An inductor for a converter of an electric machine includes a core defining a channel configured to receive transmission fluid on an outer surface of the core. Coils made of windings are wrapped on the core. The windings enclose an open side of the channel to define an oil flow passage, wherein oil flowing through the oil flow passage is in direct contact with both the windings and the core to absorb heat from the windings and the core.

An electrical device for connecting to a high-voltage network has a vessel, which is filled with an insulating fluid, an active part, which is arranged in the vessel and which has a magnetizable core and partial windings for producing a magnetic field in the core, and a cooling apparatus for cooling the insulating fluid. The electrical device can be operated at high temperatures. At least one barrier system is provided, which at least partly delimits encapsulated spaces, in each of which at least one partial winding is arranged, the barrier system guiding the insulating fluid cooled by the cooling apparatus across the encapsulated spaces in such a way that different encapsulated-space temperatures arise in the encapsulated spaces.

A first plate-like portion is provided with a plurality of first holes extending therethrough in a central axis direction. A second plate-like portion is provided with a plurality of second holes extending therethrough in the central axis direction. The plurality of first holes, the plurality of second holes, a first notch and a second notch overlap one another, to thereby form a flow path which connects one side and the other side of each of a plurality of insulating plates and through which insulating oil can flow in a first direction.

Embodiments relate to an insulation assembly for use in a transformer, a transformer assembly for use in a transformer, and a dry type transformer. The insulation assembly includes a plurality of tubular insulation barriers adapted to be arranged around a transformer inner coil to electrically isolate the inner coil from a transformer outer coil, each pair of adjacent tubular insulation barriers being separated by a gap; and an air blocking element arranged in at least one gap between the plurality of tubular insulation barriers to at least partially block an air flow from passing through the at least one gap. According to various embodiments, the air blocking element blocks the cool air from passing through the at least one gap. Thus, more cool air may pass through gas channels near to the inner/outer coils and take away more heat generated by the transformer, thereby improving the cooling efficiency of the transformer.

A toroidal magnetic element. A plurality of coils is arranged in a toroidal configuration. Each coil may be a hollow cylinder, formed by winding a rectangular wire into a roll. The coils alternate with spacers, each of which may be a wedge. The coils may alternate in winding orientation, and the inner end of each coil may be connected, through an S-Bend to the inner end of an adjacent coil. Small gaps are formed between the coils and the wedges, e.g. as a result of each wedge having, on its two faces, a plurality of raised ribs, against which the coils abut. Cooling fluid flows through the gaps to cool the coils.

A cooling structure for a transformer according to an embodiment includes a coil and a partition member. The partition member covers the coil along the axial direction on the downstream side in the flow direction of the refrigerant that flows along the axial direction parallel to the center axis of the coil.

A magnetic device includes an electrically insulating body and a conductor coil. The insulating body defines an internal cavity for a magnetic device core and a coolant channel routed about the internal cavity. The conductor coil extends through the insulating body and winds about the internal cavity. The electrically insulating body electrically insulates the internal cavity and coolant channel from the conductor coil.

A dry-type transformer coil and a method of winding a dry-type transformer coil are disclosed. An inner coil of pancake coils is separated from an outer coil of pancake coils by a first spacer block, to form a first air passage. Respective inner coils of adjacent two layers of pancake coils are separated from each other by a second spacer block, and respective outer coils of the adjacent two layers of pancake coils are separated from each other by a third spacer block, to form a second air passage. The first air passage cooperates with the second air passage, so that heat caused by operation of pancake coils can be effectively and quickly dissipated, thereby improving operational reliability of the dry-type transformer coil and increasing service life of the dry-type transformer coil. Compared with a conventional dry-type transformer coil, the voltage between layers is greatly reduced.

A dry-type transformer coil and a method of winding a dry-type transformer coil are disclosed. The dry-type transformer coil includes an inner cylinder and at least two layers of pancake coils. The pancake coils are wound around the inner cylinder sequentially along an axial direction of the inner cylinder. Each layer of pancake coils includes an inner coil and an outer coil. The inner coil is separated from the outer coil to form a first air passage, and provided with a first spacer block for separating the inner coil from the outer coil. Adjacent layers of pancake coils are separated from each other to form a second air passage, and provided with a second spacer block for separating respective inner coils of the adjacent two layers of pancake coils from each other, and a third spacer block for separating respective outer coils of the adjacent two layers of pancake coils from each other.

A winding arrangement has a number of winding sections arranged one above the other in the axial direction. The winding sections are arranged at a distance from each other and are electrically interconnected such that they form a series connection. The winding arrangement allows vertical potting with a winding insulation. At least one foot element is provided, which is connected to a winding section and is configured to carry the entire winding arrangement.