Interpretation of frequency response analysis of power transformer based on evidence theory. Issue 17 (13th August 2019)

• Record Type: Journal Article
• Authors: Shamlou, Alireza; Reza Feyzi, Mohammad; Behjat, Vahid
• Is Part Of: IET generation, transmission & distribution. Volume 13:Issue 17(2019)
• Page Start: 3879
• Page End: 3887
• Publication Date: 2019-08-13
• Subjects: autotransformers -- finite element analysis -- fault diagnosis -- frequency response -- transformer windings; fault detection -- evidence theory method -- frequency response analysis -- power systems -- power transformer structures -- FRA -- mathematical approach -- autotransformer -- finite‐element method -- transformer windings -- apparent power 125.0 MVA -- voltage 230.0 kV -- voltage 132.0 kV -- voltage 20.0 kV; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2019.0320
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Power transformers are one of the key components of power systems. Therefore, they must be operated efficiently to obtain satisfactory system performance, since any distortion or failure in power transformer structures may cause drastic damages. In order to detect deficiencies in power transformers, various methods are utilised. Frequency response analysis (FRA) is one of the most well‐known methods used for fault detection in power transformers. However, the interpretation of FRA results is subjective, and depends primarily on the opinion of a human expert. In other words, there is no comprehensive, accepted and standardised method to interpret FRA results. Subsequently, fault detection based on FRA is prone to error. In this study, a new mathematical approach is used to interpret the frequency response of power transformers based on evidence theory method. This method is more accurate and less computationally burdensome compared to conventional methods. Simulations are implemented on an operating 125 MVA, 230/132/20 kV autotransformer using finite‐element method and the results are compared to the corresponding FRA results of the same autotransformer in order to evaluate the proposed method. The obtained results indicate the efficiency of the proposed method in detecting probable faults of transformer windings through analysing the FRA results.