A hand-held, water-cooled toroidal autotransformer assembly is formed from longitudinally-oriented electrically conductive radially spaced apart concentric pipes that are physically and electrically configured in series and arranged around a longitudinally-oriented toroidal magnetic core to form the windings of the autotransformer with the spaces between the longitudinally-oriented concentric pipes forming a flow path for a cooling fluid within the autotransformer.

A hand-held, water-cooled toroidal autotransformer assembly is formed from longitudinally-oriented electrically conductive radially spaced apart concentric pipes that are physically and electrically configured in series and arranged around a longitudinally-oriented toroidal magnetic core to form the windings of the autotransformer with the spaces between the longitudinally-oriented concentric pipes forming a flow path for a cooling fluid within the autotransformer.

A cooling device for an electromagnetic interference filter is disclosed. The cooling device includes a housing. The housing includes a main body having a cavity shaped to receive the electromagnetic interference filter and one or more cooling channels surrounding at least a portion of the cavity in the main body of the housing. The one or more cooling channels define one or more flow paths that are contained completely within the housing. The housing also includes an inlet port and an outlet port. The one or more cooling channels fluidly connect the inlet port to the outlet port, and a cooling medium is configured to flow into the inlet port, through the one or more cooling channels, and exit the housing through the outlet port.

A power conversion device such that heat dissipation of an electromagnetic induction instrument can be increased, and inductance value durability and vibration resistance of the electromagnetic induction instrument is high, is provided. Also, a power conversion device reduced in size and weight is provided. A power conversion device includes an electromagnetic induction instrument wherein an upper core and a lower core having magnetism are electromagnetically coupled across a coil body, a frame body on which the electromagnetic induction instrument is mounted, a potting resin member with which a space between the frame body and the electromagnetic induction instrument is filled, and a fixing member, disposed above the electromagnetic induction instrument so as to cover the upper core, of which an end portion is attached to the frame body, wherein the electromagnetic induction instrument is fixed to the frame body by the fixing member.

A multilayer conductor includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and a second conductor sublayer separated from the first conductor sublayer by a sublayer dielectric layer. The second conductor sublayer at least partially overlaps with the first conductor sublayer in each of the plurality of conductor layers. The multilayer conductor is included, for example, in a device including a magnetic core adjacent to at least part of the multilayer conductor.

A multilayer conductor includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and a second conductor sublayer separated from the first conductor sublayer by a sublayer dielectric layer. The second conductor sublayer at least partially overlaps with the first conductor sublayer in each of the plurality of conductor layers. The multilayer conductor is included, for example, in a device including a magnetic core adjacent to at least part of the multilayer conductor.

An electrical device for connecting to a high-voltage power grid has a boiler, which is filled with an insulating fluid and in which a magnetizable core and at least one winding, which surrounds a section of the core, are arranged, and a cooling system which includes at least one radiator which is arranged outside the boiler and is connected thereto via the radiator in order to circulate the insulating fluid, wherein the radiator has at least two heat exchange elements which are connected in parallel with one another. In order to enable a cold start to be accelerated and to be carried out even at relatively low temperatures only one of the heat exchange elements has a heat-conducting connection, as a heated heat exchange element, to a heat source which generates heat when the operation of the electrical device is started.

An electrical device for connecting to a high-voltage power grid has a boiler, which is filled with an insulating fluid and in which a magnetizable core and at least one winding, which surrounds a section of the core, are arranged, and a cooling system which includes at least one radiator which is arranged outside the boiler and is connected thereto via the radiator in order to circulate the insulating fluid, wherein the radiator has at least two heat exchange elements which are connected in parallel with one another. In order to enable a cold start to be accelerated and to be carried out even at relatively low temperatures only one of the heat exchange elements has a heat-conducting connection, as a heated heat exchange element, to a heat source which generates heat when the operation of the electrical device is started.

A reactor cooling structure includes: a plurality of reactors that are stacked on one another, each reactor including a coil configured to produce magnetic flux when energized; and a cooling mechanism that cools the plurality of reactors, wherein each of the reactors has an exterior member that has: heat radiation surfaces respectively on both sides of the corresponding one of the reactors in a stacking direction of the stacked reactors i.e. a first direction, the heat radiation surfaces of the exterior member of each of the reactors being arranged to cool the coil of the corresponding one of the reactors; the cooling mechanism includes a cooling flow path for directly cooling the first and second heat radiation surfaces of the exterior member of each of the reactors by a refrigerant.

A water cooling apparatus may include: a first cooling tube including a first main body having a first internal space in which cooling water is provided, and a first connection pipe connected to the first main body, wherein the cooling water is discharged from the first internal space through the first connection pipe; a second cooling tube including a second connection pipe into which the first cooling tube is inserted so that the cooling water is provided from the first connection pipe to the second connection pipe, and a second main body connected to the second connection pipe, wherein the second main body includes a second internal space in which the cooling water drawn from the second connection pipe is provided; and a watertight gasket disposed on a circumference of the first connection pipe and made of an elastic body, wherein the first main body and the second main body may be spaced from each other with a predetermined distance.