Results 171 to 180 of about 314,581 (221)

High-Accuracy Comparison of Lightning and Switching Impulse Calibrators

IEEE Transactions on Instrumentation and Measurement, 2007
This paper summarizes the results of a comparison on two calculable impulse voltage calibrators and one commercial calibrator between Helsinki University of Technology, Finland (MIKES-TKK), Nippon Institute of Technology, Japan (NIT), and Physikalisch-Technische Bundesanstalt, Germany (PTB).
Wakimoto, Takayuki, Hällström, Jari K., Chekurov, Y., Ishii, M., Lucas, Wolfgang, Piiroinen, J., Shimizu, Hiroyuki   +7 more
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Robust evaluation procedure for lightning impulses

Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417), 2004
The existing recommendation for high voltage tests, IEC Publication 60060, is ambiguous in the evaluation of the impulse test voltage, when oscillations or overshoot are superimposed on the peak of the smooth, double exponential waveshape. Particularly impulse tests on transformers may be critical due to the high stress on the insulation during the ...
K. Hackemack, E. Gockenbach
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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
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Lightning Impulse Voltage Evaluation

2017
This research studied and developed software for lightning impulse voltage parameters evaluation. Full lightning impulse voltage of 9 cases in TDG program had been used as references for software tested. This software created 2 types of voltage waveform which are mean curve and approximate real curve. Kalman Filter had been used for mean curve.
Nopphadon Khodpun, Krisada Vilailak
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Virtual Instrument for Lightning Impulse Tests

IEEE Transactions on Power Delivery, 2007
We propose an objective formulation of the impulse analysis problem from a signal analysis viewpoint. The winding response is quintessentially that of a deterministic network to a finite energy signal, with breakdown and partial discharge being inherently nonlinear events.
A. Palani, V. Jayashankar
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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
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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
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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
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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
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