The invention discloses a compact outdoor open-close type current transformer which comprises a transformer shell formed by butt joint of an upper half housing and a lower half housing, wherein an upper half hollow framework and a lower half hollow framework are arranged in the transformer shell, an upper half iron core is arranged in the upper half hollow framework, a lower half iron core is arranged in the lower half hollow framework, and a spring jacking piece is arranged between the upper half hollow framework and the upper half iron core; a winding wire is arranged on the lower half hollow framework, a framework baffle and a sealing gasket connected to the framework baffle are arranged at the butt joint of the upper half hollow framework and the lower half hollow framework, and the framework baffle and the sealing gasket after being connected are respectively and correspondingly embedded in a guide positioning groove arranged in the upper half housing and the lower half housing; and inner spaces of the upper half housing and the lower half housing are filled with epoxy resin, a pair of lug hole plates, and a pressing plate and bolts for connecting the lug hole plates are arranged on the transformer shell. According to the invention, the fixing reliability between a cable and the transformer is improved, and screws can be prevented from falling off during high-altitude operation.

The disclosure relates to a winding for a phase winding of a transformer. The winding includes a plurality of winding portions arranged along a coil axis. The plurality of winding portions include a first winding portion arranged at a first end of the winding and a second winding portion arranged at a second end of the winding. The winding further includes at least a third winding portion arranged along the coil axis between the first winding portion and the second winding portion. The first winding portion and the second winding portion have a first winding portion stiffness as seen along the coil axis and the at least third winding portion has a second winding portion stiffness as seen along said coil axis. The second winding portion stiffness is greater than the first winding portion stiffness. The third portion has a third portion center point on the coil axis, equidistantly spaced at a distance from the first winding portion and from the second winding portion, which third portion center point is located closer to the first end of the winding than the winding center point.

An aspect of the present disclosure provides a method for measuring a quantity of liquid in a liquid-insulated electrical component. The liquid-insulated electrical component includes a main tank and an expansion tank fluidly connected to the main tank. The method includes measuring a first pressure of the liquid at a first point in the main tank, measuring a second pressure of the liquid at a second point in the main tank, the second point being at a height above the first point, measuring a third pressure of the liquid at a third point in the expansion tank, and determining the quantity of liquid in the liquid-insulated electrical component based on the first pressure, the second pressure and the third pressure. Further aspects provide a liquid-insulated electrical component, particularly a transformer, more particularly a traction transformer for a railroad vehicle, as well as a railroad vehicle including said liquid-insulated electrical component.

A transformer oil-level monitoring and early warning system includes a plurality of transformer apparatuses and a diagnosis management platform. Each of the transformer apparatuses includes an oil-immersed transformer and an intelligent oil-level detection device. The intelligent oil-level detection device is configured to acquire status information of an insulating oil for N consecutive days, and to generate a variation relationship curve between oil level height and oil temperature of each day within the N days according to the status information and perform fitting processing. Therefore, a standard reference curve adapted to the oil-immersed transformer is generated. The diagnosis management platform is configured to, for each of the transformer apparatuses, perform the operations of determining whether the oil-immersed transformer in operation has an oil level abnormality based on the standard reference curve and, if yes, provide an early warning notification.

The invention relates to a high-voltage device (1), in particular a measuring transducer, with an encapsulating housing (2) and with at least one active component (3), which is arranged in the encapsulating housing (2). The at least one active component (3) is coated with at least one polymer (4). A method according to the invention for increasing the dielectric strength in a high-voltage device (1) involves at least one active component (3), which is arranged in an encapsulating housing (2), in particular filled with clean air (6), being coated with at least one polymer (4), in particular by shrink-fitting a shrink tube and/or by immersion-bath coating and/or by spray coating, wherein the polymer (4) is applied in particular as polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyolefin and/or an ethylenetetrafluoroethylene copolymer (ETFE).

An electrical device for connection to a high-voltage system has a tank filled with insulating fluid. The tank has at least one side wall forming a planar wall portion and a radially outwardly curved bulging/convex portion, which increases the interior volume of the tank. An active part with a core and at least one winding is arranged in the tank. A winding barrier system encloses one or more windings. The convex bulging portion has a shape that complements a portion of the winding barrier system and lies opposite it at a distance, such that the electrical device has increased dielectric strength. An additional barrier is disposed between the winding barrier system and the convex bulging portion which has a round portion, bent radially outwards and facing the convex bulging portion, and two planar flat portions, which at an axial crease respectively extend out of the round portion towards a free end.

A medium frequency transformer for a DC/DC converter includes: a core having an air gap and a coil surrounding a core section and having a plurality of windings; a medium voltage electric insulation, surrounding the coil each winding including a first and second termination and a conductor wound around a portion of the core in at least one turn between the first and second termination; a plurality of terminals provided outside the insulation, each connected to a different first termination by one of a plurality of connectors a channel extending from an outside of the insulation into and at least partially through said electric insulation, wherein the connectors extend through the channel and are insulated against one another by means of a low voltage insulation within the channel. The second terminations are connected to one another within or inside the insulation and connected to a second terminal outside of the insulation by a second connector.

The disclosure relates to a transformer arrangement comprising a transformer which comprises at least one phase winding. The phase winding has coil turns around a coil axis. The transformer arrangement further comprises a transformer tank having walls forming an enclosure in which the transformer is arranged. The enclosure contains an incompressible medium in which the transformer is immersed. A screen is arranged in the transformer tank, between the walls of the transformer tank and the at least one phase winding of the transformer. The screen has an inner, transformer-facing, surface and an outer, wall-facing, surface. The screen is further arranged distanced from the at least one phase winding. The transformer has lateral sides parallel with the coil axis. The screen has at least one lateral part aligned with the lateral sides of the transformer, and wherein the at least one lateral part of the screen circumscribes the transformer.

The disclosure relates to a winding for a phase winding of a transformer. The winding includes a plurality of winding portions arranged along a coil axis. The plurality of winding portions include a first winding portion arranged at a first end of the winding and a second winding portion arranged at a second end of the winding. The winding further includes at least a third winding portion arranged along the coil axis between the first winding portion and the second winding portion. The first winding portion and the second winding portion have a first winding portion stiffness as seen along the coil axis and the at least third winding portion has a second winding portion stiffness as seen along said coil axis. The second winding portion stiffness is greater than the first winding portion stiffness. The third portion has a third portion center point on the coil axis, equidistantly spaced at a distance from the first winding portion and from the second winding portion, which third portion center point is located closer to the first end of the winding than the winding center point.

Techniques for assessing a health of a transformer breather are provided. The transformer breather contains a desiccant and is in fluid communication with an expansion tank of a fluid-insulated transformer. A weight measurement that is dependent on a weight of the transformer breather or of a component or sub-assembly thereof is processed 7 assess the health of the transformer breather.