Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Wafa Ben Hassen

Antoine Dupret

Suzanne Lesecq

Diego Puschini Pascual

Fabrice Auzanneau

Nicolas Ravot

Julien Mottin

Cyril Chastang

Miguel Gallego Roman

Moussa Kafal

Armando Zanchetta

Marie-Bénédicte Jacques

A system for monitoring the state of a cable, includes a plurality of reflectometry devices able to inject a test signal at a point of injection into the cable and to measure a signal having propagated back through the cable to the point of injection into the cable, the reflectometry devices being intended to be positioned along the cable so as to divide the cable into successive segments, the system comprising a control unit that is able to communicate with the reflectometry devices and that is configured so as to carry out at least one reflectometry test consisting in injecting a test signal into the cable by means of a first reflectometry device and measuring the test signal, by means of the first reflectometry device, after it has propagated through the cable and been reflected from an impedance discontinuity, the system further comprising a post-processing unit able to communicate with the reflectometry devices and configured to analyze the measurement of the test signal with a view to detecting an amplitude peak corresponding to a fault.

System for monitoring the state of a cable through distributed reflectometry

A method for characterizing a fault in a transmission line network, the method includes the steps of: obtaining a first measured time reflectogram Rfrom a signal previously injected into the network, obtaining a second time reflectogram Rcorresponding to the network in the absence of faults, determining the time difference Rbetween the first measured time reflectogram Rand the second time reflectogram R, identifying, in the time difference R, an amplitude peak characterizing the presence of a fault and its time abscissa indicating the position of the fault, simulating a plurality of time reflectogram hypotheses each corresponding to the network comprising a fault at the identified position, each hypothesis being associated with a different value of at least one parameter characteristic of the fault, selecting the time reflectogram hypothesis closest to the time difference R.

Method for characterising a fault in a transmission line network with unknown topology

A method for detecting soft faults in a transmission line includes the following steps: acquiring a measurement, called time-domain reflectogram, of a signal characteristic of the reflection of a reference signal previously injected into the line, determining the difference between the time-domain reflectogram and a time-domain reflectogram measured previously for the same line or an identical line of similar characteristics, in order to obtain a corrected time-domain reflectogram, applying a plurality of independent transformations to the corrected time-domain reflectogram in order to obtain a plurality of independent transformed reflectograms, converting the transformed reflectograms into a plurality of mutually independent probabilities of occurrence of a fault, applying a data merging method to the probabilities of occurrence of a fault to deduce therefrom a unified value of the probability of occurrence of a fault.

Method for detecting soft faults in a cable by data fusion

A method for generating a reflectometry signal for the diagnosis of defects impacting a transmission line or a network of transmission lines, the method executed by a diagnosis device belonging to a distributed system comprising a plurality of diagnosis devices connected to the line or network of lines, the method comprises the following steps: Generating an electrical signal comprising a plurality of frequency carriers regularly dispersed within a frequency band subdivided into sub-carriers so that each device of the distributed system uses different sub-carriers from the other devices of the system; injecting the electrical signal into the line or network of lines.

Method for generating a multi-carrier reflectometry signal for implementation in a distributed system

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Paris, France

Wafa Ben Hassen