The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 2009
Filed:
May. 31, 2005
Fred J. Rapant, South Milwaukee, WI (US);
Richard J. Kaluzny, Greenfield, WI (US);
Donald A. Down, Brookfield, WI (US);
Augusto D. Hernandez, Jr., Legal Representative, New Berlin, WI (US);
Fred J. Rapant, South Milwaukee, WI (US);
Richard J. Kaluzny, Greenfield, WI (US);
Donald A. Down, Brookfield, WI (US);
Augusto D. Hernandez, Jr., legal representative, New Berlin, WI (US);
Cooper Technologies Company, Houston, TX (US);
Abstract
A preventive maintenance tapping technique includes noting a tap position of a load tap changer and noting a duration that the tap position has been held. The duration that the tap position has been held is compared to a threshold value, and the tap position is changed if the tap position has been held for longer than the threshold value. Similarly, a duty cycle monitoring technique for monitoring life of load tap changer contacts includes detecting an arcing event. Arcing surfaces involved in the arcing event are identified and the effects of the arcing event on the arcing surfaces are calculated. Estimates of the erosion on the arcing surfaces are updated, and the estimates are compared to a threshold value. A signal for maintenance is generated when the estimate exceeds the threshold value.