Results 151 to 160 of about 1,350 (191)

Impulse Impedance Measurements of Lightning Protection Earthings

2019 IEEE PES GTD Grand International Conference and Exposition Asia (GTD Asia), 2019
Lightning protection earthing systems should be tested at currents with time parameters similar to those of lightnings. A method and definition of a measured value of impulse impedance are introduced. The impulse impedance was determined by a quotient of voltage drop on the tested earthing to a value of current in measure circuit. The usefulness of the
T. Horchue, W. Tangtheerajaroonwong, S. Wojtas, M. Woloszyk   +3 more
openaire   +1 more source

Characterization and Verification of Suitability of a Digitizer for Lightning Impulses

2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2018
This paper discusses the requirements and the performance of the recording instruments used in high voltage impulse measurements. The target of high accuracy and in the same time fast settling without creeping behaviour are the key issues of this work. Therefore, one of the most promising digitizers on the market was tested in linearity and temperature
T.-C. SchlUterbusch, S. Passon, J. Meisner, Z. Long   +3 more
openaire   +1 more source

Treeing inception of xlpe at lightning impulse voltage

European Transactions on Electrical Power, 1992
AbstractThis paper deals with investigations of the treeing inception of polyethylene insulation under lightning impulse voltage. The experimental results of investigations with XLPE samples in a needle‐plane arrangement will be presented and the influence of various parameters will be discussed.
K. Rittner, G. Borner
openaire   +1 more source

Circuit for Impulse Testing of Gas-Tube Lightning Arresters

IEEE Transactions on Communications, 1972
Telephone lines may be protected from lightning-induced surges by gas-tube lightning arresters. Typical arresters break down at 250-400 V dc. Breakdown voltage increases with the rate of rise of the applied voltage and may be two or three times the dc value at a rate of rise of 10 kV/μs.
openaire   +2 more sources

Modelling H.V. reference dividers for lightning impulses

11th International Symposium on High-Voltage Engineering (ISH 99), 1999
In this paper a numerical model for the simulation of the performances of HV reference dividers is presented; the model, based on a numerical procedure coupling electric field analysis and electrical circuit, is applied to the analysis of the 200 kV lightning impulse reference divider of the Istituto Elettrotecnico Nazionale Galileo Ferraris in Italy.
BOTTAUSCIO, ORIANO, SARACCO O, SARDI, ANGELO, ZUCCA, MAURO   +3 more
openaire   +3 more sources

Metodology for Lightning Impulse Voltage Divisors Design

IEEE Latin America Transactions, 2009
This paper presents a design methodology for damped capacitive voltage divider for lightning impulse waves measurement; the methodology includes design verification using three different computational tools (EMTP, MATLAB and ELCUT). The methodology was validated by constructing and testing two 300 kV dividers at the High Voltage Laboratory of the ...
Diego Fernando Garcia Gomez, Eduardo Marles Saens, Tulio Alberto Prado, Mauricio Martinez   +3 more
openaire   +1 more source

Lightning impulse corona characteristics of conductors and bundles

IEEE Transactions on Power Delivery, 1997
The paper describes an experimental study and a computational method of estimating the q-u corona characteristics of single and bundle conductors for conductor-plane and conductor-conductor gaps under lightning impulse voltages. Measurements were performed for individual subconductors in a bundle which provided data necessary for an estimation of ...
G.V. Podporkin, A.D. Sivaev
openaire   +1 more source

Soil ionisation under lightning impulse voltages

IEE Proceedings - Science, Measurement and Technology, 2004
Experiments have been carried out to study soil ionisation and the variation of the critical ionisation gradient against the soil resistivity. Compared with relevant experimental results of other researchers a satisfactory convergence has been proved. An accurate estimation of the critical ionisation gradient has been achieved, of the order of 200 kV/m,
I.F. Gonos, I.A. Stathopulos
openaire   +1 more source

Coaxial attenuators for standard lightning impulse measurements

2012 Conference on Precision electromagnetic Measurements, 2012
Characteristics of coaxial resistive attenuators of digital instrument for the standard full lightning impulse(LI) measurement are studied. The amplitude - frequency characteristics and the input impedance of two kinds of attenuators are analyzed. An approach to evaluation the scale factor of peak voltage for the attenuators are introduced based on the
Na Liu, Yiye Wu, Jiawei Chen
openaire   +1 more source

Lightning Impulse Behavior Of Conducting Composite Electrodes

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2006
During lightning impulse type testing of medium voltage switchgears up to two spark-overs are accepted. Consequently, when selecting conducting composites for use in screens and shields of such equipment it is important that their surfaces not degrade after a spark-over, as this normally will reduce the overall dielectric withstand level.
M. Runde, O. Lillevik, P. Roseen, O. Granhaug, R. Espeseth, P. Skryten   +5 more
openaire   +1 more source