Furanic Compounds (FUR)
Standard Test Method for Furanic Compounds in Electrical Insulating Liquids by High Performance Liquid Chromatography (HPLC), ASTM D5837
Analysis for furanic compounds (2-furaldehyde and several derivatives) in oil is a test of chemical properties. Furanic compounds are typically only present in oil as a result of paper degradation. It is an optional test of the composition of new oil. On rare occasions, furanic compounds may be present in new oil as a result of the refining process. Since furanic compounds analysis is a diagnostic test for degradation of the solid insulation, new oil should have a negligible furanic compound content. New oil in a new transformer should be baseline tested and should have less than 20 ppb (μg/kg) of furanic compounds. Any increase in furanic compounds content, and particularly the presence of any furanic compound other than 2-furaldehyde, is an indication that the paper is being damaged by heat, moisture, electrical stress, or oxidation.
Analysis for furanic compounds (2-furaldehyde and several derivatives) in oil is a test of chemical properties. Furanic compounds are typically only present in oil as a result of paper degradation. It is an optional test of the composition of new oil. On rare occasions, furanic compounds may be present in new oil as a result of the refining process. Since furanic compounds analysis is a diagnostic test for degradation of the solid insulation, new oil should have a negligible furanic compound content. New oil in a new transformer should be baseline tested and should have less than 20 ppb (μg/kg) of furanic compounds. Any increase in furanic compounds content, and particularly the presence of any furanic compound other than 2-furaldehyde, is an indication that the paper is being damaged by heat, moisture, electrical stress, or oxidation.