Results 141 to 150 of about 140,545 (203)
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Ground potential rise of multi-grounded neutral and shield wires in joint systems
Electric Power Systems Research, 2010Power line faults create the ground potential rise (GPR) on both the neutral and shield conductors when the transmission lines (TL) and distribution lines (DL) are built on the same structures. The durations and magnitudes of resulting GPRs are unique for DL faults and TL faults because the corresponding fault currents are significantly different in ...
Janak Acharya, Wilsun Xu
exaly +2 more sources
Electric power systems research, 2019 Wind turbines are very vulnerable to lightning strikes due to their height, sharp edges and remote locations often with high soil resistivity. In this paper we present numerical simulations of the impedance of a typical wind turbine grounding geometry. We analyze the influence of interconnecting grounding systems of different wind turbines. IEC TR61400-
Poljak, Dragan, Šunjerga, Antonio
core +4 more sources
Step and Touch Voltages and Grounding Potential Rise (IEEE and IEC)
, 2018 This chapter contains safety criteria according to IEEE Standards, step and touch voltage criteria, reduction factor, simplified equations for mesh and step voltage, application of step and mesh potential in safe earthing system design, safety criteria, IEC 479-1 STD, permissible touch and step voltage according to IEC 479-1, Optimum Compression Ratio (
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Frequency Dependence of Multilayer Soil Electrical Parameters: Effects on Ground Potential Rise [PDF]
2021 35th International Conference on Lightning Protection (ICLP) and XVI International Symposium on Lightning Protection (SIPDA), 2021 The paper presents a comprehensive study on the effect of frequency dependence of multilayer soil electrical parameters (SEPs) on ground potential rise (GPR). The lightning current has a large effect on the GPR.
Mohammad Ghomi +2 more
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Analysis and Mitigation of Ground Grid Lightning Potential Rise
Transactions on Electrical and Electronic Materials, 2020Grid design depends mainly on bringing grounding resistance, mesh voltage, and step voltage below tolerable limits when subjected to any ground fault. But, it should be noticed that the grid performance has to be tested when subjected to lightning stroke. The performance of the grid under impulse current differs than that of under power–frequency fault.
Ahmed Taher +3 more
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Ground Potential Rise in Wind Farms due to Direct Lightning
Electric Power Systems Research, 2021Abstract This paper investigates the ground potential rise (GPR) developed in wind farms subject to direct lightning currents representative of first and subsequent negative downward strokes and return strokes associated with upward negative flashes.
Rafael Alipio +4 more
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The Impact of Multilayer Ground and Buried Conductors on Ground Potential Rising
Civil-Comp Proceedings, 2016The electromagnetic modelling of phase-to-ground short-circuits in a railway environment is essential to optimize the protections against ground potential rising. Two particularly important points are defined: a) the determination of the ground structure in terms of its electric resistivity; b) the introduction in the model of a buried conductor in the
Papaiz Garbini, Gabriel +4 more
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Maximum Limit of Allowable Ground Potential Rise of Substation Grounding System
IEEE Transactions on Industry Applications, 2015Substation grounding systems should guarantee the safety of equipment and human beings. This paper discusses the maximum ground potential rise (GPR) of substation grounding systems resulting from short-circuit ground faults, the potential difference on the insulations of secondary cables and devices, and the relationship between the potential ...
Jinliang He, Bo Zhang, Rong Zeng
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A Practical Ground Potential Rise Prediction Technique for Power Stations
IEEE Transactions on Power Apparatus and Systems, 1980The determination of fault-produced Ground Potential Rise (GPR) at a power station has historically posed a number of practical and technical problems. This paper presents a GPR prediction technique which overcomes these problems without requiring a staged fault test.
F. Zupa, J. Laidig
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