Abstract: A sensor for measuring the angular position of a rotor relative to a stator has firstly a rotor made of a magnetic material and including 2 p lobes, where p is an integer. A stator is positioned around the rotor. The stator is made of a magnetic material and includes a number of teeth equal to 2n.p, where n is the number of phases of the sensor. Each tooth is surrounded both by an excitation first winding and by reception second winding. The excitation windings are connected together in series and disposed on the teeth such that the windings on two circumferentially adjacent teeth produce magnetic flux in opposite directions. The set of said excitation windings are powered by an alternative current or voltage. The reception windings of the same phase and offset by 180 electrical degrees are connected together in series. The envelope of the signal at the terminals of each of the pairs of reception windings represent the angle of rotation of the rotor relative to the stator, to within a scaling factor.

Abstract: A hybrid circuit-breaker for interrupting currents having high DC components, said hybrid circuit-breaker comprising a compressed-air circuit-breaker that re-closes automatically, and a sulfur hexafluoride circuit-breaker, the circuit-breakers being disposed in series.

Abstract: An optical transformer designed to equip a grounded metal-clad installation, wherein the transformer includes a disk which is disposed transversely to the axis of the cladding and which is provided with openings via which the conductors pass, optical fibers being disposed at the periphery of said openings and being connected to an associated optical interface placed outside the cladding.

Abstract: A circuit breaker has within a casing filled with a dielectric gas, especially SF.sub.6, a first arcing contact electrically connected to a first terminal, and a second arcing contact electrically connected to a second terminal. The second arcing contact is movable within a fixed cylinder. A piston is movable within said fixed cylinder. The fixed cylinder and the piston form a compression chamber. The first arcing contact and the piston are movable relative to each other. An actuating mechanism actuates the first arcing contact in a direction opposite to that of displacement of the second contact, and actuates the piston in a direction opposite to that of the displacement of the second contact.

Abstract: An optical fiber temperature sensor including an optical fiber (1) which has a mirror (3) at its end, and which is associated with temperature-sensitive means, means for launching a signal into said fiber and means for receiving the signal reflected by said mirror back along the fiber, said temperature-sensitive means being a section of amplifying optical fiber (10) bonded to said optical fiber (1), cooperating with a light pump source, and doped with a chosen rare-earth element.

Abstract: A method of manufacturing an electrical contact between a current lead and a part made of a superconductive ceramic of the type RBa.sub.2 Cu.sub.3 O.sub.y, where R designates a lanthanide chosen from Y, La, Nd, Sm, Eu, Gd, Ho, Er, Tm, Yb, and Lu, and where y lies in the range 6.9 to 7, in which method a layer of a material based on a silver-containing resin is deposited on said part, the part is dried, and is then heat treated in oxygen by being heated to a temperature greater than 900.degree. C., and then cooled, with the temperature dwelling at 450.degree. C. for a certain length of time corresponding to the phase during which said ceramic is reoxygenated.

Abstract: A method of preventing wheel spin or wheel locking on an electric traction vehicle whose traction transmission includes servo controlling of one or more control parameters of the motor(s) of the traction transmission to an input reference value. The method is such that the control parameter(s) obtained at the output from the servo control are permanently limited by ideal values for the control parameter(s), which ideal values are such as to make it possible to obtain an input reference value for the speed of rotation of the motor(s) equal to the real travel speed of the vehicle, referred to as the reference speed, in such a manner as to stabilize the torque transmitted by the motor(s) in the event of wheel spin or wheel locking.

Abstract: A vacuum bulb for interrupting an electrical circuit, the bulb comprising two electrical poles enabling an electrical connection to be established between the outside and interrupting contacts placed inside the bulb, the body of the bulb being dielectrically reinforced by an outside insulator disposed on the bulb between the two electrical poles, wherein the insulator is constituted by a polymer sheath heat-shrunk directly onto the body of the bulb.

Abstract: A vacuum circuit-breaker including, for each phase, at least one vacuum bottle housed inside a closed enclosure, wherein said circuit-breaker includes at least one scintillation fiber disposed in the space between said enclosure and the outside surface of the vacuum bottle(s), said fiber being connected outside the circuit-breaker to an opto-electronic device.

Abstract: A high-voltage circuit-breaker has an interrupting chamber comprising a gas-tight cylindrical casing filled with a gas having good insulative properties such as sulfur hexafluoride. The casing contains a fixed permanent contact, a fixed arc contact and a mobile assembly comprising permanent contacts and arc contacts and associated with a gas blast assembly. The chamber also contains a carbon-based resistor having a resistance of approximately 500 ohms connected in parallel with the circuit-breaker contacts when the arc contacts are opened by an auxiliary switch. This resistor is connected in series with an arrangement of varistors, the resulting combination being disposed inside the casing and connected in series with the auxiliary switch. Opening of the auxiliary switch is effected by opening of the circuit-breaker. The volume of the resistor is greater than that of the arrangement of varistors by a factor of at least five.

Abstract: A high tension circuit breaker includes a gastight cylindrical insulating case filled with SF.sub.6 gas or the like and defining for each phase at least one current interrupting chamber. A fixed main contact and a fixed arcing contact are fixedly mounted within the chamber. Moving equipment of the circuit breaker includes moving main and arcing contacts and a member for moving the moving main and arcing contacts towards and away from the fixed main contact and the fixed arcing contact. A cylinder is fixedly mounted in said chamber and supports internally a movable blast piston and terminates in a blast nozzle facing the fixed contacts. A capacitor is disposed inside the circuit interrupting chamber optionally with a parallel connected varistor. A mechanism in the form of a switch including a fixed and a movable contact operates to insert the capacitor and the parallel connected varistor temporarily during both closing and opening of the circuit breaker contacts.

