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Patent Searching and Data


Matches 251 - 300 out of 6,649

Document Document Title
WO/2009/008765A1
The invention relates to electrical engineering, in particular to transformer production, and can be used in current-limiting devices which, during short-circuits in electric networks, make it possible to use the network breakers when th...  
WO/2008/138623A1
The invention relates to a method for influencing the magnetic coupling between two bodies (10, 12) at a distance from each other, characterized in that a controllable field displacement device (13) having a field displacement area is pl...  
WO/2008/100126A1
The invention relates to a transformer for current of controlled residual flux, formed by: a toroidal magnetic core with a central opening; a primary conductor which extends through the central opening and which is supplied with a main c...  
WO/2008/100127A1
The invention relates to a transformer for controlled electric voltage, including: a magnetic core; at least one primary winding which is supplied with a main current in order to generate a main magnetic flux on the magnetic core; at lea...  
WO/2008/073034A1
An inductor regulator (50) for controlling the active and/ or reactive power flow in a three-phase electric transmission network (30,40), which for each phase comprises a first stator winding (60a, 60b, 60c) and a second stator winding 6...  
WO2007073316A9
A device for controlling a magnetic flux in an electro- magnetic system, wherein the system comprises magnetically connected magnetic cores, between which a volume is arranged. The volume comprises a controllable magnetic flux region and...  
WO/2008/031302A1
A non-excited drum tap-changer for a transformer includes an upper pedestal (2) and a lower pedestal (3). Insulated shafts (4) are positioned around the upper pedestal (2) and the lower pedestal (3), characterized in that fixed contacts ...  
WO/2008/009349A3
A coil, in particular for electromagnetically controlled brakes or clutches, has two or more part-windings and associated taps. A first part-winding comprises a winding wire having a first diameter, and a second part-winding comprises a ...  
WO/2008/024048A1
The present invention relates to a motor drive cabinet (2) in an on-load tap-changer, comprising an electric motor drive unit and a control unit (12). The electric motor drive unit comprises an electric motor (6), a gearbox (7) and a pos...  
WO/2008/024067A1
A resistor (10) for electric high-voltage apparatus, especially for connection to a diverter switch (11) in an on-load tap changer for a high-voltage transformer. The diverter switch (11) and the resistor (10) are arranged in a housing w...  
WO/2008/020750A1
A controlled electric voltage transformer which is formed by at least one magnetic core; at least one primary winding; at least one secondary winding, such that the primary winding or the secondary winding or both windings have a series ...  
WO/2008/009349A2
A coil, in particular for electromagnetically controlled brakes or clutches, has two or more part-windings and associated taps. A first part-winding comprises a winding wire having a first diameter, and a second part-winding comprises a ...  
WO/2008/009195A1
A signal compensation method for passive signal isolators, which adds a compensation transformer in the passive signal isolator circuit, wherein a primary coil of the compensation transformer is connected to a primary or secondary coil o...  
WO/2007/140675A1
A non-excited tap-changer with shielding device for a transformer includes an upper and a lower bearing (1,2). A rotating shaft (3) passes through the upper and the lower bearing (1,2) and is connected to an insulator (5). One end of the...  
WO/2007/107872A3
A universal control and diagnostic system (10) for a transformer (12) that may be retrofit with existing control and tap-changer equipment, the system providing for remote monitoring and control of the equipment and for measuring various...  
WO/2007/135209A1
The present invention relates to a static tap changer for HT/MT and MT/LT distribution transformers based on switched thyristors, which achieves an increase in the number of output voltages of up to 50% for HT/MT transformers with linear...  
WO/2005/026860A3
A preventive maintenance tapping technique includes noting a tap position of a load tap changer and noting a duration that the tap position has been held. The duration that the tap position has been held is compared to a threshold value,...  
WO/2007/107872A2
A universal control and diagnostic system (10) for a transformer (12) that may be retrofit with existing control and tap-changer equipment, the system providing for remote monitoring and control of the equipment and for measuring various...  
WO/2007/101849A1
A hybrid on-load tap changer (70), for use in high voltage alternating current power transmission, comprises a selector (72) and a diverter (74) having two legs (80, 82) defining respective current paths. Each leg (80, 82) includes a pai...  
WO/2007/099928A1
An oscillator includes: a glass substrate (21) having fixed electrodes (23a, 23b); a second glass substrate (28) having a coil pattern (30); a silicon substrate (26) arranged between the first and the second glass substrate and having a ...  
WO/2007/073316A1
A device for controlling a magnetic flux in an electro- magnetic system, wherein the system comprises magnetically connected magnetic cores, between which a volume is arranged. The volume comprises a controllable magnetic flux region and...  
WO/2006/103268A3
The invention relates to commutation in on-load tap changers and in particular to the utilisation of arcing at the contacts of one of a pair of opposed switch elements . The invention provides a commutation circuit being connectable to a...  
WO/2007/049604A1
Disclosed is a power transmission device comprising a magnetic member (10) fixed to a first member (1), a first coil (12) provided on the first member and wound around the magnetic member, and a second coil (14) provided on a second memb...  
WO/2007/035111A1
The present invention relates to a power supply system with voltage stabilisation comprising, for each phase an autotransformer (TA, TB, TC) with a parallel winding (4, 5, 6) and a series winding (7, 8, 9), the autotransformer (TA, TB, T...  
WO/2004/025703A3
A system for electrically contacting a semiconductor wafer (22 in Fig. 1) during implanting of the wafer includes one or more pairs of closely spaced contacts located adjacent the wafer (12a and 12b in Fig 1) and a driving circuit connec...  
