Abstract: A system for online monitoring of an assembly of electric cables (1) which are connected in series in an electrical distribution grid. The system has a central unit (2) located on a portion of the assembly and data acquisition units (3a, 3b, 3c) spread along the cables (1) at predefined positions. The system has subassemblies of measurement sensors (4a-1-4a-2, 4b-1-4b-4, 4c-1), the sensors of a subassembly being associated with the same acquisition unit and spread over a portion of the cables in the vicinity of the acquisition unit, the number and the type of sensors of a subassembly varying according to the position of the acquisition unit with which these sensors are associated and the size of the portion. Each acquisition unit is configured to receive and preprocess, under the command of the central unit, measurements originating from the sensors which are associated with it, and to transmit the preprocessed measurements to the central unit.

Abstract: An arrangement for synchronization between at least two data acquisition devices of an online monitoring system for monitoring an electrical distribution network, each located at a known point A or B in the network and configured to detect high-frequency events during data acquisition phases. During a first phase of estimating the period of the electrical signal travelling through the network, each data acquisition device samples the electrical signal travelling through the network and deduces therefrom an estimate T?A or T?B of the period of the electrical signal by detecting times of zero crossings of the sampled signal, which are locally timestamped by a timestamping means associated with each data acquisition device.

Abstract: A computer-implemented iterative method for reconstructing the topology of a cable network, includes the steps of: obtaining a measured time reflectogram Rm from a signal previously injected into the cable network, initially simulating a plurality of cable network hypotheses (Hi,j), and then iteratively executing the following steps: obtaining, for each simulated cable network hypothesis (Hi,j), an associated simulated time reflectogram Rm, evaluating, for each simulated cable network hypothesis (Hi,j), an error criterion E(Ri,j-Rm) between the measured time reflectogram Rm and the simulated time reflectogram Rm, applying, to the simulated cable networks, an optimization algorithm having the function of producing a plurality of modified cable networks having, overall, a reduced error criterion E(Ri,j-Rm), replacing the simulated cable networks from the previous iteration with the modified cable networks for the following iteration.

Abstract: A device (10) for monitoring the operation of a plurality of electrical cables, connection or coupling accessories, switchgear and transformers, included in a meshed electrical network, has a plurality of end branches (16) and a plurality of intermediate branches (14) comprises the meshed electrical network, at least two inductive sensors (12) suitable for detecting a partial discharge occurring in the meshed electrical network and a means (18) for locating the source of the partial discharge (PD).

Abstract: A method for characterizing a fault in a transmission line network, the method includes the steps of: obtaining a first measured time reflectogram Rm from a signal previously injected into the network, obtaining a second time reflectogram Rs corresponding to the network in the absence of faults, determining the time difference Rref between the first measured time reflectogram Rm and the second time reflectogram Rs, identifying, in the time difference Rref, an amplitude peak characterizing the presence of a fault and its time abscissa indicating the position of the fault, simulating a plurality of time reflectogram hypotheses each corresponding to the network comprising a fault at the identified position, each hypothesis being associated with a different value of at least one parameter characteristic of the fault, selecting the time reflectogram hypothesis closest to the time difference Rref.

Abstract: A method for characterizing a fault in a transmission line network, the method includes the steps of: obtaining a first measured time reflectogram Rm from a signal previously injected into the network, obtaining a second time reflectogram Rs corresponding to the network in the absence of faults, determining the time difference Rref between the first measured time reflectogram Rm and the second time reflectogram Rs, identifying, in the time difference Rref, an amplitude peak characterizing the presence of a fault and its time abscissa indicating the position of the fault, simulating a plurality of time reflectogram hypotheses each corresponding to the network comprising a fault at the identified position, each hypothesis being associated with a different value of at least one parameter characteristic of the fault, selecting the time reflectogram hypothesis closest to the time difference Rref,

Abstract: A method for characterizing a fault in a network of at least one transmission line, the method includes the steps of: injecting a first reference signal into the network, acquiring a first measurement of the first reference signal after its propagation in the network, temporally reversing the measurement to generate a second reference signal, injecting the second reference signal into the network, acquiring a second measurement of the second reference signal after its propagation in the network, calculating the intercorrelation between the second measurement and the second reference signal.

Abstract: A computer-implemented iterative method for reconstructing the topology of a cable network, includes the steps of: obtaining a measured time reflectogram Rm from a signal previously injected into the cable network, initially simulating a plurality of cable network hypotheses (Hi,j), and then iteratively executing the following steps: obtaining, for each simulated cable network hypothesis (Hi,j), an associated simulated time reflectogram Rm, evaluating, for each simulated cable network hypothesis (Hi,j), an error criterion E(Ri,j-Rm) between the measured time reflectogram Rm and the simulated time reflectogram Rm, applying, to the simulated cable networks, an optimization algorithm having the function of producing a plurality of modified cable networks having, overall, a reduced error criterion E(Ri,j-Rm), replacing the simulated cable networks from the previous iteration with the modified cable networks for the following iteration.