SYSTEM AND METHOD FOR DETECTION OF WIRE BREAKAGE

摘要

A measuring system and a method for operating it to detect wire breakage based on the measured current or voltage in which the impedance of at least a first sensor is measured and the result transmitted to a connected system. The invention is capable of detecting wire breakage and sensor failure in temperature sensor systems simultaneous with the temperature measurement by the measuring system comprising an AC current source which generates an AC current that is transmitted through the wires, and through at least the first sensor, measuring system analyzing changes in the phase angle between the current and voltage of the AC signal. If the difference in the frequency of the signal affecting the impedance or voltage of the sensor, and the frequency of the injected wire testing signal is sufficiently high, it is possible to distinguish between the first measuring signals and the second wire testing signal.

主权项

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 at least one first censor (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 such as the impedance of at least the first sensor (5) which measuring system transmit the result (29) of the measurement of the parameter such as the impedance or the voltage to a connected system, wherein the measuring system comprises an AC current source (24), which AC current source (24) generates an AC current, which AC current is transmitted through the wires (1,2,3,4) and through at least the first sensor (5,8,21), which AC signal is analysed in the measuring system, which measuring system analyses changes in the phase angle between current and voltage of the AC signal, which measuring system by analyse of the phase angle detect wire breakage of at least one of the wires (1,2,3,4).