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Transformer oil chromatography (Dissolved Gas Analysis, DGA) is an advanced chromatographic technique for qualitative and quantitative detection of chemical components in transformer oil. It is widely used to assess transformer health, diagnose potential faults (e.g., partial discharge, overheating, arcing), and optimize maintenance strategies, ensuring grid reliability and preventing unplanned outages.
Detects 7 critical gases (H2, CH4, C2H2, C2H4, C2H6, CO, CO2) as per IEEE C57.104 & IEC 60599 standards.
Covers all key fault characteristic gases for accurate transformer condition assessment.
Built-in IEC 60599 ratio methods (e.g., Rogers, Doernenburg) to automatically classify faults:
Partial discharge (PD)
Thermal faults (low/high temperature)
Electrical arcing
Generates instant diagnostic reports with actionable insights.
24/7 continuous sampling eliminates manual testing delays.
Cloud/local data integration for remote monitoring via SCADA/EMS systems.
Multi-level alarms (SMS, email, platform alerts) for gas threshold breaches or abnormal trends.
| Serial Number | Monitoring gas | Measurement range | Minimum detection |
| 1 | H2 | 1 ~ 2000 μl/l | 1 μl/l |
| 2 | CO,CO2 | 1 ~ 5000 μl/l | 5 μl/l |
| 3 | CH4 | 0.1 ~ 2000 μl/l | 0.1~0.5 μl/l |
| 4 | C2H4 | 0.1 ~ 2000 μl/l | 0.1~0.5 μl/l |
| 5 | C2H6 | 0.1 ~ 2000 μl/l | 0.1~0.5 μl/l |
| 6 | C2H2 | 0.1 ~ 500 μl/l | 0.1~0.5 μl/l |
Answer: Transformer Oil Chromatography, or Dissolved Gas Analysis (DGA), is a diagnostic technique that detects and measures dissolved gases (e.g., H2, CH4, C2H2) in transformer oil. It helps identify faults like overheating, partial discharge, or arcing before they cause equipment failure.
Answer: Standard DGA detects 7 key gases:
Hydrogen (H2) - Partial discharge
Methane (CH4), Ethane (C2H6), Ethylene (C2H4) - Thermal faults
Acetylene (C2H2) - Arcing
Carbon Monoxide (CO), Carbon Dioxide (CO2) - Insulation degradation
Answer: DGA uses gas concentration ratios (per IEC 60599 or IEEE C57.104) to classify faults:
Rogers Ratio Method - Thermal vs. electrical faults
Duval Triangle - Pinpoints fault type (PD, arcing, overheating)
Key Gas Method - Identifies dominant gas patterns
Answer:
| Online DGA | Lab Testing |
|---|---|
| Real-time data, 24/7 monitoring | Delayed results (days/weeks) |
| Automated alerts for faults | Manual sampling required |
| Reduces unplanned outages | Risk of missing sudden faults |
Answer:
IEC 60599 - International standard for DGA interpretation
IEEE C57.104 - Guides for gas limits and fault types
ASTM D3612 - Lab testing procedures
Answer:
Healthy transformers: Annually
Aging transformers: Every 6 months
Critical units: Continuous online monitoring
Answer: C2H2 > 1 ppm suggests electrical arcing, a severe fault requiring immediate inspection.
Answer: Yes! By tracking gas trends (e.g., rising H2 + C2H2), DGA provides early warnings for:
Insulation breakdown
Overloaded windings
Bushing/cooling system leaks
Answer:
Portable DGA analyzers (for field tests)
Online DGA monitors (for real-time tracking)
Gas chromatographs (lab-grade precision)
Answer: Many transformer manufacturers, utilities, and labs offer DGA services. For on-site testing, consider portable units like the LumaSense DGA900 or Qualitrol DGA monitors.
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