This article intends to identify and provide passive defense courses of action for power distribution systems in order to reduce vulnerability level when struck and threatened by insurgent and threatening groups. In this regard, a model of critical flow of the distribution system is firstly presented. Then by determining the vulnerable points of the power distribution system of Iran and by considering various kinds of threat factors, threats are verified. Later, mitigation methods of vulnerability level before, while and after being struck, will be examined and analyzed.
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