Influência de arco elétrico em disjuntores para estudos de tensão de restabelecimento transitória.

Abstract

In this work is a study to determine transient recovery voltages (TRV) of medium voltage circuit breakers taking into account the model of the electric arc, is presented. It has been analyzed the sensitivity of the TRV in a simple circuit and subsequently made an assessing study of TRV in circuit breakers class 72.5 kV at an existing substation. The digital simulation results show that the inclusion of the electric arc in the circuit breaker model provides a reduction in TRV peak values compared to the results of the representation of the circuit breaker as an ideal switch. Thus, for cases where the TRV peak is close to the limits established by breaker standards when the circuit breaker is modeled by an ideal switch, it is recommended that these simulations are done again including the effect of the electric arc in the model of the circuit breaker.