The reenergization of a large electric secondary network distribution system poses a severe problem for a utility. High inrush current lowers customer voltage to a value which may cause equipment to stall. In order to protect both customer and utility equipment, it is necessary to evaluate the network reenergization process in detail. The restoration of residential load requires more starting power than the reenergization of either commercial or industrial load because household appliances are not equipped with starters or low voltage cutoffs. For this reason, the study concentrated on a residential network. The method developed, however, is also suitable to other types of networks. This paper, presented in two parts, describes a study on the reenergization of a large electric secondary network distribution system. Part I describes a novel method for representing the start-up impedance of an appliance in terms of a dynamic model to be used later in a network reenergization computer simulation.
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