• Journal of the Korean Society for Railway
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• v.10 no.6
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• pp.645-649
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• 2007

Ground systems flow fault currents into the ground, and suppress Ground Potential Rise (GPR) by the current. In this paper, we designed and fabricated a surge impedance meter to analyze the ground impedance in wide frequency ranges. The meter consists of a surge generator, a high speed sample/hold (S/H) circuit and an associated electronics. The surge generator produces surge voltage up to 5kV in ranges of $50\sim500ns$. Field tests were carried out to evaluate the surge impedance meter at a driven-rod ground system. The results showed that surge impedance of ground systems should be measured by various fast surge waveforms, since the impedance increases as the rise time of applied voltage increases.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.364-368
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• 2007

현재 일반적으로 서지 발생장치를 이용하여 측정하는 서지임피던스 측정기는 측정시 측정의 경향성 및 재현성이 상당히 불량하여 측정값을 신뢰하기 힘들고 일반적인 접지저항 측정기로는 측정값이 정확하게 측정되지 않는 문제점이 있어 탑각의 누설전류를 이용한 활선철탑 접지저항 측정기에 의한 정확한 접지저항 측정을 하는 것에 이 연구의 목적이 있음