Examining acceptable Dissolved Gas Analysis level of in-service transformers

D Zhou, N Azis, G Y Yang, Z D Wang, D Jones, B Wells, G M Wallwork

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    Dissolved Gas Analysis ({DGA}) is widely accepted as the most reliable tool for the detection of incipient faults in oil-immersed transformers. Currently there are several standards/guidelines such as {IEC} 60599, {IEEE} C57.104 and {CIGRE} 296 which are available to aid the interpretation of {DGA} test results. According to these standards, there are several methods that can be used to diagnose types of fault in transformers such as Rogers ratio and Duval Triangle. In particular, {IEC} 60599 and {CIGRE} 296 have suggested the usage of 90 \% typical values for diagnosis. Since 90 \% typical values vary with the load, type of transformer and climate, utilities are encouraged to calculate their own 90 \% typical values. In this paper, the 90 \% typical values of distribution transformers for different age intervals and manufacturer groups are calculated and the results shown that in general 90 \% typical values increase with age, different manufacturers' transformers have given different 90 \% typical values. Besides, a comparison between different gas extraction methods is carried out and its impact on 90 \% typical values is identified. There is a difference of 90\% typical values for different gas extraction methods.
    Original languageEnglish
    Title of host publicationHigh Voltage Engineering and Application (ICHVE), 2012 International Conference on
    Number of pages5
    Publication statusPublished - 2012


    • {CIGRE} 296
    • Conferences
    • Databases
    • dissolved gas analysis
    • distribution transformers
    • Duval triangle
    • fault diagnosis
    • Gases
    • gas extraction
    • {IEC} 60599
    • {IEC} standards
    • {IEEE} C57.104
    • {IEEE} standards
    • incipient fault detection
    • in-service transformers
    • oil-immersed transformers
    • Oil insulation
    • power transformers
    • Rogers ratio
    • transformer fault
    • transformer oil


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