The Transactions of the Korean Institute of Electrical Engineers A (대한전기학회논문지:전력기술부문A)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Improvement of Digital Distance Relaying Algorithm Using Wavelet Transform in Combined Transmission Line

웨이브렛을 이용한 혼합송전선로에서의 거리계전 알고리즘 개선

  • 정채균 (원광대 전기공학과) ;
  • 김경호 (원광대 전기공학과) ;
  • 하체웅 (LG전선 전력연구소) ;
  • 이종범 (원광대 전기전자 및 정보공학부) ;
  • 윤양웅 (원광대 전기전자 및 정보공학부)
  • Published : 2003.10.01
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Abstract

Distance realy is tripped by the line impedance calculated at the relay point. Accordingly the accurate operation depends on the precise calculation of line impedance. Impedance can be accurately calculated in case of overhead line. However, in case of power cables or combined transmission lines, impedance can not be accurately calculated because cable systems have the sheath, grounding resistance, and sheath voltage limiters(SVLs). There are also several grounding systems in cable systems. Therefore, if there is a fault in cable systems, these terms will severely be caused much error to calculation of impedance. Accordingly the proper compensation should be developed for the correct operation of the distance relay. This paper presents the distance calculating algorithm in combined transmission line with power cable using wavelet transform. In order to achieve such purpose, judgement method to discriminate the fault section in both sections was proposed using D1 coefficient summation in db4. And also, error compensation value was proposed for correct calculation of impedance in power cables section.

Keywords

References

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