SURGE PROTECTION OF BUILDINGS CONNECTED TO AN OVERHEAD LOW-VOLTAGE NETWORK

U prenaponskoj zaštiti na niskom naponu postoje tri klase uređaja prenaponske zaštite. Predstavljena metoda izbora uređaja prenaponske zaštite može se koristiti pri donošenju odluke koje klase treba biti uređaj prenaponske zaštite koji se postavlja u priključni mjerni ormarić objekta. Metoda je testirana na jednoj tipičnoj nazemnoj niskonaponskoj mreži u Hrvatskoj. S obzirom na dobro iskustvo s uređajima prenaponske zaštite klase II u transformatorskim stanicama u toj mreži, može se zaključiti da je uređaj prenaponske zaštite klae II sasvim primjeren i za objekte spojene na niskonaponsku mrežu.There are three clases of surge protective devices for low-voltage system. The method for the selection of surge protective devices presented can be used to determine which class of surge protectice device should be inastalled in the service entrance of a building. The method has been tested on a typical ovehead low-voltage network in Croatia. Based upon good experience with Class II surge protective devices in the transformer stations of this network, it can be concluded that Class II surge protective devices are quite suitable for buildings connected to a low-voltage network