Apparatus for triggering alarms and waveform capture in an electric power system
First Claim
1. Apparatus for monitoring an electric power system, comprising:
- means for sensing multiple waveforms in said electric power system;
sampling means for generating digital samples of each of said multiple waveforms sensed by said sensing means;
display means; and
digital processing means comprising processing means for generating from said digital samples of each of said waveforms values of a plurality of electrical parameters, programmable trigger means generating programmable trigger signals when said values of programmable ones of said electrical parameters exceed selected thresholds, and capture means capturing said digital samples for a selected portion of at least one of said waveforms in response to each of said trigger signals.
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Abstract
A monitor/analyzer for an ac electrical system can be programmed through a display on the front panel 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. 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 are generated in response to the events, as well as for hardware failure, an excessive neutral-to-ground voltage or reverse sequence.
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Citations
13 Claims
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1. Apparatus for monitoring an electric power system, comprising:
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means for sensing multiple waveforms in said electric power system; sampling means for generating digital samples of each of said multiple waveforms sensed by said sensing means; display means; and digital processing means comprising processing means for generating from said digital samples of each of said waveforms values of a plurality of electrical parameters, programmable trigger means generating programmable trigger signals when said values of programmable ones of said electrical parameters exceed selected thresholds, and capture means capturing said digital samples for a selected portion of at least one of said waveforms in response to each of said trigger signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification