Auto-Reclosing Scheme with Adaptive Dead Time Control Based on Synchro-Check Principle

Abstract

Series compensation plays important role in smart power grid to improve power transfer capacity and voltage profiles. Majority of faults occurring in the grid are transient in nature. However, the discrimination between transient fault and permanent fault are contemporary problems in the field of distance protection of transmission line. Advanced numerical relays implement auto-reclosing feature to detect the transient fault and regain the service continuity automatically when the transient fault is cleared. The research work outlined in this chapter presents an auto-reclosure scheme using synchronized voltage phasors across the breaker pole along with adaptive dead time control to enhance system stability. The developed auto-reclosing scheme provides adaptive dead time control for both uncompensated and series compensated transmission lines as compared to conventional schemes which normally respond with fix dead time control.