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. 08, 1996
Filed:
Oct. 23, 1995
Eric J Beltz, Westerville, OH (US);
Robert C Carruth, Worthington, OH (US);
Stanley K Farlow, Lewis Center, OH (US);
Eugene L Fromholtz, deceased, late of Pickering, OH (US);
AEP Energy Services, Inc., Columbus, OH (US);
Abstract
A method and system for indicating the position of a nuclear reactor control rod which is suspended from a shaft sliding vertically inside a travel housing. Primary and secondary coils are wound around the travel housing and an AC current travelling through the primary coil induces a secondary voltage across the secondary coil and a primary voltage across a secondary coil of an isolation transformer. The primary and secondary AC voltages are low pass filtered, rectified into DC voltages, and low pass filtered a second time. The secondary DC voltage is divided by the primary DC voltage and a ratiometric signal is produced. The ratiometric signal is compensated by decoupled zero and span adjustments and by a temperature compensation adjustment. A linear correction offset is calculated from data stored in an EPROM and summed with the ratiometric signal yielding a module output signal which is a linear representation of the control rod position.