High-voltage circuit breaker capable of cutting off fault currents with delayed zero crossing

摘要

The present invention relates to a high-voltage circuit breaker capable of cutting off alternating fault currents of pseudo-period T and with delayed zero crossing, crossing zero after a maximum time delay tzmax-t0 after the instant t0 of the appearance of the fault, comprising a plurality of first cutoff chambers (1) in series, each provided at their terminals with a distribution capacitor (2) of the same capacitance, and equipped with means (3) for opening at an instant t1 later than the instant of appearance of the fault at t0. It comprises at least one supplementary cutoff chamber (4) in series, equipped with means (6) for opening at an instant t2 after the instant of the fault, t0, lying between tzmax-T and tzmax+T, the said supplementary cutoff chamber (4) being provided at its terminals with a distribution capacitor (5) having the same capacitance as the distribution capacitors (2) of the said first chambers (1) and with a varistor (11). IMAGE