Results 241 to 250 of about 664 (264)

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

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

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

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

Impulse characteristics of grounding systems of transmission-line towers in the regions with high soil resistivity

POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151), 2002
The lightning protection effects of power transmission lines are related to the impulse characteristics of grounding systems of transmission-line towers. The influences of several main factors on impulse grounding properties are systematically analyzed by simulation experiments according to the simulation theory in this study.
null He Jinliang, null Zeng Rong, null Chen Shuiming, null Li Siyun, null Wu Weihan   +4 more
openaire   +1 more source

A simplified method for calculating the impulse resistance of vertical grounding rods

2002 IEEE Region 10 Conference on Computers, Communications, Control and Power Engineering. TENCOM '02. Proceedings., 2003
A simplified method is proposed for calculating the impulse resistance of vertical grounding rods. The analytic formula is first derived to determine the low current resistance and then the calculation procedure is developed to estimate the impulse resistance.
openaire   +1 more source