Results 181 to 190 of about 298,299 (227)

A new proposal for the evaluation of lightning impulses

Proceedings of the 6th International Conference on Properties and Applications of Dielectric Materials (Cat. No.00CH36347), 2002
In this contribution a new method for the characterization of lightning impulses superimposed with oscillations and overshoot is presented. The proposal bases on experimental investigation on lightning impulse tests performed with different dielectric media in the framework of an European project.
K. Hackemack, P. Werle, E. Gockenbach, H. Borsi   +3 more
openaire   +1 more source

Lightning Impulse Tests on Tower Models

IEEE Transactions on Power Apparatus and Systems, 1984
Lightning impulse tests on long insulator strings have been carried out in an attempt to determine the impulse strength of tower insulation in the EHV-UHV ranges.
J. R. Fonseca, V. H. G. Andrade, P. C. V. Esmeraldo, L. E. N. Dias   +3 more
openaire   +1 more source

Modern impulse generators for testing lightning arresters

Electrical Engineering, 1942
1. Thorough testing of lightning arresters requires a wide variety of impulse-current waves. 2. The strictly mathematical calculation of circuit constants to produce such waves is limited to the few cases where the circuit resistance is constant. 3. Valve-type lightning arresters have a resistance that is intentionally a function of voltage or current ...
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Electrical parameters of water at lightning impulse

Proceedings of the 2014 15th International Scientific Conference on Electric Power Engineering (EPE), 2014
This paper deals with the description of the behavior of water at lightning impulses. The electric potential distribution in water at lightning impulses is simulated for the calculation of the safe distance. There are not hazardous conditions to human body at distances greater than the safe distance.
Michal Krbal, Petr Baxant, Jan Skoda, Stanislav Sumec   +3 more
openaire   +1 more source

Effects of Soil Ionization and Lightning Impulse Corona on Lightning Current Strike

2020
With the new structural changes of power system that has emerged in recent years, which makes manufacturing units transmit more and more electrical power from the transmission lines, it is expected that a wider voltage collapse in the power systems happens.
Amouzad Mahdiraji, Ebadollah, Yousefi Talouki, Amir   +1 more
openaire   +1 more source

Evaluation of Residual Inductance of the Impulse Generator for the Generation of Lightning Impulse Voltage

2020
This paper presents an optimization method for the design and analysis of impulse generators according to the requirements of the international standard IEC 60060-1. An optimization algorithm has been developed to calculate the residual inductance in the impulse generator circuit. The optimization approach can calculate the residual inductance which is
Nidhi Chandrakar, Chadaram Chandra Sekhar, K. Chandrasekaran   +2 more
openaire   +1 more source

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

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

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