IEC 62770 ED2

Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment IEC 62770 ED2

Scope

IEC 62770 ED2: 2024 (EN) describes specifications and test methods for unused natural esters in transformers and similar liquid-immersed electrical equipment in which a liquid is required as an insulating and heat transfer medium. The exposure of natural ester to air leads to deterioration of the insulating liquid. Use of natural esters is therefore restricted to sealed units, or with the conservator tank protected from the contact with atmosphere by a membrane or other suitable system.