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| Number | Title | Issue Date |
| 4806806 | Coil for arrangement in slots in a stator or rotor of an electrical machine A coil for arrangement in slots in a stator or rotor of an electrical machine, in particular a high voltage coil, comprising a bundle (17) of a plurality of conductors (18) located adjacent to each other and provided with a conductor insulation (19) for i... | 02/21/1989 |
| 4797805 | Fault location in a power supply network A method for location of a fault on a transmission line in a network for distribution and transmission of electric power uses a travelling wave model of the transmission line positioned in measuring stations (P, Q) at either end of the transmission line, ... | 01/10/1989 |
| 4739665 | Torque transducer with neutral point compensation A torque transducer with neutral point compensation has a measuring axle formed as a hollow member inside which a slender torsion spring is axially arranged to internally load the hollow member. With this device a constant torque load on the measuring axl... | 04/26/1988 |
| 4676295 | Method and apparatus for the production of castings A method and apparatus in the production of metallic castings in which metal in molten state is fed from a heated container to a mold or a smaller container via a pressure pipe, a pressure-generating means and a suction pipe. The temperature of the metal,... | 06/30/1987 |
| 4471175 | Rail-bound vehicles provided with electric current collectors In a rail-bound vehicle which has a vehicle body which can be tilted in relation to supporting bogies when travelling along curved track sections, a current collector for collecting electric current from an overhead contact line is arranged on transverse ... | 09/11/1984 |
| 4432029 | Protective means for series capacitors A protective means for a series capacitor in a high-voltage network comprises a voltage-dependent resistor (varistor) arranged in parallel with the series capacitor, a spark gap arranged in parallel with the varistor for shunting the latter when it become... | 02/14/1984 |
| 4409636 | Device for detecting faulty phases in a multi-phase electrical network The present invention relates to a protection device for detecting at least one faulty phase in an electrical network. The device comprises a band exclusion filter for each phase for filtering away the signals which have the same frequency as the nominal ... | 10/11/1983 |
| 4403862 | Visibility measuring apparatus using light conductors In visibility measuring apparatus, a transmitter including at least one transmitter optic for emitting light signals and at least one receiver including at least one receiver optic for receiving the emitted light signals are positioned in a measuring base... | 09/13/1983 |
| 4378496 | Current measuring apparatus using light-emitting devices The invention relates to a device for measuring current which traverses a light-emitting structure, the current passage thus causing emission of light. It is characterized in that the emitted light signal is adapted to be supplied to two photo-detectors h... | 03/29/1983 |
| 4377834 | Multiphase blocking circuitry for electrical power supply networks In circuitry for generating tripping and blocking signals for the protection of electrical power supply network components as a result of the occurrence of faults, the blocking signals are selected from each phase of the electrical power supply network to... | 03/22/1983 |
| 4376890 | Fiber-optic temperature-measuring apparatus A fiber-optic temperature-measuring apparatus which monitors the photo-luminescence of a body of solid material subjected to the temperature to be measured. Exciting radiation is conducted by means of at least one optical fiber towards a material with tem... | 03/15/1983 |
| 4370671 | Semiconductor device A semiconductor device comprises a semiconductor wafer arranged between metallic connecting members for supplying electric current to, and leading it from, the wafer, each connecting member having a substantially cylindrical external part. A ring of a sul... | 01/25/1983 |
| 4352140 | Surge arrester In a surge arrester comprising a stack of series-connected cylindrical ZnO-varistors in an insulating housing, the envelope surface of each varistor is provided with an insulating protection means, which overlap varistors positioned adjacent to each other... | 09/28/1982 |
| 4352136 | Impedance-measuring device for impedance protection In an impedance-measuring device for impedance protection, the phase positions of a plurality of alternating-current quantities are compared with the aid of a phase comparator. From the output signal thereof it is clear whether the impedance in a fault lo... | 09/28/1982 |
| 4318167 | Electrical inverter with controllable output voltage An electrical inverter with controllable output voltage comprises a three-phase self-commutated inverter bridge which is supplied from a d.c. voltage source. A reference signal generator generates a three-phase binary reference signal for controlling the ... | 03/02/1982 |
| 4318169 | Suspension-mounted static electrical converter A static electrical converter, preferably for high voltage, has at least one valve assembly each having a single valve or a plurality of electrically series-connected valves. The valve assembly is provided with suspension members at its upper end, so that... | 03/02/1982 |
| 4313344 | Fiber optical temperature measurement devices The invention relates to a fiber optical temperature measuring device of the pyrometer type, comprising a transducer section and an electronic section, which are mutually interconnected by at least one optical fiber. The electronic section includes at lea... | 02/02/1982 |
