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IEEE C57.146

2005 Edition, September 22, 2005

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Guide for the Interpretation of Gases Generated in Silicone-Immersed Transformers

Includes all amendments and changes through Reaffirmation Notice , June 16, 2011

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Description / Abstract:

This guide is intended to apply to silicone-immersed transformers in which the silicone fluid was the fluid supplied when the transformer was originally manufactured. This guide also addresses the following:

- 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

- 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.