hrvatski

Uklopne struje energetskih transformatora i utjecaj na djelovanje relejne zaštite

Energetski transformatori su skup i važan dio elektroenergetskog sustava. Trošak neplaniranih prekida napajanja energetskih transformatora je visok. Važno je minimizirati učestalost i trajanje prekidanja napajanje ove komponente elektroenergetskog sustava. Struja uklopa je jedan od najčešćih uzroka pogrešne prorade zaštite transformatora. Struja uklopa je prijelazna pojava kod energetskog transformatora koja se javlja pri uklopu u praznom hodu, a zbog remanentnog toka iznos amplitude struje uklopa može biti velik. Struja uklopa nije struja kvara, ali može izazvati neselektivnu proradu diferencijalne ili nadstrujne zaštite. U radu su obrađene slijedeće teme: - teoretska podloga i pregled literature na temu struje uklopa transformatora ; - princip rada diferencijalne zaštite i problemi prouzrokovani strujom uklopa ; - simulacija struje uklopa i rada diferencijalne zaštite. Power transformers are very expensive and vital component of electric power systems. The cost associated with unplanned outage of a power transformer is very high. So, it is important to minimize the frequency and duration of unwanted outages in this component. One of the main reasons for wrong operation of protection system for the transformer is inrush current. Inrush current is a transient current that occurs when energizing unloaded power transformer due to flux saturation in the core and its magnitude can be as high as fault currents. Because inrush current is not a fault current this may cause mal-operation of over-current protection or differential protection. In this task following topics are considered: - theoretical background and literature overview about inrush currents caused by power transformer energization ; - principle of operation of differential protection and operational problems caused by inrush currents. - simulation of inrush currents and transformer differential protection operation.

struja uklopa ; remanentni tok ; kontrolirani uklop ; diferencijalna zaštita ; uklop energetskog transformatora

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