Dynamics of Lightning Discharge During Return Stroke

Corona current concept in lightning return-stroke models of engineering typeA role of radial corona current in a lightning discharge is discussed in the paper. It is shown that the corona current concept previously introduced by Cooray for lightning return stroke models of distributed-current-source (DCS) type, and later, by Maslowski and Rakov for lumped-current-source (LCS) type models enables to show duality between these two types of models. Further, it is demonstrated that the corona current is useful during consideration of dynamics of the lightning-channel corona sheath. As an example of application of presented approach a relaxation model of charge motion in the corona sheath is analysed together with plots which show the rate of expansion and shrinkage of the lightning corona sheath on both microsecond and millisecond time scales.

Download Full-text

Study on the Vertical Component of Lightning Electric Field during Monsoon Period in Malaysia

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.554.623 ◽

2014 ◽

Vol 554 ◽

pp. 623-627 ◽

Cited By ~ 4

Author(s):

Behnam Salimi ◽

Zulkurnain Abdul-Malek ◽

Kamyar Mehranzamir ◽

Noor Azlinda Ahmad

Keyword(s):

Pulse Train ◽

Lightning Discharge ◽

Vertical Component ◽

Natural World ◽

Statistical Analyses ◽

Lightning Flash ◽

Time Duration ◽

Arithmetic Means ◽

Return Stroke ◽

Precise Knowledge

The most recognized and powerful demonstration of electrostatics in the natural world is a lightning discharge. The misoperation of several equipment and circuits would not only be caused by a direct contact with the lightning flash, but also by an indirect effect of a lightning channel. Appropriate information about lightning signature parameters can provide precise knowledge of lightning discharge that can be essential for the design of more improved detection and protective system. In this paper, the preliminary breakdown pulse train and the first return stroke of cloud to ground lightning discharge signatures observed in south of Malaysia are analyzed. Statistical analyses of the ratio between the maximum preliminary breakdown pulse trains amplitude and the first return stroke amplitude (BP/RS ratio), and the time duration between the high active part of the pulse train, and the return stroke (BP/RS separation) are presented. Observations on the statistical analyses show that about 94% of lightning signals have detectable breakdown pulses. The arithmetic means of BP/RS ratio and the BP/RS separation are 36.3% and 26.4ms, respectively.

Download Full-text

Observation of Isolated Breakdown Lightning Flashes in a Tropical Region

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.554.583 ◽

2014 ◽

Vol 554 ◽

pp. 583-587 ◽

Cited By ~ 4

Author(s):

Kamyar Mehranzamir ◽

Zulkurnain Abdul-Malek ◽

Behnam Salimi ◽

Noor Azlinda Ahmad

Keyword(s):

Electric Discharge ◽

Lightning Discharge ◽

Tropical Region ◽

Lightning Flash ◽

High Current ◽

Return Stroke ◽

Tropical Regions ◽

Cloud To Ground Lightning ◽

Main Portion ◽

The Impact

The impact of lightning on humans and its threats on life and structures have encouraged the scientists to pursue study in this field. Lightning flash is a high current electric discharge that can be classified into five categories which are intra-cloud discharges, cloud to cloud, cloud to air, ground to cloud and cloud to ground discharges. Intra-cloud discharges have the main portion of the lightning flashes. The most damages and disturbances of lightning flashes are due to cloud to ground and ground to cloud flashes. The discharge phenomenon has various behaviors even in the same thunderstorm. The cloud to ground lightning discharge starts with preliminary breakdown pulses followed by leaders which cause return strokes. The subsequent strokes happen after the first return stroke in a typical lightning flash, but in few flashes the discharges do not lead to any subsequent strokes. This research investigates on these types of flashes which are called isolated breakdown lightning flashes, in Malaysia. The isolated breakdown flashes have rarely been seen in tropical regions compared with temperate areas. Among 150 selected waveforms on 9thMay 2013 in our measurement station, only 10 isolated lightning flashes were observed in our dataset, which make up less than 7% of total flashes in one thunderstorm.

Download Full-text

Multi-Stroke Lightning Interaction with Wiring Harness: Experimental Tests and Modelling

Energies ◽

10.3390/en14082106 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2106

Author(s):

Kamil Filik ◽

Sebastian Hajder ◽

Grzegorz Masłowski

Keyword(s):

Lightning Discharge ◽

Measurement Data ◽

Experimental Tests ◽

Metal Plate ◽

Return Stroke ◽

Wiring Harness ◽

Multiple Stroke ◽

Impulse Current Generator ◽

Cable Bundle ◽

Impulse Current

This paper presents the obtained results of experimental tests and modelling of lightning disturbances that were propagated in a model of aircraft cable bundle and caused by multiple lightning return-strokes interactions. The work is a continuation of previous research, which was concerned mainly with the interaction of lightning discharge with a single return-stroke. The section of the cable harness arranged above the metal plate was investigated. In one of its wires, a multiple-stroke current representing indirect lightning effects was injected from an impulse current generator dedicated to avionics immunity tests. Overvoltages induced at the ends of other wires surrounded by a braided shield, as well as the influence of line parameters and shield grounding condition on the shape and level of observed transients, were examined. The computer simulation results match the measurement data with satisfactory accuracy, and therefore, the presented model can be used to estimate indirect lightning effects in the wiring harness of avionics.

Download Full-text