Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Reexamination Certificate
2007-06-05
2009-12-01
Patel, Rajnikant B (Department: 2838)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
C324S126000, C361S118000
Reexamination Certificate
active
07626378
ABSTRACT:
A self-powered alternating current measuring and power generating circuit is designed to be connected across the terminals of the secondary winding of a current transformer. The circuit includes a current to voltage transformer, the primary winding of which is connected in series at a junction with a resistor across the terminals of the secondary winding of the current transformer. The junction of the resistor and the primary winding of the current to voltage transformer is supplied to a measuring circuit to produce an output coupled to a measuring instrument. Operating power for the measuring circuit is obtained from the secondary winding of the current to voltage transformer through a rectifier; so that the circuitry is energized without requiring additional internal or external power sources.
REFERENCES:
patent: 4908569 (1990-03-01), Fest
patent: 5077486 (1991-12-01), Marson et al.
patent: 6018700 (2000-01-01), Edel
patent: 6285094 (2001-09-01), Fest
Ogram Mark
Patel Rajnikant B
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