EPRI Transformer and Switchyard User Group Meeting

EPRI TSUG July 2026
Hilton Boston Park Plaza, Boston, MA
United States
Power Generation and Transmission
-
8:00a - 5:00p

The Transformer and Switchyard Users Group (TSUG) serves as a collaborative platform for nuclear utilities to advance their expertise in operating and maintaining large power transformers and switchyard equipment. The organization brings together utility personnel and industry experts who share operational insights, discuss equipment performance challenges, and guide research priorities through the Electric Power Research Institute (EPRI). At this annual event, members review operational experiences, identifying lessons learned and developing effective solutions for transformer, arrestor, instrument transformer, isophase busduct, and switching equipment challenges.

Vaisala will be demonstrating our solutions for single and multi-gas Dissolved Gas Analysis in the vendor showcase, and our North America team members Courtney Erickson and Lee Doyle will present “Reliable Measurement for Critical Industries: How Vaisala Monitors Transformers with Industry-Leading Technology.”

Xcel Energy improves transformer fault assessments using online DGA monitoring

Explore how Xcel Energy, a prominent utility company, enhances its transformer fault assessment strategies by integrating a mobile online Dissolved Gas Analysis (DGA) monitor alongside traditional offline methods.


This case study highlights Xcel Energy’s experience using the Vaisala OPT100 DGA monitor on a mobile platform to analyze gassing patterns in transformers with abnormal lab-based DGA results.


By combining both methods and additional offline tests, Xcel Energy successfully diagnosed and managed a potentially problematic situation with a faulty transformer.  

The study underscores the synergy of offline and online DGA analysis in making more informed and confident maintenance decisions, improving grid reliability, and optimizing asset management & safety. 

LIFT-OPT100 installed at XCEL
Optimus™ DGA Monitor OPT100 installed at Xcel Energy site in West Texas 
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DGA Calculator on smartphone with text and graphs

Turn your DGA data into Duval Triangles and Pentagon

Visualize the state of your power transformer, with Duval Triangles, Pentagon, and gassing trend graphs. Supports IEC & IEEE standards, as well as data import & export.

Try the DGA Calculator