Methanol Marker for the Detection of Insulating Paper Degradation in Transformer Insulating Oil
| Autor: | Steve Duchesne, Oscar H. Arroyo-Fernandez, Brigitte Morin, Esperanza Rodriguez-Celis, Jocelyn Jalbert |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Control and Optimization
Materials science Transformer oil Electrical insulation paper Energy Engineering and Power Technology 02 engineering and technology mechanical properties Distribution transformer lcsh:Technology 01 natural sciences law.invention chemistry.chemical_compound cellulose degradation law 0103 physical sciences medicine Flame ionization detector Electrical and Electronic Engineering Mineral oil Process engineering Transformer Engineering (miscellaneous) methanol insulating oil postmortem 010302 applied physics lcsh:T Renewable Energy Sustainability and the Environment business.industry transformers 021001 nanoscience & nanotechnology chemistry kinetics Gas chromatography Methanol 0210 nano-technology business Energy (miscellaneous) medicine.drug |
| Zdroj: | Energies, Vol 12, Iss 20, p 3969 (2019) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en12203969 |
| Popis: | This manuscript presents a comprehensive literature review with the aim to provide readers a reference document with up-to-date information on the field of methanol use as a chemical marker. It has been a little more than a decade since methanol was first introduced as a marker for assessing solid insulation condition in power transformers. It all started when methanol was identified in the laboratory during thermal ageing tests carried out with oil-immersed insulating papers and was subsequently also identified in transformer field samples. The first publication on the subject was released in 2007 by our research group. This review covers the methanol fundamentals such as the analytical methods for its determination in transformer oil, which is generally performed by headspace gas chromatography with mass spectrometry or flame ionization as a detector. Current standardization efforts for its determination include ASTM working group 30948 and IEC TC10. Kinetic studies have confirmed the relationship between methanol generation, the number of broken 1,4-β-glycosidic bonds of cellulose and changes in mechanical properties. Laboratory tests have confirmed its stability at different accelerated ageing temperatures. Several utilities have identified methanol during field measurements, case studies on power and some distribution transformers are presented, as well as transformer postmortem investigations. These field-testing results demonstrate its utility in monitoring cellulosic insulation degradation. Recently, a model of methanol interpretation has become available that allows for evaluation of the average degree of polymerization of core type transformer cellulose winding. Methanol has a role as an indicator of cellulosic solid insulation ageing in transformer mineral oil, and it is expected that in the future it will be in routine use by utilities. |
| Databáze: | OpenAIRE |
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