Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2006-09-26
2006-09-26
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S551000
Reexamination Certificate
active
07112968
ABSTRACT:
A method and an apparatus for detecting a partial discharge in a high-voltage transmission and distribution system include detectors which are respectively attached to a power cable and an antenna, such that a first signal and a second signal at a predetermined frequency are extracted using resonators. The first signal is supplied to a differential amplifier via a delay circuit. The second signal is supplied to the differential amplifier via a regulator that includes a variable delay circuit and a variable amplifier. The output from the differential amplifier is demodulated in a demodulator. The signal from the demodulator is supplied to an MPU via an A/D converter to determine the amount of adjustment in phase and amplitude which is to be supplied to the regulator. Then, control is provided such that the output from the differential amplifier is minimized in the absence of partial discharges.
REFERENCES:
patent: 6313640 (2001-11-01), Nasrallah et al.
patent: 6774639 (2004-08-01), Unsworth
patent: 2005/0184737 (2005-08-01), Moriyama et al.
patent: 06-308192 (1994-11-01), None
patent: 06-331686 (1994-12-01), None
Haneron Co., Ltd.
Keating & Bennett LLP
Nguyen Vincent Q.
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