It is found that the MHD-EMP environment would have a marked effect on a power system by inducing up to several hundreds of amperes of quasi-dc current on power lines. These calculated responses are compared with measurements of transformer operation under dc excitation to infer the MHD-EMP response of these power system components. Various field coupling models are described, and calculated results for the responses of both transmission- and distribution-class power lines are presented. The MHD-EMP environment is briefly discussed, and a simplified form of the earth-induced electric field is developed for use in a parametric study of transmission line responses.
This report analyzes and discusses these phenomena. This saturation, in turn, causes 6-Hz harmonic distortion and an increase in the reactive power required by generation facilities. It can result in the flow of a quasi-dc current in grounded power lines and in the subsequent magnetic saturation of transformers. This environment, known as the magnetohydrodynamic electromagnetic pulse (MHD-EMP), is a very slowly varying electric field induced in the earth`s surface, similar to the field induced by a geomagnetic storm. This report discusses the effects of the late-time high-altitude electromagnetic pulse (HEMP) on electrical transmission and distribution (T&D) systems.
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