Alternating current potential measuring device

Details Alternating current potential measuring device Alternating current potential measuring device

1976-12-10

1978-10-17

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324 72, G01R 120, G01R 1504

Patent

active

041211545

ABSTRACT:
A high voltage measuring device used to measure the amount of voltage in an alternating current carrying line. When in use no connections or physical contact are made between the line and the measuring device. Generally, the measuring device acts according to the capacitor divider principle with two capacitors. One electrode of one capacitor is the high voltage line itself and the other electrode of this same capacitor is a spaced flat circular plate located on the measuring device. The measuring device electrode is insulated near its periphery and connected to a low voltage capacitor having a low loss and good temperature coefficient. This capacitor forms the other part of the capacitor divider. The voltage signal across the low voltage capacitor is coupled to a high impedance operational amplifier which drives the signal through a shielded cable to a remote grounded location where a root mean square converter changes the alternating current signal to a direct current signal and sends it to a voltmeter readout unit.

REFERENCES:
patent: 3281689 (1966-10-01), Schneider et al.
patent: 3370225 (1968-02-01), Winder

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