Protección de distancia en las líneas con derivación

. In this work, the use of distance protection as the main protection in transmission lines with shunts was analyzed. OBJECTIVE. Show that distance relays should not be the main protections in a transmission line. METHOD. Mathematical modeling was performed with positive sequence intermediate source virtual experiments and triphasic and monophasic shorts to ground were simulated on a generic transmission line. RESULTS. It was shown that distance protection has errors in fault location and that under-range errors in distance relays are frequent on shunted transmission lines. DISCUSSION AND CONCLUSIONS. In shunt lines with generation in the shunts, the effect of the intermediate source of positive sequence causes considerable errors in the location of the fault, even when there are transformers in the shunt, this causes the effect of an intermediate source but with currents of zero sequence that it also causes errors in the location of the phase-to-ground fault. It was shown that distance protection should not be used as the main protection in transmission lines, much less if there are branches.