Vector electricity meters and associated vector electricity metering methods
US5673196A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1995 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Nov 30, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R21/1331
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Line voltage and line current signals are sensed on a power line having at least one conducting path. The sensed line voltages and line currents are converted into a digital signal. A phase-to-neutral voltage signal and phase current signal are computed from the digital signal to thereby define a phase of the power line. An interval of orthogonality is determined from the sensed voltage and current signals, coinciding with passage of an integral number of cycles of a fundamental frequency reference signal which is computed from the computed phase-to-neutral voltage signal. A vector metering quantity is computed for the determined interval of orthogonality from the computed phase-to-neutral voltage signal and the computed phase current signal. The vector metering quantities to be computed may be identified and computed based upon an associated detent. The vector metering quantity is also computed based on an identified circuit topology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.