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1. (WO2018077943) SYSTEM AND METHOD FOR MONITORING CIRCUIT BREAKERS

Pub. No.:    WO/2018/077943    International Application No.:    PCT/EP2017/077294
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Thu Oct 26 01:59:59 CEST 2017
IPC: H01H 11/00
Applicants: ABB SCHWEIZ AG
ABB (CHINA) LIMITED
Inventors: ROBY, David
ORMAN, Maciej
LI, Shunchong
MARINKOVIC, Stevan
MARET, Yannick
Title: SYSTEM AND METHOD FOR MONITORING CIRCUIT BREAKERS
Abstract:
System (1) and method for monitoring a travel curve of moving part (6) of circuit breaker (5) comprising: device (17) for optically monitoring travel path and comprising: light source (12); light detection device (15); optical element (10) having plurality of zones with different optical properties which are alternately arranged, the optical element (10) being provided on moving part (6) of circuit breaker (5), light being intensity-modulated by the optical element (10) and being received by light detection device (15) during circuit breaker operation. The system (1) further comprises an accelerometer (8) mounted to circuit breaker (5), control unit (18) for receiving signals from light detection device (15) and from accelerometer (8), the control unit (18) being configured to determine the travel curve based on the detected modulated light and on the detected vibration signal, the vibration signal being employed to identify a change of direction of movement of the moving part (6).