Power quality utility metering system having waveform capture
US6675071B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1999 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Jan 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/2513
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of monitoring variations is carried out within an electrical energy meter containing means therein for metering a quantity of electrical energy generated by a supplier and transferred via a power supply line to a load. The method includes a first step of sensing a line voltage transferred via the power supply line to the load during the energy measurement time interval. The method also includes the step of detecting a variation in a magnitude of the sensed line voltage relative to an acceptable voltage level, wherein the variation exceeds a first variation threshold. The method then includes the step of capturing a first waveform of the sensed line voltage corresponding to the time when the variation is detected. Finally, the method includes the steps of detecting a subsequent reduction in the variation of the magnitude of the sensed line voltage such that the variation is equal to or less than the first variation threshold and capturing a second waveform of the sensed line voltage corresponding to the time when the subsequent reduction in the variation is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.