Schneider Electric Sa

Merlin Gerin

Schneider Electric Industries Sa

Antoine Kevorkian

Dominique Persegol

Pierre Benech

Michel R Barrault

Claude Raulet

Pascal Royer

Isabelle Duport-Schanen

Adrien Danel

A voltage sensor comprises a helicoidal winding formed by an optic fiber having at least one zone sensitive or sensitized to an electrical field having a 2nd order non-linear electro optic effect. The sensitization process of the optic fiber can be achieved by a polarization process under an electric field. The voltage sensor preferably comprises a device enabling the electrical field lines to be homogenized in the region where the helical winding is located. The phase difference induced by the optic wave by electro optic effect caused by the electrical field and representative of the voltage to be measured, can be measured by polarimetric or interferometric detection.

Electro optic voltage sensor with optic fiber

Interferometric measuring device forming a spacial interference pattern

Manufacture of a buried wave guide at several burying depths

The device measures the current intensity in a conductor by FARADAY effect in a monomode optic fiber. It comprises a separator-polarizer formed for example by two coplanar half-disks of polarizing foil, whose polarization directions form a required angle, 90.degree. or 45.degree.. Photodiodes formed by a two-quadrant photodetector in the shape of a disk of the same diameter as that formed by the separator-polarizer, are located behind from the separator-polarizer. The photodiodes are connected to an electronic unit.

Device for measuring current by optic fiber and dual polarization

The medium voltage static switch is formed by serial connection of power semi-conductors, preferably of MOS type, controlled by a capacitive line. A diode is connected in parallel with the capacitor of the capacitive line between the gates of two adjacent semi-conductors. The control voltage is applied to a single control input, between the gate and source of the first stage semi-conductor.

Medium voltage static switch

Growing community of inventors

Grenoble, France

Antoine Kevorkian