Patents Assigned to Merlin Gerin
  • Monitoring process and device of a quasi-closed electromagnetic shield
    Patent number: 5068616
    Abstract: An emitter assembly of low-power electromagnetic signals with random or pseudo-random frequency variation is located inside an electromagnetic shield to be monitored. These signals are detected by at least one synchronous detection receiver located outside the shield, a second transmission channel, preferably constituted by an optic fiber, connecting the emitter and receiver assemblies to enable synchronous detection of signals transmitted via an electromagnetic channel through the shield. The amplitude of the electromagnetic signals received by the detector is significant of the quality of the shielding.
    Type: Grant
    Filed: August 1, 1989
    Date of Patent: November 26, 1991
    Assignee: Merlin Gerin
    Inventors: Frederic Broyde, Michel Barrault
  • Correction procedure of the phase difference introduced by a zero sequence toroid of leakage current and isolation monitor this procedure
    Patent number: 5066920
    Abstract: A digital isolation monitor comprises a signal processor operating in conjunction with a measuring circuit to perform a first no-load measurement and a second load measurement of a zero sequence signal delivery by a toroid of a differential transformer, followed by synchronous demodulation, A microcontroller computes the tangent of the angle of phase difference introduced by the toroid by computing the relationship between the load and no-load components, and determines the true values of the leakage resistance and stray capacitance of the power system.
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: November 19, 1991
    Assignee: Merlin Gerin
    Inventor: Eric Suptitz
  • Production machine incorporationg a high-speed lift and carry device with double walking beam, and the production system implementing this type of machine
    Patent number: 5062525
    Abstract: A production machine equipped with two walking beam lift and carry devices forming two parallel tracks, a main track and a branch track. Transfer of a part from the branch track to the main track is achieved by a handling unit synchronized with the walking beam.
    Type: Grant
    Filed: September 24, 1990
    Date of Patent: November 5, 1991
    Assignee: Merlin Gerin
    Inventors: Claude Terracol, Patrick Bredel, Jean-Laurent Guillet
  • Electrical circuit breaker with self-extinguishing expansion and insulating gas
    Patent number: 5057655
    Abstract: An inside of tubular contacts of a self-extinguishing expansion SF.sub.6 -gas circuit breaker including guiding ribs arranged to oppose any vortex-effect swirling gas flow between a first extinguishing chamber and a second expansion chamber. The presence of these ribs improves the dielectric withstand of the circuit breaker, and prevents any arc restriking inside the contacts.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: October 15, 1991
    Assignee: Merlin Gerin
    Inventors: Jean-Pierre Kersusan, Hugues Filiputti, Victor Pennucci, Peter Malkin
  • Limiting circuit breaker equipped with an electromagnetic effect contact fall delay device
    Patent number: 5029301
    Abstract: A limiting circuit breaker comprises an electrodynamic repulsion contact system, and an electromagnetic latch arranged in the vicinity of the contact system, and electrically insulated from the latter. Actuation of the latch to the active position results from the action of the electromagnetic field due to a short-circuit current flowing in the pole, so as to temporarily keep the movable contact open after repulsion. The latch is equipped with a pair of ferromagnetic brackets, and with a spring blade to return to an inactive position.
    Type: Grant
    Filed: June 27, 1990
    Date of Patent: July 2, 1991
    Assignee: Merlin Gerin
    Inventors: Jean-Pierre Nebon, Pascal Dudon, Patrick Coudert, Robert Morel
  • Measuring device of the rms value of a signal, notably for current measurement in a solid-state trip device
    Patent number: 5027060
    Abstract: The measuring device of the rms value of a signal comprises, in series, a full-wave rectifier, a low-pass filter, for example of the RC type, and a peak detector. The output signal of the device is representative of the rms value of the input signal, the cut-off frequency of the filter corresponding to an angular frequency comprised between 4.pi.f/6 and 4.pi.f/5.33, f being the fundamental frequency of the input signal of the device.
