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.

Embodiments of the present disclosure relate to a power equipment and method for providing the same. Embodiments of the present disclosure relate to a power equipment. The power equipment includes a high voltage part, a low voltage part, and an insulation oil adapted to impregnate the high voltage part and insulate the high voltage part from the low voltage part. The insulation oil is partially filled with polymer particles with a lower thermal expansion coefficient than the insulation oil. According to embodiments of the present disclosure, the degree of expansion of the insulation medium can be reduced in a cost-effective way

A tank for a liquid-filled shell transformer or shell reactor is disclosed. It comprises a lower tank portion with a bottom plate and side walls, and an upper tank portion with side walls. The upper and lower tank portions are joined together along a substantially horizontal perimetric joining line and define an internal space for housing an active part of the shell transformer or shell reactor and an insulating liquid. The tank further comprises a reinforcing cincture surrounding and joined to the side walls of the lower tank portion and the upper side walls of the upper tank portion and forming a sealed chamber enclosing the perimetric joining line between the lower tank portion and the upper tank portion. A shell transformer or reactor provided with such a tank is also disclosed, as well as a method for assembling a shell transformer or reactor.

A method of isolating high-voltage components from other parts of an electrical device and conveying heat from the electrical device to the environment in order to cool the electrical device, includes applying a composition containing a mixture of castor oil fatty acid methyl esters as a dielectric fluid in the electrical device.

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 (1) and an expansion tank (2) fluidly connected to the main tank (1). The method includes measuring a first pressure (P.sub.1) of the liquid at a first point in the main tank (1), measuring a second pressure (P.sub.2) of the liquid at a second point in the main tank (1), the second point being at a height (H) above the first point, measuring a third pressure (P.sub.3) of the liquid at a third point in the expansion tank (2), and determining the quantity of liquid in the liquid-insulated electrical component based, on the first pressure (P.sub.1), the second pressure (P.sub.2) and the third pressure (P.sub.3). Further aspects provide a liquid-insulated electrical component, particularly a transformer, more particularly a traction transformer (101) for a railroad vehicle (100), as well as a railroad vehicle (100) including said liquid-insulated electrical component

A transformer including a transformer tank, an expansion tank, and piping connecting the tanks enabling liquid to flow there between. The piping includes a valve configured for liquid to flow from the transformer to the expansion tank when the pressure is above a predefined first threshold and for preventing the liquid to flow from the transformer to the expansion tank when the pressure is below the first threshold. The valve is also configured for liquid to flow from the expansion to the transformer tank when the pressure is below a predefined second threshold and for preventing the liquid to flow from the expansion to the transformer tank when the pressure is above the predefined second threshold.

The use of a gas as a medium for electrically isolating and/or extinguishing electric arcs, the gas including 1-chloro-2,3,3,3-tetrafluoropropene. Also, an electrical device including a sealed chamber containing electrical components and a gas for electrically isolating and/or extinguishing electric arcs, in which the gas includes 1-chloro-2,3,3,3-tetrafluoropropene. The gas may be only 1-chloro-2,3,3,3-tetrafluoropropene.

A current converter with fluid or oil paper insulation for high voltage, with a head housing through which a primary conductor passes. A measurement device through which the primary conductor passes is arranged in the head housing. The primary conductor includes two different primary conductor types, more specifically an outer tube primary conductor as the first type and one or more inner conductor primary conductors as the second type. The outer tube primary conductor surrounds an interior that is designed to receive the inner conductor primary conductor, and the inner conductor primary conductors can be inserted into the interior. The outer tube primary conductor is used to transmit power and creates an encasement for the inner conductors. Only the outer tube primary conductor needs to be sealed with respect to the head housing. Inner conductors therefore can be easily inserted or re-moved subsequently, without the need for sealing measures.

A high-voltage transducer includes a housing, which spatially encloses at least one electrical measuring device and an insulating gas. The insulating gas is clean air, with which electrical insulation in the housing of the high-voltage transducer is carried out. A method for measuring with the high-voltage transducer is also provided.

A temperature estimation method estimating a temperature of a heat generating site in an oil-immersed electric appliance immersed in insulating oil, the insulating oil being silicone oil or ester oil. The temperature estimation method includes measuring concentrations of two types of thermal decomposition products in the insulating oil and calculating a temperature of the heat generating site in the oil-immersed electric appliance based on a concentration ratio between the two types of thermal decomposition products and a relational expression between the temperature of the heat generating site and the concentration ratio prepared in advance. When the silicone oil is adopted as the insulating oil, at least one of the two types of thermal decomposition products is straight-chain siloxane, alcohol containing silicon, or benzene. When the ester oil is adopted as the insulating oil, the two types of thermal decomposition products are fatty acids.