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Električne razmere vzdolž dolgega nadzemnega voda
ID BAŠ, BERNARDA (Author), ID Rudež, Urban (Mentor) More about this mentor... This link opens in a new window

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Abstract
Magistrsko delo predstavlja električne razmere na dolgem nadzemnem vodu pri priključitvi na izmenično napetost (naelektritvi) in ob atmosferski razelektritvi. Delo obsega modeliranje dolgega nadzemnega voda. Opisuje in prikazuje pojav Ferrantijevega efekta, kompenzacijo s paralelnimi dušilkami, pojav zakasnjenega prehoda električnega toka skozi nič ter vpliv trenutka vklopa nadzemnega voda na stikalne prenapetosti. Prav tako opisuje dogajanje na vodu pri enkratnem udaru strele v fazni vodnik, potovanje in odboje napetostnih valov v različnih časovnih odsekih in delovanje prenapetostnih odvodnikov na vodu. Prikazan je tudi vpliv nične komponentne kapacitivnosti na napetost na vodu. Simulirani so različni scenariji za primer naelektritve in udara strele v fazni vodnik. Rezultati simulacij naelektritve so pokazali, da kompenzacija s paralelnimi dušilkami na vodu reši problem Ferrantijevega efekta, se pa zato pojavi zakasnjen prehod toka skozi nič. Pri udaru strele poleg opazovanja potujočega napetostnega vala opazujemo tudi prenapetostne odvodnike, ki prenapetosti dobro omejujejo.

Language:Slovenian
Keywords:model nadzemnega voda, naelektritev, prenapetost, udarni val, potujoč val
Work type:Master's thesis/paper
Organization:FE - Faculty of Electrical Engineering
Year:2019
PID:20.500.12556/RUL-112962 This link opens in a new window
Publication date in RUL:25.11.2019
Views:1257
Downloads:229
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Secondary language

Language:English
Abstract:
Master’s thesis deals with electrical conditions on overhead transmission line when energizing and at the moment of atmospherically discharge. Master’s degree comprises modeling of long overhead transmission line. Ferranti’s effect, parallel shunt reactor compensation, effect of zero missing crossing and impact of moment of energizing on switching over voltages are described. Voltage travelling waves are shown when lightning strikes the phase conductor in different time sections. Also surge arresters are included in the simulation. Impact of zero capacitance on transmission line is represented. Different scenarios for energizing and lightning strike in phase conductor are simulated. Results indicate that shunt reactor compensation solves problem of Ferranti effect, but at the same time zero missing crossing is caused. Surge arresters response well at lightning over voltages.

Keywords:model of overhead line, energizing, surge voltage, lightning strike, travelling wave

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