Paul Floyd Griffin

US Patent:

6429785, Aug 6, 2002

Filed:

Jan 8, 1999

Appl. No.:

09/226957

Inventors:

Paul M. Griffin - Charlotte NC
Guy H. Berthiaume - Charlotte NC

Assignee:

Siemens Power Transmission Distribution Inc. - Wendell NC

International Classification:

G08B 2300

US Classification:

34087002, 340661, 702 61

Abstract:

An electrical energy meter includes a voltage digitizing circuit, a current digitizing circuit, a metering circuit, a clock circuit, and a source of externally-generated time standard information. The voltage digitizing circuit is operable to obtain analog line voltage information and generated digital line voltage information therefrom. Similarly, the current digitizing circuit is operable to obtain analog line current information and generate digital line current information therefrom. The metering circuit is operable to receive the digital line voltage information and the digital line current information and generate metering information therefrom. The clock circuit is operable to generate calendar/clock information, said clock circuit having a calibration input for receiving precision time calibration information. The source of externally-generated time standard information is operably coupled to provide precision time calibration information to the calibration input of the clock circuit.

US Patent:

6667692, Dec 23, 2003

Filed:

Jun 29, 2001

Appl. No.:

09/897791

Inventors:

Paul M. Griffin - Charlotte NC

Assignee:

Landis+Gyr Inc. - Lafayette IN

International Classification:

G08B 2100

US Classification:

340658, 340661, 340662

Abstract:

An electrical utility meter having harmonic data templates advantageously enables a user to determine whether equipment at a particular site is susceptible to electrical damage or interference. According to an exemplary embodiment, the meter generates measured harmonic data for a plurality of phases in the polyphase electrical system. A user may select at least one of a plurality of predetermined templates including one or more harmonic data thresholds. Each of the predetermined templates corresponds to a condition where a specific device is susceptible to electrical damage or interference. The measured harmonic data is compared with the one or more harmonic data thresholds included in the at least one selected predetermined template. An alarm is generated when the measured harmonic data exceeds the one or more harmonic data thresholds included in the at least one selected predetermined template. According to a preferred embodiment, the alarm is generated in dependence upon the specific template whose one or more harmonic data thresholds are exceeded.