Abstract:

The comparative analyses of silicone oil and ester insulating oil in general performance, insulation performance, heat transfer properties, tray gassing performance and oxidation stability was conducted. The results show that compared with silicone oil, ester insulating oil has lower ignition point, larger acid value, higher the dielectric loss factor, larger ECT and lower volume resistivity. As the temperature increases, insulation performance of ester insulating oil drops rapidly, while the silicone oils and ester oils have similar heat transfer performance. The silicone insulating oil has strong anti-lightning breakdown capability, excellent thermal and oxidation stabilities. Tray gassing production of silicone insulating oil is much less than the ester oil.

Key words: passenger transport EMU, traction transformer, insulating oil, insulation performance, oxidation stability