Journal of Industrial Technology (산업기술연구)

  • Volume 14
  • /
  • Pages.89-100
  • /
  • 1994
  • /
  • 1229-9588(pISSN)
  • /
  • 1598-1371(eISSN)
Kangwon National University, Institute of Industrial Technology (강원대학교 산업기술연구소)
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Danamic Characteristics of Percentage Differential Relays Considering Saturation Effect

포화현상을 고려한 비율차동계전기의 동특성 해석

  • 김남호 (공과대학 전기공학과) ;
  • 김일남 (공과대학 전기공학과 대학원) ;
  • 이준창 (한국전력공사 청평발전소)
  • Published : 1994.10.31
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Abstract

The effects of transient inrush currents on the dynamic characteristics of percentage differential relays are studied when the power transformers are reenergized. An algorithm of estimation the nonlinear magnetic property of power transformer and current trnasformer core are developed. Using this method, we can analyze the effect of inrush currents on the trip region of the percentage differential relays corresponding to the variation of the phase angle and the residual magnetism at the instant of switch closing. Test results are used to verify the availibility of the proposed algorithm. Finally a case study is performed to the 110 MVA main transformer in hydraulic power station.

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