Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-05-10
1981-01-13
Moore, David K.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 52, 324 72, G01R 3112
Patent
active
042451876
ABSTRACT:
A method and apparatus for determining the presence of partial discharge ivity (corona) which makes use of corona current signals in the 20 MHz to 50 MHz frequency range and provides for identification of the corona source in a capacitor matrix. A current probe coupled to the high potential side of the capacitor detects corona discharge current signals that are fed to a bandpass filter which passes signals in the frequency range of 20 MHz to 50 MHz. The signals from the bandpass filter are amplified and integrated to provide a d.c. level proportional to the corona activity. The d.c. level signal is encoded by a voltage controlled oscillator and then converted to light. A fiber optic link transmits the converted signal to a remote console where the encoded light is reconverted to a d.c. level signal which can be displayed as an analog signal as well as activating an audio or visual alarm. A plurality of local current sensors and related circuitry corresponding to the number of capacitors in the capacitor matrix are provided to provide for comparisons of the corona signal levels from each capacitor to provide identification of the source capacitor containing the highest corona activity.
REFERENCES:
patent: 3622872 (1971-11-01), Boaz
patent: 3657602 (1972-04-01), Boehm et al.
patent: 3707673 (1972-12-01), Carter
patent: 3739272 (1973-06-01), McKean
patent: 3869665 (1975-03-01), Kenmochi et al.
patent: 4064454 (1977-12-01), Yoshino et al.
patent: 4140965 (1979-02-01), Neal
Davis Neil M.
Wagner Neal K.
Johnston Ervin F.
Moore David K.
Phillips Thomas M.
Sciascia Richard S.
The United States of America as represented by the Secretary of
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