US 12,142,392 B2
Draw-rod bushing with sealed bottom contact
Fredrik Graas, Borlänge (SE); Jesper Calpson, Ludvika (SE); Alejandra Ravanal, Smedjebacken (SE); David Emilsson, Ludvika (SE); Peter Sjöberg, Ludvika (SE); and Zoltan Repasi, Västerås (SE)
Assigned to HITACHI ENERGY LTD, Zurich (CH)
Appl. No. 17/633,338
Filed by HITACHI ENERGY LTD, Zürich (CH)
PCT Filed Nov. 20, 2020, PCT No. PCT/EP2020/082817
§ 371(c)(1), (2) Date Feb. 7, 2022,
PCT Pub. No. WO2021/099535, PCT Pub. Date May 27, 2021.
Claims priority of application No. 19210357 (EP), filed on Nov. 20, 2019.
Prior Publication US 2022/0293302 A1, Sep. 15, 2022
Int. Cl. H01B 17/30 (2006.01); H01F 27/04 (2006.01); H02G 15/04 (2006.01)
CPC H01B 17/308 (2013.01) [H01B 17/303 (2013.01); H01F 27/04 (2013.01); H02G 15/046 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A bushing comprising:
a conductor tube;
a support tube, arranged within the conductor tube;
a draw-rod configured to run through the support tube; and
a contact arrangement arranged to be drawn into the conductor tube by the draw-rod;
wherein
the support tube is fixed in relation to the conductor tube by a bottom flange, fastened to the bottom end of the support tube and to the inside of the conductor tube, and
the contact arrangement comprises an electrical contact and the contact arrangement comprises a sealing plug arranged for sealingly engaging an inside wall of the conductor tube to prevent liquid from passing the sealing plug into the conductor tube wherein the contact arrangement comprises a front guiding cone for guiding a front of the contact arrangement into a docking tube connected to an end of the support tube and wherein the docking tube comprises a conical inner surface, tapering towards the end of the support tube, for receiving the guiding cone of the contact arrangement.