Abstract: 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.

Abstract: A method for detecting a hot spot at a connector (2) arranged on an electrical line, a heat-sensitive impedance module (4, 4a, 4b, 4c) being arranged at the connector (2), the electrical line and the heat-sensitive impedance module having an overall heat-sensitive impedance, the method comprising the following steps: determining a physical characteristic that is a function of said overall heat-sensitive impedance, and if said physical characteristic deviates from a predetermined reference value, emitting an alarm for detecting and locating a hot spot at said connector.

Abstract: 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.

Abstract: A method uses at least: one line made up of at least two conductors insulated by a material whose insulation impedance depends locally on the temperature, the line running through the installation; a reflectometer periodically transmitting a reflectometry signal at one end of the line, the signal being propagated along the line, the reflectometer measuring the echoes received and comparing the amplitudes of the echoes with a given reference; a hot spot being detected when the amplitudes of a given number of successive echoes are greater than the given reference, the echoes being provoked by a local reduction of the value of the insulation impedance.

Abstract: The device comprises at least a first part intended to detect an electrical fault occurring in a network and a second part comprising at least one switch connecting the network to a power supply source, the first part comprising at least one reflectometry detection system capable of being coupled with the network, the system detecting and analyzing the impedance changes occurring in the network, a signal being sent by the system to trigger the opening of the switch when a detected impedance change is considered by the system to be an electrical fault.

Abstract: A method uses at least: one line made up of at least two conductors insulated by a material whose insulation impedance depends locally on the temperature, the line running through the installation; a reflectometer periodically transmitting a reflectometry signal at one end of the line, the signal being propagated along the line, the reflectometer measuring the echoes received and comparing the amplitudes of the echoes with a given reference; a hot spot being detected when the amplitudes of a given number of successive echoes are greater than the given reference, the echoes being provoked by a local reduction of the value of the insulation impedance.

Abstract: The device comprises at least a first part intended to detect an electrical fault occurring in a network and a second part comprising at least one switch connecting the network to a power supply source, the first part comprising at least one reflectometry detection system capable of being coupled with the network, the system detecting and analyzing the impedance changes occurring in the network, a signal being sent by the system to trigger the opening of the switch when a detected impedance change is considered by the system to be an electrical fault.

Abstract: A multi-carrier reflectometry device and method for on-line diagnosis of at least one transmission line. The device includes: a transmission part that includes successively: a module for parameterizing a test signal SF, such that: sF=[0,c1ej?1,c2ej?2, . . . ,CN/2-1ej?N/2-1,CN/2,CN/2-1ej?N/2-1,cN/2-2ej?N/2-2, . . . ,c1ej?1]T, a module for synthesizing the test signal by inverse discrete Fourier transform, and a digital to analog converter, connected to the line; and a detection part that includes successively: an analog to digital converter connected to this transmission line, a discrete Fourier transform module, and an analysis module containing a deconvolution module, which also receives the test signal sF.

Abstract: A multi-carrier reflectometry device and method for on-line diagnosis of at least one transmission line. The device includes: a transmission part that includes successively: a module for parameterizing a test signal SF, such that: sF=[0, c1ej?1, c2ej?2, . . . , CN/2-1ej?N/2-1, CN/2, CN/2-1ej?N/2-1, cN/2-2ej?N/2-2, . . . , c1ej?1]T, a module for synthesising the test signal by inverse discrete Fourier transform, and a digital to analog converter, connected to the line; and a detection part that includes successively: an analog to digital converter connected to this transmission line, a discrete Fourier transform module, and an analysis module containing a deconvolution module, which also receives the test signal sF.