A transformer includes a magnetic core, a first winding and at least one second winding. The magnetic core has a window through which the first winding passes through without contacting the magnetic core. The second winding passes through the window of the magnetic core and is wound on the magnetic core. The second winding has a distance from the first winding, and a semi-conductive part is disposed between the second winding and the magnetic core. The present disclosure can effectively lower the risk of partial discharge between the second winding and the magnetic core, and thus the transformer of the present disclosure has high reliability.

A coil component includes a support member; a coil portion including at least one of first and second coil patterns respectively disposed on one surface and the other surface of the support member; and a body embedding the support member and the coil portion, wherein at least one of the first and second coil patterns includes a second conductive layer and a first conductive layer disposed between the second conductive layer and the support member, and wherein the coil portion further includes an internal insulating wall buried in the second conductive layer.

In a current sensor coil assembly (1) comprising at least one sensor air coil (2), which sensor air coil (2) is designed as a Rogowski coil (3), wherein the current sensor coil assembly (1) has a housing (4), which housing (4) comprises the Rogowski coil (3), it is proposed that the Rogowski coil (3) is embedded in a potting compound (5), that the potting compound (5) comprises at least one first material and one second material, that the first material is an electrical insulating material, in that the second material comprises particles having predeterminable electrical conductivity, and that the potting compound (5) has a specific electric resistance between 10 .Math.cm and 6000 .Math.cm, in particular between 500 .Math.cm and 5000 .Math.cm, preferably between 2000 .Math.cm and 3000 .Math.cm.

An insulating chip includes: a first unit; and a second unit disposed on the first unit, wherein the first unit includes a first element insulation layer including a first element back surface and a first element head surface, a first insulation element embedded in the first element insulation layer, and a first connection electrode exposed from the first element back surface, the second unit includes a second element insulation layer including a second element back surface and a second element head surface, a second insulation element opposed to the first insulation element, and a second connection electrode exposed from the second element back surface, the first unit and the second unit are disposed so that the first element back surface is in contact with the second element back surface and the first connection electrode is electrically connected to the second connection electrode.

A saturation resistant electromagnetic device may include a core in which a magnetic flux is generable and an opening through the core. A spacer may be disposed within the opening and may extend through the core. The spacer may define a channel through the core. A primary conductor winding may be received in the channel of the spacer and may extend through the core. An electric current flowing through the primary conductor winding generates a magnetic field about the primary conductor winding. The magnetic field includes electromagnetic energy. The spacer may include a configuration to absorb a predetermined portion of the electromagnetic energy and a remaining portion of the electromagnetic energy is absorbed by the core to generate a magnetic flux flow in the core.

Provided are a transformer winding and a method for constructing a transformer winding. The transformer winding includes: a lead wire of a winding conductor of the transformer winding; an insulating layer wrapping the lead wire; a ground shielding layer covering a side, close to the winding conductor, of the insulating layer; and a stress grading material layer, which is made of a semi-conductive material, covers a side, away from the winding conductor, of the insulating layer, and is electrically connected to the ground shielding layer, where the stress grading material layer is impedance-matched with the insulating layer.

An inductor according to one embodiment includes a magnetic core, a case, a winding, and a resin. The case is configured to house the magnetic core. The winding is configured to be wound around the case. The resin is configured to be formed of a first resin to cover the case and the winding. A difference between an inside dimension of the case and a dimension of the magnetic core in the same direction is greater than a variation of a dimension of the case in the direction when forming the resin.

The present disclosure provides an inductor including plural cores, each of the plural cores including a center post, the plural cores separated from each other by corresponding first gaps, each of the first gaps dimensioned to enable a flux path with a value that is one-half a value of the flux through one of the center posts.

A transformer with improved insulation is provided with an electrically insulating sheet separating the primary winding and a first split-core section from the secondary winding and a second split-core section. The insulating sheet is provided with coatings and the coatings are referenced to the primary side and the secondary side windings and cores to form equipotential surfaces and distribute the dielectric stresses across the transformer. Ridges are optionally added to the insulation sheet to increase creepage and clearance distances. The features described reduce the occurrence of corona and partial discharge in the transformer structure and surrounding space.