Expert Tribology Consultancy
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See how a 5 mL air gap (VG) shifts your DGA fingerprint across Duval Triangle 1 and Pentagon Unified zones. Each gas has its own Ostwald coefficient, so the same VG removes a different fraction of each gas — that asymmetry is what pushes a fingerprint across a zone boundary.
If you haven't seen the bottle animation yet, start with the single-gas calculator.
The fault fingerprints in the selector are illustrative gas compositions, not field measurements. PD, D1, D2, T1, T2 and T3 are constructed to fall in the matching case of IEC 60599:2022 Table 1 and the matching zone of Duval Triangle 1 (Figure B.3). S and C have no case in Table 1 and no zone in Triangle 1, so they are constructed to fall in the matching zones of the Unified Pentagon.
The tools are calculation tools made available free of charge by TriboTech ApS as part of the professional communication of its engineering consultancy. The tools perform a calculation based on the values entered and the published methods identified. They do not constitute an examination of an asset, a diagnosis, or advice on any specific asset. The tools have no knowledge of the asset's design, history, loading or operating conditions, and a result cannot therefore serve on its own as the basis for a technical or operational decision. A result is an indication, not a diagnosis. Use of the tools does not create a client relationship and does not create an advisory relationship. TriboTech ApS provides advisory services only under a concluded framework agreement, and no advisory liability is assumed for the use of results from the tools outside such an agreement. Any decision taken on the basis of a result — including a decision not to act — is taken by the user on the user's own professional judgement and at the user's own risk. As CIGRE itself puts it: "Actual actions on the equipment are the sole responsibility of engineers in charge of the transformers" (CIGRE Technical Brochure 771, 2019, section C.8, printed page 54). Each tool states which published methods and which editions the calculation is based on. The standard itself is the authoritative source, and a standard may have been revised since the edition a tool uses.
Method implementation — The calculation behind this tool is versioned. When a correction changes the result the tool gives for the same input, the version below changes with it. Version 1.1 · 27-09-2026. What changed, and when
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