Dissolved Gas Analysis (DGA) for Power Transformers

Vaisala's real-time online DGA monitors help mitigate the risks and safeguard the power industry's critical assets.


Gas monitors for Dissolved Gas Analysis

Utilities and industrial clients can now safely increase equipment performance, prolong lifespans, plan for timely maintenance, and prevent unexpected outages. 

Dissolved gases appearing in transformer oil indicate a fault, while the rate of change in gas concentrations is used to determine the severity of the fault.

A multi-gas DGA monitor, like the Optimus DGA monitor, is your best choice for critical transformers, as it provides a comprehensive understanding of the transformer's condition. On the other hand, a single-gas monitor, such as the MHT410, can be used as a simple early warning indicator.

Total gas pressure

Maximize your power transformer's operational life

Total gas pressure is a groundbreaking method for detecting air leaks into your transformer. It's a robust, reliable, and intuitive method to ensure your transformer is still sealed against ambient air and its oxygen.

Oxygen will prematurely age and weaken the paper in your transformer's windings, potentially shortening your transformer's operational life by years. Total gas pressure is the answer. And comes as standard in the Vaisala Optimus™️ OPT100 online DGA monitor.

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Maintenance-Free Total Cost Savings with the Optimus™️ DGA Online Monitor

You get maintenance-free monitoring with the Vaisala Optimus™ DGA – no consumables, mechanicals or need for calibration. Compared to traditional DGA monitors, the Optimus offers real-time monitoring with no false alarms, no maintenance – and no extra lifetime costs.

By providing reliable trend data in real time and without false alarms, Vaisala DGA Monitors help you detect upstream problems.

Dissolved Gas Analysis (DGA) product highlights

Vaisala’s Optimus™ DGA Monitor OPT100 for advanced dissolved gas analysis with total gas pressure method, detecting air leaks in transformers.

Optimus™ DGA Monitor OPT100

Ensure your power transformer stays operational longer. OPT100 brings unmatched long-term stability, reliability and measurement performance for detecting the formation of fault gases.

MMP8 head & body

Moisture in oil probe MMP8

Smart and robust. That’s Vaisala MMP8. Powered by the Vaisala HUMICAP® sensor technology, it has become a virtual standard in its field.

DPT145 Multiparameter Transmitter for SF6 Gas

Multiparameter Transmitter DPT145

Our uniquely capable Multiparameter Transmitter for SF6 gas opens for you the world of online measurement of dew point, pressure, and temperature. It also calculates four other values, including SF6 density. 

Insights, webinars and more


Practicalities of measuring moisture in transformers online

Vaisala's Senja Leivo and Riku Rantala go head to head to discuss practicalities and real-life lessons learned, and tackle audience questions sent in before and during the webinar.

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Moisture in Transformers Q&A eBook

Filled with your actual questions answered by Vaisala's experts, this nearly 40-page eBook is a versatile manual for anyone whose business it is to maintain guard against and understand the effects of moisture in power transformers.

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Online DGA Monitoring of Power Transformers

Find the fundamentals of dissolved gas analysis for power transformers and get to know the data from field tests of Vaisala online monitors.
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Discover four core strategies to improve your power transformers' lifespan

Download this eBook and arm yourself with practical and scientific knowledge. Learn how you can protect your high-voltage assets and improve your operations through online DGA monitoring, and take better-informed decisions, on-time and on budget.

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The science of moisture in transformers

In four episodes, you'll get a deep dive into both the science and practice of moisture in oil and measuring it, culminating in a two Expert Q&A sessions with your insights & questions answered by the experts.

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Infrared DGA and aging oils – possible without recalibration?

Infrared technologies, whether PAS or NDIR, are a great option for DGA monitoring. Infrared also makes it possible to create a maintenance-free DGA monitor that does not need any recalibration — if you can solve the challenge of oil aging.

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Customer case

Using online DGA to safeguard a transformer's end-of-life operation

The following case study explores the detection of severe faults and the overall monitoring process and procedure during an old transformer's final months in service - it's end-of-life (EOL). 

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Power transformer monitoring made airtight – Total Gas Pressure

Ever-increasing efficiency targets concern all industries and their assets. Power transformers are no different. Maximizing and extending their lifetime is all about meeting this challenge.

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