Safran Electrical & Power

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

Win Ms

Emmanuel Bussy

Vincent Heiries

Diego Alberto

Marc Olivas

Raphaël Toufflet

Christophe Trebosc

Sylvain Poignant

Patrick Depras

Soumaya Sallem Andasmas

The invention relates to a method for detecting and locating a fault by reflectometry in an electrical circuit, such a method comprising the steps of: —emitting a reflectometry signal in a line of the circuit to be studied; —acquiring an electrical variable of the reflected signal passing through the network; —filtering the acquired signal so as to eliminate signals having a frequency lower than a cutoff frequency, the cutoff frequency having a value between 100 kHz and 1 GHz; —analysing an acquired signal so as to detect a fault.

Method for arc detection by multi-carrier reflectometry (MCTDR)

The invention relates to a method for detecting events by reflectometry in an electrical line of an avionic system, said line being fed with an AC voltage at a first frequency (f1), said AC voltage being sinusoidal and composed of a succession of alternate half-periods, said method comprising a step of injecting a reflectometry signal into the network, the reflectometry signal having a second frequency (f2) higher than the first frequency (f1); wherein the injecting step is synchronized with the AC voltage, the injecting step being carried out by injecting the reflectometry signal into the network during an injection duration (ti) comprised between the start and end of a half-period (t1) of the AC feed voltage.

Fault detection by multi-carrier time-domain reflectometery (MCTDR)

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

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Blagnac, France

Emmanuel Bussy