Transformer Oil – e-lesson #7 – Gassing tendency, stray gassing and DGA
Hosted by: CS Narasimhan / Intermediate level
This lesson provided an overview of gassing tendency, stray gassing, and dissolved gas analysis (DGA) in transformer oil. Gassing tendency refers to how oil absorbs or evolves gases under electrical stress, while stray gassing is gas production from oil interacting with transformer components at high temperatures. DGA analyzes gases produced by thermal and electrical faults to enable early detection. The lesson covered test methods, significance, and interpretation of these phenomena. Factors like oil type, fault energy, and temperature influence the gases formed. DGA interpretation uses techniques like key gas analysis, gas ratios, and dual triangle plotting. Accurate gas analysis and continued advancement in DGA methods are crucial for reliable transformer diagnostics.
The content of this lesson is fully vendor agnostic but it is sponsored by Ergon.
The content of this lesson is fully vendor agnostic but it is sponsored by Ergon.
The lesson is conducted on the Intermediate level and after the live broadcasting, it stays available on demand. It is intended for utility engineers / chemists, transformer and oil manufacturers, students and faculty of educational institutes, oil testing laboratories, utility staff etc.
Learn the following:
- definitions
- test methods
- Significance of data and interpretation for a transformer in operation
Keywords: transformer oil, testing, methods, gassing, DGA
About the author
CS Narasimhan
Dr. Narasimhan is a Ph.D. in Chemistry with over 30 years of experience in Industrial R&D. While working as a technical director in a major oil company manufacturing transformer oils, he led project teams for developing and commercializing mineral oils for EHV applications and ester fluids. He is a member of several IEC and CIGRE committees dealing with transformer oils. He has several publications and patents to his credit.