• Title/Summary/Keyword: electrolytic grounding systems

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The Comparison on Grounding Characteristics for 3 Grounding Systems (3가지 접지방식에 대한 접지특성비교)

  • Shin, Dong-Ho;Kim, Yong;Baek, Soo-Hyun;Lee, Eun-Young;Kim, Pill-Soo;Cho, Dae-Hoon
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.49 no.6
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    • pp.289-297
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    • 2000
  • This paper presents a comparison on the resistance and characteristics of transient response of grounding systems under surge currents using frequency domain electromagnetic field analysis software package and field test. Analysis is done by computer model, based on electromagnetic field theory approach, that accurately takes into account frequency dependent characteristics of the system. The transient performance of three grounding systems is analyzed by comparison of frequency dependent impedance and the maximal transient GPR. A double exponential lighting surge current is injected at one corner of the grounding systems. The transient GPRs a rod grounding systems are higher than mesh or electrolytic grounding systems. Af field test, the results of resistance measurement and time-variant of ground resistance slightly reduce electorlytic grounding systems less than rod and mesh grounding systems.

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A Simulator for Potential Distribution Analysis

  • Kil, Gyung-Suk;Gil, Hyong-Jun;Park, Dae-Won
    • Journal of Electrical Engineering and Technology
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    • v.7 no.2
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    • pp.225-229
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    • 2012
  • This paper proposes a reduced-scale simulator that can replace numerical analytic methods for the estimation of potential distribution caused by ground faults in various grounding systems. The simulator consists of a hemispherical electrolytic tank, a three-dimensional potential probe, a grounding electrode, and a data acquisition module. The potential distribution is measured using a potentiometer with a position-tracing function when a test current flows to the grounding electrode. Using the simulator, we could clearly analyze the potential distribution for a reduced- scale model by one-eightieth of the buried depth and length of the grounding rod and grounding grid. Once both the shape of the grounding electrode and the fault current are known, the actual potential distribution can be estimated.

Research on Protection Method for Ground Electrode of DC Systems from Corrosion (직류 접지극의 전식보호 방법 연구)

  • Jeong, Woo-Yong;Kim, Hyosung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.2
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    • pp.90-95
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    • 2021
  • In contrast to AC grounding systems, the ground electrode in DC systems continuously maintains positive or negative polarity. Ground electrodes with (+) polarity proceeds by oxidation reaction. Thus, the DC current should flow opposite to the polarity of the leakage current flowing through the (+) ground electrode by using a compensation electrode, and the current flowing through the (+) ground electrode can be 0A. However, according to protecting the (+) ground electrode, the compensation electrode corrodes and gets damaged. Thus, the (+) ground electrode must be protected from corrosion, and the service life of the compensation electrode must be extended. As an alternative, the average value of the current flowing through the compensation electrode should be equal with the value of the leakage current flowing through the (+) ground electrode by using the square waveform. Throughout the experiment, the degree of corrosion on the compensation electrode is analyzed by the frequency of the compensation electrode for a certain time. In the experiment, the frequencies of the square waveform are considered for 0.1, 1, 10, 20, 50, 100 Hz, and 1 kHz. Through experiments and analysis, the optimal frequency for reducing the electrolytic damage of the (+) electrode and compensation electrode in an LVDC grounding environment is determined.

Research on Comparison of Individual and Connecting Grounding Electrode for Potential Rise Distribution (개별 접지전극과 연접된 접지전극의 전위상승 분포 비교 연구)

  • Gil, Hyoung-Jun;Choi, Chung-Seog;Lee, Bok-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.2
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    • pp.57-62
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    • 2008
  • This paper deals with a comparison of individual and connecting grounding electrode for potential rise. When a test current flowed through grounding electrode, potential rise was measured and analyzed for grounding method using a electrolytic tank in real time. In order to analyze the potential rise of grounding systems, a hemispherical water tank experimental apparatus was studied. Potential rise was measured and analyzed regarding the grounding method and distance by using this apparatus. The apparatus was composed of a hemispherical water tank, AC power supply, a movable potentiometer, and test grounding electrodes. The potential rise was measured by the horizontal moving probe of the potentiometer. The grounding electrodes were designed and fabricated with ground rods on a scale of one-eightieth. Potential rises of individual grounding electrode were higher than those of connecting grounding electrode. The distributions of surface potential are dependent on the distance from grounding electrode.

Single-Phase Transformerless PV Power Conditioning Systems with Low Leakage Current and Active Power Decoupling Capability

  • Nguyen, Hoang Vu;Park, Do-Hyeon;Lee, Dong-Choon
    • Journal of Power Electronics
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    • v.18 no.4
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    • pp.997-1006
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    • 2018
  • This paper proposes a transformerless photovoltaic (PV) power converter system based on the DC/AC boost inverter, which can solve the leakage current and second-order ripple power issues in single-phase grid-connected PV inverters. In the proposed topology, the leakage current can be decreased remarkably since most of the common-mode currents flow through the output capacitor, by-passing parasitic capacitors, and grounding resistors. In addition, the inherent ripple power component in the single-phase grid inverter can be suppressed without adding any extra components. Therefore, bulky electrolytic capacitors can be replaced by small film capacitors. The effectiveness of the proposed topology has been verified by simulation and experimental results for a 1-kW PV PCS.