    Type: Grant
    Filed: July 17, 1990
    Date of Patent: June 25, 1991
    Assignee: Merlin Gerin
    Inventor: Didier Fraisse
  • Rotating arc electrical switch
    Patent number: 5003138
    Abstract: A medium-voltage electrical switch comprises contacts actuated by a connecting rod and crank system. Parallel to the main contacts there is arranged an arcing circuit comprising a cylindrical electrode disposed inside a coil and whose internal surface cooperates with a movable arcing contact. The mechanical link connecting the main contact to the arcing contact comprises a crank and connecting rod system comprising a flexible part formed by an aperture and a spring providing the contact pressure of the arcing contacts. In the open position of the switch, the connecting rod extends perpendicular to the crank and the flexible part is neutralized so as to hold the movable arcing contact without clearance in the open position despite the electrodynamic forces acting on it.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: March 26, 1991
    Assignee: Merlin Gerin
    Inventors: Roger Bolongeat-Mobleu, Denis Raphard, Jean-Pierre Boyer
  • Rotating arc circuit breaker with centrifugal extinguishing gas effect
    Patent number: 5001313
    Abstract: A rotating arc circuit breaker comprising a pair of separable arcing contacts, a coil to set the arc in rotation, and an annular migration electrode. Guiding fins are arranged in the extinguishing chamber to slow down the rotation of the gas in a first peripheral zone, so as to generate a differential speed between the arc and the gas favoring the heat exchange in the second zone close to the breaking gap.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: March 19, 1991
    Assignee: Merlin Gerin
    Inventors: Pierre Leclercq, Paul Glenat, Peter Malkin
  • Modular cabinet for electrical battery banks
    Patent number: 4994940
    Abstract: A modular cabinet including a plurality of battery modules each which can be withdrawn from the cabinet. The frame has a parallelipipedic-shaped metal framework, including a plinth of rectangular cross-section parallel to the different shelves, roller devices fixed to the base of the plinth to provide movement of the module in the depthwise direction between an inserted position and a withdrawn position, a first vertical front flange extending perpendicularly to the plinth, a second rear flange parallel to the first flange and shelves interposed in the depthwise between the flanges. A closed side plate connects the two flanges and the plinth, and a transverse free space is provided between the batteries and the open side face opposite the side plate. Movement of the module in translation to the withdrawn position enables all the batteries to be fully accessed via the open side face.
    Type: Grant
    Filed: September 26, 1989
    Date of Patent: February 19, 1991
    Assignee: Merlin Gerin
    Inventors: Jean-Marie Thouvenin, Jean-Pierre Bochard, Jacques Doize
  • High rating molded case multipole circuit breaker
    Patent number: 4958135
    Abstract: A high-current multipole circuit breaker is made up of standard poles juxtaposed in a molded case. At least two adjacent poles are twinned, that is to say electrically arranged in parallel and connected to a common connecting strip. The connecting strips of the other poles are widened, so as to partially overlap the immediately adjacent twinned pole. In this way, the circuit breaker rating is higher than that of the individual poles which make it up.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: September 18, 1990
    Assignee: Merlin Gerin
    Inventors: Pierre Baginski, Jean-Pierre Nebon, Marc Bur
  • Limiting circuit breaker
    Patent number: 4952897
    Abstract: The limiting circuit breaker comprises a Thomson effect propelling device for opening of the contacts.The main contact bridge is securedly united to an operating rod surrounded by an annular opening coil of the propelling device. The latter comprises an opening disk which is movable in relation to the rod and an annular piston securedly united to the rod, springs being disposed between the disk and the piston, so as to return the disk to the rest position facing the coil at the end of the opening travel.
    Type: Grant
    Filed: September 15, 1988
    Date of Patent: August 28, 1990
    Assignee: Merlin Gerin
    Inventors: Pierre Barnel, Francois Lindeperg, Jean-Pierre Nebon, Philippe Perrier
  • Self-expansion electrical circuit breaker with variable extinguishing chamber volume
    Patent number: 4950855
    Abstract: A self-expansion electrical circuit breaker includes an arc extinguishing chamber of variable volume by repulsion of a piston by the pressure of the gas in the extinguishing chamber. A semi-stationary contact is securedly united to the piston so as to increase the separation distance of the contacts at the same time as the volume of the extinguishing chamber increases.
