Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Electrostatic attraction or piezoelectric
Patent
1976-11-22
1977-10-18
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Electrostatic attraction or piezoelectric
324 72, 324130, G01R 528, G01R 2908
Patent
active
040548350
ABSTRACT:
A rapid-response generating voltmeter for measuring a high d-c voltage between a high voltage electrode and ground comprises two sets of stator segments, the segments of each set being electrically interconnected and each set being connected through its own capacitor to ground. Each set of stator segments has a time-varying capacitance with respect to the high voltage electrode, but the sum of these time-varying capacitances is maintained substantially constant with time.
First and second circuit means respectively sense the voltages e.sub.1 and e.sub.2 present across said two capacitors and develop first and second intermediate signals e.sub.5 and e.sub.6 substantially proportional to e.sub.1 and e.sub.2, respectively, minus, in each case, an error voltage attributable to discharge of the associated one of said capacitors. Summing means develops an output signal substantially proportional to the instantaneous sum of e.sub.5 and e.sub.6, and this output signal is substantially proportional to the high d-c voltage being measured.
REFERENCES:
patent: 2877308 (1959-03-01), Reiner et al.
Trump et al; "Generating Voltmeter . . . "; Rev. of Sci. Instruments; Feb. 1940; pp. 54-56.
Humphreys David Russell
Los Edward Joseph
Freedman William
General Electric Company
Karlsen Ernest F.
Rolinec Rudolph V.
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