Original scientific paper

Beyond Fixed Limits Baseline-driven, trend-focused Online DGA alarm strategy Part I

Dr Bhaba P. Das
Marius Grisaru

Abstract

Across the various condition monitoring options available for transformer health, Online Dissolved Gas Analysis (ODGA) has become the go‑to early warning system. Yet too often, alarm logic still relies on static ppm thresholds that ignore a unit’s context, leading to nuisance alarms and operator fatigue. This article presents a practical, standards‑aligned methodology moving from fixed limits to transformer‑specific baselines, population statistics, and noise‑robust Rate‑Of‑Change (ROC) and explains how to cut false positives without compromising sensitivity. It draws on advice from IEC 60599, IEEE c57.104‑2019, CIGRE TB 771 & TB 783, and recent industry experiences.

Keywords

DGA; online DGA; transformer condition monitoring; monitoring systems

Hrčak ID:

347231

URI

https://hrcak.srce.hr/347231

Publication date:

7.5.2026.

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