Michael Joseph Devaney

US Patent:

6714881, Mar 30, 2004

Filed:

Aug 14, 2001

Appl. No.:

09/929325

Inventors:

David C. Carlson - Rockvale TN
Michael J. Devaney - Hallsville MO

Assignee:

Square D Company - Palatine IL

International Classification:

G06F 1900

US Classification:

702 61, 702125, 702187, 702189, 307 3, 307413, 307125, 708405, 708200, 700 14, 700 22, 324 98, 324110

Abstract:

A method for time reference compensation in a power metering system, the method comprising monitoring a time-dependent characteristic of incoming AC power over a predetermined local time interval, comparing the monitored characteristic over the predetermined local time interval with the expected value of the characteristic based upon the nominal frequency of the AC power, and calculating a correction to one or more of local real-time and time-based measurements of the power metering system, based on the comparing.

US Patent:

6727725, Apr 27, 2004

Filed:

May 1, 2001

Appl. No.:

09/846865

Inventors:

Michael J. Devaney - Hallsville MO
Levent Eren - Columbia MO

Assignee:

Square D Company - Palatine IL

International Classification:

G01R 3134

US Classification:

324772, 324545, 324 725

Abstract:

An apparatus and method for detecting motor bearing defects obtains motor current transient data during motor start-up, analyzes the motor current transient data via discrete wavelet transform, and compares the wavelet sub-bands to a baseline signature of a bearing-defect-free motor to detect bearing defects.