• Recognition of combined defects with high-temperature overheating based on the dissolved gas analysis

    • Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      Dissolved gas analysis (DGA); combined defects; defect nomograms; defect development; recognition reliability.

    • Abstract


      The paper presents the results of a complex analysis of gas content in 259 high-voltage transformers, in which overheating with temperatures above 700°C accompanied by discharges with different intensity, were detected. To increase the recognition reliability, ranges of gas percentage and gas ratio values have been determined and 15 nomograms corresponding to the high-temperature overheating, which were accompanied by discharges with different intensity, have been drawn. The analysis of the values of pair correlation coefficients between the concentrations of gases dissolved in transformer oil has been performed. The dynamics of nomogram changes during the development of combined defects with a high-temperature overheating has been analysed. The results of comparative analysis of the recognition reliability of hightemperatureoverheating, which are accompanied by discharges with different intensity, using the diagnostic criteria values regulated by current standards and methods of interpretation of the dissolved gas analysis results, are presented.

    • Author Affiliations



      1. Department of Electric Power Transmission, Institute of Education and Science in Power Engineering, Electronics and Electromechanics, National Technical University Kharkiv Polytechnic Institute, Kharkiv, Ukraine
    • Dates

  • Sadhana | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2023-2024 Indian Academy of Sciences, Bengaluru.