Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1979-02-27
1980-12-16
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
G01R 1504
Patent
active
042400317
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.
REFERENCES:
patent: 3932810 (1976-01-01), Kohler et al.
patent: 3988684 (1976-10-01), Muller et al.
BBC Brown Boveri & Company Limited
Krawczewicz Stanley T.
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