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:
Jun. 23, 2009
Filed:
Jul. 02, 2007
William Davison, Cedar Rapids, IA (US);
David Joseph Dunne, Cedar Rapids, IA (US);
Kevin John Malo, Iowa City, IA (US);
Steve M. Meehleder, Cedar Rapids, IA (US);
Richard Allen Studer, Ii, Wesley, IA (US);
William Davison, Cedar Rapids, IA (US);
David Joseph Dunne, Cedar Rapids, IA (US);
Kevin John Malo, Iowa City, IA (US);
Steve M. Meehleder, Cedar Rapids, IA (US);
Richard Allen Studer, II, Wesley, IA (US);
Other;
Abstract
A motor circuit protector that trips in accordance with an instantaneous trip curve that is split into three protection regions, a self-protection region, an in-rush avoidance region, and a locked-rotor avoidance region. Software modules for detecting whether primary current exceeds each region are run in parallel or simultaneously, providing redundant instantaneous trip detection, and these redundant protection regions remain active throughout the startup and steady-state modes of operation of the motor circuit protector. This redundancy provides improved time current trip performance for a wide variety of short circuit conditions and improved system safety properties are realized. The current threshold for the self-protection region can be adjusted toward the in-rush avoidance region once steady-state operation is achieved. In startup mode, only the self-protection region may be detected, but can remain active during steady-state mode.