A Solution for Faults at Two Locations in Three-Phase Power Systems

Advanced Control Techniques for Enhance the Power System Stability at OOS Condition

“…The duration changing in the system can to analyze to three phase fault which the load impedance is decreases very fast, and the three-phase swing, the load impedance is gradually changes to inter in the distance zone setting. By creating Advanced Control Techniques for Enhancing the Power System Stability at OOS Condition new logic in the IEDs to block for the symmetrical three-phase fault distance protection function [24,27] . The new logic can to detect the OOS by adding new two zones greater than the bigger distance protection zone, where the stable swing will still between the two new zones for some cycle depend on the design system which can gradual change the load impedance from 3 cycles to 5 cycles [18][19][20] .…”

“…Figure 16 shows the anew creating two zones over from the actual setting for tripping threephase fault. At the apparent load impedance still for the setting time between the outer new zone and the inner new zone, so the out of step blocking OSB element will activate to block the symmetrical three-phase fault to 2 seconds [26][27][28] . OST schemes require for tripping scheme to separate the power system at key locations to achieve a new steady-state operating condition.…”