Monitoring system of wind-induced motion or vibration in at least one overhead cable, in particular a conductor aerial cable of a transmission or distribution

摘要

The present invention relates to a monitoring system of wind-induced motion or vibration in at least one overhead cable (102), in particular a conductor aerial cable (102) of a transmission or distribution electric line. The monitoring system comprises: at least three sensor nodes (104) adapted to be installed in positions different from each other on a first overhead cable (102) and configured for detecting the motion or vibration through a synchronous signal acquisition. Each of the at least three sensor nodes (104) comprises a respective triaxial accelerometer sensor (301) configured for acquiring a first node signal and a first processor (302) configured for identifying, in the first node signal, a maximum node amplitude and an associated node frequency through a spectral analysis of the first node signal. The monitoring system further comprises a processing unit (105) operatively associable with the at least three sensor nodes (104) and comprising a second processor (401) configured for comparing to each other at least three maximum node amplitudes respectively of the at least three sensor nodes (104), for identifying a selected maximum amplitude and an associated selected frequency, the selected maximum amplitude being the maximum of the at least three maximum node amplitudes. The respective triaxial accelerometer sensor (301) in each of the at least three sensor nodes (104) is further configured for acquiring a second node signal. The first processor (302) is further configured for identifying, in the second node signal, a node selected amplitude and an associated node selected phase through a spectral analysis of the second node signal, the node selected amplitude and the node selected phase being associated with the selected frequency. The second processor (401) is further configured for calculating a numerical model based on at least three node selected amplitudes and associated at least three node selected phases, for all of the at least three sensor nodes (104), for reconstructing the motion or vibration in any point of the at least one overhead cable (102) according to the selected frequency. The present invention also relates to a related monitoring method and related sensor node.