Introduction to DGA Interpretation and Tools
April 30th, 2026
Time: 11:00 AM ET | 10:00 AM CT | 8:00 AM PT
Duration: 60 minutes
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Summary
Understanding dissolved gas analysis (DGA) is essential for assessing transformer health and detecting incipient faults before they lead to costly failures. This webinar provides a high‑level introduction to the principles behind DGA interpretation, including trending analysis and the most common diagnostic frameworks referenced in the industry (such as IEC 60599 and IEEE C57.104). In addition to reviewing foundational concepts, the webinar explores:
- Available analysis and interpretation methods, and how they support condition assessment and early fault detection.
- The range of tools available to support DGA analysis—from traditional ratio‑based methods to the more graphical tool of Duval triangles and pentagons.
- Real-world cases where continuous, online DGA monitoring aided in decision making around transformer maintenance requirements, including when to safely extend operation and when to schedule a replacement.
- The Vaisala DGA Calculator, a free educational tool that helps users practice interpretation techniques, visualize gas development scenarios and better understand industry accepted diagnostic methods. Newly expanded features and support for alternative insulating fluids will also be covered.
Whether you are new to transformer diagnostics or looking to refresh your knowledge, this session offers a clear and accessible introduction to DGA and the tools that help make analysis more intuitive and reliable.
Speakers
Toni Mellin
Application Manager
Vaisala
Application Manager Toni Mellin is an expert in online DGA and continuous online moisture in oil monitoring applications. An active member in CIGRE IEC TC10, MT20 and MT22, working on the IEC standards 60422, 60475, 60567 & 60599, he is also the author and co-author of numerous publications presented at CIGRE and CIRED. Toni has also been deeply involved with the development of prototype DGA monitors which evolved into the groundbreaking Vaisala Optimus™ OPT100.
Andrew Lewis
North America Regional Sales Manager
Vaisala
Andrew Lewis is a Sales Manager with Vaisala’s Power business in the United States, partnering with utilities and industrial customers to improve transformer reliability and reduce costly unplanned outages. Over the past decade in the energy industry, he has led technical sales, program design, and large-scale deployments of emerging and sustainable solutions for global enterprise clients. Andrew holds a B.S. in Mechanical Engineering from the University of Nebraska–Lincoln and previously held leadership roles at Shell and MidAmerican Energy.
