Transient response of a distribution circuit recloser and control unit to a high-altitude electromagnetic pulse (HEMP) and lightning

An analysis of the response of a power system distribution line recloser unit to a high-altitude electromagnetic pulse (HEMP) and a lightning direct-strike excitation is presented. From details of the configuration of the system, physical and mathematical models are developed, and a study of possible HEMP responses is conducted. Two voltage and two current responses at selected points within the system are studied for both the HEMP and lightning stresses. The possibility of simulating the HEMP responses is also discussed, with predicted and measured responses being provided for the advanced research EMP simulator (ARES). Based on a comparison of measured and predicted currents on one of the conductors, the model is shown to agree reasonably well with the measurement. With such a model, it is possible to perform parametric studies of the HEMP response of the system.<
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