The main problem with this encroachment setting is that, we normally take 85% of nominal voltage and maximum loading in that feeder to find out the load resistance, then cut it with 30 degrees up and down side... But if we put encroachment setting at one substation, if a fault comes (vegetation fault, high resistive), tripping in that substation is dependent on Dir. EF now, but mostly, the fault is cleared by some upstream CB in zone 2 timing... Because maximum loading of upstream feeders are not same, hence load encroachment settings are different for all upstream elements. Moreover, the minimum ROT for DEF being 0.9 seconds most of the times, its highly likely for maloperation. Load encroachment is quite a complex thing to achieve with full perfection. Would like to know about your comments on this?
Thanks Sir
Sir, can u make video on resistive reach calculation for zone1, zone 2 and zone 3..R1ph, R2 ph, R3-R4 calculation
very nice work
The main problem with this encroachment setting is that, we normally take 85% of nominal voltage and maximum loading in that feeder to find out the load resistance, then cut it with 30 degrees up and down side...
But if we put encroachment setting at one substation, if a fault comes (vegetation fault, high resistive), tripping in that substation is dependent on Dir. EF now, but mostly, the fault is cleared by some upstream CB in zone 2 timing... Because maximum loading of upstream feeders are not same, hence load encroachment settings are different for all upstream elements. Moreover, the minimum ROT for DEF being 0.9 seconds most of the times, its highly likely for maloperation. Load encroachment is quite a complex thing to achieve with full perfection. Would like to know about your comments on this?
Due to infeed at local bus, it is very unlikely that upstream feeder see the fault in Zone-2.....