A medical check-up that can save your transformer life

Did you know there is a diagnostic technique like your medical check-up that is applied to electrical transformers and that can prevent thermal and electrical failures? This technique is known as DGA or Dissolved Gas Analysis.

Jayme Nunes

Senior Technical Advisor, Nynas

Jayme represents Nynas in several international technical committees related to insulating liquids, such as IEEE, ASTM, Cigré, ABNT and ANCE. He joined Nynas in 2007.

Did you know there is a diagnostic technique like your medical check-up that is applied to electrical transformers and that can prevent thermal and electrical failures? This technique is known as DGA or Dissolved Gas Analysis.

DGA takes advantage of the ability of mineral oil to generate specific gases under electrical or thermal stress. Quantifying these gases and identifying the specific gas pattern allows a specialist to detect the kind of failure and the severity assessment as well, still at the incipient stage, when the risk of damage to the equipment is still low. 

The main gases relating to the faults are hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H6) and, if insulating paper is involved, carbon monoxide (CO) and carbon dioxide (CO2) as well. Through these gases, you can identify electrical faults such as partial discharges or electrical arcs, and thermal faults such as hot spots, but how can we relate specific gases to specific faults? This is done by considering the energy involved in the fault and the bond formation energy of the oil molecules, for example: partial discharge is a low-energy fault and the gas-key related to that is the hydrogen, because the partial discharge only has the energy to break the C-H bond and generate H2. In the same way, acetylene (C2H2) is related to electric arc because to form a CΞC bond a lot more energy is needed, and only a power electric arc can do this.

For the hot spots, like a loose connector for example, it is possible estimate the temperature of the faults and therefore the severity. For low temperatures, it is mainly methane and ethane that are formed. As the temperature increases and therefore more energy is involved in the fault, less ethane and more ethylene are formed, indicating that the severity and therefore the risk is increasing, and the time is approaching to reduce the sampling periodicity or even to schedule an internal inspection.

A good analogy for the DGA is your own blood sample test. You can compare your results to the limit values and conclude that all the results conform with to the limits and eventually some of them are out. From the same results, a medical doctor can extract a lot more information, not only about the blood itself but with regard to your general health.

DGA is currently the best monitoring technique for power transformers and is being widely used by utilities and industrial users around the world to check the health of their equipment.  A DGA expert can extract a lot of useful information from an oil sample.

Find out more

If you want to find out more about this, you can consult IEC 60599 - Mineral oil-filled electrical equipment in service - Guidance on the interpretation of dissolved and free gases analysis or IEEE C57.104

IEEE GUIDE for the Interpretation of Gases Generated in Oil-Immersed Transformers

Further reading

How much water is there in my transformer?

Minimising water in a transformer’s insulation system is important as excess water can increase the risk of dielectric failure and can also speed up the ageing of the cellulose based paper insulation.

Extreme tension demands superior oil

What makes an oil suitable for use in ultra-high voltage electrical equipment? Having the superior properties associated with the Super Grade is essential. Jayme Nunes explains why.

Doubling down on CO2

By choosing NYTRO® BIO 300X for their transformers, utilities take steps towards sustainability. Apart from being bio-based, biodegradable, renewable, and recyclable, Nynas’ innovative transformer liquid also offers superior performance, further reducing carbon footprints.

THERE IS MORE TO US THAN THIS

We are delighted you are interested in our products. If you have any questions about our products and services, get in touch with your local Nynas contact. Besides top quality oils, we offer a wide range of services, including rapid delivery worldwide, training, seminars and much more. All you have to do is ask.

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General Manager

Sabine Langmuller

Sabine Langmuller

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Paul Bester

Paul Bester

Channel Manager CEETMEIA

 Sameen Kadli

Sameen Kadli

Customer Service Executive

 Sibala Libish Kumar

Sibala Libish Kumar

Customer Service Executive

 Abigail Waller

Abigail Waller

General Manager / Sales Manager

Farhana Mitha

Farhana Mitha

Sales Executive

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

Marco Roncelli

Marco Roncelli

Sales Executive

 Ilenia Bellotti

Ilenia Bellotti

Customer Service Executive

Daniele Frustagli

General Manager

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

 Ovidiu Nan

Ovidiu Nan

General Manager

Sabine Langmuller

Sabine Langmuller

Customer Service Coordinator

 Ovidiu Nan

Ovidiu Nan

General Manager

Sabine Langmuller

Sabine Langmuller

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

 Myriam Picado

Myriam Picado

General Manager / Sales Manager

 Juan Jiménez

Juan Jiménez

Sales Executive

 Jose Luis Maceda

Jose Luis Maceda

Customer Service Coordinator

 Gloria Villaverde Parrado

Gloria Villaverde Parrado

Customer Service Executive

Maria Jose Municio

Maria Jose Municio

Sales Executive

Maria Jose Municio

Maria Jose Municio

Sales Executive