Reclosing Evaluation Using Simplified Arc Model

The interaction between a fault arc and power system has a big influence on the successful reclosing of a faulted system and hence evaluation of this interaction is very important. This paper mainly focuses on a proposed technique of simplified arc model for evaluation of single phase reclosing scheme for extra high voltage transmission system. Both primary and secondary arcs behavior have been simplified and implemented in a custom PSCAD/EMTDC model as a time-varying resistance. The successful singlephase reclosing is investigated by conducting fault clearing and reclosing cases utilizing the simplified arc model. The illustrative cases are presented in order to determine approximately the maximum arc duration that may be expected. To improve the scheme, the shorten pre-set dead time is investigated. The proposed simplified arc model has been used to evaluate the studied existing EHV transmission system for single phase reclosing. By making the pessimistic assumptions with respect to still air conditions, the more severe conditions derived from the studied system were simulated to determine the longest likely extinction times. Keywords— Single phase reclosing; Secondary arc current; Arc model; ElectroMagnetic Transients Program.