Patent ID: 9599652
Date: 2017-03-21
CPC Classifications: G01K,G01R

Claim:
1. System for wire breakage detection adapted for detection of wire breakage in measuring systems connected to at least one first sensor ( 5 , 8 , 21 ), which sensor ( 5 , 8 , 21 ) is connected to a measuring system by at least two wires ( 1 , 2 , 3 , 4 ), which measuring system comprises a current source ( 7 ), which current source ( 7 ) is generating a current in the wires ( 2 , 3 ) and through the at least one first sensor ( 5 , 8 , 21 ), which current is detected in the measuring system, which measuring system, based on the measured current or voltage, generates at least a first parameter of at least the first sensor ( 5 ), the measuring system being adapted to transmit the result ( 29 ) of the measurement of the parameter to a connected system, wherein the measuring system comprises an AC current source ( 24 ), which AC current source ( 24 ) is adapted to generate an AC current and to transmit the AC current through the wires ( 1 , 2 , 3 , 4 ) and through at least the first sensor ( 5 , 8 , 21 ), the measuring system being adapted to analyze the AC signal and analyze changes in the phase angle between current and voltage of the AC signal, and wherein the measuring system is adapted to provide an indication that at least one of the wires has broken in response to the analysis of the phase angle indicating that the phase difference between the current generated by the AC source and the measured AC voltage has changed, a phase difference between the AC current and the measured voltage of 90° providing said indication that at least one of the wires has broken and a phase difference between 0° and 90° providing an indication that no wire breakage has occurred.