TIMING CONTROL CIRCUIT FOR SOLID STATE PROTECTIVE RELAYS FOR PROVIDING NOVEL CONTROL OF THE PICKUP AND TIMING CIRCUITS PROVIDED THEREIN

摘要

A static relay having sensing, reference, pickup and timing circuits and comprising a novel timing control circuit. The pickup circuit functions to initiate operation of the timing circuit when a predetermined threshold level of overload conditions exist. The novel timing control circuit functions to prevent the timing circuit from being reset due to momentary dips below the aforesaid threshold level while providing means for rapid reset of the timing control circuit when the input being monitored remains below the threshold.