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AssigneeCommissariat a l'Energie Atomique
InventorsNicolas Ravot, Josy Cohen, Pascal Chambaud
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The invention relates to a method and a device for analyzing electric cables in a network, for the detection and location of defects in networks comprising at least one junction from which there depart N secondary cable stretches. The method includes interposing in the network, in series at the input of each the secondary stretches (T2, T3) starting from the junction (A), a respective bidirectional passive filter (FR2,FR3) able to cut off a frequency band associated with this stretch. The filters all allow through the useful frequencies for the normal operation of the network. A pulsed test is applied to the input of the network signal modulated by N different carrier frequencies each situated in one of the N frequency bands of the filters. The temporal position of test signal spikes reflected for each of the N frequencies is detected, and deducing therefrom the position of possible defects on a stretch of cable of the network.
A method of testing a network of electric cables comprising at least one junction from which there depart N secondary cable stretches (N greater than or equal to 2), wherein the method comprises:
A device for analyzing a network of electric cables comprising at least one junction from which there depart N secondary cable stretches (N greater than or equal to 2), comprising, in series at the input of each of N−1 secondary stretches starting from the junction, a bidirectional passive filter able to cut off a respective frequency band associated with this stretch, the filters allowing through all frequencies that are useful for the normal operation of the network, a generator of short duration test signal modulated simultaneously or successively by N−1 different carrier frequencies each situated in one of the N−1 frequency bands of the filters placed at the input of the stretches, the signal also being modulated by an Nth frequency situated outside the bands of the N−1 filters, and a device for detecting the temporal position of signal spikes arising from the reflection of the test signal, for each of the N frequencies.
Dependencies are inferred from the claim text.