Abstract: A DC high voltage cut-off device includes at least one cut-off module, having: a main cut-off apparatus in a main branch, a general surge protector in an absorption branch, and a changeover branch, with at least one changeover capacitor wherein: a first plasma tube switch in the changeover branch, a pre-charge circuit of the changeover capacitor, a changeover surge protector, in parallel with the changeover capacitor, and having a protection voltage lower than a nominal operating voltage of the cut-off module and, by at least one pilotable switch which supplies the first plasma tube switch with a voltage derived from an electric voltage between the armatures of the changeover capacitor.

Abstract: A method for controlling an electrical transmission network including a plurality of DC high-voltage lines and at least three AC/DC converters identified by a respective index i. For each of the converters having index i, the method includes recovering the setpoint active power value Pdci applied thereto, and recovering instantaneous voltage value Vi and voltage angle value ?i of the buses having index i and modifying the setpoint active power Pdci of each of the converters having index i by a value including a term ?Pdcsi as a function of a sum of deviations of voltage angles multiplied by contribution adjustment parameters.

Abstract: A method for monitoring a system for transmitting electrical power for a network for transmitting DC electrical power. The method involves determining, along a measurement segment, a profile of a temperature parameter, determining a theoretical leakage current between the grounding connections of the measurement segment, taking into account the temperature parameter profiles and the load current and voltage, measuring the leakage current between the grounding connections of the measurement segment, and generating an alert if there is a difference between the theoretical and measured leakage current.

Abstract: The invention relates to an electrically insulating composite material (1) comprising a polyepoxide matrix (2) of cycloaliphatic type or of diglycidyl ether type in a content of less than 40% by mass, from 20 to 75% by mass of one or several micrometric and/or mesometric filler(s) (3), and from 0.1 to 20% by mass of at least one ionic liquid (4), the masses being expressed relative to the total mass of the electrically insulating composite material (1). The invention also relates to a method for manufacturing such an electrically insulating composite material (1), as well as its use for an electrically insulating support (9) in a metal-enclosed substation (5).

Abstract: A method for controlling an electrical transmission network including a plurality of DC high-voltage lines and at least three AC/DC converters which are identified by a respective index i and are interconnected by the DC high-voltage lines. Each of the AC/DC converts are connected to an AC voltage bus identified by a respective index i as well as to one of the DC high-voltage lines.

Abstract: The invention relates to a transient based method for identifying faults in an electric power transmission and/or distribution system (100) having at least one current transmission line (L12, L13, L23) comprising the following steps: —generation of a physical model of the at least one current transmission line (L12, L13, L23), the physical model depending on the fault parameters and describing the behavior of voltage and/or current transients due to the fault in the at least one current transmission line, fault parameters comprising a fault location parameter on said current transmission line (L12, L13, L23) and a fault impedance parameter, —measurement of voltage and/or currents evolution at least at one specific location in the said power system (100), —iterative simulation of the voltage and/or current evolution by the physical model at the measurement point with a set of fault parameters where at each step of iteration, simulated and measured voltage and/or current evolutions are compared and the set of f

Abstract: An induction-controlled switch having a vacuum bulb comprising a vacuum chamber and a switch comprising first and second electrodes. The first switch comprising first and second electrodes and further having a first actuator slidably mounted in a first direction and rigidly attached to the first electrode. The first actuator comprising a first armature. A second actuator comprising a second armature. A first control member comprising a first coil configured to simultaneously generate a switching current in the first armature and a current in the second armature via the first coil, so as to separate or bring into contact the first and second electrodes and so as to move the first and second actuators in opposite ways along the first direction.

Abstract: A superconducting current limiting dipole (L6), comprising a superconducting conductor (F6) wound so as to form a two-wire coil extending in a single plane, a layer of insulator (E1 to E11, H1) being arranged between two turns of said coil. The superconducting conductor (C1 to C6) consists of at least four separate superconducting cables (C1 to C6) wound in parallel and arranged in at least two pairs, each of the pairs being formed by two of said superconducting cables (C1 to C6) that are electrically connected to one another in a first connection area, and, in a second connection area, one of the superconducting cables of one pair is electrically connected to one of the superconducting cables of the other pair, the other superconducting cable of each pair being connected to an electrical connection terminal (T1, T2) or to an additional pair.

Abstract: The invention relates to a method for controlling an energy production system (1), comprising: —a connecting link (6) provided with a connection (62) to an AC network (2); —a turbine system (3) comprising an electric machine (31) for delivering a nominal electrical power Pnom; —an energy storage system (14), comprising the following steps; —receipt of a first electrical power setpoint Ps0 and control of the turbine system (3) so as to deliver an electrical power Pt0=Ps0; and —receipt of an electrical power setpoint Ps1, where ?Ps=Ps1?Ps0 and |?Ps|>Pnom*0.3; a) application of a hydraulic setpoint to the turbine system (3) so as to increase the delivered electrical power Pti thereof and prevent the storage system (14) from delivering electrical power (62); b) determination of the power Pea that the storage system (14) is able to supply; c) when Pti+Pea?Ps1??1, the storage system (14) delivers an electrical power Pe1 to satisfy the requirement Ps1??1?Pe1+Pti?Ps1+?2.

Abstract: A superconducting current limiter having at least one superconducting conductor (3) wound so as to form a coil (2) extending in a single plane and connecting a first electrical connection terminal to a second electrical connection terminal, an electrically insulating spacer (8) being arranged between two turns of the coil. The superconducting conductor (3) consists of at least two separate superconducting cables (5) wound in parallel and whose ends are electrically connected by the first electrical connection terminal and by the second electrical connection terminal, respectively. An electrically conductive spacer (12) is arranged between two of said separate superconducting cables (5), this electrically conductive spacer (12) being able to be traversed by a cooling fluid.

