Ronald H Carter

US Patent:

7865320, Jan 4, 2011

Filed:

Jun 25, 2008

Appl. No.:

12/145856

Inventors:

Avery Long - Madison AL, US
Ronald W. Carter - Murfreesboro TN, US

Assignee:

Square D Company - Palatine IL

International Classification:

G06F 19/00

US Classification:

702 61

Abstract:

A method of monitoring the electrical power in multiple branch circuits of an AC electrical power distribution system comprises monitoring at least one voltage common to said multiple branch circuits using a main meter unit, monitoring currents of the multiple branch circuits using multiple current cards that receive a plurality of current inputs from current transducers in the multiple branch circuits, sampling the monitored voltage in the main meter unit and the monitored currents in the current cards multiple times in each cycle of the AC power signal, determining the magnitudes and angles of spectral components of the sampled current in the current cards, sending data representing the magnitudes and angles of at least selected spectral components from the current cards to the main meter unit, and storing the voltage samples and the magnitudes and angles of at least the selected spectral components in the main meter unit.

US Patent:

8165834, Apr 24, 2012

Filed:

Jan 3, 2011

Appl. No.:

12/983530

Inventors:

Avery Long - Madison AL, US
Ronald W. Carter - Murfreesboro TN, US

Assignee:

Schneider Electric USA, Inc. - Palatine IL

International Classification:

G06F 19/00

US Classification:

702 61

Abstract:

A method of monitoring the electrical power in multiple branch circuits of an AC electrical power distribution system comprises monitoring at least one voltage common to said multiple branch circuits using a main meter unit, monitoring currents of the multiple branch circuits using multiple current cards that receive a plurality of current inputs from current transducers in the multiple branch circuits, sampling the monitored voltage in the main meter unit and the monitored currents in the current cards multiple times in each cycle of the AC power signal, determining the magnitudes and angles of spectral components of the sampled current in the current cards, sending data representing the magnitudes and angles of at least selected spectral components from the current cards to the main meter unit, and storing the voltage samples and the magnitudes and angles of at least the selected spectral components in the main meter unit.