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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum ( )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Posted by: Colin Coombes ( )
Organization:Hydro Tasmania
Date posted: Mon Jun 18 1:34:03 US/Eastern 2001
Subject: Transformer Oil Furan Analysis
I would like to know how some other people assess their Furan level results ie, which of the furans indicate what conditions are occurring inside the transformer? what is considered the level of interest/concern/action required? Is certain level of variation in results between routine testing of particular concern?


Subject: Transformer Furan Levels
Reply Posted by: Bruce Dudley ( )
Organization: Reliability analysis Center
Date Posted: Thu Jun 28 14:24:49 US/Eastern 2001
Transformer oils perform at least four functions for the transformer. Oil provides insulation, cooling and helps extinguish arcs. Oil also dissolves gases generated by oil degradation, moisture and gas from cellulose insulation, deterioration and gases and moisture from whatever atmosphere the oil is exposed. Close observation of the dissolved gases provides the most valuable information about the health of the transformer. Looking for tends by comparing information from several dissolved gas analyses is a most important transformer diagnostic tool. Furans are a family of organic componds which are formed by degradation of paper insulation. Overheating, oxidation and degradation by high moisture content contribute to the destruction of insulation and form furanic compounds. Changes in furans between dissolve gas analysis tests are more important than individual numbers. To learn more about transformer maintenance, you should visit;

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