A tap changer device for a transformer comprising: • an electrically discontinuous regulation winding open at least at one point such that the regulation winding is divided into at least one electrically insulated upper half-winding and lower half-winding, respectively comprising n regulating coils (32, 34, 36, 38) each of them provided with electrically accessible electric terminals, and • a main winding, wherein the tap changer device comprises, for each of the transformer phases: • a set of first solid-state switches (61a, 62a, 63a) respectively connected to the accessible terminals of the upper half-winding (42, 43, 44) of the regulation winding, free terminals of said first solid-state switches (61a, 62a, 63a) being connected to a first common point, • a set of second solid-state switches (61b, 62b, 63b) respectively connected to the accessible terminals of the lower half-winding (45, 46, 47) of the regulation winding, free terminals of said first solid-state switches (61b, 62b, 63b) being connected to a second common point, • a local control unit for each one of the transformer phases that provides trigger signals (71a, 72a, 73a, 71b, 72b, 73b) for the solid-state switches (61a, 62a, 63a, 61b, 62b, 63b), • a single central control unit that supervises and controls the set of local control units associated with the phases, which determines for each one of them the most suitable tap as a function of operating parameters and the operating setpoint, the tap changer device being characterized in that it additionally comprises: • a current sensor electrically connected between the common points (48a, 48b) that collects information regarding the current that circulates therethrough and transmits it to the local control unit, wherein the number of solid-state switches (61a, 62a, 63a, 61b, 62b, 63b) is equal to the number of electrical terminals of the regulation winding which, in turn, is equal to twice the sum of the regulating coils (32, 34, 36 38) plus one 2(n+1). • an electrically discontinuous regulation winding open at least at one point such that the regulation winding is divided into at least one electrically insulated upper half-winding and lower half-winding, respectively comprising n regulating coils (32, 34, 36, 38) each of them provided with electrically accessible electric terminals, and • a main winding, • a set of first solid-state switches (61a, 62a, 63a) respectively connected to the accessible terminals of the upper half-winding (42, 43, 44) of the regulation winding, free terminals of said first solid-state switches (61a, 62a, 63a) being connected to a first common point, • a set of second solid-state switches (61b, 62b, 63b) respectively connected to the accessible terminals of the lower half-winding (45, 46, 47) of the regulation winding, free terminals of said first solid-state switches (61b, 62b, 63b) being connected to a second common point, • a local control unit for each one of the transformer phases that provides trigger signals (71a, 72a, 73a, 71b, 72b, 73b) for the solid-state switches (61a, 62a, 63a, 61b, 62b, 63b), • a single central control unit that supervises and controls the set of local control units associated with the phases, which determines for each one of them the most suitable tap as a function of operating parameters and the operating setpoint, the tap changer device being characterized in that it additionally comprises: • a current sensor electrically connected between the common points (48a, 48b) that collects information regarding the current that circulates therethrough and transmits it to the local control unit,