Results 151 to 160 of about 140,545 (203)
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Distribution of Potential Rise as a Function of Shape of Grounding Electrodes
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 2007In order to analyze the potential rise of grounding systems installed in buildings, a hemispherical grounding simulation system was studied. Potential rise was measured and analyzed regarding the shape and distance of the grounding electrodes by using this system.
Hyoung-Jun Gil +2 more
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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 2011
The most important object of grounding systems is to protect human being from electric shock. Touch and step voltages are measured to evaluate the performances of grounding systems. Dangerous voltages have been largely studied by the power frequency fault currents, on the other hand, the ground current containing the high frequency components and surge
Jong-Hyuk Choi +2 more
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The most important object of grounding systems is to protect human being from electric shock. Touch and step voltages are measured to evaluate the performances of grounding systems. Dangerous voltages have been largely studied by the power frequency fault currents, on the other hand, the ground current containing the high frequency components and surge
Jong-Hyuk Choi +2 more
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Transient Ground Potential Rise Impact on Reliability of Sensor and IED
2020 5th Asia Conference on Power and Electrical Engineering (ACPEE), 2020In the smart substation, transient ground potential rise caused by lightning current is one of the main factors that affect the measurement accuracy and reliability of high voltage equipment sensor and IED (Intelligent Electronic Device). The paper established mathematical model for Impulse Generator and analyzes the variation trend of sensor and IED ...
Longlong Li +4 more
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Research on 220kV GIS enclosure circulation and temporary ground potential rise
IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society, 2017Enclosure circulation of Gas Insulated Switchgear (GIS) and Very Fast Transient Overvoltage (VFTO) are harmful to many respects of power system, including system's security, stability and economic. The effective inhibition of GIS enclosure circulation and VFTO has attracted wide attention.
Xinghua Liu +9 more
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A Semicycle of Ground-Potential Rise
IEEE Transactions on Communications, 1972A brief description is presented of why the power utilities need communication during faults. Wire communication channels can supply this need when suitably protected. The maximum groundpotential rise is needed to select protective equipment. How this transient voltage is generated with its wave shape and duration is explained for a single phase-to ...
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Transient Ground Potential Rise in Gas Insulated Substations - Experimental Studies
IEEE Transactions on Power Apparatus and Systems, 1982The very rapid dielectric breakdown of SF6 (eg, during the operation of disconnect switches in gas-insulated substations) generates steep-fronted travelling waves which couple to the exterior enclosure surface at the air/SF6 bushings and cause transient ground potential rise.
N. Fujimoto +3 more
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Potential Rise Characteristics of a Grounding Grid Subjected to Lightning Currents
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 2016This paper presents the results of an investigation into the factors that affect the impulse response of a grounding grid under the passage of lightning currents. We carried out simulations of potential rise of a 10m×10m square grounding grid comprising 4 meshes buried in the soil of about 140Ω․m resistivity.
Jong-Hyuk Choi, Jae-Suk Lee
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Study of the Spread of Potential Rise Between Two Grounding Electrodes
IEEE Transactions on Industry Applications, 2015The groundings of the power distribution, signaling, and power systems of a railway system are individually performed to realize fail safe, and the groundings are often installed in close proximity. Thus, when a grounding electrode is invaded by a lightning current, its ground potential rises together with the potential of the adjacent grounding ...
Kazuo Yamamoto +2 more
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Observation of ground potential rise caused by artificially-triggered lightning
2010 Asia-Pacific International Symposium on Electromagnetic Compatibility, 2010Comparative analysis was made between the ground potential rise resulted from an artificially-triggered flash, the channel base current and close magnetic fields. The results indicated that the current peaks of the two strokes in artificially-triggered flash were 41.6 and 29.6 kA. The inferred currents, based on the close magnetic fields, were about 39.
null Jing Yang +6 more
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Impact of Frequency-Dependent Soil on Transient Ground Potential Rise of Counterpoise Electrodes
2021 14th IEEE International Conference on Industry Applications (INDUSCON), 2021Tower-footing grounding impedance has a fundamental impact on the generated overvoltages in power system when a transmission tower is hit by lightning. In order to compute accurately the tower-footing grounding impedance, the frequency dependence of soil electrical parameters (resistivity ρ g and relative permittivity e r ) must be considered in the ...
Anderson R. J. de Araujo +2 more
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