Results 251 to 260 of about 2,085,793 (277)

Impulse Characteristics of Ground Electrodes in Low Resistivity Soil

IEEJ Transactions on Electrical and Electronic Engineering, 2023
Soil properties have been known to be the factors that influence the ionization process in soil, which cause the impulse impedance, Zimpulse to be lower than that at steady state resistance, RDC. Many studies have established the relationship between the percentage reduction of Zimpulse from RDC in such that the percentage reduction is more pronounced ...
Mohamad Nor, Normiza, Syed Abdullah, Syarifah Amanina   +1 more
openaire   +2 more sources

The measurement of impulse grounding resistance and inductance of grounding network

Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137), 2002
It is well known that accurate measurement of grounding resistance and inductance under impulse voltage is of great importance for safe operation of electrical and electronic equipment. It is the behavior of grounding objects under impulse voltage instead under DC voltage that determine the safe operation of equipment.
null Chen Yunping, null Zha Xiaoming, null Zhao Lei   +2 more
openaire   +1 more source

Measurements of grounding resistances for high impulse currents

IEE Proceedings - Generation, Transmission and Distribution, 1998
The paper presents field measurements of surge characteristics of a concrete pole, a buried single conductor and a grounding net for high-impulse currents with a maximum magnitude of 40 kA and with a wavefront duration of a few microseconds. The measured results show that the grounding resistances are greatly dependent on the applied currents and have ...
S. Sekioka, H. Hayashida, T. Hara, A. Ametani   +3 more
openaire   +1 more source

Wavelet-based Analysis of Impulse Grounding Resistance–Experimental Study of the “A”-type Grounding System

Electric Power Components and Systems, 2015
AbstractThis article presents the results of experimental investigation concerned with the “A”-type grounding system's impulse characteristics, which are utilized for grounding of high-voltage transmission line towers. The investigation results point to the presence of high-frequency components in voltage and current signals that are not caused by ...
Meludin Veledar, Samir Avdakovic, Zijad Bajramovic, Milan Savic, Koviljka Stankovic, Adnan Carsimamovic   +5 more
openaire   +1 more source

Experimental Investigation of Impulse Resistance of Different Type Grounding Electrodes

2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon), 2020
When spreading large pulsed currents in the soil, the electrical properties of the soil, as well as the characteristics of grounding, may differ significantly from the values obtained when spreading a weak stationary current. This is due to the ionization of the soil near the electrode and the formation of spark channels, which leads to a noticeable ...
openaire   +1 more source

Modeling Research on Time-Varying Impulse Resistance of Grounding Grid

2018
The behavior of grounding systems excited by high-current show great differs from that at low-frequency and low-current. Simulation of high-current draining to earth require accurate modeling of tower grounding system. The current model cannot meet this requirement.
Tao Wang 0044, Xianzhe Hu, Yangping Li, Qi Wang   +3 more
openaire   +1 more source

Computing grounding resistance and impulse impedance of horizontal electrodes parallel or perpendicular to the interface of a vertically stratified soil using transmission line theory

Electric Power Systems Research, 2021
Abstract This work shows a procedure to compute the resistance and harmonic impedance of horizontal grounding electrodes buried in a vertically stratified soil. Such electrodes can be parallel or perpendicular to the interface of the vertically stratified soil. An additional resistive element is developed for such condition of soil. A procedure based
Raphael Batista, José Osvaldo Saldanha Paulino   +1 more
openaire   +1 more source

Calculation of Impulse Grounding Resistance of Extended Grounding Electrode

2013
In order to calculate the impulse grounding resistance of extended grounding electrode accurately, this paper introduces a method for computing the impulse grounding resistance based on the spark discharge characteristic of the earth, using a nonlinear differential circuit model. The relation curves of impulse grounding resistance with the current peak
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Influence of Overhead Ground Wire Height and Impulse Ground Resistance on Lightning Protection Performance of Distribution Line

Advanced Materials Research, 2015
Since distribution lines have relatively weak insulation compared to power transmission lines, it is more liable to lightning damages. This paper reports a study of how overhead ground wire height and impulse ground resistance affect the lightning protection performance.
Yao Zhang Yu, Jun Kang Ni, Jun Yu Han, Bin Ren, Ao An Li, Chong Xin Liu   +5 more
openaire   +1 more source

Impulse coefficient for square grounding grids in low resistivity soils: Influence of injection electrode

Journal of Electrostatics, 2014
Abstract Impulse coefficient is calculated, for the first time, by considering the response of the current injection electrode connected to ground grids for lightning subsequent return strokes. It is observed that the impulse coefficient can be substantially amplified specially for low resistivity soils (e.g.
Rodrigo M.S. de Oliveira, Jonathas F.M. Modesto, Marcos Rodrigo V. Maia, Daiyuki Maia Fujiyoshi, Adroaldo Raizer   +4 more
openaire   +1 more source