Abstract: 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.

Abstract: An insulation member for being arranged adjacent to a transformer coil is provided. The insulation member includes a flat base including a first half and a second half defined along a symmetry plane and a plurality of discrete spacers projecting from the plane of the base. The spacers are attached to the first and second halves for allowing a cooling fluid to circulate between the coil and the flat base. The first half includes at least four zones, each zone having spacers arranged according to a predetermined orientation with respect to an orientation axis. The orientation of spacers between adjacent zones is different. The spacers at a first zone are oriented at an angle of between 120-150 degrees, in a second zone at between 80-100 degrees, in a third zone at between 30-60 degrees, and in a fourth zone between 120-150 degrees.

Abstract: 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.