<![CDATA[High voltage substations as pivotal sections of power network play an important role in power network because of supplying electrical energy for consumers. In recent years with increment of electricity consumption and complexity of power system, the substation stability and protection against various faults or overvoltages has been a big concern. Surge arresters as protective device has the responsibility of attenuating overvoltage due to lightning or switching occurring in transmission or distribution system. Absence or failure of arresters inside or near substations can lead to load interruption and great outage in the system. Therefore their presence is indispensable. Demonstrating the surge arresters presence necessity and evaluating their failure impact during normal operating condition and overvoltage in different scenarios of arrester location and lightning surge position in view point of EMTP simulation and reliability technique is the purpose of this paper.]]>
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