Abstract:
A DEVICE FOR ELECTOLLYTICALLY DEPOSITING METAL ON AN OBJECT OR FOR AND ANODIC OXIDATION OF AN OBJECT IMMERSED IN AN ELECTROLYTIC BATH, HAVING A REFERENCE ELECTRODE IN CONTACT WITH THE ELECTROLYTE IN THE BATH THROUGH AN ION-CONDUCTING CONNECTION TO MEASURE THE POTENTIAL OF THE OBJECT. AN AUXILIARY ELECTRODE IS PLACED CLOSE TO THE OUTLET OF THE ION-CONDUCTING CONNECTION TO SIMULATE THE CONDITIONS AT THE SURFACE OF THE OBJECT. THE POTENTIAL CAN THEN BE MEASURED FROM THE AUXILIARY ELECTRODE.
Abstract:
In manufacturing sintered bodies, a compacted charge of powder forming a billet is enclosed in a sealed casing of soft metal such as steel from which the air has been evacuated. The casing and powder are subjected to pressure at high temperature in a furnace chamber to sinter the powder. Before its introduction into the chamber, the charge is heated outside the furnace to treating temperature. The charge is inserted from below into the furnace, after which the bottom opening of the furnace is closed and pressure medium is introduced. The furnace has an insulating sheath within the furnace chamber depending from the top of the chamber and terminating near its bottom. The material of the casing is so chosen that there will be substantially no interchange of material especially of carbon, with the material of the compacted billet.
Abstract:
A high voltage electric network has an AC part and a DC part and a converter station connecting the parts. An arrangement is provided for controlling the converter station to maintain a predetermined power exchange between the two parts of the network and to dampen oscillations arising in the AC part. The AC part has two portions as seen from the connection point of the converter station. The converter station is connected to the AC part by an inductive member which has an intermediate output connected to the portion of the AC part of lower impedance while one end of the inductive member is connected to the converter and the other end portion of the AC part.
Abstract:
In an operating device for high voltage gas blast circuit breakers, the opening impulse is transmitted from earth to high potential by means of an insulating tension rod. A high initial acceleration of the rod is obtained by suddenly evacuating a pressurized cylinder space at earth potential through an electrodynamically operated valve.
Abstract:
In a high voltage circuit breaker of low liquid type the breaking chambers are pressurized to prevent the circuit breaker from restriking when breaking capacitive loads. All the seals required for these pressurized chambers are located below the liquid level in each chamber.
Abstract:
A chain of series-connected spark gap piles have two grading chains in parallel therewith with connections therebetween. An arrangement is provided for triggering one of the spark gap piles. When this pile is triggered, all the spark gap piles in the chain spark over if the voltage over the spark gap piles between two connections from a grading chain is not less than the spark-over voltage for each of these piles. One grading chain is formed of a number of resistors and capacitors in parallel connected across each end gap pile and each pair of other gap piles, and the other grading chain is formed of resistors in the chain between the pairs of gap piles and circuits formed of a capacitor and a resistor in parallel with each pair of gap piles.
Abstract:
An overvoltage protection device for a DC transmission line connecting two stations, each station including several seriesconnected converters each provided with a bypass member, has a series of lightning arrester units connected between the transmission line and earth. At least all but one of the lightning arresters has a bypass device. Relays for closing the bypass devices to short circuit the lightning arresters are connected to the bypass members for the converters in such a way that the number of bypassed lightning arresters corresponds to the number of bypassed converters.
Abstract:
A marshalling yard retarder includes a mechanical braking means with elongated braking members on both sides of the rail movable towards and from the vertical plane of the rail to engage against a wheel rolling on the rail. The braking members are pivoted about horizontal axes and are actuated by hydraulic pistons which are flexibly mounted. The cylinders are supplied by a supply conduit containing a nonreturn valve and a return conduit having a pressure-limiting overflow member which is connected to a storage tank from which the pressure medium is drawn. There may be two pressure-limiting overflow members set for different pressures, and a weighing means for selectively connecting these members to the return line.
Abstract:
IN HYDROSTATIC EXTRUSION OF A WIRE OR ROD CONSTITUTED BY A CASING OF ONE MATERIAL AND A CORE OF ANOTHER, USUALLY A SOFTER MATERIAL, A BILLET IS EXTRUDED THROUGH A DIE FROM A PRESSURE CHAMBER PROVIDED WITH A CONICAL SURFACE, ADJACENT THE DIE OPENING, THE BILLET IS SO CONSTRUCTED THAT THE AXIAL FORCES CREATED BY THE DIFFERENCES IN MOLDING RESISTANCE OF THE DIFFERENT MATERIALS ARE TRANSFERRED BETWEEN THE CASING AND THE CORE. THIS IS DONE BY PRESSING THE REAR END OF THE CASING INTO A GROOVE IN THE CORE.
THE JOINT BETWEEN THE CASING AND CORE IS SEALED AT THE REAR ENDS. THE FRONT END OF THE CORE IS SHAPED TO MATCH THE CONICAL SURFACE OF THE DIE, AND THE CASING MAY BE BROUGHT DOWN OVER THIS FRONT END, THE FRONT END OF THE CASING TAPERING IN THICKNESS. SUCCESSIVE CASING AND CORES MAY BE JOINED ONTO THE REMAINING PARTS OF CASINGS AND CORES OF A PREVIOUS BILLET WHICH HAS BEEN LARGELY EXTRUDED.
Abstract:
A stator core with a directly liquid-cooled stator winding has a plurality of slits axially spaced along it perpendicular to the axis. Each slit contains a plurality of cooling blocks arranged together to extend around the periphery of the core. A substantially annular cooling tube is arranged in grooves in the blocks extending substantially tangentially, and is clamped in these grooves.