초록 ▼

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 processin

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.

대표청구항 ▼

An AC waveform monitoring system comprising: detecting means for providing a sensed analog signal; oscillator means coupled to said detecting means for generating a zero crossing signal; said oscillator means including means for synchronizing said zero crossing signal with a frequency of said sensed

An AC waveform monitoring system comprising: detecting means for providing a sensed analog signal; oscillator means coupled to said detecting means for generating a zero crossing signal; said oscillator means including means for synchronizing said zero crossing signal with a frequency of said sensed analog signal and means for generating a control signal representing nonsynchronous operation with said generated zero crossing signal during a power outage; signal processing means coupled to both said detecting means and said oscillator means for identifying a peak voltage value of said sensed analog signal responsive to said zero crossing signal, said signal processing means including voltage integrating means for identifying an integral volt-seconds value of said sensed analog signal responsive to said zero crossing signal; and digital processing means coupled to said signal processing means and said oscillator means for receiving said identified peak voltage value and said identified integral volt-second value, said digital processing means including memory means for storing a plurality of predetermined voltage boundary signal values; and program means utilizing said received peak voltage value, said received integral volt-second value and said stored predetermined signal values responsive to said zero crossing signal for identifying the presence of one of a plurality of predefined abnormal voltage events.