| 4296452 | Multiphase fault protection circuitry with variable functional level detection In circuitry for generating tripping and blocking signals for the protection of electrical components in an electrical power supply network as a result of the occurrence of faults therein, respective tripping and blocking outputs for each phase of an elec... | 10/20/1981 |
| 4295113 | Sheet-wound transformer or reactor In a transformer or a reactor having at least one winding of foil-formed electrical conductor material, a magnetic-flux-controlling spirally-wound sheet of highly permeable ferro-magnetic material is arranged axially outside each end of the winding. The e... | 10/13/1981 |
| 4278240 | Powder injection apparatus with sieving apparatus The invention relates to an apparatus for injection of powder in a metal melt, a charging container being filled by means of an ejector via a sieve for separation of coarser grains. The charging container is combined with a lance for immersion into the me... | 07/14/1981 |
| 4278349 | Fiber optical temperature sensors A fiber optical temperature measuring apparatus is based on the ability of certain materials to change color in dependence on changes in temperature. Visible or invisible light having at least two different wavelengths is supplied to the material and the ... | 07/14/1981 |
| 4198668 | High-voltage direct current interuption devices a spark gap device in a high-voltage direct current interrupting device maintains a substantially constant ignition voltage by constructing the spark gap device in at least two series-connected main spark gaps connected in parallel with a voltage divider ... | 04/15/1980 |
| 4183395 | Multi-phase stirrer A multi-phase stirrer for stirring the molten cores of cast slabs from continuous casting machines is divided into at least two partial stirrers with each partial stirrer comprising at least one phase winding and fed with a number of phases at least one l... | 01/15/1980 |
| 4162442 | Capacitor equipment A capacitor bank for power factor correction and/or voltage control is connectible to an AC network through a bidirectional static switch. Voltage sensing and comparing means effect connection of the capacitor bank to the network at the moment when the in... | 07/24/1979 |
| 4121043 | Preheating metallurgical enclosures A method for preheating metallurgical enclosures having refractory linings which after preheating are exposed to the heat of molten metal, is effected by forming an electric open arc producing arc radiation at a location inside of such an enclosure exposi... | 10/17/1978 |
| 4120370 | Weighing equipment Weighing equipment for weighing a load which is included in a mechanical system with a natural frequency of oscillation which depends on the size of the load, for example in a crane, includes a transducer influenced by the load and which delivers a signal... | 10/17/1978 |
| 4105507 | Method and system for instantaneously determining the oxygen activity in molten metals A system for determining the oxygen activity in molten metals includes a measuring probe insertable in the melt and provided with an electrochemical cell, a thermoelement, and three contact devices. The probe is mounted at the end of a measuring lance. A ... | 08/08/1978 |
| 4105388 | Hydraulic press A press for molding large sheets around a forming surface which includes an elastic press pad, a first frame member on the side of the press pad away from the working surface thereof, the first frame member having a top wall and side walls forming a press... | 08/08/1978 |
| 4070614 | Magnetoelastic shape meter for cold-rolled strips of ferromagnetic material In ordr to measure deformations of magnetic material which is being cold-rolled a plurality of magnetoelastic stress-sensing transducers are used, each of which has two U-shaped magnetic cores provided with windings and crossing each other perpendicularly... | 01/24/1978 |
| 4041264 | Operating device for a contact device for a pre-insertion resistor in a high-voltage circuit breaker For rapid on-off operation of a contact device for a pre-insertion resistor in a high voltage compressed gas circuit breaker, the operating device includes a piston movable in a cylinder and connected to a movable contact. The piston forms two spaces in t... | 08/09/1977 |
| 4038849 | High pressure press A press for hydrostatic extrusion includes a pressure chamber for enclosing a pressure medium which is formed of a high pressure cylinder, a pressure generating piston, a die and a die support and seals. The die support includes an exchangeable support ri... | 08/02/1977 |
| 4037143 | Means in a motor-driven rail-vehicle A motor-driven rail-vehicle with a drive system including an electric motor and drive wheels is provided with an oscillation sensing member which senses oscillations within a pre-determined frequency range of an electrical quantity of the drive system, su... | 07/19/1977 |
| 4032704 | Method and apparatus for treating a metal melt A metal melt is treated by injecting fluid material into the melt below its surface and which material does not add heat to the melt during the injecting, thus requiring the addition of heat to the melt during the injecting, to maintain the melt's tempera... | 06/28/1977 |
| 4027225 | DC convertor A convertor for supplying a load with direct voltage pulses of variable frequency includes input terminals for connection to a DC source and a main circuit, with a filter circuit connected between the input terminals and the main circuit. The filter circu... | 05/31/1977 |
| 4013952 | Means for current measuring in static convertors For measuring the load current in a static convertor, there are provided a direct current measuring device on the direct current side of the convertor and an alternating current measuring device on the alternating current side. These measuring devices are... | 03/22/1977 |
