US 12,261,421 B2
Bushing with electrically conductive head mounted on condenser core
Jan Czyzewski, Cracow (PL); Krzysztof Kasza, Cracow (PL); Jedrzej Banaszczyk, Lodz (PL); Andrzej Rybak, Cracow (PL); and Lukasz Matysiak, Cracow (PL)
Assigned to Hitachi Energy Ltd, Zürich (CH)
Appl. No. 17/798,180
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Feb. 24, 2021, PCT No. PCT/EP2021/054499
§ 371(c)(1), (2) Date Aug. 8, 2022,
PCT Pub. No. WO2021/170611, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 20158983 (EP), filed on Feb. 24, 2020.
Prior Publication US 2023/0071110 A1, Mar. 9, 2023
Int. Cl. H02G 15/103 (2006.01); H01G 4/242 (2006.01); H01G 4/32 (2006.01); H02G 15/00 (2006.01); H02G 15/04 (2006.01)
CPC H02G 15/046 (2013.01) [H01G 4/242 (2013.01); H01G 4/32 (2013.01); H02G 15/003 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A bushing having a first end and a second end, comprising:
an electrical conductor comprising a terminal at the first end of the bushing;
an electrically insulating condenser core arranged around the conductor and defining a central longitudinal through-hole through which the conductor extends;
a plurality of concentric field-grading layers arranged in the condenser core, comprising an inner field-grading layer and an outer field-grading layer;
an electrically conductive head electrically connected with the conductor passing entirely there through, forming a gas-tight cap of the first end of the bushing outside of the condenser core, sealingly engaging a circumferential lateral outer surface of the condenser core and sealingly engaging the conductor; and
an electrically conductive connection between the inner field-grading layer and the head, wherein the second end of the bushing is open to enable electrically insulating fluid to enter the central longitudinal through-hole.