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: August 21, 1990
    Assignee: Merlin Gerin
    Inventors: Roger Bolongeat-Mobleu, Regis Rival, Gerard Menou
  • Low-voltage limiting circuit breaker with leaktight extinguishing chamber
    Patent number: 4943691
    Abstract: A current limiter comprises an extinguishing chamber 16 of small volume, in which there are housed a pair of contacts 28, 30 and an insulating shield 40, capable of moving to an active position inserted between the contacts 28, 30, and of subdividing the chamber 16 into two parts each of which contains one of the contacts 28, 30. The movement of the insulating shield 40 to the inserted position between the contacts 28, 30 is favored by the action of a piston 48 subjected to the pressure prevailing in the extinguishing chamber 16.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: July 24, 1990
    Assignee: Merlin Gerin
    Inventors: Jean-Luc Mertz, Hubert Guerin, Michel Perrot, Patrick De Robertis
  • Electromagnetic trip device with tripping threshold adjustment
    Patent number: 4939492
    Abstract: The tripping adjustment range of a magnetic trip device with a plunger core is increased by providing, in the movable plunger core, a groove whose edges define polar surfaces bounding air-gaps with the edges of the yoke in such a way as to generate in the minimum adjustment position a force which is added to the attractive force of the movable core by the stationary core, and inversely a force in the maximum adjustment position which is subtracted from the attractive force of movable plunger core. The trip device excitation coil is offset with respect to the yoke to increase the adjustment range, and a return device with adjustable stop and decreasing return force as the movable core approaches the stationary core, contributes to increasing this tripping threshold adjustment range.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: July 3, 1990
    Assignee: Merlin Gerin
    Inventors: Andre Raso, Pierre Laffont, Denis Vial
  • Ground fault current protective device
    Patent number: 4937706
    Abstract: A ground fault trip unit of the three-pole type, comprises a fourth conductor passing through the differential transformer. The fourth conductor is connected to terminals located on a different face from that of the terminals of the other three conductors. The same ground fault trip unit can be associated with a three-pole breaking device, in which case the fourth conductor is not used, and with a four-pole device whose fourth pole is connected to the fourth conductor of the ground fault trip unit.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: June 26, 1990
    Assignee: Merlin Gerin
    Inventors: Pierre Schueller, Gilbert Garnier
  • Gas-blast circuit breaker
    Patent number: 4935590
    Abstract: A puffer SF6 circuit breaker comprises a pair of separable contacts with formation of a breaking gap, a piston-cylinder assembly to compress the gas when the movable contact is actuated to the open position, and a puffer nozzle designed to channel the gas outflow to the breaking gap so as to cool the arc by forced convection. The nozzle is totally or partially made of transparent or translucent insulating material to allow a part of the energy to be removed by radiation.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: June 19, 1990
    Assignee: Merlin Gerin
    Inventors: Peter Malkin, Raymond V. Bresson, Paul Glenat, Jean-Claude Faye
  • Control and protection assembly connecting a local area communication network to an industrial process
    Patent number: 4935863
    Abstract: The control and protection assembly according to the invention comprises several channel units, for example a motor channel unit, a jack channel unit and an inputs-outputs channel unit, directly connected to the process to be controlled, each unit comprising a microprocessor preprogrammed so as to perform control, decentralized protection and monitoring of the associated channels. Each unit is connected to an electrical power supply system and to an internal serial network. A connecting unit acts as interface between the internal serial network and a local area communication network. The configuration and parameter setting information relevant to the process to be controlled is supplied to the various units by means of a console connected to the connecting unit.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: June 19, 1990
    Assignee: Merlin Gerin
    Inventors: Roland Calvas, Claude Francon, Claude Matinal
  • Sintered composite material for electrical contact
    Patent number: 4919717
    Abstract: Sintered composite material containing 80% to 95% weight of copper, 2% to 15% weight of nickel and 2% to 5% weight of graphite, designed for the manufacture of electrical contact pads for low voltage switchgear devices. The copper powder can be of a spongy form having an average diameter of less than 24 .mu.m, an oxygen content of lower than 2000 ppm and a purity in metallic elements of 99.5%. The graphite powder can be of pellicular form, having particles about 100 .mu.m in length and 20 .mu.m in thickness, and an ash content of less than 0.2 ppm. The nickel powder can be of a spheroid shape having an average diameter of less than 5 .mu.m.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: April 24, 1990
    Assignee: Merlin Gerin
    Inventors: Jean Ambier, Marie-Jo Francillon, Colette Allibert, Catherine Laugee
  • Operating mechanism of a three-position switch
    Patent number: 4916268
    Abstract: An operating mechanism of a three-position switch comprises a tumbler device with an energy storage spring associated with a toggle, a main operating crank controlled by a switching shaft, and an earthing crank mounted in rotation on a first operating spindle. Opening and closing are performed by means of a second operating spindle, offset from the operating shaft and operating in conjunction with a transmission system designed to drive the toggle. A latching lever of the main crank is unlocked by a boss when the toggle is in the vicinity of the dead-point.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: April 10, 1990
    Assignee: Merlin Gerin
    Inventors: Robert Micoud, Jacques Vernay
  • Uninterruptible power supply cell
    Patent number: D316396
    Type: Grant
    Filed: August 13, 1987
    Date of Patent: April 23, 1991
    Assignee: Merlin Gerin
    Inventors: Jean Decosse, Georges Herman