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1. (WO2014193495) WIRELESS TRANSPONDER UNIT, ELECTRICAL JOINT MONITORING SYSTEM INCLUDING THE SAME, AND METHOD OF MONITORING ELECTRICAL JOINTS

Pub. No.:    WO/2014/193495    International Application No.:    PCT/US2014/016765
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Wed Feb 19 00:59:59 CET 2014
IPC: G06K 19/07
Applicants: EATON CORPORATION
Inventors: SHEA, John Joseph
CARRODUS, Jason B.
Title: WIRELESS TRANSPONDER UNIT, ELECTRICAL JOINT MONITORING SYSTEM INCLUDING THE SAME, AND METHOD OF MONITORING ELECTRICAL JOINTS
Abstract:
A wireless transponder unit (10") having a maximum operating temperature and being structured to be disposed on an electrical joint (2) includes: an integrated circuit (12) configured to store identification information; and a resonant circuit (14,15,17) electrically connected to the integrated circuit, the resonant circuit having a damping factor. The resonant circuit includes a capacitor (14), an antenna (15), and a resistor (17) having a resistance and a positive thermal coefficient. A change in temperature of the wireless transponder unit causes a change in the resistance of the resistor and the damping factor of the resonant circuit. The maximum operating temperature of the wireless transponder unit is based on the damping factor of the resonant circuit.