Abstract
Abstract—One of the main concerns in establishing high voltage electrical is switching over voltages. According to the typical design of these substations all of the circuit-breakers connected to overhead lines or transformers must have switching shunt resistance or synchronizing switch to limit the switching over voltages. These parallel resistances are very expensive and so the synchronizing switches. In fact in some cases, there are some technical factors that can lower the price of the solution for the overvoltage problem. In this paper the effects of length of overhead lines on switching over voltages are analyzed, details of system components modeling are outlined. This study can propose a method for needs assessment of shunt resistances or synchronizing switches. System components are implemented in EMTDC/PSCAD software. Simulations are executed for Fajr II 400/132KV GIS substation during design period and the results show that there is no need for shunt resistors or synchronizing switches for the CBs of the substation.
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