An Optimal Strategy for Three-Phase Intelligent Auto-Reclosing of Power Lines with Shunt Reactors

Intelligent auto-reclosing technology is an effective method for mitigation of switching overvoltages that occur during reclosing of power lines with shunt reactors. The idea of this technology is to precision control the moment when the power line is energized to reduce the intensity of electromagnetic transients that induce overvoltages. In this paper, we consider the application features of the theory of intelligent auto-reclosing of long transmission lines with shunt reactors in a three-phase auto-reclosing cycle. The principles of choosing line phases energizing moments are investigated and the optimal strategy of three-phase intelligent auto-reclosing is proposed. In contrast to the known strategy, the new strategy takes into account both the inter-phase coupling effect and the influence of the spread of circuit breaker operation time on. The modeling proved better efficiency of the new strategy compared with a known strategy of intelligent auto-reclosing and significant advantages over traditional metal-oxide surge arresters, even if a spread of circuit breaker operation time exists.