Abstract
This paper explains the algorithm for the longitudinal differential protection of transmission lines with automatic reclosing. Classic stabilization is not sufficient for avoiding of unnecessary operations caused by saturation of current transformer. This problem can occur during the fault plased outside of the protected zone of the transmission line. It is shown how unnecessary operation can occur during the outside fault whithout using of additional stabilization. The different types of faults were simulated and comparison of relay operations with and without additional stabilization is presented. The simulations were performed on the three-phase model of the transmission line formed by using of MATLAB/Simulink program.
Highlights
Na ulaz bloka dovode se strujni signali iz svake faze i sa obe strane dalekovoda
The different types of faults were simulated and comparison of relay operations with and without additional stabilization is presented
Summary
Za model voda izabrani su parametri 110 kV dalekovoda. Sa obe strane dalekovoda nalaze se "jake" mreže. Model dalekovoda za simulaciju algoritma formiran je pomoću programskog paketa MATLAB/Simulink i prikazan je na slici 1 [1,2,3,4,5,6,7]. Relej je u modelu implementiran pomoću bloka Matlab function. Na ulaz bloka dovode se strujni signali iz svake faze i sa obe strane dalekovoda. Tod, podešena je vrednost od 1 ms Adresa autora: Tomislav Rajić, Univerzitet u Beogradu, Elektrotehnički fakultet, Beograd, Bulevar kralja Aleksandra 73.
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