• Title/Summary/Keyword: Potential interferences coefficients

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Evaluation of Potential Interferences between Grounding Electrodes using an Electrolytic Tank (수조실험장치를 이용한 접지전극 상호간의 전위간섭 평가)

  • Lee, Bok-Hee;Lee, Su-Bong;Lee, Tae-Hyung;Gil, Hyoung-Jun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.4
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    • pp.29-36
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    • 2006
  • This paper deals with the potential interferences between grounding electrodes in various grounding electrodes. The ground potential rise and potential interference coefficients were measured by using and electrolytic tank and calculated by CDEGS program as functions of the configuration and size of grounding electrodes and the distance between grounding electrodes. The ground potential rise and potential interference coefficient strongly depend on the distance between grounding electrodes, the shape and size of grounding electrodes. The potential rise interferences between grounding grid and grounding grid is lower than those between grounding grid and ground rod.

Evaluations on the Potential Interferences between Ground Rods (봉상 접지전극 상호간의 전위간섭에 대한 평가)

  • Lee, Bok-Hee;Lee, Su-Bong;Lee, Tae-Hyung;Jung, Hyun-Uk;Kil, Hyung-Jun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.5
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    • pp.92-98
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    • 2006
  • This paper deals with the potential interferences between ground rods. To propose a method for reducing the potential interference caused by grounding electrodes, the theoretical analysis and the reduced scale model tests, which we related to the measurement and computation of ground potential rise and potential interference caused by actual-sized grounding electrodes where current is injected, were carried out. The ground potential rise and potential interference coefficients were measured by using the hemispherical water tank grounding simulator and calculated by CDEGS software as a function of the distance between grounding electrodes. The ground potential rises and potential interference coefficients strongly depend on the distance between grounding electrodes, and the measured results were compared with the computer calculated data and were known in good agreement.

A Research on the Solution of the Potential Interferences of Isolation Grounding Systems (독립접지방식의 전위간섭 문제 해결을 위한 연구)

  • Lee, Bok-Hee;Lee, Su-Bong;Lee, Tae-Hyung;Kil, Hyung-Jun;Han, Woon-Ki;Kim, Hyo-Jin;Lee, Hyung-Kyon
    • Proceedings of the KIEE Conference
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    • 2005.07e
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    • pp.49-51
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    • 2005
  • This paper presents the potential interferences in various grounding electrode systems. The ground potential rise and potential interference coefficients were calculated as a function of the configuration and size of grounding electrodes and the distance between grounding electrodes. The potential rise and potential interference coefficient strongly depend on the distance between grounding electrodes, the shape and size of grounding electrodes.

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Polymeric Acetate-Selective Electrodes Based on meso-(α,α,α,α)-Tetrakis-[(2-arylphenylurea)phenyl]porphyrins: Electormic and pH Effects

  • Lee, Hyo-Kyoung;Song, Ki-ju;Seo, Hyung-Ran;Jeon, Seung-won
    • Bulletin of the Korean Chemical Society
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    • v.23 no.10
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    • pp.1409-1412
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    • 2002
  • Polymeric membrane electrodes for acetate anion based on meso-(${\alpha}$,${\alpha}$,${\alpha}$,${\alpha}$)-5,10,15,20-tetrakis[2-(penta-fluorophenylurea) phenyl]porphyrin I and similar urea-functionalized porphyrins Ⅱ-Ⅳ as neutral ionophores were prepared. The membrane based on porphyrin I exhibits the best potentiometric properties in pH 6.0 rather than pH 7.0: linear stable response over a wide concentration range (6.0 ${\times}$$10^{-5}$-1.0 ${\times}$$10^{-2}$) with a slope of -59.6 mV/decade and a detection limit of log[CH3CO$O^-$] = -5.32. Selectivity coefficients obtained from the matched potential method (MPM) in pH 6.0 indicate that interferences of hydrophobic anions are very small for the membranes of porphyrins I and II having the strong withdrawing group. The electronic effect of urea-functionalized porphyrins and pH effect of buffer solutions are discussed on the potentiometric response.