Proceedings of the Korean Institute of Information and Commucation Sciences Conference (한국정보통신학회:학술대회논문집)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Transient Impedance Characteristics of Grounding Rods

봉상접지극의 과도임피던스 특성

  • 김일권 (한국해양대학교 전기시스템공학과) ;
  • 김점식 (한국해양대학교 전기시스템공학과) ;
  • 송재용 (한국해양대학교 전기시스템공학과) ;
  • 길경석 (한국해양대학교 전기시스템공학과)
  • Published : 2000.10.01
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Abstract

This paper describes the experimental results of a transient impedance characteristics of grounding rods to a square pulse and standard lightning impulse current. The test were performed on single grounding rod($\phi$ 10mm, 1m) and triple-grounding rods( $\phi$ 10mm, 1m) of equilateral triangles with 5m spacing. For measurements of transient impedance, a pulse generator which can produce square wave of 30ns rise time and 20U Pulse duration was designed and fabricated. In the experiment, transient impedance of the grounding systems have been investigated from the recorded potential and current waveforms. The results showed that the value of the transient impedance is quite higher than the stationary resistance, and provide useful information for the value of a grounding system considered transient characteristics under a high frequency condition such as lightning stokes and ground-fault.

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