Method and apparatus for measuring the void content of a solid d

Details Method and apparatus for measuring the void content of a solid d Method and apparatus for measuring the void content of a solid d

1974-10-17

1976-06-29

Mullins, James B.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 60C, G01R 3114

Patent

active

039671968

ABSTRACT:
A circuit modification of a capacitance bridge is provided to measure void content of high voltage electrical insulation. A sample of the insulation under investigation is disposed as the capacitor dielectric in one leg of a capacitance bridge. Signals proportional to the input and output of the capacitance bridge are fed to an oscillograph for display which is shaped like a parallelogram. In the disclosed invention a simple adjustment converts the parallelogram to a rectangle and the amount of adjustment required is read as a number from which the void content can be directly calculated.

REFERENCES:
patent: 3235792 (1966-02-01), Revesz et al.

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