What is furan test transformer?
Furan test is used to determine the life of a transformer and condition of transformer oil in transformer oil. By the Furan analysis, we check the condition of paper in transformer oil. Furan measures the degradation of cellulose paper. The degradation materials produce CO and CO2 gases.
What is furan content in transformer oil?
When a cellulose molecule de-polymerises (breaks into smaller lengths or ring structures), a chemical compound known as a furan is formed. By measuring the quantity and types of furans present in a transformer oil sample, the paper insulation overall DP can be inferred with a high degree of confidence.
What are furans transformer?
This is usually done in transformers aging above 15 years.Furan indicates the compounds of carbon and hydrogen.When the furan count is above 2500ppb, it means the transformer is about to fail.Furan Analysis is important in deciding when to discard a transformer unit or retain.
What tests are done on transformer oil?
Different Kinds of Transformer Oil Testing
- Visual Examination.
- Color Analysis.
- Dielectric Breakdown Voltage (BDV Test)
- Dissolved Gas Analysis (DGA Test)
- Dissolved Metals.
- Flash Point or Fire Point.
- Interfacial Tension.
- Furanic Compound.
Is furan an aromatic compound?
Furan and Furan-Related Compounds. Furan is an aromatic compound with the participation of the oxygen lone pair in the π-electron system to satisfy Hückel’s rule, 4n + 2 (n = 1) electrons. The compound is stable to heating up to about 550°C (depending also on heating time).
What is degree of polymerization in transformer insulating oil?
The degree of polymerization test is done in order to measure precisely the degradation of the paper insulation used in the transformer. Cellulose, which is used as solid transformer insulation, is a linear polymer molecule consisting of hundreds of glucose units.
What do oxidation inhibitors do?
Most mineral oil dielectric fluids contain an added oxidation inhibitor which is a chemical additive that acts as a preservative. The purpose of the inhibitor is to prevent oxygen from reacting with the oil, thus slowing the aging rate of the oil (and also of the solid insulation).
What is DGA test of transformer?
Dissolved gas analysis (DGA) is an examination of electrical transformer oil contaminants. Insulating materials within electrical equipment liberate gases as they slowly break down over time. DGA usually consists of sampling the oil and sending the sample to a laboratory for analysis.
Can a transformer problem be detected without a furan analysis?
Results from the dissolved gas analysis sample, however, did not reveal any irregularities with the transformer. There was no significant increase in any of the gases that would typically confirm a problem. Without the furan analysis, therefore, the problem might have gone undetected until there was a catastrophic in-service failure.
What is the history of furans in Transformers?
The research on furans in transformers started in the 1980s. hyde, 2-acetylfuran, 5-methyl-2-furaldehyde, and 2-furfurol. between the paper and the insulating oil. As a result, their con- mance liquid chromatography. large volume of publications. The ke y points that promoted this when insulation paper degrades [2], [3].
What is furan testing and why is it performed?
Testing is performed for five furans: • 5M2F (5-methyl – 2-furaldehyde)—local, severe overheat. Furan results are used to determine an average expected degree of polymerization for the paper in the equipment.
What is the best test for the life of a transformer?
Furan analysis is very sensitive, as damage to a few grams of paper is noticeable in the transformer oil – even in a large transformer. It is a very significant diagnostic test, and bis generally considered the best test for assessing the life of a transformer.