Abstract: A voltage transformer for a metal encapsulated gas-filled high-voltage switching system which supplies high accuracy test values even under varying operating conditions of the switching system comprises an active capactive voltage divider in which a cylindrical test electrode and an associated counter electrode are attached by insulating elements to a flexurally rigid cylindrical support element in spaced relationship. In addition, each electrode is attached to the same annular face of the associated insulating element which partially abuts the cylindrical support element.

Abstract: A device for measuring the electrical potential of the inner conductor in an encased high-voltage switching mechanism filled with a gaseous insulator includes an active, capacitive voltage divider. One capacitor of the voltage divider is located within the grounded metal casing of the switching mechanism and is connected with an input terminal of an amplifier. The amplifier is supplied with power from the inner conductor and has a feedback path including the second capacitor of the voltage divider. In order to accurately perform voltage measurements independent of the pressure and temperature of the insulator within the casing, the feedback capacitor is also installed inside the metal casing. This arrangement enables the ratio of the capacitances of the two capacitors, which determines the quality of the voltage measurement, to remain constant over a large pressure and temperature range.