Abstract
Along with the operation of the Toboali Substation, studies needed to improve reliability. The ground disturbance that occurs in a feeder can cause a sympathetic trip in another feeder and effect the blackout of Toboali system. This is due to the choice of loop operating patterns on feeders and buses that tend to be close together. From the results of simulation and optimization of directional ground relay coordination it was found that before the improvement of energy not supplied due to sympathetic disturbances on the Toboali system was 51,261 MWh/year and after the improvement of energy not supplied became 21,170 MWh/year. Expected this optimization of protection coordination improves reliability and reduces the energy not supplied due to sympathetic disturbances that occur in Toboali substation.
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