Results 181 to 190 of about 314,581 (221)

Modelling HV 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

Impulse current testing system for simulating lightning effect

2014 International Conference on Audio, Language and Image Processing, 2014
This paper introduced the impulse current testing system for simulating lightning effects. The shield method to suppress the interference was addressed in this paper. After compared with three filter methods, it was verified that the wavelet transform is most suitable for measuring the impulse by using the digital filter technology to get the actual ...
Yi Lin, Qibin Zhou
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

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

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

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

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

Lightning Impulse Breakdown Characteristics of Frozen Soil

IEEE Transactions on Power Delivery, 2008
The impulse characteristics of frozen soil are the fundament for the lightning protection design of the overhead transmission lines in frozen soil environments. In this paper, the conductivity and lightning impulse breakdown characteristics of the frozen soil were experimentally studied, and those key factors influencing the impulse breakdown ...
null Jinliang He, null Baoping Zhang, null Peng Kang, null Rong Zeng, null Bo Zhang   +4 more
openaire   +1 more source