A method and a system for predicting a gas content in transformer oil based on a joint model are provided and belong a field of transformer failure prediction. The method includes the following: determining a type and a time series of gas to be predicted related to a failure, processing an original series by adopting empirical mode decomposition (EMD) and local mean decomposition (LMD) for a non-stationarity characteristic of a dissolved gas concentration series in oil; performing normalization on each sub-series component, dividing a training sample and a test sample; and establishing a deep belief network (DBN) prediction model for each of the sub-series components for training, performing superposition and reconstruction on the established DBN prediction model to perform characteristic extraction and classification on multi-dimensional data of the failure, evaluating prediction performance of the prediction model through calculating an error index.

A transformer includes an outer cabinet and an inner tank. The outer cabinet includes a base configured to be installed below ground level, a housing wall configured to be installed at least partially below ground level, and a sill coupled to the housing wall and configured to be installed above ground level. The sill includes a top access opening between an interior space of the outer cabinet and an exterior of the outer cabinet. The inner tank is disposed on the base at least partially below ground level and includes an active part including a transformer circuit. The inner tank includes a plurality of terminals electrically coupled to the active part, each terminal extending from the inner tank into the interior space of the outer cabinet along a respective terminal axis that passes through the top access opening at a respective upward angle with respect to ground level.

A transformer includes an outer cabinet and an inner tank. The outer cabinet includes a base configured to be installed below ground level, a housing wall configured to be installed at least partially below ground level, and a sill coupled to the housing wall and configured to be installed above ground level. The sill includes a top access opening between an interior space of the outer cabinet and an exterior of the outer cabinet. The inner tank is disposed on the base at least partially below ground level and includes an active part including a transformer circuit. The inner tank includes a plurality of terminals electrically coupled to the active part, each terminal extending from the inner tank into the interior space of the outer cabinet along a respective terminal axis that passes through the top access opening at a respective upward angle with respect to ground level.

In at least one embodiment, the liquid circulation system comprises a rotor located within a tank, a stator having a plurality of coils outside the tank, and an exterior tank wall that is non-magnetic and that is located next to the rotor and between the rotor and the stator,
wherein an axis (R) of rotation of the rotor is in parallel with the exterior tank wall, the coils of the stator are arranged along the axis (R) of rotation of the rotor so that the rotor is configured to be rotated by the stator in a touchless manner through the exterior tank wall by means of a varying electromagnetic field driven by the stator to circulate a liquid within the tank.

In at least one embodiment, the housing part is configured to be connected to an electric component, to house an electric line, and to be filled with a liquid. The housing part comprises an electrically conductive material and has an open mounting side to be connected to the electric component. A surface-to-volume ratio of the housing part is at least 3 m-1, and a ratio of the volume and a wall rupture pressure of the housing part is at least 0.02 m3MPa-1. A corresponding electric system is operated so that, when an electric arc occurs in the housing part, the housing part absorbs a pressure rise that is led into a component tank.

In at least one embodiment, the housing part is configured to be connected to an electric component, to house an electric line, and to be filled with a liquid. The housing part comprises an electrically conductive material and has an open mounting side to be connected to the electric component. A surface-to-volume ratio of the housing part is at least 3 m-1, and a ratio of the volume and a wall rupture pressure of the housing part is at least 0.02 m3MPa-1. A corresponding electric system is operated so that, when an electric arc occurs in the housing part, the housing part absorbs a pressure rise that is led into a component tank.

An electric arrangement comprising a casing; a heat generating electric component arranged inside the casing; and a heat exchanger comprising a three dimensional lattice cell structure, the three dimensional lattice cell structure being arranged to conduct a dielectric cooling fluid from the casing at an exterior side of the casing for heat exchange with an ambient fluid, and back towards the casing for cooling of the electric component. A panel for a heat exchanger and a heat exchanger comprising a plurality of panels are also provided.

An electric arrangement comprising a casing; a heat generating electric component arranged inside the casing; and a heat exchanger comprising a three dimensional lattice cell structure, the three dimensional lattice cell structure being arranged to conduct a dielectric cooling fluid from the casing at an exterior side of the casing for heat exchange with an ambient fluid, and back towards the casing for cooling of the electric component. A panel for a heat exchanger and a heat exchanger comprising a plurality of panels are also provided.

A power transformer, including a core and a winding is provided. The core includes a limb and a yoke. The winding is wound around the limb and has an extension along a main axis of the limb. The power transformer further includes an energy harvesting device coupled to at least one of the core or the winding. The energy harvesting device includes a ferromagnetic part and a coil wound around at least a portion of the ferromagnetic part. The energy harvesting device is arranged in such a way that a part of a magnetic flux MF generated in the power transformer induces an electromotive force in the energy harvesting device. The coil includes a wire wound around a main axis of the coil and has an extension along the main axis of the coil.

A power transformer, including a core and a winding is provided. The core includes a limb and a yoke. The winding is wound around the limb and has an extension along a main axis of the limb. The power transformer further includes an energy harvesting device coupled to at least one of the core or the winding. The energy harvesting device includes a ferromagnetic part and a coil wound around at least a portion of the ferromagnetic part. The energy harvesting device is arranged in such a way that a part of a magnetic flux MF generated in the power transformer induces an electromotive force in the energy harvesting device. The coil includes a wire wound around a main axis of the coil and has an extension along the main axis of the coil.