KIEE International Transactions on Power Engineering

대한전기학회 (The Korean Institute of Electrical Engineers)
권호 표지

Digital Relaying Algorithm for Power Transformer Protection using Fuzzy Logic Approach

  • Park, Chul-Won (Dept. of Electrical Engineering, Wonju National College) ;
  • Shin, Myong-Chul (School of Electrical & Computer Engineering, Sungkyunkwan University)
  • 발행 : 2002.04.01
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초록

Power transformer protective relay should block the tripping during magnetizing inrush and rapidly operate the tripping during internal faults. Recently, the frequency environment of power system has been made more complicated and the quantity of 2nd frequency component in inrush state has been decreased because of the improvement of core steel. And then, traditional approaches will likely be maloperate in the case of magnetizing inrush with low second harmonic component and internal faults with high second harmonic component. This paper proposes a new relaying algorithm to enhance the fault detection sensitivities of conventional techniques by using a fuzzy logic approach. The proposed fuzzy based relaying algorithm consists of flux-differential current derivative curve, harmonic restraint, and percentage differential characteristic curve. The proposed relaying was tested with relaying signals obtained from EMTP simulation package and showed a fast and accurate trip operation.

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참고문헌

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