Power line waveform measurement system
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United States of America Patent
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Jun 25, 1991
Grant Date -
N/A
app pub date -
Feb 28, 1989
filing date -
Feb 28, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An AC waveform monitoring system includes detecting circuitry for providing a sensed analog signal. Oscillator circuitry is coupled to the detecting circuitry for providing a zero crossing signal. The oscillator circuitry is synchronized with a frequency of the sensed analog signal. Signal processing circuitry is coupled to both the detecting circuitry and the oscillator circuitry for identifying a peak voltage signal and an integral volt-seconds signal of the sensed analog signal responsive to the zero crossing signal. Digital processing circuitry is coupled to the signal processing circuitry and the oscillator circuitry. The digital processing circuitry includes memory for storing a plurality of predetermined signal voltage boundary values and a program utilizing the identified peak voltage signal, the integral volt-seconds signal and the stored predetermined signal values to identify an abnormal voltage event.
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