09/02/2026
Does your DGA alarm know what's normal for this transformer?
Static ppm limits treat every like the fleet average, triggering nuisance alerts after commissioning or letting real faults slip through when thresholds are set too high. A baseline-driven strategy computes each transformer's own median and 10th/90th percentiles from 30–90 days of stable data. It is important to learn how to build an online DGA alarm strategy that works.
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