METHOD FOR DISCRIMINATING SUCCESS OF INTERRUPTION OF THYRISTOR BREAKER

摘要

PURPOSE:To reduce damages given to a load circuit or a load device and to miniaturize a thyristor element being a component of the titled breaker by supervising the quantity of current flowing from the interruptor in a prescribed time elapsed after an breaking command is given to the breaker so as to discriminate the success of current breaking thereby activating the high-order breaker. CONSTITUTION:A current extracted by a current detector 6 is inputted to a discriminator discriminating the presence of current. This discriminator starts operating with other electric quantity inputted together with a trip signal, confirms the input of the electric quantity from the said detector, uses the signal inputted to the discriminator in a prescribed time corresponding to a tA in figure after the trip signal is given so as to discriminate whether or not the signal inputted from the said current detector to the discriminator is consecutive. The high-order breaker is operated based on the result of discrimination. The time tA is a time when the success of interruption is discriminated in a time slightly longer than the time where a load circuit of the breaker is short- circuited.