Asea Brown Boverti Ltd.

Andrzej Kaczowski

Ken Yves Haffner

Rudolf Baumgartner

A combined current and voltage transformer for a metal-enclosed, gas-insulated high-voltage switching station. It has a current and voltage sensor (10) and a signal processing device connected following the current and voltage sensor (10). A coil (14) wound in the shape of a torus serves as current sensor, and a hollow cylindrical test electrode (15) serves as voltage sensor. After installation of the current and voltage sensor (10) in the metal enclosure (4), the coil (14) and test electrode (15) concentrically surround a conductor (5) of the switching station. This combined current and voltage transformer is cost effective in production, has small dimensions, and a high measurement accuracy. This is achieved when the current and voltage sensors are constructed such that signals corresponding to the temporal variation in the current to be determined and in the voltage to be determined are present at their outputs, and the signal processing device has at least one integration device on which the output signals of the current and voltage sensors (10) act.

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Wurenlingen, Switzerland

Andrzej Kaczowski