On the problem of shunt reactor tripping during single- and three-phase auto-reclosing

The application of shunt reactors (both controlled and uncontrolled) on HVAC overhead transmission lines improves operational characteristics, but at the same time it brings the line closer to the resonance. Operation of the shunt reactor-compensated transmission line that is close to the resonance, causes a large number of problems which in particular can be solved by temporary tripping of the reactor(s). The article focuses on some aspects of the SF6 shunt reactor circuit breaker operations during one-phase and three-phase auto-reclosing. In particular, the problem of accident-free shunt reactor tripping, as well as possible ways to solve it are discussed.