IEC 62770:2013 PDF (Not Available)

IEC 62770:2013 is a standard that provides specifications and test methods for the use of natural esters in transformers and similar electrical equipment. These natural esters are used as an insulating and heat transfer medium in these devices. The standard covers both pure natural esters and natural esters with additives. It is important to note that natural esters have a different chemical composition compared to insulating mineral oils and other fluids with high fire points.

The standard also mentions that natural esters with low viscosity are not covered in this standard but provides relevant properties of such fluids in Annex B. It is essential to highlight that this standard applies only to unused natural esters and does not cover reclaimed natural esters or natural esters blended with non-natural fluids.