Gregory A Grisham

US Patent:

60207345, Feb 1, 2000

Filed:

Aug 1, 1997

Appl. No.:

8/905122

Inventors:

Gregory A. Grisham - West Lafayette IN
Gordon R. Burns - West Lafayette IN

Assignee:

Siemens Power Transmission & Distribution, Inc. - Wendell NC

International Classification:

G01R 1163
G01R 700
G01R 1900

US Classification:

324103R

Abstract:

An electrical utility meter includes a controller that determines a list of highest demands using event-triggered windows of time to ensure that only one of the entries on the list corresponds to any one high consumption event. The controller generates a demand value corresponding to the quantity of energy consumed within a demand interval, and then determines whether the demand value for the demand interval is greater than a smallest demand value on a list of highest demands in a memory location. If so, the controller opens a demand window, the demand window having a duration exceeding the demand interval. The controller then obtains a plurality of additional demand values for the duration of the demand window, each of the additional demand values corresponding to one of a plurality of additional demand intervals within the demand window. The controller records in the list of highest demands in the memory location a select one of the demand value and plurality of additional demand values. The select demand value may suitably be the largest demand in the window.

US Patent:

60436425, Mar 28, 2000

Filed:

Aug 1, 1997

Appl. No.:

8/905096

Inventors:

Warren T. Martin - Lafayette IN
William James Watson - Lafayette IN
Gregory A. Grisham - West Lafayette IN
Michael K. Anderson - West Lafayette IN
Randal K. Bond - West Lafayette IN

Assignee:

Siemens Power Transmission & Distribution, Inc. - Wendell NC

International Classification:

G01R 700
G01R 1163
G01R 522
G01R 138

US Classification:

324142

Abstract:

An electrical utility meter includes measurement error diagnostic capabilities with intelligent communication capabilities. In an exemplary embodiment, the present invention includes an electrical utility meter for measuring energy consumption by a load. The electrical utility meter includes, sensor circuitry, a conversion circuit, a communication circuit, and a controller. The sensor circuitry connects to a meter socket. The meter socket connects to a plurality of power lines that, in turn, connect the load to a source of electrical power. The source of electrical power provides power to the load in a plurality of phases. The sensor circuitry generates voltage and current measurement signals representative of the voltage and current waveforms on the plurality of power lines. The conversion circuit is connected to the sensor circuitry and generates a power consumption measurement, as well as measured phase angle data for the plurality of phases, all of which are generated based on the voltage and current measurement signals. The communication circuit is connected to a remotely located control device.