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New types of SF6 interrupting chambers, which implement innovative interrupting principles, have been developed during the past years, based on the objectives of reducing the operating energy of the circuit breakers and consequently increasing their reliability. This paper describes the rear-exhaust-type "self blast" double-volume thermal chamber, which was designed with the help of new chamber development software programs, of the physical imaging model of the arc. Simulations and confirmation by laboratories tests the interruption of short-circuit currents and, especially, the testing of short-circuit currents that have a nonpassage by zero on such a new chamber for applications to generator circuit breakers are shown and evaluated.
Date of Publication: Oct 2002