Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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An Analysis of the Ground Surface Potential Rise and Hazardous Voltages Caused by Impulse Currents

임펄스전류에 의한 대지표면전위상승 및 위험전압의 분석

  • 이복희 (인하대학교 IT공대 전기공학부) ;
  • 이규선 (인하대학교 IT공대 대학원 전기공학부) ;
  • 최종혁 (인하대학교 IT공대 대학원 전기공학부) ;
  • 성창훈 (인하대학교 대학원 전기공학과)
  • Received : 2011.02.10
  • Accepted : 2011.03.10
  • Published : 2011.04.30
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Abstract

Lightning and switching surges propagating through the grounding conductors lead to transient overvoltages, and electronic circuits in information technology systems are very susceptible to damage or malfunction from the electrical surges. Surge damages or malfunctions of electrical and electronic equipment may be caused by potential rises. To solve these problems, it is very important to evaluate the ground surface potential rises and hazardous voltages such as touch and step voltages at or near the grounding systems energized by electrical surges. In this paper, the performance of grounding systems against the surge current containing high frequency components on the basis of the actual-sized tests is presented. The ground surface potential rises and hazardous voltages depending on impulse currents for vertical or horizontal grounding electrodes are measured and analyzed. Also the touch and step voltages caused by the impulse currents are investigated. As a result, the ground surface potential rises, the touch and step voltages near the grounding electrodes are raised and the conventional grounding impedances are increased as the front time of the injected impulse currents is getting faster.

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References

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