Dealing with Uncertainty for Dissolved Gas Analysis

  • W. H. Tang
  • Q. H. Wu
Part of the Power Systems book series (POWSYS)


This chapter presents three approaches to tackling uncertainties occurring in transformer condition assessment, including the ER approach, the hybrid FL and ER approach and the BN approach. Firstly, the methodology of transferring a transformer condition assessment problem into an MADM solution under an ER framework is presented. Three examples for performing transformer condition assessment, using the ER approach, are then illustrated highlighting the potential of the ER approach. The second part of this chapter employs a hybrid approach to the analysis of DGA data based upon several traditional DGA methods. Ideas adapted from the FL theory are applied to soften fault decision boundaries used by the traditional DGA methods. These diagnoses are then considered as pieces of evidence ascertaining to conditions of transformers, which are aggregated using an ER algorithm. The third part is concerned with a BN approach to processing dissolved gases. The methodology of mapping the knowledge in the DGA domain into a BN is described. Finally, an applicable solution to tackle the cases which are not identifiable by the IEEE and IEC code scheme is discussed using the BN approach.


Fault Diagnosis Fault Type Preference Degree Basic Probability Assignment Transformer Fault 
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Copyright information

© Springer-Verlag London Limited  2011

Authors and Affiliations

  1. 1.Department of Electrical Engineering and ElectronicsThe University of LiverpoolLiverpoolUK

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