Gec Alsthom Sa

Jean-Paul Moncorge

Jean-Pierre Dupraz

Edmond Thuries

Jean-Marc Willieme

Joseph Martin

Didier Taponat

Jean -Pierre Dupraz

Yves Perrusset

A safety device for an electrical apparatus comprising an enclosure filled with gas under pressure, the safety device comprising first means for detecting the appearance of an arc inside the enclosure, and second means controlled by the first means to establish a path for the gas through the enclosure when the first means has detected an arc for a given length of time.

Safety device for electrical apparatus containing a dielectric gas, in

A feedback system control device includes an adder producing a control signal from a feed forward signal and a correction signal. A system which processes the control signal drives the feedback system, which produces an output signal. A feed forward circuit, e.g., a four-pole network, receives the input signal and produces the feed forward signal. An error amplifier in the corrector processes the difference between the input signal and the output signal to produce an error signal. A corrector produces the correction signal from an input signal and this error signal. Two processors in the corrector each receive the error signal and produce respective modification signals between which there is a relative phase shift. An adder sums the modification signals to produce the correction signal.

Feedback system control device and applications in amplifiers and

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.

Tension potential measuring circuit with selected time constant

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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Vaux En Velin, France

Jean-Paul Moncorge