US 11,703,533 B2
Fault detection by multi-carrier time-domain reflectometery (MCTDR)
Emmanuel Bussy, Moissy-Cramayel (FR)
Assigned to SAFRAN ELECTRICAL & POWER, Blagnac (FR)
Appl. No. 17/439,164
Filed by SAFRAN ELECTRICAL & POWER, Blagnac (FR)
PCT Filed Mar. 16, 2020, PCT No. PCT/FR2020/050543
§ 371(c)(1), (2) Date Sep. 14, 2021,
PCT Pub. No. WO2020/188208, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 1902723 (FR), filed on Mar. 15, 2019.
Prior Publication US 2022/0163581 A1, May 26, 2022
Int. Cl. G01R 31/00 (2006.01); G01R 31/11 (2006.01)
CPC G01R 31/008 (2013.01) [G01R 31/11 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for detecting an electric arc in an electric line of an avionics system, said electric line being supplied by an AC voltage at a first frequency (f1), said AC voltage being composed of a succession of alternate half-periods,
said method includes a step of injecting a diagnosis signal into the electric line, the diagnosis signal being a MultiCarrier Time Domain Reflectometry, MCTDR, signal;
wherein the step of injecting comprises injecting the MCTDR signal into the electric line during an injection time window (ti) which is included in a half-period (t1) of the AC voltage and which is synchronized on the one hand to include a time of the said half-period at which an arc current is statistically potentially maximum and on the other hand to exclude part of the half-period at which the arc current is statistically less significant.