A transformer with integrated cooling is disclosed. The transformer comprises a primary winding and a secondary winding, and a coolant line partly or completely embedded in at least one of the primary or secondary windings. The coolant line is supplied with coolant from a supply device. The coolant line has a plurality of exit holes that are arranged to lead in a direction of at least one of the primary or secondary winding, so as to supply it with coolant.

A transformer assembly for a wind turbine is described. The transformer assembly includes a liquid-filled main transformer and an auxiliary transformer connected on the high-voltage side of the main transformer. The auxiliary transformer benefits from improved power quality in this configuration.

An improved transformer arrangement of a wind turbine is provided. A wind turbine transformer arrangement comprises a transformer that is arranged in the wind turbine. The transformer comprises a housing. The transformer housing is filled with an oil. The transformer arrangement comprises at least one decompression chamber and the interior of the transformer housing is connected to the interior of the decompression chamber by a pressure release tube in a way that an increase in the pressure in the transformer housing due to a malfunction of the transformer is transferred through the pressure release tube into the decompression chamber.

A pumping system includes an electric motor, a power supply, a variable speed drive connected to the power supply, a transformer connected to the variable speed drive and a power cable connected between the transformer and the electric motor. The transformer includes a sine-wave filter that has inductors contained within an oil-filled central tank.

A soundproofing transformer includes a tank; a winding portion and a core portion provided inside the tank; an insulating fluid provided inside the tank; a reinforcing member provided outside of the tank; a cavity having a resonance space and connected to the reinforcing member by a coupling member; a partition member stacked on the cavity, and having an acoustic absorption portion; a noise inlet member having a first inlet facing the tank, connected to the resonance, and configured to transmit noise introduced from the first inlet to the resonance space; and a noise reduction panel connected to at least one of the partition member and the noise inlet member, and having a second inlet provided to communicate with the acoustic absorption portion while facing the tank.

A dielectric fluid is provided comprising an oil and one or more compounds selected from the group consisting of phosphite compounds. It has been discovered that addition of one or more compounds selected from the group consisting of phosphite compounds to dielectric fluids comprising oil impart a stabilizing effect that reduces, inhibits or prevents formation of stray gases in the dielectric fluid during ordinary use.

A dielectric fluid is provided comprising a natural bio-sourced oil and one or more compounds selected from the group consisting of phosphite compounds. It has been discovered that addition of one or more compounds selected from the group consisting of phosphite compounds to dielectric fluids comprising oil impart a stabilizing effect that reduces, inhibits or prevents formation of stray gases in the dielectric fluid during ordinary use.