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In this paper, a methodology is proposed for the evaluation of the impact of cyber attacks on the power grid. This is a systematical approach to evaluate the vulnerabilities of SCADA system at three levels, i.e., system, scenario, and access points. The impact of potential intrusion is evaluated based on the power flow solution. The cause-effect on the proposed method determines the likelihood of the consequence, which can be evaluated based on a substation outage. An IEEE 30 bus system is used to build a test case for the proposed method.
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