A shunt reactor includes a primary winding and a steel core is. The steel core includes a bottom yoke, a top yoke, a first core limb, a second core limb, and a main limb. The first core limb, the second core limb and the main limb are arranged in parallel and in between the top yoke and the bottom yoke to form a support for a magnetic flux through the steel core. The primary winding is wound around the main limb. The shunt reactor further includes an auxiliary winding wound around the bottom yoke, top yoke, first core limb, or second core limb, and is configured to generate auxiliary power. The primary and the auxiliary windings are electrically insulated from the steel core and from each other. A cooling fan is configured to be driven by the auxiliary power generated by the auxiliary winding.

A shunt reactor includes a primary winding and a steel core is. The steel core includes a bottom yoke, a top yoke, a first core limb, a second core limb, and a main limb. The first core limb, the second core limb and the main limb are arranged in parallel and in between the top yoke and the bottom yoke to form a support for a magnetic flux through the steel core. The primary winding is wound around the main limb. The shunt reactor further includes an auxiliary winding wound around the bottom yoke, top yoke, first core limb, or second core limb, and is configured to generate auxiliary power. The primary and the auxiliary windings are electrically insulated from the steel core and from each other. A cooling fan is configured to be driven by the auxiliary power generated by the auxiliary winding.

An object is to improve a core and heat radiation properties from the coil, and to reduce the size of a transformer. In order to attain the object described above, a transformer includes a bobbin wound around with a coil, a columnar core center portion in which the bobbin is mounted, and a plurality of core leg portions joining both ends of the core center portion on the outside of the coil. The size of the core leg portion is larger than the size of the other core leg portions, and the core leg portion includes a flat outer circumferential surface approximately parallel to a surface which is tangent to an outer circumferential side surface of the coil. The transformer is disposed in a housing such that the outer circumferential surface of the core leg portion is tangent to a floor surface of the housing.

An object is to improve a core and heat radiation properties from the coil, and to reduce the size of a transformer. In order to attain the object described above, a transformer includes a bobbin wound around with a coil, a columnar core center portion in which the bobbin is mounted, and a plurality of core leg portions joining both ends of the core center portion on the outside of the coil. The size of the core leg portion is larger than the size of the other core leg portions, and the core leg portion includes a flat outer circumferential surface approximately parallel to a surface which is tangent to an outer circumferential side surface of the coil. The transformer is disposed in a housing such that the outer circumferential surface of the core leg portion is tangent to a floor surface of the housing.

A heat exchanger package for a dry-type transformer is provided. The heat exchanger package includes a package housing including an air inlet and an air outlet and adapted to fix to the dry-type transformer; and a first heat exchanger located in the package housing and between the air inlet and the air outlet, the first heat exchanger arranged at a first angle of inclination with respect to a first inner surface of the package housing.

A heat exchanger package for a dry-type transformer is provided. The heat exchanger package includes a package housing including an air inlet and an air outlet and adapted to fix to the dry-type transformer; and a first heat exchanger located in the package housing and between the air inlet and the air outlet, the first heat exchanger arranged at a first angle of inclination with respect to a first inner surface of the package housing.

A magnetic element. In some embodiments, the magnetic element includes a first electrically conductive coil, having a first annular surface and a second annular surface; a second electrically conductive coil, having a first annular surface and a second annular surface; and a spacer between the first electrically conductive coil and the second electrically conductive coil; a fluid inlet; and a fluid outlet. The spacer may have a first face, the first face being separated from the first annular surface of the first electrically conductive coil by a first gap; and a fluid path may extend from the fluid inlet to the fluid outlet through the first gap.

A magnetic element. In some embodiments, the magnetic element includes a first electrically conductive coil, having a first annular surface and a second annular surface; a second electrically conductive coil, having a first annular surface and a second annular surface; and a spacer between the first electrically conductive coil and the second electrically conductive coil; a fluid inlet; and a fluid outlet. The spacer may have a first face, the first face being separated from the first annular surface of the first electrically conductive coil by a first gap; and a fluid path may extend from the fluid inlet to the fluid outlet through the first gap.

An inductor includes a plurality of stacked core parts having aligned central openings, at least one spacer separating the core parts from one another, and a winding comprising a plurality turns wound around the stack of core parts through central openings of the core parts. The at least one spacer may include respective groups of spacers disposed between respective pairs of the core parts. In some embodiments, the at least one spacer may include a plurality of spacers disposed between first and second ones of the core parts and radially distributed in a circular pattern aligned with the first and second core parts.

An inductor includes a plurality of stacked core parts having aligned central openings, at least one spacer separating the core parts from one another, and a winding comprising a plurality turns wound around the stack of core parts through central openings of the core parts. The at least one spacer may include respective groups of spacers disposed between respective pairs of the core parts. In some embodiments, the at least one spacer may include a plurality of spacers disposed between first and second ones of the core parts and radially distributed in a circular pattern aligned with the first and second core parts.