CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Novel indicator of transmission line towers backflashover performance

Petar Sarajcev ; Damir Jakus ; Josip Vasilj (Institutionen för signaler och system, Reglerteknik)
Proceedings of the International conference on power system transients (IPST2017) (2017)
[Konferensbidrag, refereegranskat]

Transmission line (TL) backflashover (BF) performance is traditionally ascertained using a single number, the backflashover rate (BFR), which is measured in number of BF events per 100 km-years. This paper aims at presenting a novel indicator for measuring performance of high- voltage TL tower's ability to tolerate direct lightning strikes without provoking a BF event. This indicator is also a single number, which can be computed for any TL tower (by means of EMTP simulations) and measures, in a novel way, its tolerance against BF events. It is given in terms of the risk of the BF occurrence, which means it is statistical in nature and depends on the total sum of conditions governing the BF events. The BF risk, as an indicator, is obtained from the probability density function of the shield wire(s) incident lightning currents and the cumulative distribution function of the BF currents statistical distribution. Hence, it merges complete probabilities of obtaining lightning currents striking a tower with probabilities of those currents provoking a BF events on that tower. This novel risk-based indicator can be related to the price of that risk and the associated investment costs, enabling the cost-effective optimisation solutions to the problems of TL arrester applications and station insulation coordination design.

Nyckelord: Backflashover, EGM, EMTP, Gaussian Copula, Lightning, Risk, Transmission line



Den här publikationen ingår i följande styrkeområden:

Läs mer om Chalmers styrkeområden  

Denna post skapades 2017-09-28.
CPL Pubid: 252099

 

Institutioner (Chalmers)

Institutionen för signaler och system, Reglerteknik (2005-2017)

Ämnesområden

Energi
Elkraftteknik

Chalmers infrastruktur