US 11,757,280 B2
DC current damper for a medium voltage or high voltage transformer
Thomas Schmidt, Erpel (DE); and Dietrich Bonmann, Meckenheim (DE)
Assigned to Hitachi Energy Switzerland AG, Baden (CH)
Appl. No. 17/611,947
Filed by Hitachi Energy Switzerland AG, Baden (CH)
PCT Filed May 12, 2020, PCT No. PCT/EP2020/063174
§ 371(c)(1), (2) Date Nov. 17, 2021,
PCT Pub. No. WO2020/234044, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 19175085 (EP), filed on May 17, 2019.
Prior Publication US 2022/0255315 A1, Aug. 11, 2022
Int. Cl. H02H 9/02 (2006.01)
CPC H02H 9/02 (2013.01) 18 Claims
OG exemplary drawing
 
1. A DC current damper for a medium voltage or high voltage transformer, the DC current damper comprising:
at least one pair of diodes;
wherein, the two diodes in each pair of diodes are connected in an anti-parallel configuration; and
wherein the at least one pair of diodes is configured to be connected between a connection of a medium voltage or high voltage transformer and ground potential,
wherein the DC current damper is configured to block a DC current in the range 100 mA-2 Amps.