NDLI: Study of the winter lightning ground flash density investigated by the lightning location systems

Content Provider	IEEE Xplore Digital Library
Author	Udo, T.
Copyright Year	1986
Description	A network of lightning location systems covering the entire Japanese Archipelago has been operational since the late 1980s. However, the operational records appear to be distorted relative to winter lightning flash densities. The maximum flash density registered was 0.3 flashes/km/sup 2/ per one winter season, a mere one-tenth of the corresponding figure for severe summer lightning anywhere along the archipelago. On the other hand, the fault frequencies of overhead transmission lines constructed in the severe winter lightning districts are comparable with those of severe summer lightning districts. The author submits to resolve the apparent disparity by introducing two analytical parameters, namely 1) the propagation velocity of the return strokes of the winter lightning, and 2) the seasonal difference in the altitude of the lightning charge in the cloud. Consequently, the author proposes a certain seasonal modification of the threshold level applicable to the operation of lightning location systems.
Sponsorship	IEEE Power Engineering Society
Starting Page	1613
Ending Page	1619
Page Count	7
File Size	325233
File Format	PDF
ISSN	08858977
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lightning Power transmission lines Optical propagation Magnetic field measurement Sea measurements Clouds Monitoring Surge protection Frequency Electric variables measurement winter lightning Altitude of cloud flash density lightning location systems propagation velocity of return stroke threshold level
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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