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Transformer turn-to-turn fault protection based on fault-related incremental currents

Farzin, N ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1109/TPWRD.2019.2893279
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2019
  4. Abstract:
  5. Winding turn-to-turn fault (TTF) is one of the most reported reasons for transformer unplanned outage. If its occurrence is not detected at an early stage, it can develop into a costly phase-to-ground fault. In this paper, a novel algorithm based on the fault-related incremental currents is proposed to detect a low-level transformer TTF. This paper shows that the performance of the proposed method is independent of the transformer operating condition. Therefore, it is reliable even under the presence of power system transients such as the external faults. In addition, the proposed algorithm can be configured uniquely and easily. This feature prevents the algorithm from unnecessary trips. These trips can be considered as the general problem that most of the past presented methods face. The experimental tests used for verification of the algorithm show that, regardless of the transformer winding configuration and its pre-fault operating conditions, the proposed algorithm can accurately detect the TTF, which involves only 1% of the winding turns, in less than one cycle of power frequency. The reliable and secure performance of the proposed algorithm shows that it can be widely used in the advanced numerical relays
  6. Keywords:
  7. Differential relay ; Incipient inter-turn fault ; negative sequence protection ; Electric fault currents ; Electric grounding ; Electric relays ; Electric transformer testing ; Fault detection ; Transformer windings ; Winding ; Inter-turn fault ; Negative sequence protections ; Operating condition ; Phase-to-ground faults ; Power system transients ; Turn-to-turn faults ; Winding configuration ; Transformer protection
  8. Source: IEEE Transactions on Power Delivery ; Volume 34, Issue 2 , 2019 , Pages 700-709 ; 08858977 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/8613917