Application of Line Surge Arresters for Switching Over-voltages in UHV Transmission Systems

Insulation Coordination of a UHV AC Transmission Line Considering the Switching Overvoltage Waveshape

“…Sources: Generators are modelled as voltage sources in series with sub-transient reactance (Thevenin's impedance) 11,12 . The calculated zero and positive sequence impedances at the Wardha bus end based on the source short circuit level of 15000 MVA 13 are given in Table 2 14 .…”

“…Transmission lines: They are modelled as a frequencydependent (phase) model 11,12 and the parameters used to model the line in PSCAD are given in Table 3 9,13,14 . The considered transmission line is not transposed 13 .…”