Naslov
Current Transformer modeling in EMTP-RV for transients studies

Autori
Filipović-Grčić, Božidar ; Uglešić, Ivo

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, pp prezentacija, znanstveni

Izvornik
"EMTP-RV Academic User Group Meeting", Sarajevo, Bosna i Hercegovina, 17.05.2012. / - , 2012

Skup
"EMTP-RV Academic User Group Meeting", Sarajevo, Bosna i Hercegovina, 17.05.2012.

Mjesto i datum
Sarajevo, Bosna i Hercegovina, 17.05.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
current transformer; saturation; relay protection system; EMTP-RV

Sažetak
During the last decades the demands on current transformers for protection has increased rapidly. Overcurrents in power networks and also time constants for the short-circuit DC offset are increasing. Very short breaker tripping times are stipulated and achieved by fast operating protective relay systems. The relays must perform measurements at a time when the transient (DC offset) is present in short-circuit current. A normal protective core in a current transformer will saturate very rapidly due to high currents and remanent flux. After saturation occurs, the current transformer output will be distorted and the performance of the relay protection system will be affected. For protection relays intended to operate during a fault the core output under transient conditions is of importance. Analysis of CT saturation under transient conditions (AC and DC saturation) was performed in EMTP-RV software. The voltage at the current transformer secondary terminals directly affects the current transformer saturation. This voltage is developed in a loop containing the secondary wires and the burden of all relays in the circuit. The effect of burden on CT saturation was analyzed in EMTP-RV.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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