It is generally accepted that the degree of paper insulation degradation or ageing correlates with a transformer’s useful or end-of-life determination, and having an understanding or clear picture of the chemical, physical, and electrical condition of the
insulation system is essential to effectively managing its operation. In the last decade, research at Hydro Quebec found that methanol offered the greatest potential in the ageing measurement of oil-impregnated insulation in power transformers. They demonstrated the link between the generation of methanol in oil and the degradation process of the paper.
- Methanol correlates as an early-stage paper degradation marker
- Combined with a furan analysis, the combination of the two approaches can offer a better assessment across the entire lifespan of the insulation.
- Methanol testing can be used with both Kraft and Thermally Upgraded Kraft (TUK) solid insulation in electrical equipment systems.
- Current GC-Headspace technology utilized at Weidmann requires a small liquid sample (approx. 20 mls.) and offers the detection and reporting of methanol and ethanol at low part-per-billion levels
- Allows for the early detection of cellulose degradation markers and the full-life assessment of solid insulation