Reza Rouhi Ardeshiri - Aliabad Katoul Branch, Islamic Azad University,Aliabad Katoul, Iran
Milad Moafi - University of Tabriz, Tabriz, Iran

One of the major problems of destruction the insulationsystem of electrical equipment in distribution networks in urbanelectricity, is surges resulting from clashing lighting to theequipment of distribution substation, that the Lightning Arrester isthe best thing in use to protect for controlling these surge. In thispaper, statistically, Mazandaran area is studied from the point viewof level isokeraunic and the various parts of the cities analyzedfrom the point view of seaboard, plain and mountainside; and anoptimum placement have been consider for the lightning Arrester.And according to the performed studies can conclude that the areaswhich are in high class from the level of Isokeraunic, they countedas the thundery places, like seaboard areas and mountainous areas,that it is essential to install 10 KA lightning Arrester. In urbanareas that there are building and high skyscrapers, we can removethe lightning Arrester and also in the places with sparselypopulated we can set the 5 kilo ampere lightning Arrester indistribution lines.

Lightning Arrester; Isokeraunic Level;Optimum Placement; Distribution Networks