Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2006-08-01
2006-08-01
Tsai, Carol S. W. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C361S024000, C361S055000, C702S061000
Reexamination Certificate
active
07085662
ABSTRACT:
There is provided a method and a power quality indicator coupled to an electrical circuit. The indicator comprises the summing device configured to received a sensed wave form from the electrical circuit, including at least one voltage wave form. A summing device is configured to provide a summed output voltage. A low pass filter (LPF) is electrically coupled to the summing device and configured to receive a summed output voltage from the summing device. The LPF is configured to provide a LPF voltage. A microprocessor is configured to receive the sum upward voltage the LPF voltage, compute an RMS voltage value for each of the summed output voltage, determine the difference of such RMS voltage values and generate a signal representative of the difference of the RMS voltage values, wherein the signal is proportional to the harmonic content in the electrical circuit.
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Siemens Energy & Automation Inc.
Tsai Carol S. W.
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