Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent
1989-08-31
1990-07-24
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Polyphase
326126, 326127, 326142, 361 65, 361 86, G01R 100, H02H 300
Patent
active
049437658
ABSTRACT:
A circuit for measuring voltages in a three-phase installation, in particular an installation of the metalclad type, the circuit including for each of the phase conductors: a capacitive divider including a first capacitor connected firstly to said conductor and secondly to a second capacitor (C1, C2, C3) connected to ground, the circuit being characterized in that the voltage (v1, v2, v3) of each of the second capacitors (C'1, C'2, C'3) of the dividers is respectively applied firstly to the input of an inverter (I1, I2, I3) and secondly via a first resistance (R1, R2, R3) to the negative input of an operation amplifier (A1, A2, A3) which is also connected via second and third resistances (R21, R12, R13, and R31, R32, R23).
REFERENCES:
patent: 4295094 (1981-10-01), Wilreker et al.
patent: 4745512 (1988-05-01), Hampson
patent: 4774621 (1988-09-01), Andow
patent: 4802053 (1989-01-01), Wojtah et al.
patent: 4862076 (1989-08-01), Weihel
Dupraz Jean-Pierre
Moncorge Jean-Paul
Eisenzopf Reinhard J.
GEC Alsthom SA
Nguyen Vinh P.
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