Método de cálculo da tensão de restabelecimento transitória em disjuntores de alta tensão utilizando a impedância equivalente do sistema

Abstract

This work will present a method of calculating the transient reset voltage in high voltage circuit breakers, for two types of systems: radial systems and spotted systems. For a better understanding, the transient reset voltage (TRT) is an electromagnetic transient that occurs between the circuit breaker terminals when it is tripped, that is, when its terminals are opened. At this moment, an electrical arc is established between the terminals of the device, which will only disappear when the instantaneous current value passes through zero. It is at this moment that the phenomenon of (TRT) appears a transient that can be quite destructive in circuit breakers. Thus, in this work, the development of a methodology for calculating this TRT will be approached, based on the use of the equivalent impedance of the system, associated with a current source, the value of which will vary according to the position of the short circuit in the system. Also, some cases of validation of the method will be shown, through simulations and comparisons using the ATP software.