IEEE C57.146-2025

This guide is intended to apply to silicone-immersed transformers in which the silicone liquid was the liquid supplied when the transformer was originally manufactured. This guide addresses the following:--The theory of combustible gas generation in a silicone-filled transformer--Recommended procedures for sampling and analysis--The interpretation of gas analysis--Recommended actions based on the interpretation of results--A bibliography of related literature

The purpose of this guide is to assist the transformer operator in evaluating dissolved gas analysis (DGA) data obtained for silicone-filled transformers. Other techniques such as fixed instruments and gas space analysis may well have utility for silicone-filled units; however, due to a lack of data at this time, this guide will focus only on DGA.

Revision Standard - Active. This guide is intended to apply to silicone-immersed transformers for which the silicone liquid was the liquid supplied when the transformer was originally manufactured. It does not address transformers that have been retro-filled. The theory of combustible gas generation in a silicone-filled transformer, recommended procedures for sampling and analysis, recommended actions based on the interpretation of results, and a bibliography of related literature are addressed in this guide.