WO/2007/029224A1
A current limiting device (30, 40, 50, 60) comprising for each phase of an AC supply a closed magnetic core (31) of reduced volume and mass having first and second pairs of opposing limbs (32a, 32b; 33a, 33b), and at least one AC coil (3...  
WO2004064084A3
An inductor (106) with self-damping properties for use in multiple applications including for high power broadband frequency applications is provided by a coil having an input end and an output end and wound about a core (112) of magneti...  
WO/2006/120919A1
A change action monitoring device for an on-load tap changer enables adoption of a relatively simple and inexpensive torque detecting means by mitigating the requirement of the detection accuracy of the start time of a change action, ena...  
WO/2006/103268A2
The invention relates to commutation in on-load tap changers and in particular to the utilisation of arcing at the contacts of one of a pair of opposed switch elements . The invention provides a commutation circuit being connectable to a...  
WO/2006/087401A1
The invention relates to a tap changer for medium-/low-voltage transformers. The inventive changer can be used to regulate the voltage levels at the output of the medium-/low-voltage transformer as a function of the distribution line loa...  
WO/2006/068503A1
The invention comprises a device for reduction of harmonics in three-phase (supply) systems comprising nonlinear devices comprising, for each phase, a circuit element with controllable impedance, comprising a first magnetic core, a first...  
WO/2006/056040A1
The invention includes an electric alternator/motor (10) having a rotor (12), stator (20) and at least one winding (22) in the stator (20) adapted to conduct a current, the machine also having first and second magnetic circuits, one of w...  
WO/2006/055598A1
Various techniques directed to the design and construction of transformers are disclosed. In one aspect, a method according to embodiments of the present invention includes loading parameters of a transformer included in a power supply d...  
WO/2006/042778A1
The invention relates to a reactance coil, in particular for operation in a frequency converter system (1) together with an electric machine (5) and a frequency converter (2) for operating said electrical machine. The reactance coil (3) ...  
WO/2006/021597A1
The invention relates to a multi-voltage power transformer for a high-voltage electric power transmission network (Politrafo), which is of compact design and which has different selectable input and/or output voltage levels, such as to p...  
WO/2006/004527A1
The invention relates to a diverter switch with an operating member and an electric circuit. The electric circuit has a main branch (1) and a resistance branch (2) connected in parallel with the main branch (1). Each branch comprises a c...  
WO/2006/003111A1
In a variety of high power electrical devices, such as fault current limiters, a permanent magnet can be used as part of a magnetic circuit, and its inductance can be altered by passing electrical current through a coil wound around it t...  
WO/2006/001170A1
A variable inductor having a small size and low height and capable of achieving sufficient dielectric strength between maim winding wires and a control winding wire. A variable inductor (10) has a control winding wire (11), main winding ...  
WO/2005/119711A1
The invention comprises a controllable inductive device, with a first core (2), a main winding (3) and a control winding (4), where the main winding (3) and the control winding (4) are adapted to provide non-parallel magnetic fields. Sai...  
WO/2005/076293A1
The present invention relates to power supply control methods, devices and systems. In one of the embodiments, the invention is implemented by means of a transformer with a primary winding, a secondary winding SW for connection to a vari...  
WO2005034152A3
An electrical contactor (30) comprising a removable coil (32) has a contactor housing (38) including a cavity (48). A pair of fixed coil terminals (34) are mounted to the contactor housing proximate the cavity. The removable coil is remo...  
WO/2005/050341A1
The present invention relates to a voltage regulator, especially for power regulation, consisting of a toroid-core transformer (1), where its input is connected to distribution electricity network, and of control voltage source (2), wher...  
WO/2005/038831A1
A high-voltage transformer the leakage inductance of which can be accurately and easily regulated. Winding frames of a primary-side winding (6), a secondary-side winding (7), and a magnetic-coupling adjusting winding (8) are provided so ...  
WO/2005/036568A1
A controllable inductor, comprising first and second coaxial and concentric pipe elements, where said elements are connected to one another at both ends by means of magnetic end couplers, a first winding wound around both said elements, ...  
WO/2005/034160A1
A system for selecting coil voltage in an electrical device comprises a housing and a coil in the housing having a plurality of windings. Each winding has a pair of pins. A slider supports a plurality of moveable contacts and is moveably...  
WO/2005/034152A2
An electrical contactor (30) comprising a removable coil (32) has a contactor housing (38) including a cavity (48). A pair of fixed coil terminals (34) are mounted to the contactor housing proximate the cavity. The removable coil is remo...  
WO/2005/031771A1
The invention relates to an ignition coil (10) for a spark ignition engine comprising a coil core (12) in which a primary magnetic field (Hp) is inducible by means of a primary substentially reel-shaped current-carrying winding (14). The...  
WO/2005/026860A2
A preventive maintenance tapping technique includes noting a tap position of a load tap changer and noting a duration that the tap position has been held. The duration that the tap position has been held is compared to a threshold value,...  
WO/2005/022573A1
The invention relates to a method for monitoring the contamination of insulating oil in load tap changers, whereby only the latest transformer load current is measured, and the transfer of rust to be expected is determined by means of ca...  
WO/2005/015724A1
A complex resonance type converter having a sync rectifier circuit exhibits a high power conversion efficiency, while having a reduced circuit scale because of its simplified circuit arrangement and being able to be manufactured at a low...  

Matches 251 - 300 out of 6,649