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:
Oct. 17, 2006
Filed:
Jun. 27, 2003
Edmund O. Schweitzer, Iii, Pullman, WA (US);
Stanley E. Zocholl, Holland, PA (US);
Edmund O. Schweitzer, III, Pullman, WA (US);
Stanley E. Zocholl, Holland, PA (US);
Schweitzer Engineering Laboratories, Inc., Pullman, WA (US);
Abstract
A system used in a protective relay for motors for transitioning the value of the trip threshold to a motor start (stall) condition. The calculated transition trip threshold value follows It, specifically, the current to the motor. The transition trip threshold value includes a small fixed initial (offset) value, so that the increase in the trip threshold during transition to the actual start condition threshold value is always slightly ahead of the increase in the It value, preventing a trip until the input current exceeds the final trip threshold for the start condition.