METHOD AND DEVICE FOR ANALYSING ELECTRIC CABLE NETWORK USING PSEUDORANDOM SEQUENCES

摘要

The present invention relates to a method and a device for analysing electric cable networks in order to detect and locate defects in cables comprising at least one branching from N secondary sections extend. The method involves injecting into the network at a plurality of injections points Ei pseudo-random sequences of digital signals Pni(t) that are de-correlated from each other, and collecting at one or more observation points Sj the composite time signals Rj(t) generated by the circulation of the outputted sequence and the reflection thereof in the network impedance discontinuity. The method further comprises computing the correlation between the composite signals and the time-offset pseudo-random sequences and searching for the positions of correlation peaks in order to derive the location of the defects in the network while taking into account the signal propagation speed in the network.