Luminosity characteristics of initial continuous current pulses in upward lightning flashes

Author

Miki, Megumu ; Miki, Toru ; Shindo, Takatoshi

Author_Institution

Electr. Power Eng. Lab., Central Res. Inst. of Electr. Power Ind., Yokosuka, Japan

fYear

2012

fDate

2-7 Sept. 2012

Firstpage

1

Lastpage

7

Abstract

The luminosity characteristics of initial continuous current pulses (ICC pulse) in upward negative lightning flashes were observed using the automatic lightning progressing observation system (ALPS) at the 200 m chimney in the Fukui thermal power plant. Furthermore, the current waveforms of upward negative lightning flashes were measured with two shunt resistors. As a result, we obtained 81 current waveforms and 20 image files using ALPS from 1989 to 2008. From our observation results, we analyzed the luminosity variation of the lighting channel involving ICC pulses in the upward lightning flash. 13 of the 20 ICC pulses were accompanied by upward progressing luminous phenomena. From the obtained analysis results, we found that the average speed of the luminous channel was about 7×10⁷m/s, which is close to return stroke speed.

Keywords

lightning protection; thermal power stations; ALPS; Fukui thermal power plant; ICC pulse; automatic lightning progressing observation system; current waveforms; initial continuous current pulses; lighting channel; luminosity characteristics; luminosity variation; shunt resistors; size 200 m; upward negative lightning flashes; upward progressing luminous phenomena; Current measurement; Integrated optics; Lightning; Optical pulses; Power systems; Resistors; Sea measurements; ALPS; ICC pulse; upward lightning;

fLanguage

English

Publisher

ieee

Conference_Titel

Lightning Protection (ICLP), 2012 International Conference on

Conference_Location

Vienna

Print_ISBN

978-1-4673-1898-3

Electronic_ISBN

978-1-4673-1896-9

Type

conf

DOI

10.1109/ICLP.2012.6344264

Filename

6344264