Abstract: A device for temporarily inserting an electrical component such as a varistor connected to a contact arm carrying a metal contact ring in parallel with the contact of a circuit-breaker comprises a small diameter metal tube mechanically joined and electrically connected to the exterior of the main mobile contact. A rod can slide inside the small diameter metal tube. The rod has at a first end, a metal contact sleeve which can come into electrical contact with the metal contact ring. The sleeve abuts a first end of the small diameter metal tube. The second end of the rod carries a conical abutment. The second end of the tube has a bore which terminates in a conical interior shape profile complementary to and sized to that of the abutment.

Abstract: A surge limiting circuit breaker has, for each phase, at least one interrupting chamber constituted by a gastight insulating enclosure filled with a gas having high dielectric strength. The enclosure contains fixed and moving main contacts and fixed and moving arcing contacts. Moving equipment effects movement of the moving contacts relative to the fixed contacts. The enclosure includes a varistor. The varistor is inserted in parallel with the circuit breaker contacts on separation of the main contacts when the circuit breaker is being opened, disconnecting the varistor before the end of the stroke of the moving arcing contact. The varistor is inserted in parallel with the circuit breaker contacts while closing the circuit breaker and prior to bringing the arcing contacts into contact with each other. The varistor is short-circuited when the arcing contacts come into contact.

Abstract: A circuit breaker includes an insulating casing, a stationary main contact, a stationary arcing contact. A moving main contact and a moving arcing contact constituted by a tube define a blast cylinder co-operating with a first fixed piston. A second piston secured to a moving assembly includes the tube and slides in a second stationary cylinder. The volume between the two cylinders is put into communication with a volume adjacent to the casing or with a volume inside the tube via openings. An inertial ring selectively closes off the openings by moving between first and second extreme positions, the first position being one in which the openings are open and corresponding to a rest position for the moving assembly, and the second position being one in which the openings are closed.

Abstract: The present invention relates to a medium- or high-tension circuit breaking having abutting arcing contacts and comprising a casing filled with a gas having good dielectric properties and containing a stationary first abutting contact and moving equipment including a first tube capable of being displaced by a drive rod and a semi-moving tubular second abutting contact. The annular end of the first tube carries a ring of contact arms that slide on the first abutting contact and that carry respective arcing contact blocks at their ends and respective permanent contact swellings proximate to the arcing contact blocks. A circuit breaker is thus provided which withstands the effects of arcing particularly well.

Abstract: A device for causing a drop in the pressure of high pressure oil controlling admission valves of a steam turbine in the event of excess speed, the device comprising a speed trip (2) constrained to rotate with the shaft (1) of the turbine and fed downstream from a constriction (5) with low pressure oil from the low pressure lubricating oil circuit of the turbine, the device being characterized in that it comprises a hydraulically controlled valve (9) having a hollow body (23) containing a closing valve member (24) for closing a discharge orifice (12) connected to said high pressure oil circuit, said closing valve member (24) being connected to a plate (25) dividing in sealed manner the inside of the body of the hydraulically controlled valve (9) into two compartments, a "first" one (11) of said compartments being situated on the same side as said discharge orifice (12) and also including at least one evacuation orifice (37), and the "second", other one of the compartments (8) being fed downstream via a feed or

Abstract: A varistor and resistor device for incorporating in the interrupting chamber of a dielectric gas circuit breaker, the varistor and resistor components being connected in series and being housed in an insulating tube. The varistor components and the resistor components are firstly superposed with superposed components being separated from one another by insulating components, and are secondly juxtaposed with juxtaposed components being electrically interconnected by conductor components interposed between the ends of the superposed components and the insulating components.

Abstract: A high tension circuit-breaker has an insulating case filled with a dielectric gas such as SF.sub.6. A high capacitance capacitor and at least a varistor are electrically interconnected in parallel and are connected to a first terminal. The capacitor and varistor are associated with an insertion mechanism which momentarily inserts the capacitor and varistor in parallel with the arcing contacts during circuit-breaker disengagement or engagement. The insulating case is extended by at least one conductive case housing both the capacitor and at least part of the varistor.

Abstract: A blade array for turbomachines comprises blades disposed between an inner wall and an outer wall. The inner wall and/or the outer wall is provided with a suction port near at least some blades. This port has a first end situated along the upper surface in a region of the blade extending from the point of maximum curvature to the neck of the passage between said blade and the adjacent blade. The port enabling the efficiency to be increased is oriented along an isobar line. Its length is such that the second end is spaced from the upper surface of the blade by a distance between one quarter and one half the width of the neck of the inter-blade passage.

Abstract: A circuit-breaker including at least one insulating interrupting chamber inside which there are contacts and a blast nozzle. The insulating interrupting chamber is placed on an insulating support containing a drive rod. The circuit-breaker further includes a first terminal and a second terminal. The circuit-breaker has at lest one fluorescent or scintillating optical fiber disposed inside the support and constituting a symmetrical loop around the drive rod. Each end of the fiber is connected to a photodiode equipped with an amplifier. Light propagated in the interrupting chamber, as a result of arcing, reaches the optical fiber loop via a light passage within a terminal of the interrupting chamber remote from the arcing zone within the interrupting chamber.