Alstom

Areva T&d Sa

Bernard Regnier

Jean-Pierre Dupraz

Olivier Chuniaud

Jean Marmonier

Vladimir Gutalj

Lionel Lucot

Henri Jouard

The current transformer comprises at least two partial circuits (CB) each comprising a Rogowski type winding (C), each of said the partial circuits being made in the form of an angular portion of a complete circuit (CB) which surrounds at least one primary conductor (A,B,C) of the transformer over 360&#xb0;. The winding (C) of each partial circuit (CB) is constituted by a go winding (C) and by a return winding (C) which extend over the angular extent (&#x3b8;) of the partial circuit (CB). For each partial circuit (CB), the go and return windings are electrically connected in series, both having turns wound in the same direction so as to form a single winding (C) which presents a pair of adjacent electrical terminations (T, T) connected to an acquisition system (').

Current transformer with rogowski type windings, comprising an association of partial circuits forming a complete circuit

The capacitor of high thermal stability includes a high-voltage electrode (HT) extending in a longitudinal direction (AX), a cylindrical printed circuit (CI) coaxially surrounding said high-voltage electrode and including an electrically conductive track forming a low-voltage electrode (BT), and a frame (CH) having a cylindrical inside surface (SI) coaxially surrounding said cylindrical printed circuit (CI). The printed circuit is slit along a generatrix (G) of the cylinder that it forms and it is rigidly fixed to the inside surface by a fixing point (F, F). The frame includes guide means (A, A) for holding said printed circuit (CI) near the inside surface (SI) whilst allowing it to expand along said inside surface of the frame. This provides a capacitor of high thermal stability and very simple construction which is suitable for carrying out measurements on a gas-insulated high-voltage electrical line.

Capacitor with high thermal stability for shielded electrical lines

A high voltage electrical disconnector that has a moving contact that moves at high speed comprises a moving first contact which is mounted to move along an axial direction relative to a fixed second contact, and which co-operates therewith to establish an electrical connection, and a rod extending along said axial direction and which is driven to move the first contact relative to the second contact. The first contact is a hollow tube in which there slides a piston mounted on the rod. A first spring is interposed between the moving contact and a first end of the piston, and a second spring is interposed between moving contact and a second end of the piston. A first locking system is provided to prevent the moving contact from moving during a closure operation while the first spring is simultaneously being compressed, the first locking system retracting after the first spring has been compressed by a certain amount so that the moving contact is connected to the fixed contact under the effect of the first spring relaxing. A second locking system is provided to prevent the moving contact from moving during an opening operation while the second spring is being compressed by the piston, said second locking system retracting after the second spring has been compressed by a certain amount so that the moving contact is disconnected from the fixed contact under the effect of the second spring relaxing.

High voltage disconnector having a moving contact that is moved at high speed

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Trevignin, France

Bernard Regnier