Static electric induction device and operating method

A static electric induction device comprising:

• a heat-generating component which is subject to electric induction, and
• a duct system configured to lead a coolant along the heat-generating component,
• wherein
• the duct system includes a plurality of cross channels and longitudinal channels, each of the longitudinal channels having a cross-sectional area and each one of the longitudinal channels being assigned to at least some of the cross channels and the assigned cross channels connect the longitudinal channels with each other,
• the duct system further includes at least one flow obstruction located in at least one of the longitudinal channels, the flow obstruction is configured to allow flow of the coolant through it and locally narrows the cross-sectional area of the at least one of the longitudinal channels by at least 75% so that a bypass for the coolant is realized,
• the heat-generating component comprises a plurality of electric conductor sections stacked one above the other along a direction of main extent of the longitudinal channels, the cross channels in each case run between adjacent ones of the electric conductor sections, and along the direction of main extent the at least one flow obstruction is thinner than the electric conductor sections,
• the heat-generating component is a transformer and the electric conductor sections are transformer windings,
• the at least one flow obstruction comprises an obstruction plate having a plurality of bypass openings configured to be passed through by the coolant, and
• the at least one flow obstruction further comprises a mounting plate that is mounted to a duct wall limiting at least one of the longitudinal channels and running in parallel with the direction of main extent, the obstruction plate and the mounting plate being manufactured from one piece of a dielectric material which is a polymeric material, wherein the at least one flow obstruction is part of an annular coolant guiding ring surrounding the heat-generating component.