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WO/1999/009569A1 |
A ferroresonant transformer (56) includes a three legged magnetic core. The core includes a center leg (58), and first and second flanking legs. Each of the center and flanking legs have respective first and second longitudinal ends. The...
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WO/1998/048432A1 |
The invention concerns a circuit for a load transfer switch comprising a regulating winding with a regulating stage (1) whose load current can be conducted via a lower or a higher winding tap (2, 3) and via at least two selector contacts...
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WO/1998/047159A1 |
A controllable inductor including at least one tubular core (10), a main winding (5) surrounding the core and a control winding (11) running substantially axially through said core and returning substantially axially outside thereof betw...
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WO/1998/043257A1 |
A tubular core (6) for a controllable inductor with a main winding (1) surrounding the core and a control winding (7) passing substantially axially through said core, said core being intended to receive a magnetic flux from said main win...
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WO/1998/043259A1 |
An arrangement with a conductor (15) intended to be on a high potential and a part (12) connected to ground and separated therefrom by at least a voltage receiving air gap (16, 17), comprising an insulating envelope (18) surrounding said...
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WO/1998/034249A1 |
A power- or regulating transformer (11) with voltage regulating means is disclosed. The transformer comprises regulating windings (15) made of a flexible conductor having electric field containing means forcing the electric field due to ...
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WO/1998/034244A1 |
A power transformer or inductor is disclosed. The winding (31) of the transformer/inductor is made of a flexible conductor (38) having electric field containing means forcing the electric field due to the electric current in the winding ...
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WO/1998/033256A1 |
An a.c. current distribution system fed by a current source for providing electrical power to a load, the current distribution system comprising a first and second conductive means connectable to the current source and coupling means to ...
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WO/1998/031024A1 |
A controllable inductor comprises at least a tubular core (13), a main winding (5) surrounding the core, a control winding (14) passing substantially axially through the core, a ground part (15) arranged inside the main winding and an el...
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WO/1998/029788A1 |
In a three-phase three-wire or four-wire auto-transformer, one set or a plurality of sets of main coils connected to an input terminal are interwound around three-phase core type cores by three circuits and a plurality of sets of excitin...
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WO/1998/029929A1 |
This invention is related to a device and a method for protection, in an electric power plant, of an object (1) against overcurrents from a network (3) or another equipment included in the high voltage plant, the device comprising a swit...
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WO/1998/027635A1 |
This invention is related to a device and a method in an electric power plant for protection of an object (1) against over-currents from a network (3) or another equipment included in the high voltage plant, the device comprising a switc...
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WO/1998/027634A1 |
This invention is related to a device and a method in an electric power plant for protection of an object (1) against over-currents from a network (3) or another equipment included in the high voltage plant, the device comprising a switc...
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WO/1998/027636A1 |
This invention is related to a device and a method for protection, in an electric power plant, of an object (1) against over-currents from a network (3) or another equipment included in the high voltage plant, the device comprising a swi...
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WO/1998/022959A1 |
The saturation choke coil of the present invention may be used for controlling the DC voltage and/or current in power rectifiers. The present invention may also provide a substantial gain in the power coefficient as well as in the harmon...
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WO/1997/045919A2 |
A rotating electric machine for direct connection to all types of high-voltage networks, in which the magnetic circuit adapted for high voltage comprises a rotor, stator and windings. The winding comprising a conductor surrounded by a so...
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WO/1997/045288A2 |
In a plant intended for driving traction motors e.g. railway locomotives or motor coaches, and which possibly comprises one or more electric machines provided with insulated conductors, the magnetic circuit in the traction motor(s) and/o...
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WO/1997/045922A1 |
The magnetic circuit of synchronous compensator plant is included in an electric machine which is directly connected to a high supply voltage of 20-800 kV, preferably higher than 36 kV. The electric machine is provided with solid insulat...
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WO/1997/045847A1 |
The present invention relates to a power transformer/reactor (14, 15, 16) for high voltages, comprising at least one winding having at least one current-carrying conductor. The winding comprises a solid insulation (7) surrounded by outer...
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WO/1997/045925A1 |
In a plant comprising one or more electric machines constructed with insulated conductors and connected for heavy current via insulated conductors, the magnetic circuit in at least one of these electric machines is connected directly to ...
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WO/1997/045921A2 |
An electromagnetic device comprises a magnetic field generating electrical circuit including a winding (1) having at least one electrical conductor (2). The winding comprises a solid insulation (4) surrounded by outer and inner layers (3...
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WO/1997/045923A1 |
The magnetic circuit of a generator in a hydro-generator plant is arranged to directly supply a high supply voltage of 20-800 kV, preferably higher than 36 kV. The generator is provided with solid insulation and its winding includes a ca...
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WO/1997/045933A2 |
In a method for reducing the influence of third harmonic voltages upon direct connection of alternating current machines (1) to a three-phase power network (5), wherein at least one winding of the machine is Y-connected and the neutral p...
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WO/1997/045848A1 |
The present invention relates to a DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding. The winding comprises at least one current-carrying conductor. Each...
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WO/1997/045926A2 |
An electric high voltage AC machine intended to be directly connected to a distribution or transmission network (16) comprises at least one winding. This winding comprises at least one current-carrying conductor, a first layer having sem...
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WO/1997/045924A1 |
In a plant containing a turbo-generator the magnetic circuit of the turbo-generator is included in an electric generator which directly supplies a high supply voltage of 20-800 kV, preferably higher than 36 kV. The insulation of the gene...
