Gases disueltos en aceite
Detección de gases en aceite de transformadores para diagnóstico de fallas y mantenimiento predictivo.
When a power transformer's insulating oil and paper degrade due to overheating, partial discharges or internal arcing, they release gases that remain dissolved in the oil: hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide and carbon dioxide. Dissolved gas analysis (DGA) identifies which fault is developing from which gases appear, and the rate of change of the concentrations indicates its severity.
More than half of serious power transformer faults can be detected ahead of time with online monitoring. For the energy industry, that makes DGA the core tool of condition-based maintenance: instead of waiting for laboratory sampling, the transformer is monitored continuously and interventions are planned before a developing fault turns into an unplanned outage.
Typical application areas
- Critical power transformers in transmission substations
- Step-up transformers at generation plants
- Wind and solar farms — remote and offshore sites
- Condition-based maintenance (CBM) programs
- Air leak detection in sealed transformers
- Transformers filled with mineral oils, natural or synthetic esters
- Supervised end-of-life transformer operation
- Distribution transformer fleet monitoring
What makes Vaisala's DGA technology unique
Vaisala approaches online DGA with vacuum gas extraction: an oil sample is degassed in a vacuum chamber, achieving a far more complete extraction than headspace or membrane methods, with results independent of oil type, age and temperature. The gases are measured with in-house-manufactured infrared sensors featuring an integrated vacuum reference and autocalibration, which eliminate drift without factory recalibration. Total gas pressure measurement adds air leak detection without oxygen sensors — the OPT100 monitor combines all of this with no consumables or carrier gases, and the MHT410 transmitter brings the same robustness to direct in-oil hydrogen and moisture measurement.
- Vacuum gas extraction — independent of oil type and age
- In-house infrared sensors with autocalibration: no drift, no recalibration
- No false alarms, no consumables or carrier gases
- Total gas pressure to detect air leaks in sealed transformers
- Hermetically sealed optics, protected from contamination
- IP66 mechanics built to operate from arctic to tropics
AKRIBIS is an authorized Vaisala partner for distribution and technical support in the region — explore the full Vaisala instrumentation line.
Areas where this magnitude is applied
Industries that monitor dissolved gas in oil
More on gases disueltos en aceite
Transformer Summit 2026
A technical gathering on DGA, moisture in oil and transformer asset management, with international experts from Vaisala and the industry.
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The Role of Online DGA Monitoring in Power Transformers
Which fault gases form in insulating oil, why laboratory sampling is only a snapshot, and which criteria drive the choice of an online DGA monitor.
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Using Online DGA to Safeguard a Transformer's End-of-Life Operation
A real case: a 100 MVA transformer from 1958 with recurring gassing, and how hourly monitoring made it possible to decide its removal from service before failure.
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Total Gas Pressure: Air Leak Detection in Power Transformers
Why measuring oxygen alone is not enough to detect air ingress in sealed transformers, and how total gas pressure turns it into a direct reading.
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Infrared DGA and Aging Oils: Possible Without Recalibration?
Why oil aging interferes with infrared fault gas measurement, and how autocalibration compensates for that interference.
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