Analysis of adaptive single phase autoreclosing for high voltage transmission lines with various compensation levels

High voltage transmission lines have their terminals connected to buses through circuit breakers, which may allow single-phase operation at each side of line. These transmission lines are typically equipped with compensating devices, for example, shunt reactors. When a single phase to ground short circuit takes place, relay protection initiates circuit breakers at both sides of the line to open a faulted phase. Due to the electromagnetic coupling with unfaulted phases, the secondary arc from the faulted phase to the ground is supported for some time. The use of field test and ATP software, allows the analysis of transient electromagnetic processes at the transmission line with various levels of compensation during single phase autoreclosing. A developed multifactor algorithm for adaptive autoreclosing, by using measurements of electrical quantities at the faulted line, will determine in real time mode the moment when a secondary arc is extinguished. As a result, reclosing on existing fault is avoided, while restoration of the normal power supply is performed with minimal time interruption.