Abstract: The invention provides a voltage sensor for a very high-voltage direct current line comprising two voltage divider stages connected in series, the sensor being characterized in that a first voltage divider stage (E1) that divides the very high voltage to an intermediate voltage is constituted by at least two elementary voltage divider stages (Em) connected in series and distributed in a composite insulator (I), each elementary stage (Em) comprising a resistor Re in parallel with a capacitor Ce, the second voltage divider stage (E2) that delivers the intermediate voltage being constituted by electronic components comprising capacitors and/or interchangeable resistors.

Abstract: The invention provides a voltage sensor for a very high-voltage direct current line comprising two voltage divider stages connected in series, the sensor being characterized in that a first voltage divider stage (E1) that divides the very high voltage to an intermediate voltage is constituted by at least two elementary voltage divider stages (Em) connected in series and distributed in a composite insulator (I), each elementary stage (Em) comprising a resistor Re in parallel with a capacitor Ce, the second voltage divider stage (E2) that delivers the intermediate voltage being constituted by electronic components comprising capacitors and/or interchangeable resistors.

Abstract: The unconventional measurement transformer for protection and/or measurement equipment of a three-phase electricity grid delivers digital information representative of a voltage or of a current of an electricity line by making use of optical sensors that are provided in sufficient number to achieve a certain amount of redundancy in the measurement paths. The output paths of the optical sensors are processed by digital processing means to validate said voltage or current digital information by a majority vote. Advantage is taken of features specific to three-phase high voltage and to the performance of such optical sensors to reduce the number of optical sensors required in an unconventional measurement transformer to obtain a degree of redundancy.

Abstract: An optical vibration sensor includes a built-in blade provided with a system for reflecting light, a system for directing light onto the reflecting system, system for collecting the light reflected by the reflecting system and a system for analyzing the intensity and/or the frequency and/or the phase of the reflected light. The blade forms an integral part of an appropriately cut block.

Abstract: The device of the invention comprises a main optical sensor (3) suitable for measuring a changing physical parameter, and a secondary optical sensor (6) suitable for measuring a disturbance which influences the measurement of said physical parameter, but for which the frequency spectrum is disjoint from that of the parameter. The sensors (3) and (6) are connected in series such that the main sensor serves to modulate the beam received by the secondary sensor.