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US 5,899,960 AGranted
Apparatus and method for power disturbance analysis and storage of power quality information
AssigneeReliable Power Meters, Inc.
InventorsRobert E. Moore, Frederic W. Nitz, Michael A. Gipe
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Abstract
A power monitoring system with associated signal processing and storage capabilities. Each leg of a three-phase power signal is simultaneously sampled on a plurality of channels to capture the instantaneous content of the power signal without time-skewing between the channels. In a further embodiment, the sampled data is converted into the frequency domain and parameters relating to the power quality of the power signal is derived from frequency-domain data.
Claims4
A method for monitoring power disturbances in a three-phase power system:
- simultaneously sampling at least three voltage measurements and at least three current measurements in a periodic fashion to obtain a plurality of sequences of analog samples, wherein said voltage measurements and current measurements are made on three power signals corresponding to each of three phases of the three-phase power system;
- digitizing said plurality of sequences of analog samples to obtain sequences of digital samples;
- converting said sequences of digital samples to frequency domain representations;
- determining power quality information from said frequency domain representations;
- and
- storing said power quality information.
3 more elements
A power measurement apparatus comprising:
- a sampler for periodically and simultaneously sampling a plurality of electrical inputs to produce a plurality of sequences of samples with each one sequence corresponding to one of said plurality of electrical inputs, wherein said plurality of electrical inputs represent measured voltages and currents for a plurality of phases of a power signal;
- an analog-to-digital converter coupled to an output of said sampler;
- and
- a processor coupled to said analog-to-digital converter for transforming said sequences into a frequency domain representation.
1 more element
Dependencies are inferred from the claim text.