Apparatus for triggering alarms and waveform capture in an electric power system

摘要

A monitor/analyzer (1) for an ac electrical system (3) can be programmed through a display (23) on the front panel (19) to respond to selected events by generating triggers signals when selected monitored electrical parameters including neutral current exceed programmed thresholds. The trigger signals initiate simultaneous waveform capture of multiple waveforms in the ac system (3). Multiple trigger signals result in sequential waveform capture so that if a plurality of triggers are programmed for the same event, extended waveform data is captured for the event. Alarm screens (63) are generated in response to the events, as well as for hardware failure, an excessive neutral-to-ground voltage or reverse sequence. <IMAGE>