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WO/1997/045927A1 |
The present invention relates to a rotating electric high voltage machine comprising a stator (8), a rotor (7; 37; 47) and at least one winding. The machine is characterized in that said winding comprises at least one current-carrying co...
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WO/1997/045907A2 |
The present invention relates to installations for transformerless generation of HVDC and wherein the installation comprises rotating high-voltage single-winding/multiple-winding machines and converters. The single-winding/multiple-windi...
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WO/1997/045912A1 |
The present invention relates to a rotating asynchronous converter and a generator device. The converter comprises a first stator connected to a first AC network with a first frequency (f1), and a second stator connected to a second AC n...
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WO/1997/044796A1 |
A controllable inductor comprises at least a tubular core (3), a main winding (1) surrounding the core and a control winding (4) passing substantially axially through the core. It also comprises a yoke (19) of a material having a high ma...
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WO/1997/044795A1 |
A controllable inductor comprises at least a tubular core, a main winding (1) surrounding the core and a control winding (3) passing substantially axially through the core. It is adapted for connection to a three phase alternating curren...
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WO/1997/035327A1 |
A high voltage electrical apparatus (13) comprises an insulating support (14) made of a moulded first electrically insulating material and carrying rigid electrical conductors (11, 12) and a second electrically insulating material (16, 1...
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WO/1997/034161A1 |
A method for monitoring an on-load tap changer wherein the recording of sound and its conversion into a sound signal are initiated at the beginning of a connection operation of the tap changer and the sound signal is rectified, converted...
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WO/1997/029494A1 |
A parallel winding voltage-regulating apparatus includes a transformer whose voltage-regulating side consists of two parallel main windings, which are electric coupling through balancing reactor. The two main windings are tapped in the o...
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WO/1997/028545A1 |
The invention features a non-linear inductor (10) which passively varies its impedance from a very low value to a relatively high value over a very small change in current (I) to effectively accomplish current limitation with a very smal...
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WO/1997/020328A1 |
A controlled by-pass reactor is proposed in which the control coil is divided into several sections of 10 % power increments or into several identical sections. Various configurations of the primary coil and control coil sections are pro...
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WO/1997/001883A1 |
A resonance tapped transformer circuit as described in which the effective turns ratio of the transformer is dependent on the frequency of the input signal. The transformer selectively connects one or more primary coils of the transforme...
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WO/1996/024146A1 |
A device for uninterrupted voltage control with an autotransformer has a first contact member (11), with which the load section (4) of the transformer can be bridged, and a second contact member (9), with which the primary winding (2) of...
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WO/1996/018198A1 |
A D.C. reactor comprising a core structure having two opposed cores separated by a magnetic gap, to form a closed magnetic circuit; a coil wound on one or both of the cores; a pair of permanent magnets for biasing, disposed on the core s...
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WO/1996/003018A1 |
The present invention relates to an electrical power control circuit for loads such as fluorescent lighting systems. A winding (3) has a positive end (13) connected to a positive rail (1) and is tapped at a predetermined position (18) fo...
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WO/1995/033270A1 |
An electric adjuster which can arbitrarily or continuously adjust the turns ratio of a transformer so as to adjust or convert inputted AC power or AC signals arbitrarily and efficiently and output the adjusted or converted the AC power o...
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WO/1995/024724A1 |
The invention concerns a switching arrangement for load change-over switches of step switches and for selector switches, wherein two switching contacts movable in two directions are present. The first switching contact is in the form of ...
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WO/1995/024005A1 |
An apparatus for providing an electrically controllable inductor uses a first and a second magnetic core (20, 24) spaced apart from one another. A DC bias coil (22) is wound on the first magnetic core (20). An inductor coil (26) is wound...
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WO/1995/017757A1 |
Transformers with similar secondary windings are required in particular for airport navigation lights, in which groups of navigation lights are to be operated with a constant current intensity by the secondary windings. In the state of t...
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WO/1995/003617A1 |
A planar transducer consists of one or several rectangular ferrite cores with a rectangular passage through which a metallic section with a rectangular cross-section is guided, in particular to ensure the secondary regulation of a mains ...
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WO/1994/011891A1 |
The invention relates to an inductor with variable inductance based on the principle of orthogonal magnetization, that is, control of the permeability of the magnetic material with the aid of a cross-directional control field. The induct...
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WO/1994/001814A1 |
An inductive device comprised of a transformer including a core (10) of amorphous metal enhanced by a permanent magnet (13). A primary winding, including coils (11a-11d), pilots fluxes about the core (10), thereby enabling increased elec...
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WO/1994/001878A1 |
The invention relates to a tap selector for an on-load tap changer, wherein the two tap selector shafts (3, 4) are made of metallic material and placed inside the current collector rings (22). The movable contacts (6, 7) of the selector ...
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WO/1993/024943A1 |
It is the aim of the invention to produce an arrangement for easy ignition voltage generation ensuring great reliability. The pulse generator (22) is fitted with two ignition coils (2a, 2b) and a permanently-magnetised rotor (4). The rot...
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WO/1993/023861A1 |
A step switch for a step transformer (1), preferably for a cast-resin encapsulated step transformer, has one-phase identical step switch modules (3.1, 3.2, 3.3) having each all means required for switching the load and its own housing fo...
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