Calculational Techniques for the Late-Time HEMP Effects on Power Distribution Systems

This paper presents the steps in modeling the effects produced by late time E3 EMP on the US grid. The basic technique consists of creating a quasi-static model of the grid to calculate the current flow in the grid resulting from late time HEMP and use a set of tables based on the transformer voltage and type to calculate the reactive demand in MVAR in the system. If this exceeds the available generation capacity, the system will undergo voltage collapse