This document gives guidelines to the transformer operator in evaluating dissolved gas analysis (DGA) data obtained from natural ester according to IEC 62770 and synthetic ester according to IEC 61099 in liquid filled transformers and similar equipment.
This document includes the following:
gas generation in a natural and synthetic ester-filled transformer;
DGA interpretation methods;
gas concentration guide values valid for the use of DGA interpretation tools;
interpretation of the dissolved gas analysis results;
recommended actions based on the interpretation of dissolved gas analysis results;
examples of faulty equipment.
IN_DEVELOPMENT
IEC 63585 ED1
50.20
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15 maj 2026
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