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.
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.
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Oil Sampling Guide
How to sample transformer oil for DGA correctly — methods, best practices and common errors.
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DGA Glossary
60+ essential dissolved gas analysis terms explained for engineers and asset managers.
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