Can anyone let me know the reason for inconsistency results of break down voltage BDV of the transformer oil (Reverse trend i.e low BDV and Low Mositure)?
Cold you present the data (Weibull plots) and the electorde arrangement?
The bdv of transformer oil depends on factors such as : electrode geometry, surface condition of the electrodes, particles & moisture content in the oil, the duration between successive bdv tests , stillness of the oil, and cleanliness of the cell. The recent research points out that bdv test to assess the quality of transformer oil only provides the level of particles or impurities in the oil, never a true measure of its intrinsic strength. It is only a mere superficial and elementary test. Partial discharge tests on oil provides a better understanding of the oil quality . BDV always is a statistical phenomenon which can be easily done in the field . One cannot conclude anything better than saying good oil or bad oil based on bdv tests . Quality assessment beyond this is not often made with bdv test alone . ..
Please check the electrodes surface and do electrode buffing
after test the BDV of the oil.
once the electrode loses its smoothness .BDV may vary.Make sure that oil should be in good quality.measure the moisture and particle count present in the oil before testing the BDV of the oil;Normally moisture should be less than 10 ppm if its good oil and particle count will be like less than 8NAS.
BDV may vary due to, surface finishing of the electrode, during BDV test carbonizing on the surface so that effective distance may reduce, air traps/bubbles present (may not be visible) ..........
- Badges
- Science topic
- Similar topics
- Engineering
- Petroleum Engineering
- Oil