What Is Dissolved Gas Analysis ?
DGA measures the concentration of key gases such as hydrogen, methane, ethylene, ethane, acetylene, carbon monoxide, and carbon dioxide that dissolve in insulating oil due to transformer aging or fault conditions like arcing, overheating, or partial discharges.
Standards Followed
- IEC 60567: Oil-filled electrical equipment – Sampling and analysis of dissolved gases
- IEC 60599: Interpretation of gas data in transformers
Key Gases Measured
Insulating Liquids – Measurement of Relative Permittivity, Dissipation Factor (Tan δ) and DC Resistivity.
| Gas Name | Symbol | Indicative of |
|---|---|---|
| Hydrogen | H₂ | Partial discharges |
| Methane | CH₄ | Low-temperature overheating |
| Ethylene | C₂H₄ | High-temperature overheating |
| Ethane | C₂H₆ | Thermal fault (mild) |
| Acetylene | C₂H₂ | Arcing or high-energy discharges |
| Carbon Monoxide | CO | Cellulose insulation degradation |
| Carbon Dioxide | CO₂ | Paper insulation aging |
| Oxygen & Nitrogen | O₂/N₂ | Leakage, oxidation, air ingress |
DGA Interpretation Techniques
- Duval Triangle Method
- Key Gas Method
- Ratio Method (Rogers, IEC)
- AI-based fault pattern classification via ERP
- Trending for early degradation detection
Common Faults Detected
- Partial discharges
- Arcing
- Low/High-temperature overheating
- Cellulose (paper) degradation
- Oil oxidation or contamination
- Thermal runaway or hot spots
Our Testing Process
- Vacuum bottle collection with barcode and GPS tagging
- Gas extraction via vacuum stripping (as per IEC 60567)
- Gas Chromatography analysis using calibrated standards
- AI-enhanced diagnosis via ERP system
- Results available on digital dashboard or downloadable PDF
Report Includes
- Concentration of each gas in ppm
- Total Dissolved Combustible Gases (TDCG)
- Fault type classification (e.g., PD, overheating, arcing)
- Severity grading and suggested actions
- Historical trends and Duval Triangle mapping
Why Choose Tru-FIL for DGA Testing?
- IEC 60567 & IEC 60599 compliant methodology
- NABL-grade gas chromatography instruments
- ERP-integrated AI diagnosis engine
- 24/7 lab support with rapid turnaround
- Pan-India vacuum-based sample pickup and tracking
- Digital reporting with QR code validation