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DIFERENČNA ZAŠČITA NA VODU S TREMI ODCEPI
KRAGELJ, JOŽE (Author), Pantoš, Miloš (Mentor) More about this mentor... This link opens in a new window

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Abstract
Nova proizvodna enota TEŠ blok 6 se je v elektroenergetski sistem vključila s 400 kV daljnovodom Podlog-Šoštanj, na katerem že obratuje blok 5. Posledično se je morala spremeniti tudi zaščitna shema diferenčne zaščite daljnovoda z dvema odcepoma na diferenčno shemo za daljnovod s tremi odcepi. V magistrskem delu je raziskana izvedba nove zaščitne konfiguracije diferenčne zaščite na 400 kV daljnovodu s tremi odcepi. Ta konfiguracija diferenčne zaščite zajema tokove vseh treh odcepov, ki so zaključeni v enem samem numeričnem terminalu. V simulacijskem programu je analizirano sestavljeno omrežje skupaj s pripadajočimi elementi. Pri tem so upoštevani enaki tokovni transformatorji na vseh treh odcepih daljnovoda. Tokovni transformatorji v simulacijskem programu so natančno modelirani, njihovi parametri so bili izračunani iz izmerjenih magnetilnih krivulj. Na podlagi številnih simuliranih okvar v omrežju je raziskana veljavnost nastavitev parametrov diferenčne zaščite, ki jih predlaga proizvajalec relejev. V zaključku so podani predlogi primernih nastavitev parametrov diferenčne zaščite, ki bi zagotavljali absolutno selektivnost zaščite.

Language:Slovenian
Keywords:diferenčna zaščita, tokovni transformator, delovna karakteristika, TEŠ, T priključek
Work type:Master's thesis (m2)
Organization:FE - Faculty of Electrical Engineering
Year:2016
Views:1212
Downloads:488
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Secondary language

Language:English
Title:DIFFERENTIAL PROTECTION OF THREE-TERMINAL POWER LINE
Abstract:
The new TEŠ generating unit 6 was connected to the power system with an existing 400 kV overhead line Podlog-Šoštanj on which unit 5 was already operating. Consequently the protection schematic of differential protection for the line with two feeders had to be changed for the case of line with three feeders. The masters thesis presents and analyzes a new configuration of differential protection of the 400 kV overhead line with three feeders. This new schematic of differential protection takes currents from three line feeders, which are connected to a single numerical terminal. A simulation network is modeled in a simulation software together with all the network elements. Same current transformers on all three line feeders are used in the simulation model. Current transformers are precisely modeled, together with their magnetizing curves which were obtained with measurements. Based on numerous simulated faults in the network the adequacy of differential protection parameter settings is analyzed. These settings are based on recommendations of the protection relay supplier. Finally, the suitable range of differential protection parameter settings is suggested in order to ensure absolute selectivity of protection.

Keywords:differential protection, current transformer, operating characteristic, TEŠ, three feeders

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