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8154369 |
Method and device for controlling of a magnetic flux
A device for controlling a magnetic flux in an electromagnetic system, wherein the system includes magnetically connected magnetic cores, between which a volume is arranged. The volume includes a...
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8058958 |
Device and method for eliminating transformer excitation losses
The invention is a device and method for eliminating core excitation losses in a distribution transformer when the transformer is not supplying power to loads. The invention consists of sensors, a...
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8013703 |
Multi-parallel magnetic-field cancellation type transformer
A multi-parallel magnetic-filed cancellation type transformer includes a plurality of coils which generate magnetic flux during energization and a core having a plurality of magnetic leg portions...
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8013702 |
Versatile distribution transformer
A versatile distribution transformer having an electromagnetic transformer and a power electronic module is provided. A pocket having connectors electrically connected to at least one winding...
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7990242 |
Transient voltage and harmonic currents quashing (THQ) transformers, transformer winding topology, and method of making the same
Different configurations of transient voltage quashing (TQ) transformers, harmonic current quashing (HQ) transformers, and transient voltage and harmonic current quashing (THQ) transformers include...
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7969264 |
Choke device for frequency converter
A choke device for a frequency converter, comprising three windings composed of conductors wound around three substantially parallel axes (A, B, C), respectively, the windings being located...
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7969265 |
Zigzag autotransformer apparatus and methods
A transformer includes a zigzag transformer comprising first, second and third magnetic cores. The transformer further includes an auxiliary winding set comprising respective pairs of...
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7948340 |
Three-phase multi-winding device
A three-phase, multi-winding includes a core, the core including a hub and an outer shell around a perimeter of the hub. wherein the hub and the outer shell are in a fixed position with respect to...
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7880575 |
Coil bus for a transformer
A transformer having high and low voltage coils mounted to legs of a core is provided. Each low voltage coil includes conductor sheeting having opposing first and second ends and opposing first and...
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7859376 |
Zigzag autotransformer apparatus and methods
A zigzag autotransformer includes a zigzag transformer including first, second and third magnetic cores and an auxiliary winding set including respective pairs of series-connected windings on...
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7834736 |
Dry type pole-mounted transformer
A distribution transformer adapted for mounting to a utility pole. The distribution transformer includes a plurality of coil assemblies mounted to a ferromagnetic core. Each of the coil assemblies...
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7796003 |
Multi-parallel magnetic-field cancellation type transformer
A multi-parallel magnetic-filed cancellation type transformer includes a plurality of coils which generate magnetic flux during energization and a core having a plurality of magnetic leg portions...
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7772954 |
Symmetrical auto transformer wye topologies
Various embodiments of multi-phase transformers are disclosed. For example, a transformer includes primary windings, secondary windings and third windings. Primary windings, secondary windings and...
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7772953 |
Symmetrical auto transformer delta topologies
Various embodiments of multi-phase transformers are disclosed. Exemplary transformer includes primary windings, secondary windings and third windings. Primary windings, secondary windings and third...
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7692523 |
Multi-voltage power transformer for the high-voltage electricity transmission network
A multi-voltage power transformer for the high-voltage electricity transmission network, has a compact design and has different selectable voltage levels at the input and/or output.
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7646275 |
Device and method for eliminating transformer excitation losses
The invention is a device and method for eliminating core excitation losses in a distribution transformer when the transformer is not supplying power to loads. The invention consists of sensors, a...
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7633262 |
Power supply for underground and pad mounted power distribution systems
A power supply generated through a set of current transformers is disclosed. The current transformers may be removably attached to a primary power line such as a high voltage power line. The power...
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7436277 |
Power transformer
A multi-phase transformer is provided that includes a first layer having at least a first planar wire and a second planar wire and a second layer formed on the first layer and having at least a...
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7369024 |
Compact dry transformer
Compact dry transformer (1A) consisting of a magnetic material core (2) provided with a first heat sink consisting of covers (10) having cooling fins (11) on the outer surface thereof. The...
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7330095 |
Cooled multiphase choke assembly
A cooled multiphase choke assembly comprising a first coil (L1, L2, L3) for each phase (U, V, W) and a first cooling element (11), each first coil (L1, L2, L3) comprising several turns of winding,...
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7307361 |
Medium voltage power converter formed using low voltage drives
A medium voltage power converter is provided that has an input transformer adapted to connect to a multi-phase power source, multiple low voltage drives each coupled to a respective set of...
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7274280 |
Nine-phase step-up/step-down autotransformer
An irregular polygon connection of a three-phase autotransformer using only five windings per phase provides a source of nine-phase power suitable for an 18-pulse AC to DC power converter. The...
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7176779 |
Inductor arrangement
An inductor arrangement for a frequency converter or corresponding electrical apparatus, the inductor arrangement comprising an input inductor coupled to the input side of the electrical apparatus...
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7112946 |
Transformer with selectable input to output phase angle relationship
A three-input induction transformer in which the phase relationship of the power output relative to the power input is selectable/adjustable after the transformer is placed in operation in the...
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7049921 |
Auto-transformer for use with multiple pulse rectifiers
Zig-zag connected, phase shifting, auto-transformers that provides the inherent ability to block the flow of zero sequence currents that are associated with multiple-pulse rectifiers. The...
