A high-voltage winding (130) includes a winding body (1310), a high-voltage coil (1320), and a high-voltage insulating layer (1330). A wire is wound on the winding body (1310) to form the high-voltage coil (1320), and the high-voltage insulating layer (1330) is wrapped around the high-voltage coil (1320) and the winding body (1310).

The present disclosure provides an exemplary three-phase multi-tap balancing distribution transformer capable of operation with both balanced and unbalanced loads and that provides a wide range of incremental voltages to compensate for the varying voltage drops and imbalances as the attached conductor length increases and allows users the ability to incrementally and independently adjust the voltage specifically feeding a specific phase. Incremental adjustment is achieved via the transformer and without any fragile or other external devices or components between the power source and load-side equipment terminals. The transformer, through the use of at least one phase-specific tap-change switch is capable of directly controlling the secondary voltage of the applicable phase independently from the other phases and, thus, does not affect the voltage on the other phases.

A transformer and a method of manufacturing a transformer are disclosed. The transformer can include a transformer core with at least three core limbs which are arranged in parallel with respect to one another and perpendicular to corner points of an area spanned by a polygon, and wherein axial end regions of each of the at least three core limbs transition into a respective yoke segment arranged transversely with respect to the axial end regions. Main windings can be arranged around each of the at least three core limbs in a hollow-cylindrical winding region. A magnetic cross section of a respective core limb can be greater than a magnetic cross section of the respective yoke segment. Additional windings can be electrically connected to a respective main winding and can be arranged around each of the respective yoke segments.

A tunable inductor is provided including a core having a closed shape and including first through third legs. A first winding wound around the first leg is coupled to a first controller configured to provide DC power to the first winding. The first winding is configured to generate a DC flux in a DC flux path in response to the DC power, the DC flux path passing through a first magnetoelectric material coupled to the core. A second winding wound around the second leg is coupled to the first controller and is configured to generate the DC flux in response to the DC power. A third leg between the first leg and the second leg is coupled to an AC power source configured to provide AC power to the third winding. The third winding is configured to generate AC flux in an AC flux path based on the AC power.

A dry transformer load switch, and transformer having such switch, has a hollow insulation cylinder extending longitudinally about a virtual center axis and has a plurality of connection contacts arranged along the inner circumference thereof, and a radially oriented main contact arranged in the interior of the hollow insulation cylinder so as to be rotatable about the center axis and which, with a corresponding rotary movement, can be optionally electrically connected by the radially outer end thereof to one of the connection contacts. In a hollow-cylindrical space about the center axis that is defined by the radially inner and outer end of the main contact, there is a barrier shield, which can be rotated together with the main contact about the axis.

A tap changer arrangement including a tap changer housing having a longitudinal extension along a first axis, wherein the tap changer housing comprises a first interface part fixedly attachable to a support structure of a transformer tank, a second interface part at a distal part of the tap changer housing, and an intermediate housing part arranged between the first interface part and the second interface part, the first interface part, the intermediate housing part and the second interface part being arranged on the first axis. The tap changer arrangement includes a plurality of support elements that is mechanically connected to the second interface part and either mechanically connected to the first interface part or to a support structure of the transformer tank, the support elements being configured to exert a compressive force on the intermediate housing part from the first interface part and from the second interface part.

Provided is a three-phase dry-type transformer. The three-phase dry-type transformer comprises three single-phase dry-type transformers connected to each other. Each single-phase transformer comprises an incoming line side high-voltage coil and an outgoing line side high-voltage coil, wherein the incoming line side high-voltage coil is provided with an incoming line end and an outgoing line end, and the outgoing line side high-voltage coil is provided with an incoming line end and an outgoing line end. The outgoing line end of the incoming line side high-voltage coil is connected to the incoming line end of the outgoing line side high-voltage coil, such that the incoming line side high-voltage coil and the outgoing line side high-voltage coil are connected in series. Further provided is an assembly method.

A tap changer arrangement including a tap changer housing having a longitudinal extension along a first axis, wherein the tap changer housing comprises a first interface part fixedly attachable to a support structure of a transformer tank, a second interface part at a distal part of the tap changer housing, and an intermediate housing part arranged between the first interface part and the second interface part, the first interface part, the intermediate housing part and the second interface part being arranged on the first axis. The tap changer arrangement includes a plurality of support elements that is mechanically connected to the second interface part and either mechanically connected to the first interface part or to a support structure of the transformer tank, the support elements being configured to exert a compressive force on the intermediate housing part from the first interface part and from the second interface part.

A transformer assembly is presented, including a first input; a second input; a first output; a second output; a first winding including a first tap, a second tap, a third tap, and a fourth tap, a first switching device having a first input terminal, a first tap terminal coupled to the first tap, a second tap terminal coupled to the second tap, the first switching device being configured to couple the first input terminal to the first tap terminal or the second tap terminal, and a second switching device having a second input terminal, a third tap terminal coupled to the third tap, a fourth tap terminal coupled to the fourth tap, the second switching device configured to couple the second input terminal to the third tap terminal or the fourth tap terminal; and a second winding coupled to the first output and the second output.

An item of electrical equipment comprises at least one tap winding having winding taps and at least one partial winding, and a tap changer for changing a transmission ratio, an impedance or a voltage, used for excitation of the item of electrical equipment. The tap changer comprises a first module for connecting the winding taps of the at least one winding tap to one another and a second module for rapid switching-in, switching-out or bypassing of the at least one partial winding. The second module comprises at least one submodule having semiconductor switching elements, and a bypass switch.