Power-class recloser for high-speed circuit clearing

CONDUCTOR BURNDOWN, one of the distribution engineer´s major problems, focuses attention upon a need for higher speed interrupters. Automatic circuit reclosers with present “instantaneous” or “fast” time curves meet this need only partially because as much as 48 cycles is required to clear the circuit. A new design provides circuit clearing in one to three cycles, depending upon fault-current magnitude. It also provides 20-cycle re-closing for quick circuit pickup following clearing of a transient fault.