Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent
1990-12-03
1991-11-26
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Polyphase
324103R, 324111, 324126, G01R 1900
Patent
active
050685988
ABSTRACT:
A circuit for measuring the tension of an electricity line, the circuit comprising a capacitive divider comprising first and second capacitors, first and second amplification lines for amplifying the tension across the terminals of the second capacitor, said amplification lines having respective time constants of the order of 100 ms and in the range 2.5 ms to 15 ms, the amplification lines being connected to respective first and second controlled switches under the control of a logic circuit, the circuit further including a circuit for generating the absolute value of the algebraic difference between the signals provided by the amplification lines, and a comparator circuit for providing an output signal that controls the logic circuit causing it to change state when said absolute value exceeds a given threshold.
REFERENCES:
patent: 3624500 (1971-11-01), Patzelt
patent: 3665506 (1972-05-01), Sanford
patent: 3732492 (1973-05-01), Geul
patent: 4327390 (1982-04-01), Despiney
patent: 4556842 (1985-12-01), Rosswurm
patent: 4611194 (1986-09-01), Konig et al.
Burns William J.
GEC Alsthom SA
Wieder Kenneth A.
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