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Subject: search.filters.subject.Dissolved gas analysis

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    The Comparison of DGA Interpretation Techniques Application for Actual Failure Transformer Inspections Including Experience from Power Plants in Thailand
    (2022-03-01)
    Jongvilaikasem, Korraya
    ;
    Pattanadech, Norasage
    ;
    Wattakapaiboon, Wilasinee
    ;
    Kando, Masaaki
    ;
    Maneerot, Sakda
    Dissolve gas analysis (DGA) is a diagnostic test technique applied for transformer condition evaluation. The interpretation of the dissolved gas results is a significant procedure to classify the incipient fault types in transformers. A variety of dissolved gas interpretation methods utilized for the same investigation case may give different fault type results. This paper investigates the performance of dissolved gas interpretation methods, including Doernenburg Ratio, Roger Ratio, IEC Ratio, Müller-Schlliesing and Soldner Method, Duval Triangle, and Duval Pentagon. The twenty-four failure transformer cases are used to evaluate the performance of the dissolved gas interpretation methods. The test result shows that the Duval pentagon interpretation technique shows the highest consistency interpretation. Besides, the Duval pentagon method demonstrates the ability to identify a normal aging problem of the transformer insulation.
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    Dissolved gas analysis caused by electrical breakdown of liquid impregnated pressboards
    (2019-07-01)
    Pattanadech, Norasage
    ;
    Luk-In, Kanchanaporn
    ;
    Samerpak, Chantapapa
    ;
    Chumninuan, Nattakrit
    ;
    Piyapatamin, Nadpakul
    The aim of this paper is to analyze the dissolved gases in dielectric liquid caused by electrical breakdown of liquid-impregnated pressboards. The pressboards were prepared with dimension of 100 x 100 x 3.2 mm (W x L x H). First of all, each liquid insulation, mineral oil and natural ester (FR3), was heated at 60°C with 200 mbar for 12 hours. Second, pressboards were heated at 80°C with 200 mbar for 12 hours. Then the heated pressboards were impregnated with the dielectric liquid at 60°C with 200 mbar for 12 hours. The impregnated pressboards were divided into three groups. The first group was tested with AC voltage. The second and third group was tested with positive and negative lightning impulse voltages respectively. From the test results, the type and quantity of generated gases caused by breakdown phenomena is dependent on the type and the number of breakdowns.
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    The conformity of DGA interpretation techniques: Experience from transformer 132 units
    (2019-06-01)
    Pattanadech, Norasage
    ;
    Sasomponsawatline, Kantitat
    ;
    Siriworachanyadee, Jompatara
    ;
    Angsusatra, Worawich
    Dissolved gas analysis (DGA) is an important method and widely used for assessment the conditions of transformer insulations. The dissolved gas interpretation is one of the most significant procedures to identify the failure causes. The objective of this paper is to represent diagnosis of the dissolved gas techniques i.e. IEC ratio, Duval Triangle and Duval Pentagon for interpretation. The data of dissolved gas is received from Metropolitan Electricity Authority (MEA), Thailand during 2016. The DGA test results obtained from 132 transformer units. Due to the transformers have various rated power so providers have made a classification of results by rated transformer power rated of 40, 60, 250 and 300 MVA respectively. Overheating at high temperature is generally found. The results of the data analysis by using Duval Triangle method is the most similar result from observation work. Moreover, the Duval Pentagon method is interested for gas interpretation. However, it needs more research work to guarantee and support this method.