Lightning in hybrid cable-overhead lines and consequent transient overvoltages

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Abstrakt

Whereas lines that consist entirely of underground
cable are naturally protected from lightning, the phenomenon
must be considered for lines that are a mix of overhead lines and
underground cables. The difference between overhead lines and
underground cables wave impedances may lead to transient
overvoltages caused by reflections at the transitions points. This
paper explains the phenomenon and analyses the influence of
modelling Corona effect, the grounding of the towers and of the
cable’s screen on the overvoltage magnitude. The analysis is
made both for direct strokes on the overhead line phase
conductor and for hits on the earth wire, with and without back
flashover. For the most common situation, stroke on the earth
wire, it is demonstrated that the cable’s ground propagation
mode is dominant, reducing the impact of the reflections.
Keywords: Hybrid cable-overhead lines, Lightning, Corona,
Transient Overvoltages
OriginalsprogEngelsk
TitelProceedings of International Conference on Power Systems Transients, IPST 2017
Antal sider7
ForlagInternational Conference on Power Systems Transients, IPST 2017
Publikationsdatojun. 2017
Artikelnummer17IPST083
StatusUdgivet - jun. 2017
BegivenhedInternational Conference on Power System Transients - Sungkyunkwan University (SKKU), Seoul, Nordkorea
Varighed: 26 jun. 201729 jun. 2017
http://ipst2017.com/

Konference

KonferenceInternational Conference on Power System Transients
LokationSungkyunkwan University (SKKU)
LandNordkorea
BySeoul
Periode26/06/201729/06/2017
Internetadresse

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