Expert Tribology Consultancy
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Dissolved gas analysis for power transformer fault diagnosis based on IEEE's published methods
All seven Duval Triangle variants, five mineral-oil Pentagon variants, including the arcing-in-paper and arcing-in-oil sub-zones (D1-P/D1-H, D2-P/D2-H) published by Duval & Buchacz in 2022, three ester Pentagons (3, 4 and 4b), and IEC 60599 three-ratio analysis. No registration and no charge.
Screening indication in seconds
Triangle 1 as published in IEEE Std C57.104-2019, plus the arcing sub-zones proposed by Duval & Buchacz (2022); Pentagons 1 and 2 as published in CIGRE ICTRAM06-2023; ratios per IEC 60599:2022
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50+ years of combined founder expertise
The ultimate diagnostic workspace. Combine Duval Triangles, Pentagons, and Gas Trends in a single interactive session. Compare results, import data, and generate comprehensive insights.
Companion calculators from our Sampling Physics article — see how a few millilitres of headspace can re-zone a DGA result.
Read the articleProperty calculators for lubricant and insulating-fluid work — viscosity index per ASTM D2270 and the ISO 4406 cleanliness code.
Read the articleWhat does D1-H, S or C2 mean? Look it up in the fault code library.
Older DGA interpretation methods that IEEE C57.104-2019 still prints and itself rates down. Kept here for reference and comparison — every result is shown with the standard’s own limitation sentence and published error figure, and none of them enters the dashboard or the comparator.
Not peers of the current methods
Rogers: the standard states it cannot identify faults in typically 35 % of results. Key Gas: typically 50 % inconclusive or wrong when applied by software. Doernenburg: printed in an annex whose header says the content is not part of the standard, with no error rate printed at all. These pages reach no conclusion of their own.
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10–15 working days from sample receipt · urgent analysis by agreement
