Circuit for measuring voltages in a three-phase installation, in particular an installation of the metalclad type
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United States of America Patent
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Jul 24, 1990
Grant Date -
N/A
app pub date -
Aug 31, 1989
filing date -
Sep 9, 1988
priority date (Note) -
Expired
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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).
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