Commissariat a L'energie Atomique Et Aux Energies Alternatives

Safran Electrical & Power

Raphaël Toufflet

Diego Alberto

Vincent Heiries

Emmanuel Bussy

Marco Ranieri

Christophe Trebosc

A method for detecting and locating a fault affecting an electrical cable includes the steps of (a) placing a first sensor and a second sensor along the cable, the second sensor being an acoustic sensor; (b) detecting the occurrence of the fault with the first sensor at a first time, and with the second sensor at a second time; (c) taking into account a propagation speed of an acoustic wave generated by the fault; (d) estimating a position of the fault depending on the first time and on the second time, on the basis of the propagation speed resulting from step (c); (e) determining a reference propagation speed depending on the position resulting from step (d) of the fault, and comparing said reference propagation speed with the propagation speed taken into account in step (c); and, (f) depending on the comparison, validating the position resulting from step (d) or reiterating steps (c) to (f) while adjusting, in step (c), the propagation speed taken into account.

Method for detecting a fault occurring in a cable

The invention relates to a device for detecting an electric arc based on an analog output signal () of at least one acoustic wave sensor (), this device including: an analog-to-digital converter () capable of sampling and digitizing the output signal () of the sensor (); a digital processing circuit () capable of implementing a frequency domain analysis of the digital output signal () of the converter () enabling to detect the possible presence of an arc based on its acoustic signature; and an analog circuit () for detecting the exceeding of a power threshold by the output signal () of the sensor (), wherein the digital processing circuit () is configured to implement the frequency domain analysis only on detection of the exceeding of a threshold by the analog circuit ().

Device for detecting an electric arc based on its acoustic signature

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Grenoble, France

Raphaël Toufflet