquids.
The standards help ensure reliable electrical insulation, efficient cooling, long service life, and safe operation of electrical equipment.

List of Standard (IEC TC 10):

1. IEC 60156 ___2018 SCAN Insulating liquids – Determination of the breakdown voltage at power frequency – Test method
2. IEC 60247 ___2004 Insulating liquids – Measurement of relative permittivity, dielectric dissipation factor (tan d) and d.c. resistivity
3. IEC 60296 ___2020 Fluids for electrotechnical applications – Mineral insulating oils for electrical equipment
4. IEC 60376 ___2018 Specification of technical grade sulphur hexafluoride (SF₆) and complementary gases to be used in its mixtures for use in electrical equipment
5. IEC 60422 ___2024 SCAN Mineral insulating oils in electrical equipment – Supervision and maintenance guidance
6. IEC 60475___ 2022 Method of sampling insulating liquids
7. IEC 60480 ___2019 Specifications for the re-use of sulphur hexafluoride (SF₆) and its mixtures in electrical equipment
8. IEC 60567 ___2011 Oil-filled electrical equipment – Sampling of free gases and analysis of free and dissolved gases in mineral oils and other insulating liquids – Guidance
9. IEC 60588-1___ 1977 SCAN Askarels for transformers and capacitors. Part 1: General
10. IEC 60588-2 ___1978 SCAN Askarels for transformers and capacitors. Part 2: Test methods
11. IEC 60588-3 ___1977 SCAN Askarels for transformers and capacitors. Part 3: Specifications for new askarels
12. IEC 60588-4 ___1979 SCAN Askarels for transformers and capacitors. Part 4: Guide for maintenance of transformer askarels in equipment
13. IEC 60588-5 ___1979 SCAN Askarels for transformers and capacitors. Part 5: Screening test for compatibility of materials and transformer askarels
14. IEC 60588-6 ___1979 SCAN Askarels for transformers and capacitors. Part 6: Screening test for effects of materials on capacitor askarels
15. IEC 60590 ___1977 SCAN Determination of the aromatic hydrocarbon content of new mineral insulating oils
16. IEC 60599 ___2022 Mineral oil-filled electrical equipment in service – Guidance on the interpretation of dissolved and free gases analysis
17. IEC 60628 ___1985 Gassing of insulating liquids under electrical stress and ionization
18. IEC 60666 ___2010 Detection and determination of specified additives in mineral insulating oils
19. IEC 60814 ___1997 Insulating liquids – Oil-impregnated paper and pressboard – Determination of water by automatic coulometric Karl Fischer titration
20. IEC 60836 ___2015 Specifications for unused silicone insulating liquids for electrotechnical purposes
21. IEC 60897 ___1987 SCAN Methods for the determination of the lightning breakdown voltage of insulating liquids
22. IEC 60944 ___1988 SCAN Guide for the maintenance of silicone transformer liquids
23. IEC 60963 ___1988 SCAN Specification for unused polybutenes
24. IEC 60970 ___2007 Insulating liquids – Methods for counting and sizing particles
25. IEC 61039 ___2008 Classification of insulating liquids
26. IEC 61065 ___1991+COR1–1993 SCAN Method for evaluating the low temperature flow properties of mineral insulating oils after ageing
27. IEC 61099 ___2010 Insulating liquids – Specifications for unused synthetic organic esters for electrical purposes
28. IEC 61125 ___2018 Insulating liquids – Test methods for oxidation stability – Test method for evaluating the oxidation stability of insulating liquids in the delivered state
29. IEC 61181 ___2007+AMD1–2012 Mineral oil-filled electrical equipment – Application of dissolved gas analysis (DGA) to factory tests on electrical equipment
30. IEC 61197 ___1993 Insulating liquids – Linear flame propagation – Test method using a glass-fibre tape
31. IEC 61198 ___1993 Mineral insulating oils – Methods for the determination of 2-furfural and related compounds
32. IEC 61203 ___1992 Synthetic organic esters for electrical purposes – Guide for maintenance of transformer esters in equipment
33. IEC 61294 ___1993 Insulating liquids – Determination of the partial discharge inception voltage (PDIV) – Test procedure
34. IEC 61619 ___1997 Insulating liquids – Contamination by polychlorinated biphenyls (PCBs) – Method of determination by capillary column gas chromatography
35. IEC 61620 ___1998 Insulating liquids – Determination of the dielectric dissipation factor by measurement of the conductance and capacitance – Test method
36. IEC 61946 ___2007 Mineral insulating oils – Characterization of paraffinic/naphthenic nature – Low temperature differential scanning calorimetry (DSC) test method
37. IEC 62021-1 ___2003 Insulating liquids – Determination of acidity – Part 1: Automatic potentiometric titration
38. IEC 62021-2 ___2007 Insulating liquids – Determination of acidity – Part 2: Colourimetric titration
39. IEC 62021-3 ___2014 Insulating liquids – Determination of acidity – Part 3: Test methods for non-mineral insulating oils
40. IEC 62535 ___2008 Insulating liquids – Test method for detection of potentially corrosive sulphur in used and unused insulating oil
41. 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)
42. 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)
43. 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
44. IEC 62770 ___2013 Fluids for electrotechnical applications – Unused natural esters for transformers and similar electrical equipment
45. IEC 62874 ___2015 Guidance on the interpretation of carbon dioxide and 2-furfuraldehyde as markers of paper thermal degradation in insulating mineral oil
46. IEC 62961 ___2018 SCAN Insulating liquids – Test methods for the determination of interfacial tension of insulating liquids – Determination with the ring method
47. IEC 62975 ___2021 SCAN Natural esters – Guidelines for maintenance and use in electrical equipment
48. IEC 63012 ___2019 SCAN Insulating liquids – Unused modified or blended esters for electrotechnical applications