Asea Brown Boveri Inc.

Andrezej Kaczkowski

Ken Yves Haffner

Rudolf Baumgartner

Heinz Hageli

The current and voltage transformer (10, 11) is intended for a metal-encapsulated, gas-insulated high-voltage installation. It has an annular supporting body (13) which can be fixed inside the metal encapsulation (7) and is used for holding a current sensor and a voltage sensor. The current sensor, held on the supporting body (13), is constructed as a toroidally wound coil (14) and the voltage sensor, held on the supporting body (13), is constructed as a hollow-cylindrical measurement electrode (15). After fitment in the installation, the coil (14) and measurement electrode (15) concentrically surround a current conductor (5) of the installation. This current and voltage transformer is intended to have small dimensions and is intended to be capable of fitment without problems at any point in the installation. This is achieved in that the coil (14) is wound in the manner of a Rogowski coil on an annular core (29) of non-ferromagnetic material, of essentially rectangular cross-section when cut in the axial direction, having a small radial dimension in comparison with the radius of the core ( 29) and with its axial extent, and is arranged in a hollow-cylindrical space (19) in the supporting body (13), which space is shielded against electric fields and whose boundary wall providing the electrical shielding is connected, after fitment, to the potential of the metal encapsulation (7).

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Wurenlingen, Switzerland

Andrezej Kaczkowski