Abstract: A current cut-off device for high-voltage direct current, includes: at least one primary mechanical switch placed in a main line between a primary point and a secondary point; a primary surge arrester arranged in parallel with the primary switch; and an oscillatory circuit arranged electrically in parallel with the primary switch and electrically in parallel with the primary surge arrester. The oscillation circuit includes, electrically in series, at least an inductance, a capacitance and an oscillation trigger. The device has, in the oscillation circuit, a controllable device for varying the resistance value inserted in series into the oscillation circuit.

Abstract: A method for monitoring a system for transmitting electrical power for a network for transmitting DC electrical power. The method involves determining, along a measurement segment, a profile of a temperature parameter, determining a theoretical leakage current between the grounding connections of the measurement segment, taking into account the temperature parameter profiles and the load current and voltage, measuring the leakage current between the grounding connections of the measurement segment, and generating an alert if there is a difference between the theoretical and measured leakage current.

Abstract: A current cut-off device for high-voltage DC current includes: between a primary point and an intermediate point, a primary diversion member and, in parallel, a primary surge protector; a secondary mechanical switch between the intermediate point and the secondary point; a main resonator whose terminal is linked to the secondary point; a main oscillation switch; a main surge protector, in parallel with a main capacitance of the main resonator; wherein the main oscillation switch includes three terminals linked respectively to the primary point, to the intermediate point and to the other terminal of the main resonator; the changeover switch can switch at least between three direct, inverting and isolated states.

Abstract: A high-voltage direct current cut-off device, includes: a primary mechanical switch and a secondary mechanical switch placed successively between a primary point and a secondary point but either side of an intermediate point, a primary surge arrester arranged parallel with the primary switch, a secondary surge arrester arranged electrically parallel with the secondary switch. The secondary surge arrester is arranged electrically between the intermediate point and the secondary point, and in that the device comprises a capacitive buffer circuit electrically in parallel with the assembly formed by the primary switch and the secondary switch, and electrically in parallel with the assembly formed by the primary surge arrester and the secondary surge arrester, wherein the capacitive buffer circuit comprises an activation switch and a buffer capacitance.

Abstract: An energy production system including a hydraulic turbine system having undesirable electrical power output setpoints and identified safe electrical power output setpoints, an energy storage system, a connection connected to the energy storage system and to an electric machine of the hydraulic turbine system, and further connected to an AC power network, a device for determining the state of charge, a control circuit controlling a transfer of electrical power between the connection and the energy storage system, configured to receive an electrical power setpoint value (Reps) and configured to determine that this received electrical power setpoint value belongs to the undesirable electrical power output setpoint values to generate an electrical power transfer setpoint value (Epts), and an actual electrical power output setpoint value (Aepos) belonging to the safe electrical power output setpoint values, satisfying the relationship Reps=Epts+Aepos.

Abstract: A power transfer system includes a first branch including a controlled switch and a second branch including a variable frequency converter, in parallel between an AC network and a reversible pump-turbine, the variable frequency converter includes: a first AC/DC converter having a first DC interface, and a second AC/DC converter having a second DC interface, the first and second DC interfaces being connected by a DC link, a control circuit having a first mode wherein it simultaneously opens the switch and it transfers electrical power until it reaches the same frequency on two AC interfaces, and having a second mode wherein it closes the switch of the first branch; an energy storage system; and a switching system for selectively connecting the energy storage system to the DC link.

Abstract: Disclosed is a device for controlling a terminal connected in a multi-terminal high-voltage direct current transmission facility, the terminal being able to provide or draw power on the DC part of the facility comprised between an upper power limit and a lower power limit, the device further comprising at least one regulation circuit configured to vary the power provided or drawn by the terminal on the DC part of the facility, as a function of a voltage variation on the DC part of the facility, the device further comprising a limitation circuit configured to limit the variation of the power provided or drawn by the terminal, for a given voltage variation, when the power difference between the power provided or drawn by said terminal and the upper power limit or the lower power limit becomes smaller than a determined value.

Abstract: The invention relates to a method for controlling an electrical transmission link (3) between first and second AC voltage buses (11, 21) comprising a high-voltage DC line (320), first and second AC/DC converters (321, 322) connected to the high-voltage DC line (320), comprising: retrieving a setpoint active power value (Pdc0) applied to a converter (321, 322); retrieving the instantaneous values V1 and V2 of the voltages on the first and second buses; wherein the setpoint active power of the first or of the second converter is modified by a value including a term ?Pdc, so as to impose new dynamics on the first and second areas, where: ?Pdc=?Pdcs+?Pdca.

Abstract: The invention relates to an electrically insulating composite material (1) comprising a polyepoxide matrix (2) of cycloaliphatic type or of diglycidyl ether type in a content of less than 40% by mass, from 20 to 75% by mass of one or several micrometric and/or mesometric filler(s) (3), and from 0.1 to 20% by mass of at least one ionic liquid (4), the masses being expressed relative to the total mass of the electrically insulating composite material (1). The invention also relates to a method for manufacturing such an electrically insulating composite material (1), as well as its use for an electrically insulating support (9) in a metal-enclosed substation (5).

Abstract: A power flow control device intended to be used in a mesh network. The device includes a first voltage source connected between a first terminal (B1) and a third terminal (B3). A second voltage source is connected between a second terminal (B2) and the third terminal (B3). A current source is connected alternately to the first voltage source and the second voltage source and configured to ensure a transfer of energy between the first voltage source and the second voltage source. A switching means is arranged to allow the current source to be connected alternately in parallel with the first voltage source or in parallel with the second current source.