Draw-rod bushing with sealed bottom contact
AssigneeHitachi Energy Ltd
InventorsFredrik Graas, Jesper Calpson, Alejandra Ravanal, David Emilsson, Peter Sjöberg, Zoltan Repasi
Life of this patent
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Abstract
The present disclosure relates to 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. 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.
Claims20
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.
A method of electrically connecting a contact arrangement to a conductor tube of a bushing, the method comprising:
- by means of a draw-rod running through a support tube arranged within the conductor tube, the support tube being 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, the draw-rod pulling the contact arrangement into the conductor tube, wherein the conductor 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, and pulling the contact arrangement into the conductor tube until an electrical contact of the contact arrangement electrically connects with the conductor tube and a sealing plug of the contact arrangement sealingly engages an inside wall of the conductor tube, preventing liquid from passing the sealing plug into the conductor tube;
- and
- enabling the electrical contact of the contact arrangement to be connected to electrical equipment leads.
Dependencies are inferred from the claim text.