Dissolved gas analysis (DGA) in oil-filled transformers [2 days]

The amount of dissolved gas in transformer oil (or other electrical equipment) is the main indicator of electrical or thermal anomalies in the equipment and its accessories. For this reason, dissolved gas analysis (DGA) is one of the most important measures in life cycle management (LCM) of different electrical equipment with insulating fluids.

The reference standard is IEC 60599:2015 “Mineral oil-filled electrical equipment in service – Guidance on the interpretation of dissolved and free gases analysis”. Dissolved gas analysis, or rather correct interpretation of dissolved gas analysis, is able to provide valuable information on the state of health of equipment with insulating oil.Moving from analytical results to useful information and correct maintenance strategy is not easy.

Course participants will be able to benefit from Sea Marconi’s experience; in 2017 alone, our laboratory performed dissolved gas analysis more than 11,400 times (with as many diagnostic interpretations). Furthermore, the dissolved gas test is one of Sea Marconi’s accredited tests, meaning that those tests are subjected to strict controls by an independent third-party body (ACCREDIA), thereby guaranteeing the highest standards of quality in both procedural and purely analytical terms.

This course does not yet have fixed dates.

Contact us and we can arrange one or more dates together

2 days

– Basic transformer concepts and maintenance strategies
– Normative requirements
– Gas formation mechanisms
– Classification of fault types
– Interpretative criteria analysis (Duval Triangle) – IEC 60599
– Interpretative criteria according to IEEE (TDCG, Doernerburg, Rogers)
– Typical concentration values – IEC 60599 and IEEE
– Typical increment rates – IEC 60599 and IEEE
– Characteristic ratios – IEC 60599
– Effects on the insulation system, such as preserving the sealing system
– Interpretation of gas from the Buchholz relay, switches, insulators, etc.
– Degradation of Kraft paper and gas formation
– Insulation system ageing factors: oxygen concentration, carbon oxide concentration and temperature
– Preventive maintenance planning
– Gas sampling methods
– Dissolved gas analysis (DGA) – Measurements in laboratory and on-site
– Electrical tests and correlation with gas analysis
– Fault analysis and problem solving
– Expected extension of operating life: degassing, oil regeneration, filtering and dehumidifying of the transformer, continuous On-Line Conditioning
Role of DGA interpretation in corrosion and oxidation mechanisms:
– Oxidation of oil
– Oxidation of paper
– Reaction of corrosive sulfur
– Formation and migration of copper

SHow it is organised.

Practical laboratory session.

– Service providers,
– Utilities engineers,
– Consultants,
– Researchers (in the electrical, environmental and technical fluid fields),
– Maintenance technicians,
– Laboratory technicians and managers

Sea Marconi Campus (via Ungheria 20, Collegno (Turin) – Italy)

This course can also be organised at the customer’s premises

Don’t miss this opportunity!

Training material

At the end of the course, each participant will receive a certificate of attendance.
At the end of the course, each participant will receive a certificate of attendance.


This course is held in Italian, English and French.
The course can be delivered in other languages through an interpreter chosen by Sea Marconi or the customer.


Maina Riccardo

Sea Marconi Laboratory Manager

*The course may be held by other Sea Marconi trainers

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