An Case Analysis on Transmission Line Three-Phase Current Unbalance in a Closed Electromagnetic Loop

Three-phase current unbalance exists in power system widely. This paper presents an unbalance case of a 220kV transmission line in a closed 550kV/220kV electromagnetic loop, with analyzing its causes and influence factors. Finally, from the aspect of power system operation, this paper summarizes conclusions, which will help provide reference for similar research in the future.