Presentation Profile
Automated Dielectric Breakdown Testing of Insulating Fluids per ASTM D877 and D1816
Currently Scheduled: 10/15/2025 - 12:50 PM - 1:10 PM
Room: South Lobby
Main Author
Dr. Raj Shah - Koehler Instrument Company
- Angelina Precilla - Koehler Instrument Company
- Lei Andre Delos Reyes - Koehler Instrument Company
- Zachary Slade - Koehler Instrument Company
- Mojan Jafaripour - Koehler Instrument Company
Abstract:
Electrical insulating fluids play a critical role in safeguarding high-voltage equipment by maintaining strong electrical resistance and preventing premature failure. This study presents the application of the Koehler Dielectric Breakdown Tester to assess dielectric strength and detect contamination in insulating oils according to ASTM D877 (disc electrodes) and ASTM D1816 (VDE electrodes). Sample preparation involves cleaning and aligning test electrodes, conditioning the fluid at a controlled ambient temperature (15 °C – 35 °C), and allowing a 10-minute equilibration period in the measuring cell. During testing, the voltage is ramped steadily until dielectric breakdown occurs; the instrument’s integrated LCD display and thermal printer capture real-time voltage curves and average breakdown voltages for each sample. Comparative analyses highlight that synthetic ester-based fluids consistently exhibit higher breakdown voltages, indicating superior insulating performance. Regular dielectric testing enables early detection of oil degradation or contamination, ensuring optimal protection for transformers and other critical components. By automating test cycles and providing precise, reproducible results, the Koehler tester supports industry efforts to extend equipment lifespan and uphold safety standards.
