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A Study on the Developing Method of HIF Monitoring Data using Wavelet Coefficient

웨이브렛 계수를 이용한 고저항 지락고장 감시데이터 산출방법 연구

  • Jung, Young-Beom (Dept. of Power System, KEPCO Research Institute) ;
  • Jung, Yeon-Ha (Dept. of Power System, KEPCO Research Institute) ;
  • Kim, Kil-Sin (Dept. of Power System, KEPCO Research Institute) ;
  • Lee, Byung-Sung (Dept. of Power System, KEPCO Research Institute) ;
  • Bae, Seung-Chul (Dept. of Forensic Science, National Institute of Science Investigation)
  • 정영범 (전력연구원 파워시스템연구소) ;
  • 정연하 (전력연구원 파워시스템연구소) ;
  • 김길신 (전력연구원 파워시스템연구소) ;
  • 이병성 (전력연구원 파워시스템연구소) ;
  • 배승철 (국립과학수사연구원)
  • Received : 2012.11.08
  • Accepted : 2013.01.28
  • Published : 2013.02.01

Abstract

As the increasing HIF(High Impedance Fault) with the arc cannot be easily detected for the low fault current magnitude compared to actual load in distribution line. However, the arcing current shows that the magnitude varies with time and the signal is asymmetric. In addition, discontinuous changes occur at starting point of arc. Considering these characteristics, wavelet transformation of actual current data shows difference between before and after the fault. Althogh raw data(detail coefficient) of wavelet transform may not be directly applied to HIF detection logic in a device, there are several developing methods of HIF monitoring data using the original wavelet coefficients. In this paper, a simple and effective developing methods of HIF monitoring data were analized by using the signal data through an actual HIF experiment to apply them to economic devices. The methods using the sumation of the wavelet coefficient squares in one cycle of the fundamental frequency as the energies of the wavelet coefficeits and the sumation of the absolute values were compared. Besides, the improved method which less occupies H/W resouces and can be applied to field detection devices was proposed. and also Verification of this HIF detection method through field test on distribution system in KEPCO power testing center was performed.

References

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