Results 191 to 200 of about 298,299 (227)
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Circuit for Impulse Testing of Gas-Tube Lightning Arresters
IEEE Transactions on Communications, 1972Telephone 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.
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Modelling H.V. reference dividers for lightning impulses
11th International Symposium on High-Voltage Engineering (ISH 99), 1999In 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 +3 more
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Lightning Impulse Current Tests on Conductive Fabrics. [PDF]
CoRR, 2019 Submitted to "Journal of Industrial Textiles"The large amount of electric current associated to lightning discharges is hazardous for living beings, equipment, structures and buildings.
Jorge A. Cristancho C. +5 more
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Metodology for Lightning Impulse Voltage Divisors Design
IEEE Latin America Transactions, 2009This 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 +3 more
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Lightning impulse corona characteristics of conductors and bundles
IEEE Transactions on Power Delivery, 1997The 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
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Soil ionisation under lightning impulse voltages
IEE Proceedings - Science, Measurement and Technology, 2004Experiments 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
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Coaxial attenuators for standard lightning impulse measurements
2012 Conference on Precision electromagnetic Measurements, 2012Characteristics 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
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Nonlinear Interpretation Technique for Lightning Impulse Test
IEEE Transactions on Power Delivery, 2015The nonlinear interpretation technique is proposed to detect the fault in transformer windings during the impulse test. To prove feasibility of the proposed technique, 90-MVA 220/110-kV, 250-MVA 500/275/33-kV transformers, and a 22-kV interleaved winding are used.
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Lightning Impulse Behavior Of Conducting Composite Electrodes
2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2006During 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 +5 more
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Tests with High Lightning and Switching Impulse Voltages
2014Lightning impulse (LI) over-voltages and switching impulse (SI) over-voltages are caused by direct or indirect lightning strokes or by switching operations in electric power systems, respectively. They cause transient stresses to the insulations, much higher than the stresses due to the operational voltages.
Wolfgang Hauschild, Eberhard Lemke
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