The complete technical reference for Dissolved Gas Analysis (DGA) — from the fundamentals of fault gas generation to advanced diagnostic methods. Built for transformer asset managers, reliability engineers, and substation maintenance teams.
Built for transformer asset managers, reliability engineers, and substation maintenance teams, the Knowledge Base is organized as self-contained guides — each one pairs a plain-language explanation with the tables and decision rules you apply in the field. New to DGA? Start at DGA Fundamentals. Working from a gas report? Jump straight to Diagnostic Methods or the Duval Triangle guide.
DGA Fundamentals
The 7 key fault gases in transformer oil — how they form, what they mean, and why DGA is the leading transformer diagnostic.
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Diagnostic Methods
Duval Triangle, Duval Pentagon, Rogers Ratios, IEC ratios and the Key Gas method — compared in one reference.
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Fault Types & Gas Signatures
Partial discharge, arcing, thermal faults and cellulose degradation — the DGA gas signatures for every fault.
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Online vs Offline DGA
Detection speed, cost, coverage and maintenance — when each DGA strategy makes sense for your fleet.
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Hydrogen vs Multi-Gas DGA
Hydrogen-only vs multi-gas monitoring: what each detects, what it costs, and how to choose.
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Duval Triangle Method
The Duval Triangle explained step by step with worked examples and gas-ratio interpretation.
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Duval Triangle Calculator
Interactive tool — enter gas concentrations to plot the triangle and diagnose the fault type.
Use tool →