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 (M) 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 (M) 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 characterised in that - the at least one flow obstruction further comprises a mounting plate running in parallel with the direction (M) of main extent, the obstruction plate and the mounting plate being manufactured from one piece of a dielectric material which is a polymeric material. - 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 (M) 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 (M) 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 characterised in that - the at least one flow obstruction further comprises a mounting plate running in parallel with the direction (M) of main extent, the obstruction plate and the mounting plate being manufactured from one piece of a dielectric material which is a polymeric material. <EOS>