Schneider Electric Industries Sas

Merlin Gerin

Other

Pellegrin, Philippe

Christian Pellegrin

Luc Weynachter

Pierre Baginski

Philippe Schuster

Francois Vincent

Patrice Allin

Alexandre Laporte

Jacques Joubert

François Vincent

Jean-Paul Ferrand

Richard Vacher

Philippe LeMaitre

Patrice Alain

Gr&eacute;goire Brun

Grégoire Brun

A safety device capable of being connected between a circuit breaker device and an electric installation powered by an electric grid providing three-phase current having a first associated frequency, using a line for conveying electric current including three phase conductors, a neutral conductor and a protection conductor. The safety device makes it possible to verify at least one electric safety condition following a cut off of electric power of the electric installation by the circuit breaker device. The safety device comprises circuitry or a processor configured to verify presence of a residual voltage above a predetermined safety threshold on at least one of the conductors, and verify isolation between a tested pair of conductors, among the phase conductors. The safety device can be used to perform an associated safety verification method.

Safety device and method for an electric installation

A limiting circuit breaker comprises two separable contacts and a mechanism with energy storage operated by an opening catch . The mechanism drives a movable cage between a closed position and an open position to perform opening of the contacts. One of the contacts is movable with respect to the cage in the closed position and can thus take a separated position. A Thomson effect electromechanical actuator is provided to drive the movable contact to the separated position. A latch enables the movable contact to be held in the separated position. In the event of a fault requiring a very high-speed response, separation of the contacts is obtained by means of the Thomson effect actuator and is then confirmed by opening of the mechanism. In other cases, only the mechanism operates to perform opening.

Very high-speed limiting electrical switchgear apparatus

A reference AC signal having a frequency of about 4-10 Hz is injected into a line of a DC electrical network for performing insulation measuring in a processing unit. The AC signal is measured in a mixed bridge having a first resistive dividing bridge connected in parallel with a second capacitive dividing bridge between the line and the ground. The intermediate output points of the first and second bridges are joined together and connected in an input of the processing unit. The impedance and the dividing ratio of the two bridges cause the DC voltage measured at said input to be low in relation to the value of the AC voltage measured at the output of said mixed bridge.

Reference voltage measuring bridge for a device for monitoring and

An isolation monitor is electrically connected between the earth and an isolated neutral of a transformer which supplies AC electrical power to the main distribution network. In order to measure and to locate an isolation fault occurring somewhere on the feeders, each feeder is equipped with a toroid current measuring transformer, and comprises further a secondary winding connected to a processing locator performing synchronous demodulation. Two first and second transmission lines are provided between the isolation monitor and the locator. The first synchronous line transmits synchronization pluses from the monitor to the locator, and the second line transmits to the locator the demodulated values of the input voltage furnished by the monitor.

Isolation monitors and measuring device for an electrical power system

An insulation monitoring device comprises an input circuit of a reference AC signal, and an electronic detection circuit for discriminating the components of a measurement signal proportional to the ground fault impedance Z formed by a leakage resistor Rf in parallel with a leakage capacitor C. A synchronous detector has a pair of static inverters processing the first component, which is a function of the current IR flowing through the leakage resistor Rf, and of the second component which is a function of the current IC flowing through the capacitor C. A converter cooperates with the generator to deliver two quadrature signals C1 and C2 to respectively control the inverters. A display means accurately displays the value of the leakage resistance Rf.

Electrical network insulation monitoring and measuring device

Growing community of inventors

Coublevie, France

Christian Pellegrin