US 12,113,449 B2
Transformer arrangement
Panagiotis Bakas, Västerås (SE); Roberto Alves, Västerås (SE); and Jan Svensson, Västerås (SE)
Assigned to HITACHI ENERGY LTD, Zürich (CH)
Appl. No. 18/553,045
Filed by HITACHI ENERGY LTD, Zürich (CH)
PCT Filed Mar. 30, 2022, PCT No. PCT/EP2022/058504
§ 371(c)(1), (2) Date Sep. 28, 2023,
PCT Pub. No. WO2022/207761, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 21166436 (EP), filed on Mar. 31, 2021.
Prior Publication US 2024/0204679 A1, Jun. 20, 2024
Int. Cl. H02M 5/257 (2006.01); H02M 1/34 (2007.01)
CPC H02M 5/257 (2013.01) [H02M 1/348 (2021.05)] 12 Claims
OG exemplary drawing
 
1. 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 used for bypassing 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 connected to a thyristor-tapped winding 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 to protect the thyristor-tapped winding from short-circuit faults of the thyristor-based AC-AC PE converter, wherein the thyristor-based AC-AC PE converter comprises one or more parallel connected and/or series connected thyristors, and wherein the impedance is a coupled impedance, wherein the coupled impedance is associated to high impedance when a magnetic flux is added when current flows from a top to a bottom terminal of the thyristor-tapped winding and vice versa, and associated to low impedance when the magnetic flux of coupled windings is subtracted when current flows from the top and the bottom terminal of the thyristor-tapped winding to a common terminal of the thyristors and vice versa.