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A single phase transformer equivalent circuit for accurate turn to turn fault modeling

Gholami, M ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1109/IranianCEE.2016.7585591
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2016
  4. Abstract:
  5. Recently, an increasing concern has been raised about turn-to-turn faults (TTFs) in power transformers, because these faults can lead to severe transformer insulation failure and consequently, its outage. Generally, it is impossible to experimentally analyze the transformer behavior under such faults, since the implementation of those experiments may be substantially destructive. Therefore, computer-aided models should be developed to investigate the performance of transformer protective relays under turn-to-turn faults. So far, existing transformer models are mainly formulated to implement in the EMTP-based softwares. However, most of power system protection engineers and researchers develop their protective algorithms in other softwares, such as MATLAB. In this paper, two simplified and accurate equivalent circuits of single phase, two winding transformer (under TTF condition) are proposed. These equivalent circuits can be simply simulated in any desired software. This accurate model closely translates the state-of-art existing TTF models into a comprehensive equivalent circuit. However, precise estimation of its parameters requires a supplementary finite element analysis. This paper employs some justifiable simplifications to the accurate model and results in a simple TTF equivalent circuit. The parameters of this model can be obtained by employing just the transformer routine test datasheet. The simple equivalent circuit is simulated under several turn-to-turn fault conditions and its accuracy has been validated. © 2016 IEEE
  6. Keywords:
  7. Equivalent circuit ; Turn-to-turn fault (TTF) ; Electric equipment protection ; Electric power system protection ; Electric transformer testing ; Finite element method ; MATLAB ; Outages ; Power transformers ; Reconfigurable hardware ; Timing circuits ; Transformer protection ; BCTRAN routine ; Power system protection ; Single-phase transformers ; Transformer insulation ; Transformer modeling ; Transformer models ; Turn-to-turn faults ; Two winding transformer ; Equivalent circuits
  8. Source: 24th Iranian Conference on Electrical Engineering, ICEE 2016, 10 May 2016 through 12 May 2016 ; 2016 , Pages 592-597 ; 9781467387897 (ISBN)
  9. URL: http://ieeexplore.ieee.org/document/7585591