Researches about Controlling Switching SF6 Circuit Breaker Transition Regime

A transient regime appears in the electrical power supply systems, when the power supply status changes from one state to another. This may occur if an electrical discharge causes the lightning to touch the ground in the vicinity of a high-voltage transmission line or when the lightning strikes the station directly. Most transient regimes occurring in the electrical power supply systems are the result of a switching action. Network breakers from different nodes of the electrical power supply network are interrupting high currents and create short-circuit currents which are flowing into the faulty parts of the system. The time period in which the voltages and currents transients are produced is in the range of microseconds to milliseconds. This paper proposes a software program that command the current interruption of the circuit breaker in order to occur at zero crossing current in a time interval of microseconds.