《Table 2 Voltage limit violations per case》

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《Identification of system vulnerabilities in the Ethiopian electric power system》

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Next，computer simulation is run for each line outage and，it is obtained that there are 28 severe line outages whose active power flow performance indices are greater than 1.0 pu and voltage level performance indices are greater than 0.02 pu.The ends of the transmission lines associated with the most severe line outages are labeled in Fig.3.It is evident that most of these line outages are predominantly along the highest voltage transmission lines（400 k V&230 k V）connecting the regional power systems of the country to the capital，Addis Ababa.Almost all of the line outages affect the high load centers，i.e.，Addis Ababa and central regions，as can be seen in Table 1 and Table2.This knowledge implies that as far as the transmission network is concerned，the main weaknesses of the EEP grid are on the lines feeding Addis Ababa and Central regions from the rest of the regional power systems.