A transformer arrangement comprising: a transformer having a primary side for receiving input voltage and current from a source and a secondary side for providing output voltage and current to a load; an AC-AC Power Electronic, PE, converter connected to a thyristor configured to bypass the AC-AC PE converter in case of a short-circuit fault in a terminal of the primary side and/or the secondary side ; wherein the transformer arrangement further comprises a thyristor-based AC-AC PE converter , including upper thyristors and lower thyristors having a common terminal, connected to a thyristor-tapped winding , which comprises a top terminal and a bottom terminal, and wherein the AC-AC PE converter is connected with the thyristor-tapped winding via the thyristor-based AC-AC PE converter , and wherein the thyristor-based AC-AC PE converter is connected to an impedance configured to protect the thyristor-tapped winding from short-circuit faults of the thyristor-based AC-AC PE converter ; wherein the impedance is a coupled impedance connected to the top terminal and the bottom terminal of the thyristor-tapped winding , wherein the coupled impedance is associated to high impedance when a magnetic flux is added when current flows from the top terminal to the bottom terminal of the thyristor-tapped winding and vice versa during a short-circuit fault of the thyristor-based AC-AC PE converter , and associated to low impedance when the magnetic flux is subtracted when current flows from the top terminal and the bottom terminal of the thyristor-tapped winding to the common terminal of the thyristors and vice versa during a commutation of a current between the upper and lower thyristor switches . a transformer having a primary side for receiving input voltage and current from a source and a secondary side for providing output voltage and current to a load; an AC-AC Power Electronic, PE, converter connected to a thyristor configured to bypass the AC-AC PE converter in case of a short-circuit fault in a terminal of the primary side and/or the secondary side ; wherein the transformer arrangement further comprises a thyristor-based AC-AC PE converter , including upper thyristors and lower thyristors having a common terminal, connected to a thyristor-tapped winding , which comprises a top terminal and a bottom terminal, and wherein the AC-AC PE converter is connected with the thyristor-tapped winding via the thyristor-based AC-AC PE converter , and wherein the thyristor-based AC-AC PE converter is connected to an impedance configured to protect the thyristor-tapped winding from short-circuit faults of the thyristor-based AC-AC PE converter ; wherein the impedance is a coupled impedance connected to the top terminal and the bottom terminal of the thyristor-tapped winding , wherein the coupled impedance is associated to high impedance when a magnetic flux is added when current flows from the top terminal to the bottom terminal of the thyristor-tapped winding and vice versa during a short-circuit fault of the thyristor-based AC-AC PE converter , and associated to low impedance when the magnetic flux is subtracted when current flows from the top terminal and the bottom terminal of the thyristor-tapped winding to the common terminal of the thyristors and vice versa during a commutation of a current between the upper and lower thyristor switches . <EOS>