公开(公告)号：US20240426892A1

公开(公告)日：2024-12-26

申请号：US18673294

申请日：2024-05-23

Applicant: NEXANS

Inventor： Moussa KAFAL ,  Samuel GRIOT

IPC: G01R31/08

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. One of the devices then sends an information signal at a first time of detection tZCA1,1, which is locally timestamped, of a new zero crossing of the sampled signal, and triggers a data acquisition phase at a first time TRA separated from the first time of detection by a duration corresponding to the first estimate T′A of the period of the electrical signal. The time of reception of this signal at the other device is also timestamped by a local timestamping means. After a duration corresponding to half the second estimate T′B of the period of the electrical signal following the time of reception has elapsed, this other device triggers a phase of acquiring high-frequency events over a plurality of successive cycles having a predefined cycle duration, at a second triggering time tRB determined locally and corresponding to a second time of detection of a new zero crossing of the locally sampled signal. It is then possible to determine a synchronization difference Δtoa between two high-frequency events acquired, over a given cycle, by the two data acquisition devices by calculating the difference between the second triggering time tRB and the first triggering time tRA.

公开(公告)号：US20250052804A1

公开(公告)日：2025-02-13

申请号：US18763657

申请日：2024-07-03

Applicant: NEXANS

Inventor： Moussa KAFAL ,  Samuel GRIOT ,  Aymeric ANDRE ,  Olivier PINTO

IPC: G01R31/08

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.

公开(公告)号：US20230384358A1

公开(公告)日：2023-11-30

申请号：US18138622

申请日：2023-04-24

Applicant: NEXANS

Inventor： Samuel GRIOT ,  Dimitri CHARRIER ,  Moussa KAFAL

IPC: G01R31/08

CPC classification number: G01R31/086

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).