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7034647 |
Integrated magnetics for a DC-DC converter with flexible output inductor
An integrated magnetic assembly that allows the primary and secondary windings of a transformer and a separate inductor winding to be integrated on a unitary magnetic structure is disclosed. The...
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7023311 |
Overlapped superconducting inductive device
An electrical device operating on the principle of induction, such as a transformer. The device employs High Temperature Superconductors to build pancake coils having a very low height to diameter...
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6930578 |
Field adjustable phase shifting transformer
A field-adjustable phase shifting transformer apparatus for canceling harmonic currents in a three-phase alternating current (AC) power distribution system includes a primary having a plurality of...
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6924438 |
Epoxy sight bowls for use in power transformers
A cured filler-less epoxy compound formed as a rigid, three-dimensional, transparent structure, including a cylindrical sight bowl of a utility or industrial high voltage bushing. A process for...
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6844802 |
Parallel core electromagnetic device
An electromagnetic device such as a power transformer comprises at least two tubular magnetic core sections spaced apart in substantially parallel alignment. The windings of the device are...
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6831545 |
E-I or E-E transformer
With the E-I or E-E transformer, signals which are independent of each other are to be transferable simultaneously, without the signals interfering with each other. The E-I transformer has an E...
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6809620 |
Transformer core
A transformer or inductor core of magnetic material has three legs (6, 8, 10) interconnected by yokes. The core comprises loops (12, 14, 16) of wires and/or strips of magnetic material, wherein...
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6806803 |
Transformer winding
An electrical transformer is disclosed. The electrical transformer comprises a central axis, a first modular section, and a second modular section. The first modular section is positioned about the...
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6456184 |
Reduced-cost core for an electrical-power transformer
A reduced-cost core for an electrical-power transformer comprises at least a first magnetic loop and a second magnetic loop. The first and the second magnetic loops are positioned substantially...
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6326877 |
Transformer coil support structure
A winding structure for a transformer has a first support having a central axis, and a second support also having a central axis. The second support is positioned having its central axis generally...
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6208230 |
Transformer for cycloconverter
A transformer for a cycloconverter includes three single-phase transformers connected into a three-phase configuration. Each of the single-phase transformers includes a two-legged core, primary...
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6169674 |
Transformer, system and method to control harmonic distortion
Harmonic distortion in a multiple phase power system is controlled by enabling different phase relationships to be set, and changed, in the field, between the devices being energized and the power...
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6166531 |
Three phase to single phase power protection system with multiple primaries and UPS capability
This invention relates to methods of providing uninterruptible, regulated, single phase power to a critical single phase load when such power is derived from two of the phases of a polyphase power...
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6147480 |
Detection of metal disturbance
A method for tracking an object using energy fields, in the presence of interference due to introduction of an article responsive to the fields, in the vicinity of the object. One or more desired...
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6087738 |
Variable output three-phase transformer
A three-phase transformer having a variable output utilizes an auxiliary winding to minimize the number of switches or taps required to provide a plurality of output voltages. At least two output...
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5977761 |
Three-phase transformer with in phase regulating winding for the regulation of phase voltages
In the case of a three-phase transformer which, per phase (U, V, W), has a primary-side winding (UPW, VPW, WPW) and a secondary-side winding (USW, VSW, WSW), in-phase regulating windings (UL, VL,...
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5574418 |
Three-phase autotransformer with a balancing function
A three-phase autotransformer improving balance of three-phase voltages and currents. An iron core has three legs corresponding to the three phase. A common winding and/or a serial winding of each...
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5557249 |
Load balancing transformer
A three phase transformer having a pair of additional coupled windings on the secondary side of each phase, with these coupled windings properly connected in series to develop a voltage in phase...
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5537089 |
Three phase transformer with reduced harmonic currents
A transformer comprising a core, a plurality of primary coils and a plurality of secondary coils, the core having three sections arranged in a generally triangular configuration forming three...
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5455553 |
Distribution transformers
A distribution transformer has a wound magnetic core (50) of overall circular shape and rectangular cross-section with between two and four overall rectangular shape electric coils (20,30)...
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5379207 |
Controlled leakage field multi-interphase transformer employing C-shaped laminated magnetic core
A multi-interphase transformer for use in power conditioners such as cycloconverters wherein polyphase input power sources with more than six phases and requiring interphase transformers for...
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5367432 |
Instrument current transformer for power cables
An instrument current transformer for a main power cable which is composed of three power cables for three phases disposed in a power cable laying hole and three current transformer coils for the...
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5343080 |
Harmonic cancellation system
A harmonic current filtering transformer includes a three-phase input winding and at least two wye-connected three-phase output windings. The output windings are phase shifted relative to each...
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5331303 |
Power transformer for cycloconverters
A power transformer for cycloconverters comprises an iron core having three legs, nine positive group windings, nine negative group windings, and nine power supply windings. Three of the positive...
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5317299 |
Electromagnetic transformer
A summing transformer having a core structure, first primary and secondary windings wound on the core structure for establishing a rotating electromagnetic field when the first primary winding is...
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